JP6347367B2 - Locking nut - Google Patents

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JP6347367B2
JP6347367B2 JP2014249337A JP2014249337A JP6347367B2 JP 6347367 B2 JP6347367 B2 JP 6347367B2 JP 2014249337 A JP2014249337 A JP 2014249337A JP 2014249337 A JP2014249337 A JP 2014249337A JP 6347367 B2 JP6347367 B2 JP 6347367B2
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elastic washer
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convex engagement
inner peripheral
piece
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JP2016099002A (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、例えば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、この弾性ワッシャーの内周面に、例えば図17及び図18に示されてい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, for example, an annular caulking portion is provided on the upper end surface of a nut body in which a screw hole penetrating in the axial direction is formed in the center portion, and a flat plate horizontally concentrically with the screw hole inside the caulking portion. The convex elastic washer is fixed by caulking, and two convex engagements are formed on the inner peripheral surface of the elastic washer so as to protrude flush with each other radially inward as shown in FIGS. 17 and 18, for example. The pieces a, a ′ and the two notched recesses b, b ′ are alternately formed at equal intervals of 90 °, and the inner peripheral surfaces of the convex engaging pieces a, a ′ are screw holes. The inner circumferential surface of each notch recess b, b 'is formed in an arc shape larger in diameter 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a,a´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a,a´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 nuts are screwed into the bolts, the convex engaging portions a and a ′ having a 90 ° arc width on one side of the elastic washer are used for searching for the screw thread of the bolt. The screw thread of the bolt is strongly pressed while elastically deforming the convex engagement pieces a and a ′ having a 90 ° arc width on the other side while preventing the natural rotation. Friction torque (hereinafter referred to as pre-leveling torque) is generated to prevent the nut from loosening.

ところで、従来、使用されている上記した構成の弾性ワッシャーは、例えば平板を打ち抜き加工して、外周が円形の平板でその中心部に90°の円弧幅の2個の凸状係合部片a,a´と2個の切欠凹部b,b´をそれぞれ交互に形成してなるもので、図18に示すような単純な一枚の扁平板形状を呈するものである。そのため、90°の円弧幅の凸状係合部片a,a´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際、凸状係合部片a,a´の突出側両端角部がねじ山に突き当たりながら無理やり弾性変形させられてねじ込まれることになる。その結果、凸状係合部片a,a´はボルトのねじ山間にスムーズに入りづらいものであり、作業性が悪い問題がある。しかも、凸状係合部片a,a´の突出側両端角部はボルトのねじ山を傷つけやすく、鍍金はがれによる腐食の原因や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。また、凸状係合部片a,a´の突出側両端角部によりボルトのねじ山を損傷させてしまうと、再使用が不能となる問題も有していた。鍍金はがれによる腐食の原因や焼き付けを引き起こし、再使用が不能となる問題も有していた。  By the way, the above-described elastic washer having the above-described configuration is formed by punching a flat plate, for example, and has two convex engagement pieces a having a circular outer periphery and an arc width of 90 ° at the center thereof. , A ′ and two notch recesses b, b ′ are formed alternately, and has a simple flat plate shape as shown in FIG. Therefore, when the convex engagement pieces a and a ′ having an arc width of 90 ° are elastically deformed and brought into contact with the screw threads of the bolts, both ends on the protruding side of the convex engagement pieces a and a ′ The corners are forced to elastically deform while screwing into the screw threads. As a result, the convex engagement pieces a and a ′ are difficult to smoothly enter between the screw threads of the bolt, and there is a problem that workability is poor. Moreover, the projecting side end corners of the projecting engagement pieces a and a ′ are liable to damage the screw thread of the bolt, and it is a major disadvantage that it causes corrosion and seizure due to plating peeling. is there. Moreover, if the screw thread of the bolt is damaged by the projecting side end corners of the convex engagement pieces a, a ′, there is a problem that the reuse becomes impossible. There was also a problem that the plating could cause corrosion due to peeling or burnt, making it impossible to reuse.

そこで、本発明は、ゆるみ止めナットにおける弾性ワッシャーの凸状係合部片の突出側角部の形状を工夫することにより、ボルトに容易にねじ込めるようにして、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、鍍金はがれによる腐食の防止、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 aims to improve workability by easily screwing into the bolt by devising the shape of the protruding corner portion of the convex engaging portion piece of the elastic washer in the locking nut, It is an object of the present invention to develop a locking nut that is difficult to damage the screw thread of the bolt, prevents corrosion due to plating peeling, prevents seizure, and reliably maintains the locking effect of the nut by the convex engagement piece.

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たゆるみ止めナットにおいて、弾性ワッシャーの内周面に、半径方向内方に突出しかつその突出内周面がねじ孔の内径とほぼ同径の円弧状に形成された複数個の凸状係合部片と、内面がねじ孔の谷径よりも大径の円弧状に形成された複数個の切欠凹部とが交互に形成されている一方、複数の凸状係合部片におけるすべての突出先端部分である突出周縁部に上方に向って湾曲する湾曲案内部が形成されていると共に、各湾曲案内部は凸状係合部片の一側端から他側端までの突出内周端全周にわたって連続して形成され、かつ、すべての湾曲案内部は側面視において同一高さで同一端面形状を呈するように形成されてい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. In a locking nut with a flat elastic washer fixed by caulking, the inner surface of the elastic washer protrudes radially inward and the protruding inner surface is formed in an arc shape having substantially the same diameter as the inner diameter of the screw hole. On the other hand, a plurality of convex engagement pieces are formed alternately with a plurality of cutout recesses whose inner surface is formed in an arc shape having a diameter larger than the valley diameter of the screw hole. A curved guide portion that curves upward is formed at the projecting peripheral edge portion that is all the projecting tip portions of the pieces, and each curved guide portion is from one side end to the other side end of the convex engagement piece. Is formed continuously over the entire circumference of the protruding inner peripheral edge, and all Curved guide unit is characterized by being formed to exhibit the same end face shape at the same height as viewed from the side.

本願の請求項記載の発明は、請求項1記載の構成において、弾性ワッシャーの内周面に形成される複数の凸状係合部片が、その円弧幅の角度を互いに異ならしめて形成されていることを特徴とする。The invention according to claim 2 of the present application is the configuration according to claim 1, wherein the plurality of convex engaging pieces formed on the inner peripheral surface of the elastic washer are formed with their arc width angles different from each other. It is characterized by being.

本願の請求項記載の発明は、請求項1又は請求項2記載の構成において、弾性ワッシャーの内周面に形成される複数の切欠凹部が、その円弧幅の角度を互いに異ならしめて形成されており、これにより隣り合う凸状係合部片の形成位置に変化を付け、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 3 of the present application, in the configuration according to claim 1 or claim 2, the plurality of cutout recesses formed on the inner peripheral surface of the elastic washer are formed by making the arc width angles different from each other. Thus, the formation position of the adjacent convex engagement piece is changed, and the torque at the time of screwing is reduced or increased.

本願の請求項1記載の発明によれば、ゆるみ止め用の平板状弾性ワッシャーにおける複数の凸状係合部片のすべての突出先端部分である突出周縁部に上方に向って湾曲する湾曲案内部が形成されていると共に、各湾曲案内部は凸状係合部片の一側端から他側端までの突出内周端全周にわたって連続して形成され、かつ、すべての湾曲案内部は側面視において同一高さで同一端面形状を呈するように形成されているから、それぞれの凸状係合部片をボルトのねじ山の間に入り込ませる際、上方に向って湾曲する湾曲案内部により積極的に誘導してねじ山の間に入り込ませることができる。その結果、凸状係合部片の突出側角部がねじ山に突き当り、その突き当った状態のままでねじ山の間に入り込んで行くといったことが解消されるばかりか、この湾曲案内部の湾曲面に誘導されて凸状係合部片はボルトのねじ山の間にスムーズにねじ込まれることになる。したがって、螺入作業を著しく高めることができ、しかも、凸状係合部片の突出側角部がボルトのねじ山を傷つけてしまうのを防止できるとともに、傷部からの腐食および焼き付を防止ことができる。その上、凸状係合部片の突出側角部によりボルトのねじ山を損傷させてしまうことがないので、ボルト及びゆるみ止めナットの再使用も可能になる。According to the invention described in claim 1 of the present application, the curved guide portion that curves upward to the protruding peripheral edge portion that is the protruding tip portion of all of the plurality of convex engaging portion pieces in the flat elastic washer for preventing loosening. Each curved guide portion is formed continuously over the entire circumference of the protruding inner peripheral end from one side end to the other side end of the convex engagement piece piece, and all the curved guide portions are in side view. Since it is formed so as to exhibit the same end face shape at the same height, when the respective convex engaging pieces are inserted between the screw threads of the bolt, the curved guide portions that are curved upward are more actively used. It can be guided to get in between the threads. As a result, the protruding side corner portion of the convex engagement piece hits the screw thread, and it is not only eliminated that the protruding engagement corner piece enters the screw thread while being in the bumped state. The convex engagement piece is guided into the curved surface and is smoothly screwed between the bolt threads. Therefore, the screwing operation can be remarkably enhanced, and the protrusion side corners of the convex engagement piece can be prevented from damaging the screw thread of the bolt, and corrosion and seizure from the wound can be prevented. be able to. In addition, since the screw thread of the bolt is not damaged by the protruding side corner of the convex engagement piece, the bolt and the locking nut can be reused.

また、本願の請求項記載の発明によれば、上述した効果に加えて、例えばゆるみ止め用の平板状弾性ワッシャーにおける2個の第1凸状係合部片と第2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り、斯かる特異な形状による効果と、上記した湾曲案内部による効果との相乗効果が得られて一層作業を高めることができ、加えてボルトのねじ山を傷つけにくくするとともに、傷部からの腐食および焼き付を抑えることができる。したがって、上述した湾曲案内部による効果との相乗効果が得られて一層作業を高めることができる。
Further, according to the invention described in claim 2 of the present application, in addition to the above-described effect, for example, two first convex engagement portions and a second convex engagement portion in a flat elastic washer for preventing loosening. Among the pieces, a large contact area and a large shaft can be obtained by widening the angle of the first convex engagement portion piece that generates a pre-belting torque that prevents natural rotation by strongly pressing the screw thread while being elastically deformed. The screw thread of the bolt can be strongly pressed by the amount of deformation in the 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 flat elastic washer to be thin, it is possible to enter it while being easily elastically deformed even by manual work. A synergistic effect with the effect can be obtained, and the work can be further enhanced. In addition, the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed. Therefore, a synergistic effect with the above-described effect of the curved guide portion can be obtained, and the work can be further enhanced.

また、本願の請求項記載の発明によれば、上述した湾曲案内部による効果に加えて、例えばゆるみ止め用の平板状弾性ワッシャーにおける2個の第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、凸状係合部片の湾曲案内部や、凸状係合部片の角度、及び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る。Further, according to the invention described in claim 3 of the present application, in addition to the effect of the curved guide portion described above, for example, two first concave notch portions and second concave notch portions in a flat elastic washer for preventing loosening. By adopting a configuration in which the arc width is made different, it is possible to reduce or increase the torque at the time of screwing by changing the formation position of the first convex engagement portion piece with respect to the second convex engagement portion piece. 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, by changing the formation position of the convex engagement piece in addition to the curved guide part of the convex engagement piece, the angle of the convex engagement piece, and the thickness of the elastic washer, Work can be significantly enhanced.

本発明に係るゆるみ止めナットの平面図である。It is a top view of the locking nut which concerns on this invention. 同ナットの一部切欠正面図である。It is a partially cutaway front view of the nut. 平板状弾性ワッシャーの平面図である。It is a top view of a flat elastic washer. 図3のA−A線拡大断面図である。It is an AA line expanded sectional view of FIG. 使用状態を示す断面図である。It is sectional drawing which shows a use condition. 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. 図6のB−B線拡大断面図である。FIG. 7 is an enlarged sectional view taken along line B-B in FIG. 6. 同じく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. 同じく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. 同じく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. 同じく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. 同じく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. 同じく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. 同じく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. 同じく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. 同じく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. 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. 図17のC−C線拡大断面図である。It is the CC sectional view taken on the line of FIG.

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及び図2は、本発明に係るゆるみ止めナットを示し、このゆるみ止めナット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)などを設けてもよい。  1 and 2 show a locking nut according to the present invention. The locking nut N includes a nut main body 1 having a screw hole 1a penetrating in the axial direction in the center, and an upper surface of the nut main body 1. And a plate-like elastic washer 2 that is crimped. 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) or the like 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、本発明の平板状弾性ワッシャー2では、図3及び図4に示されているように、第1、2第凸状係合部片21,22の各両側端から突出内周端の全周にわたり上方に向って湾曲する湾曲案内部21a、22aがそれぞれ形成されている。この湾曲案内部21a、22aは、その湾曲形状の特性を生かして凸状係合部片21,22を後記するボルト3のねじ山3aの間に入り込ませるとき、或いはボルト3からゆるみ止めナットNを取外すときに、第1、2第凸状係合部片21,22の突出側両端角部がねじ山3aに突き当らないようにするとともに積極的に誘導してねじ山の間にスムーズに入り込ませ、かつ、ねじ山の間をスムーズに移動させるためのものである。  And, in the flat elastic washer 2 of the present invention, as shown in FIGS. 3 and 4, the entire projecting inner peripheral end from each side end of the first and second convex engaging pieces 21, 22 is shown. Curvature guide portions 21a and 22a that are curved upward are formed around the circumference. The curved guide portions 21a and 22a make use of the characteristics of the curved shape to allow the convex engaging pieces 21 and 22 to enter between the screw threads 3a of the bolt 3 described later, or from the bolt 3 to prevent the loosening nut N. When removing the first and second projecting engagement pieces 21 and 22, the protruding side end corners are prevented from abutting against the thread 3 a and are actively guided to smoothly move between the threads. It is for entering and moving smoothly between the threads.

ここで、図1〜5に示す実施例では、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。  Here, in the embodiment shown in FIGS. 1 to 5, one of the first and second convex engaging portion pieces 21 and 22 is one first convex engaging portion piece 21 and the other second convex engaging portion. The angle is 180 ° larger than that of the piece 22 and formed into a convex engagement piece having a wide arc width, and the other second convex engagement piece 22 has a small angle of 90 ° and a narrow arc width. It is formed on the convex engagement piece. 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.

また、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。  Further, the thickness of the flat elastic washer 2 is formed to be thinner than the thickness of the conventional elastic washer, so that the convex engaging parts 21 and 22 can be easily inserted between the bolt threads by hand. It is possible to make it. 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止めす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. The 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 fixed to the bottom surface of the counterbored hole by caulking the peripheral wall of the counterbore hole. The

次に、以上のように構成するゆるみ止めナットの作用について説明する。  Next, the operation of the locking nut configured as described above will be described.

使用時には、図5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、弾性ワッシャー2における第1凸状係合部片21と第2凸状係合部片22の各両側端から突出内周端の全周にわたり上方に向って湾曲する湾曲案内部21a、22aが形成されているから、第1、第2凸状係合部片21,22をボルト3のねじ山3aの間に入り込ませる際、上方に向って湾曲する湾曲案内部21a、22aにより積極的に誘導してねじ山の間に入り込ませることができる。その結果、従来のように第1、第2凸状係合部片21,22の突出側角部がねじ山3aに突き当り、その突き当った状態のままでねじ山の間に入り込んで行くといったことが解消されるばかりか、この湾曲案内部21a、22aの湾曲面に誘導されて第1、第2凸状係合部片21,22はボルト3のねじ山3aの間にスムーズにねじ込まれることになる。したがって、螺入作業を著しく高めることができ、しかも、第1、第2凸状係合部片21,22の突出側角部がボルト3のねじ山3aを傷つけてしまうのを防止できるとともに、傷部からの腐食および焼き付を防止ことができる。その上、第1、第2凸状係合部片21,22の突出側角部によりボルト3のねじ山3aを損傷させてしまうことがないので、ボルト3及びゆるみ止めナットNの再使用も可能になる。  At the time of use, as shown in FIG. 5, a 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. During the screwing, the curved guide that curves upward from the both side ends of the first convex engaging piece 21 and the second convex engaging piece 22 of the elastic washer 2 over the entire circumference of the protruding inner peripheral end. Since the portions 21a and 22a are formed, when the first and second convex engaging pieces 21 and 22 are inserted between the screw threads 3a of the bolt 3, the bending guide portions 21a that bend upward are provided. It can be actively guided by 22a so as to enter between the threads. As a result, the protruding side corners of the first and second convex engaging pieces 21 and 22 hit the screw thread 3a as in the prior art, and enter between the screw threads in the abutted state. The first and second convex engaging pieces 21 and 22 are smoothly screwed between the screw threads 3a of the bolt 3 by being guided by the curved surfaces of the curved guide portions 21a and 22a. It will be. Therefore, the screwing operation can be remarkably enhanced, and the protruding side corners of the first and second convex engaging pieces 21 and 22 can be prevented from damaging the thread 3a of the bolt 3. Corrosion and seizure from scratches can be prevented. In addition, since the thread 3a of the bolt 3 is not damaged by the protruding side corners of the first and second convex engaging pieces 21, 22, the bolt 3 and the locking nut N can be reused. It becomes possible.

また、図1〜5に示す実施例では、第1凸状係合部片21の円弧幅の角度を180°と第2凸状係合部片22の円弧幅の角度を90°よりも大きく取り、かつ、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の円弧幅の角度をそれぞれ45°に形成しているので、その特異な形状により上述した湾曲案内部21a、22aによる効果に加え、次のような手作業で容易に螺入することができる。  Moreover, in the Example shown in FIGS. 1-5, the angle of the circular arc width of the 1st convex engagement part piece 21 is larger than 180 degrees, and the angle of the circular arc width of the 2nd convex engagement part piece 22 is larger than 90 degrees. And the angle of the arc width of the first and second concave cutouts 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 is 45 respectively. Therefore, in addition to the effects of the curved guide portions 21a and 22a described above due to its unique shape, it can be easily screwed in by the following manual operation.

先ず、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。  First, by using the first concave notch 23 of the flat elastic washer 2 thinned manually, the second convex engagement piece 22 is searched for the rise of the screw 3a of the bolt 3, and from this rise the first The two convex engaging piece 22 is inserted between the threads and screwed. 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。  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.

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り、斯かる特異な形状による効果と、上記した湾曲案内部21a、22aによる効果との相乗効果が得られて一層作業を高めることができる。  Therefore, by setting the thickness of the flat elastic washer to be thin, it is possible to enter it while being easily elastically deformed even by manual work. The effect of such a unique shape and the curved guide portion 21a described above can be obtained. , 22a and a synergistic effect can be obtained, and the work can be further enhanced.

また、平板状弾性ワッシャー2の凸状係合部片及び凹状切欠部の各円弧幅や、個数は、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、適宜選択して形成してもよい。  Further, the arc width and the number of the convex engaging piece and the concave notch of the flat elastic washer 2 are not limited to those of the above-described embodiment, and the type and size of the bolt to be used. Or you may form by selecting suitably according to a use etc.

たとえば、図6及び図7に示すように、従来のものと同様に平板状弾性ワッシャー2における第1、2第凸状係合部片21,22と第1.第2凹状切欠部23,24とをそれぞれ90°の等間隔の円弧幅で交互に形成してもよい。  For example, as shown in FIGS. 6 and 7, the first and second convex engaging portions 21 and 22 in the flat elastic washer 2 and the first. The second concave notches 23 and 24 may be alternately formed with arc widths of equal intervals of 90 °.

また、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 first convex engagement piece 21 is formed in an arc width in the range of 150 ° to 240 °, and the other second convex engagement piece 22 is formed in an arc width in the range of 60 ° to 90 °. Further, the first and second concave cutout portions 23 and 24 interposed between the first convex engagement portion piece 21 and the second convex engagement portion piece 22 are arcs in the range of 30 ° to 60 °, respectively. The width may be selected as appropriate.

具体的には、図8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9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、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11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12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. 8, 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 cutouts 23 and 24 is formed to 60 °, or the arc width of the first convex engagement 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 cutouts 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. 11, 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 The arcuate widths of the notches 23 and 24 are formed to 60 °, and the arcuate width of the first convex engagement piece 21 is increased to 240 ° as shown in FIG. The arcuate width of the engagement piece 22 may be 60 °, and the arc widths of the first and second concave cutouts 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、斯かる特異な形状による効果と、上記した湾曲案内部21a、22aによる効果との相乗効果が得られて一層作業を高めることができ、加えてボルトのねじ山を傷つけにくくするとともに、傷部からの腐食および焼き付を抑えることができる。  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, the locking nut N can be screwed into the bolt by hand more easily according to the type, size, or application of the bolt to be used. The effect of such a unique shape and the above-described curved guide portion 21a, A synergistic effect with the effect of 22a can be obtained, and the work can be further enhanced. In addition, the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed.

さらに、第1、第2凹状切欠部23,24の円弧幅は上述した実施の形態のように同一円弧幅に限定されるものではなく、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、他方の切欠凹部に比べて円弧幅の広い切欠凹部に形成してもよい。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生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してもよい。  Furthermore, the arc width of the first and second concave notches 23 and 24 is not limited to the same arc width as in the above-described embodiment, and the first notch recess 23 and the second notch recess 24 are Either one of the notch recesses may be formed in a notch recess having a larger angle than the other notch recess and having a larger arc width than the other notch recess. This changes the formation position in the circumferential direction of the first convex engagement part piece 21 with respect to the second convex engagement part piece 22, and reduces the torque at the time of screwing by making use of the characteristics depending on the formation position, Or you may make it increase.

具体的には、例えば図13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14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. 13, 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. 14, the arc width of the first convex engaging piece 21 is increased to 150 ° and the arc width of the second convex engaging 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、上記した湾曲案内部21a、22aによる効果との相乗効果が得られてさらに作業を高めることができ、かつ、ボルトのねじ山を傷つけにくくするとともに、傷部からの腐食および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 curved guide portions 21a and 22a are changed 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 2 for preventing loosening. As a result, the work can be further enhanced, and the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed.

また、上記したように2個の凸状係合部片及び凹状切欠部を特異な形状に形成する場合、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。  As described above, when the two convex engaging pieces and the concave notch are formed in a unique shape, the thickness of the flat elastic washer 2 is, for example, the plate thickness of a 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 0.2 mm, the plate thickness is reduced to 0.15 mm, or the conventional plate elastic If the plate thickness of the washer is 0.15 mm, the plate thickness is reduced to 0.1 mm.

一方、平板状弾性ワッシャー2の凸状係合部片及び凹状切欠部の個数としては、たとえば、図15及び図16に示すように、弾性ワッシャー2における凸状係合部片と凹状切欠部とをそれぞれ3個としてもよいことは勿論である。  On the other hand, as the number of the convex engagement portion pieces and the concave cutout portions of the flat elastic washer 2, for example, as shown in FIGS. 15 and 16, the convex engagement piece pieces and the concave cutout portions in the elastic washer 2 are used. Of course, it is possible to use three each.

図15に示すものは、3個の凸状係合部片21,22,21´と、3個の凹状切欠部23,24,23´の各円弧幅をそれぞれ60°として、両者を等間隔で交互に形成したものであり、また、図16に示すものは3個の凸状係合部片21,22,21´の円弧幅を90°に形成し、また3個の凹状切欠部23,24,23´の各円弧幅をそれぞれ30°に形成したものである。
このように凸状係合部片及び凹状切欠部の個数を3個とした場合においても、各凸状係合部片21,22,21´に形成した湾曲案内部21a,22a、21´aにより、上述した実施例の場合と同様の優れた作用効果が得られる。
FIG. 15 shows that the three arcuate engagement portions 21, 22, 21 ′ and the three concave notches 23, 24, 23 ′ are each 60 ° in arc width, and they are equally spaced from each other. In FIG. 16, the three convex engaging portions 21, 22, 21 ′ are formed with an arc width of 90 °, and the three concave cutouts 23 are formed. , 24, and 23 'are formed at 30 ° arc widths.
Thus, even when the number of the convex engagement part pieces and the concave notch parts is three, the curved guide parts 21a, 22a, 21'a formed on the respective convex engagement part pieces 21, 22, 21 '. Thus, the same excellent effects as those of the above-described embodiment can be obtained.

なお、湾曲案内部21a、22a及び21´aは、上記した各種の実施例のように第1、2第凸状係合部片21,22の各両側端から突出内周端の全周にわたって上方に向うよう湾曲形成する他、例えば第1、2第凸状係合部片21,22の両端角部分から突出内周端に連続して形成するようにしてもよいこと勿論である。  The curved guide portions 21a, 22a, and 21'a extend from the both side ends of the first and second convex engaging pieces 21 and 22 to the entire circumference of the protruding inner peripheral end as in the various embodiments described above. Of course, in addition to forming a curve so as to face upward, for example, the first and second convex engagement pieces 21 and 22 may be formed continuously from the both corners to the projecting inner peripheral edge.

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 弾性ワッシャー
21 第1凸状係合部片
21a 湾曲案内部
21´ 凸状係合部片
21´a 湾曲案内部
22 第2凸状係合部片
22a 湾曲案内部
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 Elastic washer 21 First convex engagement portion piece 21a Curved guide portion 21 'Convex engagement portion piece 21'a Curved guide portion 22 Second convex engagement Joint piece 22a Curved guide portion 23 First concave notch 24 Second concave notch

Claims (3)

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たゆるみ止めナットにおいて、弾性ワッシャーの内周面に、半径方向内方に突出しかつその突出内周面がねじ孔の内径とほぼ同径の円弧状に形成された複数個の凸状係合部片と、内面がねじ孔の谷径よりも大径の円弧状に形成された複数個の切欠凹部とが交互に形成されている一方、複数の凸状係合部片におけるすべての突出先端部分である突出周縁部に上方に向って湾曲する湾曲案内部が形成されていると共に、各湾曲案内部は凸状係合部片の一側端から他側端までの突出内周端全周にわたって連続して形成され、かつ、すべての湾曲案内部は側面視において同一高さで同一端面形状を呈するように形成されてい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 body, in which a screw hole penetrating in the axial direction is formed at the center, and a flat elastic washer is caulked and fixed concentrically with the screw hole inside the caulking portion. In the locking nut, a plurality of convex engaging pieces protruding radially inwardly on the inner peripheral surface of the elastic washer and having the protruding inner peripheral surface formed in an arc shape having substantially the same diameter as the inner diameter of the screw hole, The plurality of notch recesses formed in an arc shape whose inner surface is formed in an arc shape larger than the valley diameter of the screw hole are alternately formed, and are all projecting tip portions of the plurality of projecting engagement pieces. A curved guide portion that curves upward is formed at the protruding peripheral edge portion, and each curved guide portion is continuously formed over the entire circumference of the protruding inner peripheral end from one end of the convex engagement piece to the other end. And all curved guides are in side view Locking nut, characterized in that it is formed to exhibit the same end face shape in one height. 弾性ワッシャーの内周面に形成される複数の凸状係合部片が、その円弧幅の角度を互いに異ならしめて形成されていることを特徴とする請求項1記載のゆるみ止めナット。  2. The locking nut according to claim 1, wherein the plurality of convex engaging pieces formed on the inner peripheral surface of the elastic washer are formed with different arc width angles. 弾性ワッシャーの内周面に形成される複数の切欠凹部が、その円弧幅の角度を互いに異ならしめて形成されており、これにより隣り合う凸状係合部片の形成位置に変化を付け、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請求項1又は請求項2記載のゆるみ止めナット。  A plurality of cutout recesses formed on the inner peripheral surface of the elastic washer are formed with different arc width angles, thereby changing the formation position of adjacent convex engagement pieces, and when screwing The loosening prevention nut according to claim 1 or 2, wherein the torque is reduced or increased.
JP2014249337A 2014-11-20 2014-11-20 Locking nut Active JP6347367B2 (en)

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US1515657A (en) * 1923-03-09 1924-11-18 Charles R Cochran Nut lock
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