JP4418899B2 - Locking nut - Google Patents

Locking nut Download PDF

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JP4418899B2
JP4418899B2 JP2005162339A JP2005162339A JP4418899B2 JP 4418899 B2 JP4418899 B2 JP 4418899B2 JP 2005162339 A JP2005162339 A JP 2005162339A JP 2005162339 A JP2005162339 A JP 2005162339A JP 4418899 B2 JP4418899 B2 JP 4418899B2
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nut
female screw
screw portion
diameter female
small
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JP2006336755A (en
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秀夫 角谷
繁雄 木村
幸広 阿部
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OSAKAPREFECTURAL GOVERNMENT
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Description

本発明は、締め付けボルト等に使用される緩み止めナットに関する。   The present invention relates to a locking nut used for a fastening bolt or the like.

緩み止めナットとしては、プリベリングトルク形ナットやロッキング形ナット等の、ナットの戻り回転に対する抵抗を高めた抵抗増大方式のものが一般的に知られている。   As the locking nut, there is generally known a resistance increasing type that increases resistance against the return rotation of the nut, such as a pre-leveling torque nut or a locking nut.

プリベリングトルク形ナットは、最初から雄ねじと雌ねじとの間に干渉を与えて抵抗を増大させるものであるが、ナットを締め付けることにより雄ねじと雌ねじとの間に干渉を与えるロッキング形ナットに比べて、大きな抵抗力を得ることができず、緩み止め効果には限界があった。また、ロッキング形ナットの代表例であるダブルナットは、確実な締め付け作業をするには、トルク管理等に高度な技術が必要である。   Preveling torque type nuts increase the resistance by causing interference between the male screw and the female screw from the beginning, but compared with the locking type nut that causes interference between the male screw and the female screw by tightening the nut. A large resistance could not be obtained, and there was a limit to the loosening prevention effect. In addition, a double nut, which is a representative example of a locking nut, requires advanced technology for torque management and the like in order to perform a reliable tightening operation.

このため、締め付け作業を容易にする構成として、図4に示すような緩み止めナット91が知られている。この緩み止めナット91は、互いに対向する嵌合部を有しボルト92に上下2段に螺合する上ナット部94と下ナット部95とからなり、上ナット部94+の嵌合部は軸心がねじ穴心と一致する円錐穴状に形成され、かつ、下ナット部95の嵌合部は軸心がねじ穴心に対し偏心して配置された円錐台状に形成されている。   For this reason, a locking nut 91 as shown in FIG. 4 is known as a configuration that facilitates the tightening operation. The locking nut 91 includes an upper nut portion 94 and a lower nut portion 95 that have fitting portions opposed to each other and are screwed into the bolt 92 in two upper and lower stages, and the fitting portion of the upper nut portion 94+ is a shaft center. Is formed in a conical hole shape that coincides with the screw hole center, and the fitting portion of the lower nut portion 95 is formed in a truncated cone shape in which the shaft center is arranged eccentrically with respect to the screw hole center.

しかし、この締結具91は、上ナット部94と下ナット部95とが互いに分離しており、締め付け作業をする場合には、下ナット部95をボルト92にねじ込んだ後に、さらに、上ナット部94をボルト92にねじ込む必要があるので、締め付け作業が煩雑であり、部品の管理にも煩わしさがあった。   However, in this fastener 91, the upper nut portion 94 and the lower nut portion 95 are separated from each other, and when tightening, the lower nut portion 95 is screwed into the bolt 92 and then the upper nut portion. Since it is necessary to screw 94 into the bolt 92, the tightening work is complicated, and the management of the parts is also troublesome.

本発明は、上記問題を解決するためになされたものであって、容易に締め付け作業をすることができ、かつ、優れた緩み止め効果を得ることができる緩み止めナットの提供を目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a locking nut that can be easily tightened and can provide an excellent locking effect.

本発明の前記目的は、内周面の一方側に小径雌ねじ部が形成され、他方側に前記小径雌ねじ部よりも径が大きい大径雌ねじ部が形成された上ナットと、前記大径雌ねじ部に螺入される下ナットと、前記小径雌ねじ部に螺入される中ナットとを備え、前記上ナットは、前記小径雌ねじ部及び大径雌ねじ部のピッチが互いに相違するように形成されており、前記下ナット及び中ナットは、係合手段を介して互いに係合することにより、相対的な回転が規制された状態で軸心が一致するように配置され、それぞれの内周面にボルトが螺合される雌ねじ部を有する緩み止めナットにより達成される。   The object of the present invention is to provide an upper nut in which a small-diameter female screw portion is formed on one side of the inner peripheral surface and a large-diameter female screw portion having a larger diameter than the small-diameter female screw portion is formed on the other side, and the large-diameter female screw portion A lower nut and a middle nut screwed into the small-diameter female screw portion, and the upper nut is formed such that pitches of the small-diameter female screw portion and the large-diameter female screw portion are different from each other. The lower nut and the middle nut are arranged so that their axial centers coincide with each other through engagement means, and the relative rotation is restricted, and bolts are arranged on the respective inner peripheral surfaces. This is achieved by a locking nut having an internally threaded portion that is screwed together.

この緩み止めナットにおいて、前記上ナットは、前記小径雌ねじ部のピッチが、前記大径雌ねじ部のピッチよりも大きくなるように形成することができる。   In this locking nut, the upper nut can be formed such that the pitch of the small-diameter female screw portion is larger than the pitch of the large-diameter female screw portion.

前記上ナットにおける前記小径雌ねじ部及び大径雌ねじ部の螺旋方向は、前記下ナット及び中ナットの内周面における前記雌ねじ部の螺旋方向と反対方向であることが好ましい。   The spiral direction of the small-diameter female screw portion and the large-diameter female screw portion in the upper nut is preferably opposite to the spiral direction of the female screw portion on the inner peripheral surfaces of the lower nut and the intermediate nut.

また、前記係合部は、前記下ナット及び中ナットのいずれか一方に設けられた突部と、他方に形成された切欠部とから構成することができる。この場合、前記切欠部の底面にスペーサを設けることが好ましい。   Moreover, the said engaging part can be comprised from the protrusion provided in any one of the said lower nut and the inside nut, and the notch part formed in the other. In this case, it is preferable to provide a spacer on the bottom surface of the notch.

また、前記上ナット及び下ナットは、外周面に把持部を有することが好ましい。   Moreover, it is preferable that the said upper nut and a lower nut have a holding part in an outer peripheral surface.

本発明に係る緩み止めナットよれば、容易に締め付け作業をすることができ、かつ、優れた緩み止め効果を得ることができる。   According to the locking nut according to the present invention, it is possible to easily perform a tightening operation and to obtain an excellent locking effect.

以下、本発明の実態形態について添付図面を参照して説明する。図1は、本発明の一実施形態に係る緩み止めナット1の側面断面図である。   Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side sectional view of a locking nut 1 according to an embodiment of the present invention.

この緩み止めナット1は、上ナット10、下ナット20及び中ナット30を備えている。これらの材質は、普通鋼、ステンレス鋼、高張力鋼、非鉄金属などから適宜選択することができる。   The locking nut 1 includes an upper nut 10, a lower nut 20, and an intermediate nut 30. These materials can be appropriately selected from ordinary steel, stainless steel, high-tensile steel, non-ferrous metal, and the like.

上ナット10は、外周面の一方側に上側把持部18が所定の二面幅で形成されている。上ナット10の内周面には、一方側に小径雌ねじ部10aが、他方側に小径雌ねじ部10aよりも径が大きい大径雌ねじ部10bが、それぞれ形成されており、両者の間には段差からなるストッパー19が形成されている。小径雌ねじ部10a及び大径雌ねじ部10bは、ねじの螺旋方向が同一であり、本実施形態では左ねじとしている。また、小径雌ねじ部10aのピッチは、大径雌ねじ部10bのピッチと相違しており、本実施形態においては、小径雌ねじ部10aのピッチの方が大きくなるように形成されている。   The upper nut 10 is formed with an upper gripping portion 18 having a predetermined two-surface width on one side of the outer peripheral surface. On the inner peripheral surface of the upper nut 10, a small-diameter female screw portion 10a is formed on one side, and a large-diameter female screw portion 10b having a diameter larger than that of the small-diameter female screw portion 10a is formed on the other side. The stopper 19 which consists of is formed. The small-diameter female screw portion 10a and the large-diameter female screw portion 10b have the same screw spiral direction, and are left-handed in this embodiment. Further, the pitch of the small-diameter female screw portion 10a is different from the pitch of the large-diameter female screw portion 10b, and in this embodiment, the pitch of the small-diameter female screw portion 10a is formed to be larger.

下ナット20は、内周面に雌ねじ部25が形成されている。この雌ねじ部25の螺旋方向は、上ナット10における小径雌ねじ部10a及び大径雌ねじ部10bの螺旋方向とは反対方向であり、本実施形態では右ねじである。下ナット20の外周面の一方側には、上ナット10の大径雌ねじ部10bに同ピッチで螺入される雄ねじ部26が形成されている。また、下ナット20の外周面の他方側には、上ナット10の上側把持部18と略同一の二面幅で形成された下側把持部27が形成されている。   As for the lower nut 20, the internal thread part 25 is formed in the internal peripheral surface. The spiral direction of the female screw portion 25 is opposite to the spiral direction of the small-diameter female screw portion 10a and the large-diameter female screw portion 10b in the upper nut 10, and is a right-hand screw in this embodiment. On one side of the outer peripheral surface of the lower nut 20, a male screw portion 26 that is screwed into the large-diameter female screw portion 10b of the upper nut 10 at the same pitch is formed. Further, on the other side of the outer peripheral surface of the lower nut 20, a lower gripping portion 27 formed with a substantially two-surface width as the upper gripping portion 18 of the upper nut 10 is formed.

下ナット20の一方側端面には、後述する突部32と係合する切欠部22が形成されており、切欠部22の底面にスペーサー23が設けられている。スペーサー23は、例えばエポキシ樹脂系などの接着剤を塗布して硬化させることにより、形成することができる。   A cutout portion 22 that engages with a protrusion 32 described later is formed on one end face of the lower nut 20, and a spacer 23 is provided on the bottom surface of the cutout portion 22. The spacer 23 can be formed by applying and curing an adhesive such as an epoxy resin.

中ナット30は、下ナット20の雌ねじ部25と同一の径及びピッチを有する雌ねじ部35が内周面に形成されており、これら雌ねじ部25,35には、ボルト100が同ピッチで螺入される。中ナット30の外周面には、上ナット10の小径雌ねじ部10aに同ピッチで螺入される雄ねじ部36が形成されている。中ナット30の下端部には、下ナット20の切欠部22に係合する突部32が、軸方向に突出して設けられており、これら切欠部22及び突部32により係合部が構成されている。   The inner nut 30 is formed with an inner thread surface 35 having the same diameter and pitch as the inner thread portion 25 of the lower nut 20. Bolts 100 are screwed into the inner thread portions 25 and 35 at the same pitch. Is done. A male screw portion 36 is formed on the outer peripheral surface of the intermediate nut 30 and is screwed into the small diameter female screw portion 10a of the upper nut 10 at the same pitch. A projecting portion 32 that engages with the notched portion 22 of the lower nut 20 is provided at the lower end portion of the intermediate nut 30 so as to protrude in the axial direction, and the notched portion 22 and the projecting portion 32 constitute an engaging portion. ing.

上述した上ナット10、下ナット20及び中ナット30は、以下のようにして組み立てられる。   The above-described upper nut 10, lower nut 20, and middle nut 30 are assembled as follows.

まず、中ナット30と下ナット20とを、突部32と切欠部22とが係合するように重ね合わせた後、上ナット10の小径雌ねじ部10a及び大径雌ねじ部10bを、それぞれ中ナット30の雄ねじ部36及び下ナット20の雄ねじ部26にねじ込んでゆく。中ナット30及び下ナット20は、突部32及び切欠部22によって回転が相互に規制されており、また、小径雌ねじ部10aのピッチが大径雌ねじ部10bのピッチより大きいため、上ナット10がねじ込まれるに従い、中ナット30と下ナット20との間隔が徐々に拡がっていく。例えば、小径雌ねじ部10aのピッチと大径雌ねじ部10bのピッチが、それぞれ1.5mm及び1mmである場合、上ナット10が1回転したときに、中ナット30及び下ナット20は、それぞれ、上ナット10に対して相対的に1.5mm及び1mm移動する。これにより、中ナット30と下ナット20との距離dは、両者の移動量の差分(0.5mm)だけ拡がる。   First, the intermediate nut 30 and the lower nut 20 are overlapped so that the protrusion 32 and the notch 22 are engaged, and then the small-diameter female screw portion 10a and the large-diameter female screw portion 10b of the upper nut 10 are respectively connected to the intermediate nut. The screw 30 is screwed into the male screw portion 36 and the male screw portion 26 of the lower nut 20. The rotation of the middle nut 30 and the lower nut 20 is mutually restricted by the protrusion 32 and the notch 22, and the pitch of the small-diameter female screw portion 10a is larger than the pitch of the large-diameter female screw portion 10b. As the screw is screwed in, the distance between the middle nut 30 and the lower nut 20 gradually increases. For example, when the pitch of the small-diameter female screw portion 10a and the pitch of the large-diameter female screw portion 10b are 1.5 mm and 1 mm, respectively, when the upper nut 10 rotates once, the middle nut 30 and the lower nut 20 It moves 1.5 mm and 1 mm relative to the nut 10. As a result, the distance d between the middle nut 30 and the lower nut 20 increases by the difference (0.5 mm) in the amount of movement between the two.

こうして、ストッパー19が下ナット20の上端に当接するまで上ナット10をねじ込むことにより、上ナット10、下ナット20及び中ナット30が一体化された緩み止めナット1が組み上がる。このように、本実施形態の緩み止めナット1は、上ナット10、下ナット20及び中ナット30が一体化された単一の部品として取り扱うことができるので、締め付け作業や部品の管理を容易に行うことができる。   Thus, by screwing the upper nut 10 until the stopper 19 comes into contact with the upper end of the lower nut 20, the locking nut 1 in which the upper nut 10, the lower nut 20, and the middle nut 30 are integrated is assembled. As described above, the locking nut 1 of the present embodiment can be handled as a single component in which the upper nut 10, the lower nut 20, and the intermediate nut 30 are integrated. It can be carried out.

その後、切欠部22の下面に接着剤を塗布して硬化させることにより、スペーサー23を形成する。このように、スペーサ23を形成することにより、上ナット10を逆方向に回転させても、下ナット20及び中ナット30が接触した元の状態には戻らないため、上ナット10、下ナット20及び中ナット30が不意に分離するのを防止することができる。   Then, the spacer 23 is formed by applying an adhesive to the lower surface of the notch 22 and curing it. Thus, by forming the spacer 23, even if the upper nut 10 is rotated in the reverse direction, the lower nut 20 and the intermediate nut 30 do not return to the original contact state. And it can prevent that the inside nut 30 isolate | separates unexpectedly.

次に、以上のように構成された緩み止めナット1を用いて締め付け作業を行う方法を説明する。   Next, a method for performing a tightening operation using the locking nut 1 configured as described above will be described.

まず、図1に示す構成の緩み止めナット1を、図2に示すように、被締結部材105のボルト孔110に挿入されたボルト100に下ナット20側からねじ込み、下側把持部27をトルクレンチ等で右へ回しながら締め付けてゆく。これにより、下ナット20及び中ナット30がボルト100にねじ込まれる。こうして、下ナット20が被締結部材105に接触するまで締め込み、所定のトルクで締め付ける。   First, the locking nut 1 configured as shown in FIG. 1 is screwed into the bolt 100 inserted into the bolt hole 110 of the fastened member 105 from the lower nut 20 side as shown in FIG. Tighten while turning clockwise with a wrench. As a result, the lower nut 20 and the middle nut 30 are screwed into the bolt 100. Thus, the lower nut 20 is tightened until it comes into contact with the fastened member 105, and is tightened with a predetermined torque.

次に、上側把持部18をトルクレンチ等で右へ回してゆく。上ナット10は、内周面が左ねじなので、右へ回転すると、中ナット30及び下ナット20に対して相対的に上方へ移動する。上述したように、小径雌ねじ部10aのピッチが大径雌ねじ部10bのピッチよりも大きいため、上ナット10の回転に伴い、中ナット30と下ナット20との距離dが徐々に小さくなる。この結果、ボルト100の螺合部分は、中ナット30から矢示A方向の押圧力を受ける一方、下ナット20からは矢示B方向の押圧力を受けているので、ボルト100に対して圧縮方向の力が作用することになる(図3)。こうして、上ナット10の締め付けを所定のトルクで行うことにより、ボルト100と緩み止めナット1との間に十分なロッキング力が作用し、優れた緩み止め効果を得ることができる。   Next, the upper gripping portion 18 is turned clockwise with a torque wrench or the like. Since the inner peripheral surface of the upper nut 10 is a left-hand thread, the upper nut 10 moves upward relative to the middle nut 30 and the lower nut 20 when rotated to the right. As described above, since the pitch of the small-diameter female screw portion 10a is larger than the pitch of the large-diameter female screw portion 10b, the distance d between the middle nut 30 and the lower nut 20 gradually decreases as the upper nut 10 rotates. As a result, the screwed portion of the bolt 100 receives a pressing force in the direction indicated by the arrow A from the middle nut 30, and receives a pressing force in the direction indicated by the arrow B from the lower nut 20. Directional force will act (FIG. 3). Thus, by tightening the upper nut 10 with a predetermined torque, a sufficient locking force acts between the bolt 100 and the locking nut 1 and an excellent locking effect can be obtained.

また、本実施形態のように、上ナット10における小径雌ねじ部10a及び大径雌ねじ部10bの螺旋方向に対して、下ナット20及び中ナット30における雌ねじ部25,35の螺旋方向を逆方向とすることにより、下ナット20の締め付け方向と、上ナット10の締め付け方向とを一致させることができ、締め付け作業を容易にすることができる。   Further, as in the present embodiment, the spiral direction of the female screw portions 25 and 35 in the lower nut 20 and the intermediate nut 30 is opposite to the spiral direction of the small-diameter female screw portion 10a and the large-diameter female screw portion 10b in the upper nut 10. By doing so, the tightening direction of the lower nut 20 and the tightening direction of the upper nut 10 can be matched, and the tightening operation can be facilitated.

緩み止めナット1をボルト100から取り外す場合には、上述した締め付け作業とは反対の手順を行う。すなわち、上ナット10を、ストッパー19が下ナット20に当接するまで左へ回し、下ナット20及び中ナット30によるボルト100に対するロッキング力を解除した後、下ナット20を左へ回していくことにより、緩み止めナット1をボルト100から取り外すことができる。   When removing the locking nut 1 from the bolt 100, the procedure opposite to the tightening operation described above is performed. That is, the upper nut 10 is rotated counterclockwise until the stopper 19 comes into contact with the lower nut 20, the locking force applied to the bolt 100 by the lower nut 20 and the intermediate nut 30 is released, and then the lower nut 20 is rotated counterclockwise. The locking nut 1 can be removed from the bolt 100.

以上、本発明の一実施形態について詳述したが、本発明の具体的な態様は上記実施形態に限定されない。例えば、本実施形態においては、上ナット10において、小径雌ねじ部10aのピッチが、大径雌ねじ部10bのピッチより大きくなるように形成されているが、小径雌ねじ部10aのピッチが、大径雌ねじ部10bのピッチより小さくなるように形成されていてもよい。この構成においては、上ナット10の締め付けにより、下ナット20と中ナット30との間隔が拡がるように作用するため、ボルト100に対して引張方向の力が作用する。したがって、この場合でもボルト100と緩み止めナット1との間に十分なロッキング力を作用させることができる。   As mentioned above, although one Embodiment of this invention was explained in full detail, the specific aspect of this invention is not limited to the said embodiment. For example, in the present embodiment, the upper nut 10 is formed such that the pitch of the small-diameter female screw portion 10a is larger than the pitch of the large-diameter female screw portion 10b, but the pitch of the small-diameter female screw portion 10a is large-diameter female screw. You may form so that it may become smaller than the pitch of the part 10b. In this configuration, when the upper nut 10 is tightened, the distance between the lower nut 20 and the intermediate nut 30 is increased, so that a force in the tensile direction acts on the bolt 100. Therefore, even in this case, a sufficient locking force can be applied between the bolt 100 and the locking nut 1.

また、本実施形態においては、上ナット10における小径雌ねじ部10a及び大径雌ねじ部10bの螺旋方向に対して、下ナット20及び中ナット30における雌ねじ部25,35の螺旋方向を逆方向としているが、これらを同方向とすることも可能である。   In the present embodiment, the spiral direction of the female screw portions 25 and 35 in the lower nut 20 and the intermediate nut 30 is opposite to the spiral direction of the small-diameter female screw portion 10a and the large-diameter female screw portion 10b in the upper nut 10. However, they can also be in the same direction.

また、本実施形態においては、下ナット20に切欠部22を形成し、中ナット30に突部32を形成することにより、係合部を構成しているが、下ナット20に突部を形成し、中ナット30に切欠部を形成してもよい。   In the present embodiment, the notch 22 is formed in the lower nut 20 and the protrusion 32 is formed in the middle nut 30 to constitute the engaging portion, but the protrusion is formed in the lower nut 20. However, a cutout portion may be formed in the inner nut 30.

以下、実施例及び比較例を用いて、本発明を更に詳細に説明する。ただし、本発明が本実施形態に限定されるものではない。   Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to this embodiment.

実施例には図1に示す緩み止めナット1を用い、比較例には下ナット20のみを用いて、NAS(National Aerospace Standard)3350の規格に基づいた振動ゆるみ試験を行った。実施例及び比較例共に、下ナット20はM16×2とし、各ナットの締付けトルクを表1に示すように設定して試験を行った。   A loosening prevention nut 1 shown in FIG. 1 was used in the example, and only the lower nut 20 was used in the comparative example, and a vibration loosening test based on the NAS (National Aerospace Standard) 3350 standard was performed. In both the examples and the comparative examples, the lower nut 20 was M16 × 2, and the tightening torque of each nut was set as shown in Table 1 and the test was performed.

Figure 0004418899
表1から明らかなように、実施例は比較例より耐震時間が長く、優れた緩み止め効果が得られることを確認した。
Figure 0004418899
As is clear from Table 1, it was confirmed that the examples had a longer seismic resistance time than the comparative examples, and an excellent locking effect was obtained.

本発明の一実施形態に係る緩み止めナットの側面断面図である。It is side surface sectional drawing of the locking nut which concerns on one Embodiment of this invention. 図1に示す緩み止めナットの締め付け途中の状態を示す断面図である。It is sectional drawing which shows the state in the middle of clamping of the locking nut shown in FIG. 図1に示す緩み止めナットの締め付け後の状態を示す断面図である。It is sectional drawing which shows the state after the fastening of the locking nut shown in FIG. 従来の締結具を示す断面図である。It is sectional drawing which shows the conventional fastener.

符号の説明Explanation of symbols

1 緩み止めナット
10 上ナット
10a 小径雌ねじ部
10b 大径雌ねじ部
18 上側把持部
20 下ナット
22 切欠部
23 スペーサー
25 雌ねじ部
26 雄ねじ部
27 下側把持部
30 中ナット
32 突部
35 雌ねじ部
36 雄ねじ部
100 ボルト
105 被締結部材
110 ボルト孔

DESCRIPTION OF SYMBOLS 1 Locking nut 10 Upper nut 10a Small-diameter internal thread part 10b Large-diameter internal thread part 18 Upper side grip part 20 Lower nut 22 Notch part 23 Spacer 25 Internal thread part 26 Male thread part 27 Lower side grip part 30 Middle nut 32 Protrusion part 35 Internal thread part 36 Male thread Part 100 Bolt 105 Fastened member 110 Bolt hole

Claims (5)

内周面の一方側に小径雌ねじ部が形成され、他方側に前記小径雌ねじ部よりも径が大きい大径雌ねじ部が形成された上ナットと、
前記大径雌ねじ部に螺入される下ナットと、
前記小径雌ねじ部に螺入される中ナットとを備え、
前記上ナットは、前記小径雌ねじ部及び大径雌ねじ部のピッチが互いに相違するように形成されており、
前記下ナット及び中ナットは、係合手段を介して互いに係合することにより、相対的な回転が規制された状態で軸心が一致するように配置され、それぞれの内周面にボルトが螺合される雌ねじ部を有する緩み止めナット。
An upper nut having a small-diameter female screw portion formed on one side of the inner peripheral surface and a large-diameter female screw portion having a larger diameter than the small-diameter female screw portion on the other side;
A lower nut screwed into the large-diameter female thread portion;
An intermediate nut to be screwed into the small diameter female thread portion,
The upper nut is formed such that the pitches of the small-diameter female screw portion and the large-diameter female screw portion are different from each other,
The lower nut and the middle nut are engaged with each other through an engagement means so that the axes coincide with each other in a state in which relative rotation is restricted, and a bolt is screwed on each inner peripheral surface. A locking nut having a female threaded portion.
前記上ナットは、前記小径雌ねじ部のピッチが、前記大径雌ねじ部のピッチよりも大きくなるように形成されている請求項1に記載の緩み止めナット。   2. The locking nut according to claim 1, wherein the upper nut is formed such that a pitch of the small-diameter female screw portion is larger than a pitch of the large-diameter female screw portion. 前記上ナットにおける前記小径雌ねじ部及び大径雌ねじ部の螺旋方向は、前記下ナット及び中ナットの内周面における前記雌ねじ部の螺旋方向と反対方向である請求項1又は2に記載の緩み止めナット。   The loosening prevention according to claim 1 or 2, wherein the spiral direction of the small-diameter female screw portion and the large-diameter female screw portion in the upper nut is opposite to the spiral direction of the female screw portion on the inner peripheral surface of the lower nut and the middle nut. nut. 前記係合部は、前記下ナット及び中ナットのいずれか一方に設けられた突部と、他方に形成された切欠部とから構成されており、
前記切欠部は、底面にスペーサが設けられている請求項1から3のいずれかに記載の緩み止めナット。
The engaging portion is composed of a protrusion provided on one of the lower nut and the intermediate nut, and a notch formed on the other,
The locking nut according to any one of claims 1 to 3, wherein the notch has a spacer on the bottom surface.
前記上ナット及び下ナットは、外周面に把持部を有する請求項1から4のいずれかに記載の緩み止めナット。



The said upper nut and lower nut are locking nuts in any one of Claim 1 to 4 which has a holding part in an outer peripheral surface.



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JP2013113436A (en) * 2011-11-29 2013-06-10 Kazutomi Oka Locking double nut
DE102016000881A1 (en) * 2016-01-28 2017-08-03 Amtek Tekfor Holding Gmbh connecting device
KR102020270B1 (en) * 2017-03-07 2019-09-10 동국대학교 경주캠퍼스 산학협력단 Double thread bolt and double combination nut
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CN108869513B (en) * 2018-09-11 2019-09-03 李璟旻 General nut anti-looseness component
KR102107681B1 (en) * 2018-10-31 2020-05-07 동국대학교 경주캠퍼스 산학협력단 Double thread bolt, nut and snapring nut
KR102243897B1 (en) * 2019-06-26 2021-04-26 세메스 주식회사 A showerhead unit, a substrate processing apparatus including the showerhead unit, and a method of assembling the showerhead unit

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