JP4014137B2 - How to prevent setscrew loosening - Google Patents

How to prevent setscrew loosening Download PDF

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JP4014137B2
JP4014137B2 JP2001394865A JP2001394865A JP4014137B2 JP 4014137 B2 JP4014137 B2 JP 4014137B2 JP 2001394865 A JP2001394865 A JP 2001394865A JP 2001394865 A JP2001394865 A JP 2001394865A JP 4014137 B2 JP4014137 B2 JP 4014137B2
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set screw
hole
screw
tightening tool
engaging
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JP2003194030A (en
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清吉 松元
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Honda Motor Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、止めネジをネジ孔内で固定する止めネジの弛み防止方法に関する。
【０００２】
【従来の技術】
従来、鋳造による製品の製造において、製品にネジ孔等となる孔部を形成するには、図５に示すように、鋳型１内に鋳抜きピン２を挿通させてキャビティ３内に突設させ、この鋳抜きピン２を鋳抜くことで、製品に孔部を形成している。このとき、鋳抜きピン２を鋳型１に固定させるため、鋳抜きピン２に対応したネジ孔４が貫通しているバックブロック５を鋳型１の外側に設け、このバックブロック５の外側からネジ孔４にスペーサピン４０を挿入した後に、止めネジ２０’，３０’を順次螺入して締結している。すなわち、ネジ孔４に第一の止めネジ２０’を締結した後に、第二の止めネジ３０’を第一の止めネジ２０’に対して締結することで、第一の止めネジ２０’と第二の止めネジ３０’を突っ張り合わせ、ネジ孔４内に固定させようとしていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来の止めネジの弛み防止方法では、止めネジ２０’と止めネジ３０’の間の締結力が十分とはいえないため、以下の問題が存在していた。
キャビティ３内に充填された高温の溶湯の熱が鋳抜きピン２及びスペーサピン４０に伝わることで、鋳抜きピン２及びスペーサピン４０が熱膨張し、鋳造後に冷却された際には縮小する。この鋳抜きピン２及びスペーサピン４０の膨張及び縮小が繰り返されることで、第一の止めネジ２０’とスペーサピン４０の間に隙間が発生する。又、溶湯を射出成形する際の圧力や振動でも隙間が発生する。すなわち、第一の止めネジ２０’の締め付け方向に隙間が発生してしまう。そして、第一の止めネジ２０’が隙間側に弛み、第一の止めネジ２０’と第二の止めネジ３０’の間の締結力が低下し、鋳型１の振動等によって止めネジ２０’，３０’に弛みが発生してしまうという問題が存在している。
【０００４】
そこで、本発明は、前記問題を解決するためになされたものであり、ネジ孔内に螺入した止めネジを確実に固定することができる止めネジの弛み防止方法を提供することを課題としている。
【０００５】
【課題を解決するための手段】
本発明は、前記課題を解決すべく構成されるものであり、止めネジであって、軸部の軸心に締付工具が貫通可能な孔部が形成され、孔部は、締付工具の係合部が係合して締付工具のトルクを伝達することが可能な係合孔部と、締付工具の係合部が空回り可能な空転孔部とを有して構成された止めネジである第二の止めネジを用いて、第一の止めネジをネジ孔内で固定する止めネジの弛み防止方法であって、第一の止めネジをネジ孔内に螺入する工程、第二の止めネジの係合孔部に締付工具の係合部を係合させて、第二の止めネジをその空転孔部側が先になるようにして、第一の止めネジと同じ方向からネジ孔に螺入する工程、第二の止めネジを第一の止めネジに向けて締め付けて第一の止めネジに圧接させる工程、締付工具の係合部を第二の止めネジの空転孔部内に移動させた後、締付工具の係合部を空転孔部内で空回りさせて、締付工具の係合部が第一の止めネジに係合可能となるように向きを変える工程、締付工具の係合部を第一の止めネジに係合させ、第一の止めネジが第二の止めネジの方向へ進むように、第一の止めネジにトルクをかける工程、の各工程により第一の止めネジをネジ孔に固定することを特徴とする。
【０００６】
この発明によれば、第一の止めネジが第二の止めネジ側へ進むようにトルクをかけることで、第一の止めネジと第二の止めネジの圧力方向が止めネジ同士の接合部に向けられるため、第一の止めネジと第二の止めネジの間の締結力を高めることができる。
【０００９】
また、第二の止めネジを螺入した後に、締付工具を空転孔部内で空回りさせて第一の止めネジに係合させることで、第二の止めネジの螺入及び第一の止めネジへのトルク付加の工程を連続して行うことができるため、作業効率を高めることができる。
【００１０】
したがって、本発明の止めネジの弛み防止方法では、ネジ孔内に螺入した２個の止めネジの間の締結力が高まり、止めネジの弛みが防止されるため、止めネジをネジ孔内で確実に固定させることができる。
【００１１】
【発明の実施の形態】
以下、添付図面を参照して、本発明の実施形態について詳細に説明する。
【００１２】
本発明の実施形態に係る止めネジの弛み防止方法は、各種のネジ孔に螺入した止めネジに適用可能であるが、この実施形態では、鋳造において製品に孔部を形成する鋳抜きピンを鋳型に固定するための止めネジに適用した場合を例として説明する。
【００１３】
図１は、本発明の実施形態に係る止めネジの弛み防止方法を適用した止めネジを示した側断面図である。図２は、本発明の実施形態に係る止めネジの弛み防止方法における各構成要素を示した図で、（ａ）は第一の止めネジを示した斜視図、（ｂ）は第二の止めネジを示した斜視図、（ｃ）は締付工具を示した斜視図である。図３は、本発明の実施形態に係る止めネジの弛み防止方法を示した図で、（ａ）は第一の止めネジの螺入工程を示した側断面図、（ｂ）は第二の止めネジの螺入工程を示した側断面図である。図４は、本発明の実施形態に係る止めネジの弛み防止方法を示した図で、（ａ）は締付工具の空転工程を示した側断面図、（ｂ）は第一の止めネジへのトルク付加工程を示した側断面図である。なお、本実施形態では、図１の左側を前方とし、右側を後方としている。
【００１４】
［鋳型の構造］
まず、本発明の実施形態に係る止めネジの弛み防止方法を適用する鋳型１は、図１に示すように、鋳型１によって形成されたキャビティ３内に溶湯を充填することで製品を射出成形するものであり、製品にネジ孔等となる孔部を形成するため、鋳型１に鋳抜きピン２を挿通させてキャビティ３内に突設させ、鋳抜きピン２を鋳抜くことで製品に孔部が形成される。なお、鋳型１は、金型や石膏型など、その材料及び構成は限定されるものではない。さらに、鋳型１の外側にはバックブロック５が設けられ、バックブロック５には鋳抜きピン２に対応する位置にネジ孔４が貫通している。このネジ孔４の内径は鋳抜きピン２の外径よりも大きく形成されており、ネジ孔４内に円柱部材であるスペーサピン４０が挿入され、スペーサピン４０の前端面４１が鋳抜きピン２に当接している。さらに、スペーサピン４０の後方からネジ孔４に第一の止めネジ２０を螺入し、スペーサピン４０の後端面４２に圧接させることで、スペーサピン４０がネジ孔４内で固定されている。これにより、スペーサピン４０と当接している鋳抜きピン２の移動が規制され、スペーサピン４０が鋳型１に固定される。したがって、第一の止めネジ２０はネジ孔４内で確実に固定される必要がある。
【００１５】
［止めネジの弛み防止方法］
次に、本発明の実施形態に係る止めネジの弛み防止方法における各構成要素を説明する。
第一の止めネジ２０は、図１及び図２（ａ）に示すように、円筒状の部材であり、軸部の全体にネジ孔４と螺合可能な雄ネジが形成され、軸心に孔部２１が形成されている。この孔部２１における軸方向の略中心から前方は正六角形の断面形状である六角孔部２２（係合孔部）であり、後方は円形の断面形状の空転孔部２３となっている。なお、空転孔部２３の内径は六角孔部２２の内径よりも大きく形成され、後記する締付工具６０の係合部６３が空回りするようになっている。
第二の止めネジ３０は、図１及び図２（ｂ）に示すように、第一の止めネジ２０と略同様の構成であり、第二の止めネジ３０の軸心に形成された孔部３１の軸方向の略中心から前方が空転孔部３３であり、後方は六角孔部３２であることのみが異なっている。
なお、第一の止めネジ２０及び第二の止めネジ３０は、鋼製や木製など、その材料は限定されるものではない。
【００１６】
また、第一の止めネジ２０及び第二の止めネジ３０にトルクをかけるための締付工具６０は、図２（ｃ）に示すように、棒状部材であるハンドル部６１の軸方向の中央に垂設されたバー６２と、その先端に係合部６３を設けたＴ型レンチである。バー部６２の先端に設けられた係合部６３は、第一の止めネジ２０及び第二の止めネジ３０の孔部２１，３１の六角孔部２２，３２に係合可能である。また、係合部６３とハンドル部６１を連結するバー部６２の外径は、係合部６３の外径よりも小さく形成されている。
【００１７】
次に、本発明の実施形態に係る止めネジの弛み防止方法について説明する。
（１）第一の止めネジの螺入工程
まず、図１に示すように、ネジ孔４内にスペーサピン４０を挿入し、スペーサピン４０の前端面４１を鋳抜きピン２に当接させる。
次に、図３（ａ）に示すように、締付工具６０の係合部６３を第１ボルト２０の六角孔部２２に係合させてトルクをかけ、第一の止めネジ２０をネジ孔４に螺入する。そして、第一の止めネジ２０の前端面２４をスペーサピン４０の後端部４２に締め付けることで圧接させ、スペーサピン４０をネジ孔４内で固定する。これにより、スペーサピン４０が当接している鋳抜きピン２が鋳型１に固定される。
【００１８】
（２）第二の止めネジの螺入工程
次に、図３（ｂ）に示すように、第二の止めネジ３０の空転孔部３３が前方になるようにして、第二の止めネジ３０の六角孔部３２に締付工具６０の係合部６３を係合させて回転させ、第二の止めネジ３０をネジ孔４に螺入する。さらに、螺入した第二の止めネジ３０を第一の止めネジ２０に向けて締め付けて第一の止めネジ２０に圧接する。
【００１９】
（３）締付工具の空転工程
次に、図４（ａ）に示すように、第二の止めネジの螺入工程後に、締付工具６０を前進させて係合部６３を各止めネジ２０，３０の空転孔部２３，３３内に移動させる。ここで、空転孔部２３，３３の内径は六角孔部３２の内径よりも大きく形成され、すなわち、締付工具６０の係合部６３の外径よりも大きく形成されている。さらに、締付工具６０のバー部６２の外径は、六角孔部３２の内径よりも小さい。したがって、バー部６２が六角孔部３２を貫通し、係合部６３が空転孔部２３，３３内に存在する状態では、係合部６３が空回りする。これにより、締付工具６０の係合部６３を空回りさせて第一の止めネジ２０の六角孔部２２に係合可能となるように向きを変え、図４（ｂ）に示すように、係合部６３を六角孔部２２に係合させる。
【００２０】
（４）第一の止めネジへのトルク付加工程
次に、図４（ｂ）に示すように、六角孔部２２に係合部６３が係合した締付工具６０によって、第一の止めネジ２０が第二の止めネジ３０の方向に進むように、第一の止めネジ２０にトルクをかける。すなわち、第一の止めネジ２０の圧力方向を止めネジ２０，３０同士の接合面５０に向ける。
【００２１】
［弛み防止作用］
前記止めネジの弛み防止方法では、第一の止めネジ２０の圧力方向と第二の止めネジ３０の圧力方向が止めネジ２０，３０同士の接合面５０に向けられているため、第一の止めネジ２０と第二の止めネジ３０の間の締結力が高まり、止めネジ２０の弛みが確実に防止される。
【００２２】
したがって、本発明の実施形態に係る止めネジの弛み防止方法では、第二の止めネジ３０の後方から第一の止めネジ２０にトルクをかけることで、第一の止めネジ２０と第二の止めネジ３０の間の締結力が高まるため、止めネジ２０の弛みが防止され、止めネジ２０，３０がネジ孔４内で確実に固定されるとともに、止めネジの弛み防止方法の作業効率が高まる。
【００２３】
以上、本発明の好適な実施形態についての一例を説明したが、本発明は前記実施形態に限定されず、本発明の趣旨を逸脱しない範囲で適宜設計変更が可能である。
例えば、第一の止めネジ２０の孔部２１に空転孔部２３を設けることなく、締付工具６０の係合部６３を第二の止めネジ３０の空転孔部３３内で空回りさせてもよい。
また、第一の止めネジ２０とスペーサピン４０若しくは鋳抜きピン２を一体に成形してもよい。
【００２４】
【発明の効果】
本発明の止めネジの弛み防止方法によれば、第一の止めネジに第二の止めネジ側へ進むようにトルクをかけることで、各止めネジの圧力方向が止めネジ同士の接合部に向けられ、各止めネジの間の締結力が高まるため、止めネジをネジ孔内で確実に固定することができる。
また、止めネジに締付工具が貫通可能な孔部を形成し、締付工具が空回り可能な空転孔部を形成した構成では、第二の止めネジの螺入及び第一の止めネジへのトルク付加の工程を連続して行うことができるため、作業効率を高めることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る止めネジの弛み防止方法を適用した止めネジを示した側断面図である。
【図２】本発明の実施形態に係る止めネジの弛み防止方法における各構成要素を示した図で、（ａ）は第一の止めネジを示した斜視図、（ｂ）は第二の止めネジを示した斜視図、（ｃ）は締付工具を示した斜視図である。
【図３】本発明の実施形態に係る止めネジの弛み防止方法を示した図で、（ａ）は第一の止めネジの螺入工程を示した側断面図、（ｂ）は第二の止めネジの螺入工程を示した側断面図である。
【図４】本発明の実施形態に係る止めネジの弛み防止方法を示した図で、（ａ）は締付工具の空転工程を示した側断面図、（ｂ）は第一の止めネジへのトルク付加工程を示した側断面図である。
【図５】従来の止めネジの弛み防止方法を適用した止めネジを示した側断面図である。
【符号の説明】
１・・・・鋳型
２・・・・鋳抜きピン
３・・・・キャビティ
４・・・・ネジ孔
５・・・・バックブロック
２０・・・・第一の止めネジ
２１・・・・孔部（第一の止めネジ）
２２・・・・空転孔部（第一の止めネジ）
２３・・・・六角孔部（第一の止めネジ）
２４・・・・前端面（第一の止めネジ）
２５・・・・後端面（第一の止めネジ）
３０・・・・第二の止めネジ
３１・・・・孔部（第二の止めネジ）
３２・・・・空転孔部（第二の止めネジ）
３３・・・・六角孔部（第二の止めネジ）
３４・・・・前端面（第二の止めネジ）
４０・・・・スペーサピン
４１・・・・前端面（スペーサピン）
４２・・・・後端面（スペーサピン）
５０・・・・接合面
６０・・・・締付工具
６１・・・・ハンドル部（締付工具）
６２・・・・バー部（締付工具）
６３・・・・係合部（締付工具）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slack limiting how set screw for fixing the set screw in the screw hole.
[0002]
[Prior art]
Conventionally, in manufacturing a product by casting, in order to form a hole portion to be a screw hole or the like in the product, a cast pin 2 is inserted into a mold 1 and protruded into a cavity 3 as shown in FIG. A hole is formed in the product by casting the cast pin 2. At this time, in order to fix the core pin 2 to the mold 1, a back block 5 through which the screw hole 4 corresponding to the core pin 2 passes is provided outside the mold 1, and the screw hole is formed from the outside of the back block 5. After the spacer pin 40 is inserted into 4, the set screws 20 ′ and 30 ′ are sequentially screwed and fastened. That is, after the first set screw 20 ′ is fastened to the screw hole 4, the second set screw 30 ′ is fastened to the first set screw 20 ′, whereby the first set screw 20 ′ and the first set screw 20 ′ are fastened. The two set screws 30 ′ were stuck together to fix them in the screw holes 4.
[0003]
[Problems to be solved by the invention]
However, in the conventional setscrew prevention method, the fastening force between the setscrew 20 ′ and the setscrew 30 ′ cannot be said to be sufficient, and the following problems exist.
When the heat of the high-temperature molten metal filled in the cavity 3 is transmitted to the core pin 2 and the spacer pin 40, the core pin 2 and the spacer pin 40 are thermally expanded and reduced when cooled after casting. By repeating the expansion and contraction of the core pin 2 and the spacer pin 40, a gap is generated between the first set screw 20 ′ and the spacer pin 40. Further, a gap is also generated by pressure or vibration when the molten metal is injection molded. That is, a gap is generated in the tightening direction of the first set screw 20 ′. Then, the first set screw 20 ′ is loosened to the gap side, the fastening force between the first set screw 20 ′ and the second set screw 30 ′ is reduced, and the set screw 20 ′, There is a problem that slack occurs at 30 '.
[0004]
The present invention has been made to solve the above problems, the object of the invention to provide a slack limiting how the set screw that can reliably fix the set screw that is screwed into the screw hole Yes.
[0005]
[Means for Solving the Problems]
The present invention is configured to solve the above-described problem, and is a set screw, and a hole portion through which the tightening tool can pass is formed in the shaft center of the shaft portion. and capable of engaging holes that engaging portion for transmitting the torque of the engaging clamping tool, Me stop the engagement portion of the tightening tool is configured to have a idle capable idle hole A method of preventing a setscrew from loosening by using a second setscrew, which is a screw, to fix the first setscrew in the screw hole, wherein the first setscrew is screwed into the screw hole, Engage the engaging part of the tightening tool with the engaging hole part of the second set screw and place the second set screw in the same direction as the first set screw so that the idling hole part side comes first. A step of screwing into the screw hole, a step of tightening the second set screw toward the first set screw and pressing the second set screw against the first set screw, After moving into the idling hole part of the female screw, rotate the engaging part of the tightening tool in the idling hole part so that the engaging part of the tightening tool can be engaged with the first set screw. A step of applying a torque to the first set screw so that the engaging portion of the tightening tool is engaged with the first set screw and the first set screw advances toward the second set screw. The first set screw is fixed to the screw hole by each of the steps.
[0006]
According to this invention, by applying torque so that the first set screw advances toward the second set screw, the pressure direction of the first set screw and the second set screw is at the joint between the set screws. Therefore, the fastening force between the first set screw and the second set screw can be increased.
[0009]
In addition , after the second set screw is screwed in, the second set screw is screwed in and the first set screw is rotated by causing the tightening tool to idle in the idle hole and engage with the first set screw. Since the process of adding torque to the can be performed continuously, the working efficiency can be increased.
[0010]
Therefore, the slack limiting how the set screw of the present invention, since the fastening force between the two set screws that screwed into the screw hole is increased, loosening the set screw is prevented, the set screw threaded holes It can be securely fixed within.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
Slack limiting how the set screw according to the embodiment of the present invention is applicable to a set screw which is screwed into a variety of screw holes, in this embodiment, punching cast to form a hole in the product in casting pin As an example, description will be given of a case where the screw is applied to a set screw for fixing to a mold.
[0013]
FIG. 1 is a side sectional view showing a set screw to which a set screw preventing method according to an embodiment of the present invention is applied. FIG. 2 is a diagram showing each component in the set screw prevention method according to the embodiment of the present invention, in which (a) is a perspective view showing a first set screw, and (b) is a second set screw. The perspective view which showed the screw | thread, (c) is the perspective view which showed the clamping tool. FIGS. 3A and 3B are diagrams showing a setscrew loosening prevention method according to an embodiment of the present invention, in which FIG. 3A is a side sectional view showing a screwing process of a first setscrew, and FIG. 3B is a second view. It is side sectional drawing which showed the screwing process of the set screw. FIGS. 4A and 4B are diagrams showing a setscrew loosening prevention method according to an embodiment of the present invention, in which FIG. 4A is a side sectional view showing an idling process of a tightening tool, and FIG. 4B is a first setscrew. It is the sectional side view which showed the torque addition process. In the present embodiment, the left side of FIG. 1 is the front and the right side is the rear.
[0014]
[Mold structure]
First, a mold 1 to which a set screw prevention method according to an embodiment of the present invention is applied, as shown in FIG. 1, a product is injection-molded by filling molten metal into a cavity 3 formed by the mold 1. In order to form a hole to be a screw hole or the like in the product, the core pin 2 is inserted into the mold 1 and protruded into the cavity 3, and the hole is formed in the product by casting the core pin 2. Is formed. The material and configuration of the mold 1 such as a mold and a plaster mold are not limited. Further, a back block 5 is provided outside the mold 1, and a screw hole 4 passes through the back block 5 at a position corresponding to the cast pin 2. The inner diameter of the screw hole 4 is formed larger than the outer diameter of the core pin 2, a spacer pin 40 that is a cylindrical member is inserted into the screw hole 4, and the front end surface 41 of the spacer pin 40 is the core pin 2. Abut. Furthermore, the spacer pin 40 is fixed in the screw hole 4 by screwing the first set screw 20 into the screw hole 4 from the rear of the spacer pin 40 and press-contacting it to the rear end face 42 of the spacer pin 40. Thereby, the movement of the core pin 2 in contact with the spacer pin 40 is restricted, and the spacer pin 40 is fixed to the mold 1. Therefore, the first set screw 20 needs to be securely fixed in the screw hole 4.
[0015]
[Preventing loosening of set screws]
Next, each component in the setscrew prevention method according to the embodiment of the present invention will be described.
As shown in FIGS. 1 and 2A, the first set screw 20 is a cylindrical member, and a male screw that can be screwed into the screw hole 4 is formed on the entire shaft portion. A hole 21 is formed. In front of the axial center of the hole 21 is a hexagonal hole 22 (engagement hole) having a regular hexagonal cross-sectional shape, and the rear is an idle hole 23 having a circular cross-sectional shape. Note that the idling hole portion 23 has an inner diameter larger than the inner diameter of the hexagonal hole portion 22 so that an engaging portion 63 of a tightening tool 60 described later runs idle.
As shown in FIG. 1 and FIG. 2B, the second set screw 30 has substantially the same configuration as the first set screw 20, and a hole formed in the axial center of the second set screw 30. The only difference is that the front is the idle hole portion 33 and the rear is the hexagonal hole portion 32 from the approximate center in the axial direction of 31.
The first set screw 20 and the second set screw 30 are not limited to materials such as steel and wood.
[0016]
Further, a tightening tool 60 for applying torque to the first set screw 20 and the second set screw 30 is provided at the center in the axial direction of the handle portion 61 which is a rod-shaped member, as shown in FIG. This is a T-type wrench provided with a suspended bar 62 and an engaging portion 63 at its tip. The engaging portion 63 provided at the tip of the bar portion 62 can be engaged with the hexagonal hole portions 22 and 32 of the hole portions 21 and 31 of the first set screw 20 and the second set screw 30. Further, the outer diameter of the bar portion 62 that connects the engaging portion 63 and the handle portion 61 is formed smaller than the outer diameter of the engaging portion 63.
[0017]
Next, a setscrew prevention method according to an embodiment of the present invention will be described.
(1) First Set Screw Screwing Step First, as shown in FIG. 1, the spacer pin 40 is inserted into the screw hole 4 and the front end face 41 of the spacer pin 40 is brought into contact with the core pin 2.
Next, as shown in FIG. 3A, the engaging portion 63 of the tightening tool 60 is engaged with the hexagonal hole portion 22 of the first bolt 20 to apply torque, and the first set screw 20 is screwed into the screw hole. Screw into 4. Then, the front end surface 24 of the first set screw 20 is brought into pressure contact with the rear end portion 42 of the spacer pin 40, and the spacer pin 40 is fixed in the screw hole 4. Thereby, the core pin 2 with which the spacer pin 40 abuts is fixed to the mold 1.
[0018]
(2) Step of screwing in the second set screw Next, as shown in FIG. 3B, the second set screw 30 is set so that the idling hole 33 of the second set screw 30 is in front. The engaging portion 63 of the tightening tool 60 is engaged with the hexagonal hole portion 32 and rotated, and the second set screw 30 is screwed into the screw hole 4. Further, the screwed second set screw 30 is tightened toward the first set screw 20 to press-contact the first set screw 20.
[0019]
(3) Idling process of tightening tool Next, as shown in FIG. 4A, after the process of screwing in the second set screw, the tightening tool 60 is advanced to engage the engaging portion 63 with each set screw 20. , 30 are moved into the idling hole portions 23, 33. Here, the inner diameters of the idle hole parts 23 and 33 are formed larger than the inner diameter of the hexagonal hole part 32, that is, larger than the outer diameter of the engaging part 63 of the tightening tool 60. Further, the outer diameter of the bar portion 62 of the tightening tool 60 is smaller than the inner diameter of the hexagonal hole portion 32. Therefore, in a state where the bar portion 62 penetrates the hexagonal hole portion 32 and the engaging portion 63 exists in the idle hole portions 23 and 33, the engaging portion 63 is idle. As a result, the engaging portion 63 of the tightening tool 60 is rotated idly so that it can be engaged with the hexagonal hole portion 22 of the first set screw 20, and as shown in FIG. The joint 63 is engaged with the hexagonal hole 22.
[0020]
(4) Step of applying torque to first set screw Next, as shown in FIG. 4B, the first set screw is tightened by the tightening tool 60 in which the engaging portion 63 is engaged with the hexagonal hole portion 22. Torque is applied to the first set screw 20 so that 20 advances in the direction of the second set screw 30. That is, the pressure direction of the first set screw 20 is directed toward the joint surface 50 between the set screws 20 and 30.
[0021]
[Anti-sagging action]
In the set screw prevention method, since the pressure direction of the first set screw 20 and the pressure direction of the second set screw 30 are directed to the joint surface 50 between the set screws 20 and 30, The fastening force between the screw 20 and the second set screw 30 is increased, and loosening of the set screw 20 is surely prevented.
[0022]
Therefore, in the set screw prevention method according to the embodiment of the present invention, the first set screw 20 and the second set screw 20 are applied by applying torque to the first set screw 20 from behind the second set screw 30. Since the fastening force between the screws 30 is increased, the set screw 20 is prevented from loosening, the set screws 20 and 30 are securely fixed in the screw hole 4, and the working efficiency of the set screw loosening prevention method is increased.
[0023]
As mentioned above, although an example about the suitable embodiment of the present invention was explained, the present invention is not limited to the above-mentioned embodiment, and design change is possible suitably in the range which does not deviate from the meaning of the present invention.
For example , the engagement portion 63 of the tightening tool 60 may be idled in the idle hole portion 33 of the second set screw 30 without providing the idle hole portion 23 in the hole portion 21 of the first set screw 20. .
Further, the first set screw 20 and the spacer pin 40 or the core pin 2 may be formed integrally.
[0024]
【The invention's effect】
According to slack limiting how the set screw of the present invention, by applying a torque to the first set screw passes to a second set screw side, the junction of the screw between stop pressure direction of the set screw Directed and the fastening force between each set screw is increased, so that the set screw can be securely fixed in the screw hole.
In addition, in the configuration in which the hole that allows the tightening tool to pass through is formed in the set screw and the idling hole that allows the tightening tool to rotate freely is formed, the second set screw is screwed in and the first set screw is inserted. Since the torque addition process can be performed continuously, the working efficiency can be increased.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a set screw to which a set screw preventing method according to an embodiment of the present invention is applied.
FIGS. 2A and 2B are diagrams showing components in the set screw prevention method according to the embodiment of the present invention, wherein FIG. 2A is a perspective view showing a first set screw, and FIG. 2B is a second set screw; The perspective view which showed the screw | thread, (c) is the perspective view which showed the clamping tool.
FIGS. 3A and 3B are views showing a setscrew loosening prevention method according to an embodiment of the present invention, in which FIG. 3A is a side sectional view showing a first setscrew screwing step, and FIG. It is side sectional drawing which showed the screwing process of the set screw.
FIGS. 4A and 4B are diagrams showing a setscrew loosening prevention method according to an embodiment of the present invention, in which FIG. 4A is a side sectional view showing an idling process of a tightening tool, and FIG. It is the sectional side view which showed the torque addition process.
FIG. 5 is a side sectional view showing a set screw to which a conventional set screw prevention method is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Cast pin 3 ... Cavity 4 ... Screw hole 5 ... Back block 20 ... First set screw 21 ... Hole Part (first set screw)
22 .. idle hole (first set screw)
23 ... Hexagonal hole (first set screw)
24 .... Front end face (first set screw)
25... Rear end face (first set screw)
30 ... Second set screw 31 ... Hole (second set screw)
32 .... Idle hole (second set screw)
33 ... Hexagonal hole (second set screw)
34 ... Front end face (second set screw)
40 ... Spacer pin 41 ... Front end face (spacer pin)
42... Rear end face (spacer pin)
50 ... Joint surface 60 ... Tightening tool 61 ... Handle part (Tightening tool)
62... Bar part (tightening tool)
63... Engaging part (clamping tool)

Claims (1)

軸部の軸心に締付工具が貫通可能な孔部が形成され、前記孔部は、前記締付工具の係合部が係合して前記締付工具のトルクを伝達することが可能な係合孔部と、前記締付工具の係合部が空回り可能な空転孔部とを有して構成された止めネジである第二の止めネジを用いて、第一の止めネジをネジ孔内で固定する止めネジの弛み防止方法であって、
前記第一の止めネジを前記ネジ孔内に螺入する工程、
前記第二の止めネジの係合孔部に前記締付工具の係合部を係合させて、前記第二の止めネジをその空転孔部側が先になるようにして、前記第一の止めネジと同じ方向から前記ネジ孔に螺入する工程、
前記第二の止めネジを前記第一の止めネジに向けて締め付けて前記第一の止めネジに圧接させる工程、
前記締付工具の係合部を前記第二の止めネジの前記空転孔部内に移動させた後、前記締付工具の係合部を前記空転孔部内で空回りさせて、前記締付工具の係合部が前記第一の止めネジに係合可能となるように向きを変える工程、
前記締付工具の係合部を前記第一の止めネジに係合させ、前記第一の止めネジが前記第二の止めネジの方向へ進むように、前記第一の止めネジにトルクをかける工程、
の各工程により前記第一の止めネジを前記ネジ孔に固定することを特徴とする止めネジの弛み防止方法。 A hole through which the tightening tool can pass is formed in the shaft center of the shaft, and the hole can be engaged with the engaging portion of the tightening tool to transmit the torque of the tightening tool. Using the second set screw, which is a set screw having an engagement hole part and an idle hole part in which the engagement part of the tightening tool can idle , the first set screw is screwed into the screw hole. A method for preventing loosening of a set screw that is fixed inside
Screwing the first set screw into the screw hole;
The engaging part of the tightening tool is engaged with the engaging hole part of the second set screw, and the first set screw is arranged so that the idling hole part side of the second set screw comes first. Screwing into the screw hole from the same direction as the screw;
Tightening the second set screw toward the first set screw to press-contact the first set screw;
After the engaging portion of the tightening tool is moved into the idling hole portion of the second set screw, the engaging portion of the tightening tool is idled in the idling hole portion to engage the tightening tool. Changing the orientation so that the mating portion is engageable with the first set screw;
Engage the engaging part of the tightening tool with the first set screw, and torque the first set screw so that the first set screw advances in the direction of the second set screw. Process,
A method for preventing loosening of a set screw, wherein the first set screw is fixed to the screw hole by each of the steps.
JP2001394865A 2001-12-26 2001-12-26 How to prevent setscrew loosening Expired - Fee Related JP4014137B2 (en)

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JP2013257019A (en) * 2012-06-14 2013-12-26 Nihon Medi Physics Co Ltd Set screw with through-hole
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