JP5957632B2 - Locking nut - Google Patents

Locking nut Download PDF

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JP5957632B2
JP5957632B2 JP2013241351A JP2013241351A JP5957632B2 JP 5957632 B2 JP5957632 B2 JP 5957632B2 JP 2013241351 A JP2013241351 A JP 2013241351A JP 2013241351 A JP2013241351 A JP 2013241351A JP 5957632 B2 JP5957632 B2 JP 5957632B2
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elastic washer
convex engagement
arc width
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JP2015090214A (en
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芳昭 奥野
芳昭 奥野
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大阪フォーミング株式会社
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本発明は、ゆるみ止めナットに関するものである。  The present invention relates to a locking nut.

従来、ゆるみ止めナットとしては、中心部に軸方向に貫通するねじ孔が形成されたナット本体の上端面に環状カシメ部が設けられ、そのカシメ部の内部にねじ孔と同心で水平に平板状弾性ワッシャーがカシメ固定される一方、弾性ワッシャーの内周面に、図12に示されるように半径方向内方で面一状に突出する2個の凸状係合部片a,a´と2個の切欠凹部b,b´とがそれぞれ90°の等間隔で交互に形成されるとともに、各凸状係合部片a,aの内周面がねじ孔の内径とほぼ同径の円弧状に形成され、かつ、各切欠凹部b,b´の内周面がねじ孔の谷径よりも大径の円弧状に形成され構成されている。  Conventionally, as a locking nut, an annular caulking portion is provided at the upper end surface of the nut body in which a screw hole penetrating in the axial direction is formed in the center portion, and a flat plate shape is concentric with the screw hole and horizontally inside the caulking portion. On the other hand, the elastic washer is fixed by caulking. On the inner peripheral surface of the elastic washer, as shown in FIG. 12, two convex engaging pieces a, a ′ and 2 projecting in a flush manner inward in the radial direction. The notch recesses b and b ′ are alternately formed at equal intervals of 90 °, and the inner peripheral surface of each convex engagement piece a is a circular arc having the same diameter as the inner diameter of the screw hole. And the inner peripheral surface of each notch recess b, b ′ is formed in an arc shape having a diameter larger than the valley diameter of the screw hole.

そして、このゆるみ止めナットのボルトへの螺入に際しては、上記弾性ワッシャーの一方側で90°の円弧幅の凸状係合部片をボルトのねじ山を探るためのものとしてボルトのねじ山の間に入り込ませる一方、残る他方側で90°の円弧幅の凸状係合部片を弾性変形させながらボルトのねじ山を強圧し、これにより自然回動を防止する摩擦トルク(以下、プリベリングトルクという)を発生させて、ナットのゆるみ止めを図るようにしている。  When the locking nut is screwed into the bolt, the convex threaded portion of the 90 ° arc width on one side of the elastic washer is used to search for the screw thread of the bolt. Friction torque (hereinafter referred to as pre-leveling) that prevents the natural rotation of the bolt by applying pressure to the threaded portion of the bolt while elastically deforming the convex engaging piece with a 90 ° arc width on the other side. (Referred to as torque) to prevent the nut from loosening.

しかし、従来、使用されている上記した構成の弾性ワッシャーでは、手作業により、90°の円弧幅の凸状係合部片を弾性変形させかつボルトのねじ山に当接させながら入り込ませるのが硬くて困難であり、非常に作業性が悪くなる問題がある。また、凸状係合部片はボルトのねじ山を傷つけやすく、焼き付けの原因となっているのが大きな欠点であり、問題である。  However, in the conventional elastic washer having the above-described configuration, it is possible to manually insert the projecting engaging piece having a 90 ° arc width while being elastically deformed and in contact with the screw thread of the bolt. There is a problem that it is hard and difficult and the workability is very poor. Further, the projecting engagement piece is liable to damage the screw thread of the bolt, and causing a seizure is a major drawback and a problem.

そこで、本発明は、ゆるみ止め用の平板状弾性ワッシャーにおける凸状係合部片の形状、形成位置、厚み、カシメ固定方法を工夫することにより、手作業でもボルトに容易にねじ込めるように工夫するようにして、作業性の向上を図るとともに、ボルトのねじ山を傷つけにくく、焼き付きを防ぎ、それでいて凸状係合部片によるナットのゆるみ止め効果を確実に維持できるゆるみ止めナットの開発を課題とする。  Therefore, the present invention is devised so that it can be easily screwed into the bolt even by manual work by devising the shape, forming position, thickness, and caulking fixing method of the convex engagement piece in the flat elastic washer for preventing loosening. As a result, it is necessary to develop a locking nut that improves workability, prevents the screw thread from being damaged, prevents seizure, and reliably maintains the locking effect of the nut by the convex engagement piece. And

本願の請求項1記載の発明は、中心部に軸方向に貫通するねじ孔が形成されたナット本体の上端面に環状カシメ部が設けられ、そのカシメ部の内部にねじ孔と同心で水平に平板状弾性ワッシャーがカシメ固定される一方、弾性ワッシャーの内周面に、半径方向内方で面一状に突出する2個の第1凸状係合部片と第2凸状係合部片と2個の第1切欠凹部と第2切欠凹部とが交互に形成されるとともに、第1凸状係合部片と第2凸状係合部片のうち、一方の第1凸状係合部片は他方の第2凸状係合部片よりも角度を大きく取り、円弧幅の広い凸状係合部片に形成され、また他方の第2凸状係合部片は角度を小さくし、円弧幅の狭い凸状係合部片に形成されており、各凸状係合部片の内周面がねじ孔の内径とほぼ同径の円弧状に形成されているとともに、各切欠凹部の内面がねじ孔の谷径よりも大径の円弧状に形成されており、かつ、第1切欠凹部と第2切欠凹部のうち、いずれか一方の切欠凹部は他方の切欠凹部よりも角度を大きく取り、他方の切欠凹部よりも円弧幅の広い切欠凹部に形成されており、これにより第2凸状係合部片に対する第1凸状係合部片の形成位置に変化を付けて、ねじ込み時のトルクを軽減または増加させることを特徴とする。In the invention according to claim 1 of the present application, an annular caulking portion is provided on the upper end surface of the nut body in which a screw hole penetrating in the axial direction is formed in the center portion, and the caulking portion is horizontally concentric with the screw hole. While the flat elastic washer is caulked and fixed, two first convex engaging pieces and a second convex engaging piece protruding radially inward from the inner peripheral surface of the elastic washer And two first notch recesses and second notch recesses are alternately formed, and one of the first projecting engagement pieces and the second projecting engagement piece is the first projecting engagement. The piece has a larger angle than the other second convex engaging piece and is formed in a convex engaging piece having a wide arc width, and the other second convex engaging piece has a smaller angle. is formed in a narrow convex engaging piece having an arc width, the inner peripheral surface of each convex-like engaging piece is formed in a circular arc shape of substantially the same diameter as the inner diameter of the screw hole bets In, than the root diameter of the inner surface screw holes of each cutout recess is formed in an arc shape having a large diameter, and, among the first cutout recess and a second cutout recesses, one cutout recess or the other notch The angle is larger than that of the recess, and is formed in a notch recess having a larger arc width than the other notch recess, thereby changing the formation position of the first projecting engagement piece with respect to the second projecting engagement piece. To reduce or increase the torque at the time of screwing .

ゆるみ止め用の平板状弾性ワッシャーにおける2個の凸状係合部片のうち、弾性変形させながらボルトのねじ山を強圧し、自然回動を防止するプリベリングトルクを発生させる第1凸状係合部片の角度を広くすることで大きな接触面積と大きな軸方向への変形量でボルトのねじ山を強圧することができる。その結果、平板状弾性ワッシャーのプリベリングトルク値を、求めるプリベリングトルク値と同じに設定する場合、該ワッシャーの厚みを従来の平板状弾性ワッシャーの厚みに比べて薄く抑えることが可能になる。
したがって、平板状弾性ワッシャーの厚みを積極的に薄く設定することによって、手作業でも容易に弾性変形させながら入り込ませることが可能になる。つまり、作業を著しく高めることができ、ボルトのねじ山を傷つけにくくするとともに、焼き付を抑えることができる。しかも、第1凹状切欠部と第2凹状切欠部の円弧幅を異ならしめる構成とする ことにより第2凸状係合部片に対する第1凸状係合部片の形成位置に変化を付けて、ねじ込み時のトルクを軽減または増加させることができる。これにより、凸状係合部片を弾性変形させかつボルトのねじ山に当接させながら入り込ませる硬さの調節をより幅広く行うことができる。その結果、凸状係合部片の角度やゆるみ止め用の平板状弾性ワッシャーの厚みに加えて凸状係合部片の形成位置を幅広く変化させることによって、更に、作業を著しく高めることができ、ボルトのねじ山を傷つけにくくするとともに、焼き付を抑えることができる。
Of the two convex engaging pieces in the flat elastic washer for preventing loosening, a first convex engagement member that generates a pre-baling torque that strongly presses the screw thread of the bolt while elastically deforming to prevent natural rotation. By widening the angle of the joint piece, the screw thread of the bolt can be strongly pressed with a large contact area and a large amount of deformation in the axial direction. As a result, when the pre-leveling torque value of the flat elastic washer is set to be the same as the required pre-torque torque value, the thickness of the washer can be reduced compared to the thickness of the conventional flat elastic washer.
Therefore, by setting the thickness of the plate-like elastic washer to be thin, it is possible to enter it while easily elastically deforming it manually. That is, the work can be remarkably enhanced, the screw thread of the bolt is hardly damaged, and the seizure can be suppressed. Moreover, by changing the arc width of the first concave notch and the second concave notch to change the formation position of the first convex engaging piece with respect to the second convex engaging piece, Torque during screwing can be reduced or increased. As a result, the hardness of the convex engagement piece can be adjusted more broadly while being elastically deformed and brought into contact with the screw thread of the bolt. As a result, the work can be remarkably improved by widely changing the formation position of the convex engagement piece in addition to the angle of the convex engagement piece and the thickness of the flat elastic washer for locking. In addition to making it difficult to damage the thread of the bolt, seizure can be suppressed.

本発明の基になる構成を備えたゆるみ止めナットの参考例の平面図である。It is a top view of the reference example of the locking nut provided with the composition used as the basis of the present invention. 同参考例のナットの一部切欠正面図である。It is a partially notched front view of the nut of the reference example . 同参考例の平板状弾性ワッシャーの平面図である。It is a top view of the flat elastic washer of the reference example . 同参考例の使用状態を示す断面図である。It is sectional drawing which shows the use condition of the reference example . 同参考例の別の平板状弾性ワッシャーの平面図である。It is a top view of another flat elastic washer of the reference example . 同参考例の別の平板状弾性ワッシャーの平面図である。It is a top view of another flat elastic washer of the reference example . 同参考例の別の平板状弾性ワッシャーの平面図である。It is a top view of another flat elastic washer of the reference example . 同参考例の別の平板状弾性ワッシャーの平面図である。It is a top view of another flat elastic washer of the reference example . 同参考例の平板状弾性ワッシャーの平面図である。It is a top view of the flat elastic washer of the reference example . 本発明に係る平板状弾性ワッシャーの平面図である。It is a top view of the flat elastic washer which concerns on this invention . 本発明に係る別の平板状弾性ワッシャーの平面図である。 It is a top view of another flat elastic washer concerning the present invention . 従来の平板状弾性ワッシャーの平面図である。It is a top view of the conventional flat elastic washer.

以下本発明に係るゆるみ止めナットを図に基づいて説明する。  Hereinafter, a locking nut according to the present invention will be described with reference to the drawings.

図1〜図9は、本発明に係るゆるみ止めナットの基本構成を備えた参考例となるゆるみ止めナットを示し、図1及び図2に示すように参考ゆるみ止めナットNは、中心部に軸方向に貫通するねじ孔1aが形成されたナット本体1と、このナット本体1の上面にカシメ止めされた平板状弾性ワッシャー2とを備える。ナット本体1の上面には、ねじ孔1aと同心でかつねじ孔1aの谷径よりも大径の環状カシメ部11が設けられ、ナット本体1の下部には、座部12が設けられている。なお、ナット本体1の形状としては図2のように平面視六角形とするほか、たとえば四角形や八角形などの多角形或いは円筒形であってもよいし、また、ナット本体1の下部には、鍔状の座部(図示せず)を設けてもよい。 1 to 9 show a locking nut as a reference example provided with a basic structure of a locking nut according to the present invention . As shown in FIGS. 1 and 2, the locking locking nut N has a shaft at the center. A nut main body 1 in which a screw hole 1a penetrating in the direction is formed, and a plate-like elastic washer 2 crimped to the upper surface of the nut main body 1 are provided. An annular caulking portion 11 that is concentric with the screw hole 1 a and larger than the root diameter of the screw hole 1 a is provided on the upper surface of the nut body 1, and a seat portion 12 is provided at the lower portion of the nut body 1. . The shape of the nut body 1 is a hexagonal shape in plan view as shown in FIG. 2, and may be a polygon or a cylinder such as a quadrangle or an octagon, for example. A bowl-shaped seat (not shown) may be provided.

平板状弾性ワッシャー2は、図3に示すように金属製弾性板からなり、その内周面に、半径方向内方に突出しかつその突出端がねじ孔1aの内径とほぼ同径の円弧状に形成された2個の第1、第2凸状係合部片21,22と、内面がねじ孔の谷径よりも大径の円弧状に形成された2個の第1、第2凹状切欠部23,24とが交互に形成されている。  The flat elastic washer 2 is made of a metal elastic plate as shown in FIG. 3, and protrudes radially inward on the inner peripheral surface thereof, and its protruding end is in an arc shape having the same diameter as the inner diameter of the screw hole 1a. Two formed first and second convex engaging pieces 21, 22 and two first and second concave notches formed on the inner surface in an arc shape having a diameter larger than the valley diameter of the screw hole. The portions 23 and 24 are alternately formed.

そして、第1、第2凸状係合部片21,22のうち、一方の第1凸状係合部片21は他方の第2凸状係合部片22よりも角度を180°と大きく取り円弧幅の広い凸状係合部片に形成し、また他方の第2凸状係合部片22は角度を90°と小さくし円弧幅の狭い凸状係合部片に形成されている。また、これら第1凸状係合部片21と第2凸状係合部片22との間に介在される第1、第2凹状切欠部23,24はそれぞれ角度が45°の円弧幅に形成されている。  Of the first and second convex engaging part pieces 21, 22, one first convex engaging part piece 21 has an angle of 180 ° larger than the other second convex engaging part piece 22. The other second convex engagement piece 22 is formed as a convex engagement piece with a small arc width and a narrow arc width. . Further, the first and second concave cutout portions 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 have an arc width of 45 °, respectively. Is formed.

平板状弾性ワッシャー2の厚みは、従来の弾性ワッシャーの厚みに比べて積極的に薄く形成され、手作業で凸状係合部片21,22をボルトのねじ山の間に容易に入り込ませることを可能にしている。つまり、第1凸状係合部片21の円弧幅(180°)を第2凸状係合部片22の円弧幅(90°)よりも2倍大きくしているので、従来の弾性ワッシャーの厚みと同じ厚みであればそれだけプリベリングトルクを大きく設定されることになる。そのため、平板状弾性ワッシャー2のプリベリングトルク値を、求めるプリベリングトルク値と同じに設定する場合、平板状弾性ワッシャー2の厚みを従来の弾性ワッシャーの厚みに比べて薄く抑えることになる。これにより、積極的に手作業で凸状係合部片21,22をボルトのねじ山の間に容易に入り込ませることが可能になる。  The thickness of the flat elastic washer 2 is formed to be thinner than the thickness of the conventional elastic washer, and the convex engagement pieces 21 and 22 can be easily inserted between the bolt threads by hand. Is possible. In other words, the arc width (180 °) of the first convex engagement piece 21 is set twice as large as the arc width (90 °) of the second convex engagement piece 22. If it is the same thickness as the thickness, the pre-leveling torque is set to be large accordingly. For this reason, when the pre-leveling torque value of the flat elastic washer 2 is set to be the same as the required pre-ringing torque value, the thickness of the flat elastic washer 2 is reduced compared to the thickness of the conventional elastic washer. As a result, it is possible to easily allow the convex engagement pieces 21 and 22 to easily enter between the screw threads of the bolt.

このように形成された平板状弾性ワッシャー2は、環状カシメ部11の内部に、ねじ孔1aと同心で水平状にカシメ固定される。  The flat elastic washer 2 formed in this way is caulked and fixed in the annular caulking portion 11 in a horizontal manner concentric with the screw hole 1a.

具体的には、平板状弾性ワッシャー2をナット本体1の上面にカシメ固定する際、予めナット本体1の上端面に、ねじ孔1aと同心にざぐり穴(図示せず)が形成され、このざぐり穴の底面に平板状弾性ワッシャー2がねじ孔1aと同心で水平に位置決め載置され、その後、ざぐり穴の周壁を内側にカシメることにより平板状弾性ワッシャー2はざぐり穴の底面にカシメ固定される。  Specifically, when the plate-like elastic washer 2 is caulked and fixed to the upper surface of the nut body 1, a counterbore (not shown) is formed on the upper end surface of the nut body 1 concentrically with the screw hole 1a in advance. A flat elastic washer 2 is positioned and placed concentrically with the screw hole 1a on the bottom surface of the hole, and then the flat elastic washer 2 is caulked and fixed to the bottom surface of the counterbored hole by caulking the peripheral wall of the counterbore. The

以上のように構成した参考例のゆるみ止めナットの使用状態について説明する。The use state of the locking nut of the reference example configured as described above will be described.

使用時には、図4に示すようにゆるみ止めナットNをボルト3に手作業で螺入し、その後、適宜締付工具によりゆるみ止めナットNを締め付けて被締付物(図示せず)を強固に緊締する。その螺入の際、ゆるみ止めナットNの上面には、平板状弾性ワッシャー2がカシメ固定されているので、まず、手作業で薄肉とした平板状弾性ワッシャー2の第1凹状切欠部23を利用して第2凸状係合部片22でボルト3のねじ3aの切上がりを探り、この切上がりから第2凸状係合部片22をねじ山間に入り込ませて螺入させる。このとき、第2凸状係合部片22はその角度が90°で円弧幅が狭く、ほとんど変形することなくねじ山間に螺入されるので、ゆるみ止めのバネとしては機能しない。  In use, as shown in FIG. 4, the locking nut N is manually screwed into the bolt 3, and then the locking nut N is tightened with a proper tightening tool to firmly tighten the object to be tightened (not shown). Tighten. Since the flat elastic washer 2 is caulked and fixed to the upper surface of the locking nut N at the time of the screwing, first, the first concave notch 23 of the flat elastic washer 2 thinned manually is used. Then, the second convex engagement portion piece 22 is searched for the rise of the screw 3a of the bolt 3, and the second convex engagement portion piece 22 is inserted into the screw thread from this rise. At this time, the second convex engagement piece 22 has an angle of 90 °, a narrow arc width, and is screwed between the threads with almost no deformation, so it does not function as a spring for preventing loosening.

次に、引き続き手作業でゆるみ止めナットNをボルト3に回転操作することにより、ボルト3のねじ3aの切上がりを、平板状弾性ワッシャー2の第2切欠凹部24の隙間から第1凸状係合部片21に入り込ませて螺入させる。これにより、角度が180°で円弧幅の広い第1凸状係合部片21をねじ山間に弾性変形させながら螺入させる。  Next, by continuing to manually rotate the locking nut N to the bolt 3, the screw 3a of the bolt 3 is lifted up from the gap of the second notch recess 24 of the flat elastic washer 2 to the first convex engagement. The joint piece 21 is inserted and screwed. As a result, the first convex engagement piece 21 having an angle of 180 ° and a wide arc width is screwed in while being elastically deformed between the threads.

この第1凸状係合部片21のねじ山間への螺入時、第1凸状係合部片21は180°とその円弧幅が第2凸状係合部片22の円弧幅の2倍となるよう広く形成されているので、大きな接触面積と大きな軸方向への変形量でボルトのねじ山を強圧することができる。その結果、平板状弾性ワッシャー2のプリベリングトルク値を求めるプリベリングトルク値と同じに設定した場合、該ワッシャーの厚みを従来の平板状弾性ワッシャーの厚みに比べて薄く抑えることが可能になる。
したがって、平板状弾性ワッシャーの厚みを積極的に薄く設定することによって、手作業でも容易に弾性変形させながら入り込ませることが可能になる。つまり、作業を著しく高めることができ、ボルトのねじ山を傷つけにくくするとともに、焼き付を抑えることができる。その上、再使用ができなくなるといった問題も解消できる。
When the first convex engagement piece 21 is screwed between the threads, the first convex engagement piece 21 is 180 ° and its arc width is 2 of the arc width of the second convex engagement piece 22. Since it is formed so as to be doubled, the screw thread of the bolt can be strongly pressed with a large contact area and a large amount of deformation in the axial direction. As a result, when the pre-balancing torque value for obtaining the pre-baling torque value of the flat elastic washer 2 is set, the thickness of the washer can be reduced compared to the thickness of the conventional flat elastic washer.
Therefore, by setting the thickness of the plate-like elastic washer to be thin, it is possible to enter it while easily elastically deforming it manually. That is, the work can be remarkably enhanced, the screw thread of the bolt is hardly damaged, and the seizure can be suppressed. In addition, the problem that it cannot be reused can be solved.

また、第1凸状係合部片21及び第2凸状係合部片22の円弧幅は、上述した実施の形態のものに限定されるものではなく、使用するボルトの種類や大きさ或いは用途などにより、平板状弾性ワッシャー2における第1凸状係合部片21を150°〜240°の範囲の円弧幅に、また他方の第2凸状係合部片22を60°〜90°の範囲の円弧幅に形成し、さらにこれら第1凸状係合部片21と第2凸状係合部片22の間に介在される第1、第2凹状切欠部23,24をそれぞれ30°〜60°の範囲の円弧幅に適宜選択して形成してもよい。  Further, the arc widths of the first convex engagement piece 21 and the second convex engagement piece 22 are not limited to those of the above-described embodiment, and the type and size of the bolt used or Depending on the application and the like, the first convex engaging piece 21 in the flat elastic washer 2 has an arc width in the range of 150 ° to 240 °, and the other second convex engaging piece 22 is 60 ° to 90 °. The first and second concave cutouts 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 are respectively 30. It may be formed by appropriately selecting an arc width in the range of ° to 60 °.

具体的には、図5に示すように第1凸状係合部片21の円弧幅を180°と大きくし、その上で第2凸状係合部片22の円弧幅を60°に、また第1及び第2凹状切欠部23,24の円弧幅を60°に形成したり、図6に示すように第1凸状係合部片21の円弧幅を120°と大きくし、その上で第2凸状係合部片22の円弧幅を60°に、また第1及び第2凹状切欠部23,24の円弧幅を90°に形成したり、図7に示すように第1凸状係合部片21の円弧幅を120°と大きくし、その上で第2凸状係合部片22の円弧幅を90°に、また第1及び第2凹状切欠部23,24の円弧幅を75°に形成したり、図8に示すように第1凸状係合部片21の円弧幅を150°とし、第2凸状係合部片22の円弧幅を90°に、また第1及び第2凹状切欠部23,24の円弧幅を60°に形成したり、さらには図9に示すように第1凸状係合部片21の円弧幅を240°と大きくし、その上で第2凸状係合部片22の円弧幅を60°に、また第1及び第2凹状切欠部23,24の円弧幅を30°に形成してもよい。  Specifically, as shown in FIG. 5, the arc width of the first convex engagement piece 21 is increased to 180 °, and then the arc width of the second convex engagement piece 22 is set to 60 °. Further, the arc width of the first and second concave notches 23 and 24 is formed to 60 °, or the arc width of the first convex engaging piece 21 is increased to 120 ° as shown in FIG. The arcuate width of the second convex engaging piece 22 is 60 °, and the arcuate widths of the first and second concave notches 23 and 24 are 90 °. As shown in FIG. The arcuate width of the first engagement portion 21 is increased to 120 °, the arc width of the second convex engagement portion 22 is increased to 90 °, and the arcs of the first and second concave notches 23 and 24 As shown in FIG. 8, the first convex engagement piece 21 has an arc width of 150 °, the second convex engagement piece 22 has an arc width of 90 °, as shown in FIG. 1st and 2nd concave cut The arc width of the notches 23 and 24 is formed to 60 °, and the arc width of the first convex engagement piece 21 is increased to 240 ° as shown in FIG. The arc width of the engaging piece 22 may be 60 °, and the arc widths of the first and second concave notches 23 and 24 may be 30 °.

このように、第1,第2凸状係合部片21,22及び第1,第2凹状切欠部23,24の円弧幅を適宜選択することにより、使用するボルトの種類や大きさ或いは用途などに合わせた形状で求めるプリベリングトルクが得られながら平板状弾性ワッシャー2の厚みを最適な状態に薄く設定することができる。その結果、手作業によるゆるみ止めナットNのボルトへのねじ込みを使用するボルトの種類やサイズ或いは用途などに合わせてより楽に行え、かつナットのゆるみ止め効果も確実に発揮できる。  Thus, by appropriately selecting the arc widths of the first and second convex engaging portion pieces 21 and 22 and the first and second concave notched portions 23 and 24, the type, size, or application of the bolt to be used. It is possible to set the thickness of the flat elastic washer 2 to an optimum state while obtaining a pre-leveling torque obtained in a shape adapted to the above. As a result, it is possible to more easily perform the locking of the locking nut N into the bolt by hand according to the type, size, or application of the bolt to be used, and to securely exhibit the locking effect of the nut.

次に、本発明に係るゆるみ止めナットについて説明する。
まず、基本構成としては、上述した図1〜図4に示す参考例のゆるみ止めナットNと同様で、その図示は省略しているが、中心部に軸方向に貫通するねじ孔1aが形成されたナット本体1の上端面に環状カシメ部11が設けられ、そのカシメ部11の内部に図10又は図11に示すようなねじ孔1aと同心で水平に平板状弾性ワッシャー2がカシメ固定されてなる構成を備える。(なお、同様の符号を付与したので図1〜図4を参照のこと)
そして、以上のように構成するゆるみ止めナットNの弾性ワッシャー2の内周面に、半径方向内方で面一状に突出する2個の第1凸状係合部片21と第2凸状係合部片22と2個の第1切欠凹部23と第2切欠凹部24とが交互に形成されるとともに、第1凸状係合部片21と第2凸状係合部片22のうち、一方の第1凸状係合部片21は他方の第2凸状係合部片22よりも角度を大きく取り、円弧幅の広い凸状係合部片21に形成され、また他方の第2凸状係合部片22は角度を小さくし、円弧幅の狭い凸状係合部片22に形成されており、さらに、各凸状係合部片21,22の内周面がねじ孔1aの内径とほぼ同径の円弧状に形成されているとともに、各切欠凹部23の内面がねじ孔1aの谷径よりも大径の円弧状に形成されており、かつ、第1切欠凹部23と第2切欠凹部24のうち、いずれか一方の切欠凹部は他方の切欠凹部よりも角度を大きく取り、他方の切欠凹部よりも円弧幅の広い切欠凹部に形成されている。これにより第2凸状係合部片22に対する第1凸状係合部片21の周方向における形成位置に変化を付けて、その形成位置による特性をかしてねじ込み時のトルクを軽減させたり、または増加させるように構成したのである。
Next, the locking nut according to the present invention will be described.
First, the basic configuration is the same as that of the locking nut N of the reference example shown in FIGS. 1 to 4 described above. Although not shown, a screw hole 1a penetrating in the axial direction is formed at the center. An annular caulking portion 11 is provided on the upper end surface of the nut body 1, and a flat elastic washer 2 is caulked and fixed in the caulking portion 11 concentrically with the screw hole 1a as shown in FIG. It has the composition which becomes. (Please refer to FIGS. 1 to 4 because the same reference numerals are given)
Then, on the inner peripheral surface of the elastic washer 2 of the locking nut N configured as described above, two first convex engaging pieces 21 and a second convex shape projecting in the same radial direction inward. The engaging piece 22 and the two first cutout recesses 23 and the second cutout recesses 24 are alternately formed, and the first protruding engagement piece 21 and the second protruding engagement piece 22. The first convex engaging piece 21 has a larger angle than the other second convex engaging piece 22 and is formed into a convex engaging piece 21 having a wide arc width. The two convex engaging pieces 22 are formed in the convex engaging pieces 22 having a small angle and a narrow arc width, and the inner peripheral surfaces of the convex engaging pieces 21 and 22 are screw holes. The inner surface of each notch recess 23 is formed in an arc shape larger in diameter than the valley diameter of the screw hole 1a. Of the first notch recess 23 and the second notch recess 24, one of the notch recesses has a larger angle than the other notch recess and is formed in a notch recess having a larger arc width than the other notch recess. . Thus with the change in the formation position in the circumferential direction of the second convex engaging piece 22 first convex engaging piece 21 with respect to, and reduce the torque during screwing lend active properties due to the formation position Or configured to increase .

具体的には、例えば図10に示すように第1凸状係合部片21の円弧幅を120°と大きくし、第2凸状係合部片22の円弧幅を60°に形成する一方、第1凹状切欠部23の円弧幅を120°に、また第2凹状切欠部24の円弧幅を60°に形成して、円弧幅の広い第1凹状切欠部23を介して第1凸状係合部片21をねじ込むことによりねじ込み時のトルクを軽減させることができる。また、図11に示すように第1凸状係合部片21の円弧幅を150°と大きくし、第2凸状係合部片22の円弧幅を60°に形成する一方、第1凹状切欠部23の円弧幅を60°に、また第2凹状切欠部24の円弧幅を90°に形成して、円弧幅の狭い第1凹状切欠部23を介して第1凸状係合部片21をねじ込むことによりねじ込み時のトルクを増加させることができる。  Specifically, for example, as shown in FIG. 10, the arc width of the first convex engagement piece 21 is increased to 120 °, and the arc width of the second convex engagement piece 22 is formed to 60 °. The first concave notch 23 has an arc width of 120 °, and the second concave notch 24 has an arc width of 60 °, and the first convex notch 23 has a large arc width. By screwing the engaging piece 21, the torque at the time of screwing can be reduced. Further, as shown in FIG. 11, the arc width of the first convex engagement piece 21 is increased to 150 ° and the arc width of the second convex engagement piece 22 is formed to 60 °, while the first concave shape The arcuate width of the notch 23 is formed at 60 °, and the arcuate width of the second concave notch 24 is formed at 90 °, and the first convex engaging piece is formed via the first concave notch 23 having a narrow arc width. The torque at the time of screwing can be increased by screwing 21.

このように第1凹状切欠部23と第2凹状切欠部24の円弧幅を異ならしめる構成とすることにより第2凸状係合部片22に対する第1凸状係合部片21の周方向における形成位置に変化を付けて、ねじ込み時のトルクを軽減または増加させることができる。これにより、凸状係合部片を弾性変形させかつボルトのねじ山に当接させながら入り込ませる硬さの調節をより幅広く行うことができる。その結果、凸状係合部片の角度やゆるみ止め用の平板状弾性ワッシャー2の厚みに加えて凸状係合部片の形成位置を幅広く変化させることによって、更に、作業を著しく高めることができ、ボルトのねじ山を傷つけにくくするとともに、焼き付を抑えることができる。  Thus, by making the arc widths of the first concave notch 23 and the second concave notch 24 different, the circumferential direction of the first convex engaging piece 21 with respect to the second convex engaging piece 22 is made. The forming position can be changed to reduce or increase the torque at the time of screwing. As a result, the hardness of the convex engagement piece can be adjusted more broadly while being elastically deformed and brought into contact with the screw thread of the bolt. As a result, the work can be further enhanced by changing the formation position of the convex engagement piece in a wide range in addition to the angle of the convex engagement piece and the thickness of the flat elastic washer 2 for preventing loosening. This makes it difficult to damage the screw threads of the bolts and suppresses seizure.

また、平板状弾性ワッシャー2の厚みとしては、たとえば従来の平板状弾性ワッシャーの板厚が0.3mmであれば、板厚を0.2mmに薄くしたり、従来の平板状弾性ワッシャーの板厚が0.2mmであれば、板厚を0.15mmに薄くしたり、従来の平板状弾性ワッシャーの板厚が0.15mmであれば、板厚を0.1mmに薄くするといったように形成する。  Further, as the thickness of the flat elastic washer 2, for example, if the plate thickness of the conventional flat elastic washer is 0.3 mm, the plate thickness is reduced to 0.2 mm, or the plate thickness of the conventional flat elastic washer is If the plate thickness is 0.2 mm, the plate thickness is reduced to 0.15 mm, or if the plate thickness of the conventional flat elastic washer is 0.15 mm, the plate thickness is reduced to 0.1 mm. .

N ゆるみ止めナット
1 ナット本体
1a ねじ孔
11 環状カシメ部
2 平板状弾性ワッシャー
21 第1凸状係合部片
22 第2凸状係合部片
23 第1凹状切欠部
24 第2凹状切欠部
N Locking nut 1 Nut body 1a Screw hole 11 Ring caulking portion 2 Flat elastic washer 21 First convex engagement piece 22 Second convex engagement piece 23 First concave cutout 24 Second concave cutout

Claims (1)

中心部に軸方向に貫通するねじ孔が形成されたナット本体の上端面に環状カシメ部が設けられ、そのカシメ部の内部にねじ孔と同心で水平に平板状弾性ワッシャーがカシメ固定される一方、弾性ワッシャーの内周面に、半径方向内方で面一状に突出する2個の第1凸状係合部片と第2凸状係合部片と2個の第1切欠凹部と第2切欠凹部とが交互に形成されるとともに、第1凸状係合部片と第2凸状係合部片のうち、一方の第1凸状係合部片は他方の第2凸状係合部片よりも角度を大きく取り、円弧幅の広い凸状係合部片に形成され、また他方の第2凸状係合部片は角度を小さくし、円弧幅の狭い凸状係合部片に形成されており、各凸状係合部片の内周面がねじ孔の内径とほぼ同径の円弧状に形成されているとともに、各切欠凹部の内面がねじ孔の谷径よりも大径の円弧状に形成されており、かつ、第1切欠凹部と第2切欠凹部のうち、いずれか一方の切欠凹部は他方の切欠凹部よりも角度を大きく取り、他方の切欠凹 部よりも円弧幅の広い切欠凹部に形成されており、これにより第2凸状係合部片に対する第1凸状係合部片の形成位置に変化を付けて、ねじ込み時のトルクを軽減または増加させることを特徴とするゆるみ止めナット。An annular caulking portion is provided on the upper end surface of the nut main body in which a screw hole penetrating in the axial direction is formed in the central portion, and a flat elastic washer is caulked and fixed concentrically with the screw hole inside the caulking portion. , Two first convex engaging pieces, two convex engaging pieces, two first cut-out concave portions, and two first cut-out concave portions projecting on the inner peripheral surface of the elastic washer in a radially inward direction. The two notch recesses are alternately formed, and one of the first convex engagement piece and the second convex engagement piece is one of the second convex engagement pieces. A convex engagement part having a larger angle than the joint piece and formed in a convex engagement part with a wide arc width, and the other second convex engagement part piece having a smaller angle and a narrow arc width. It is formed on one, together with the inner peripheral surface of each convex-like engaging piece is formed in a circular arc shape of substantially the same diameter as the inner diameter of the screw hole, the inner surface of the cutout recess screw Of which is formed into an arc shape having a larger diameter than the root diameter, and, among the first cutout recess and a second cutout recesses, one cutout recess either takes larger angle than the other cutout recess, the other than the cutout concave portion is formed in a wide cutout recess of the arc width, thereby with a change in the formation position of the first convex engaging piece to the second convex engaging piece, the torque during screwing A locking nut characterized in that it is reduced or increased .
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