JP2018197607A

JP2018197607A - Locking nut

Info

Publication number: JP2018197607A
Application number: JP2018107267A
Authority: JP
Inventors: 芳昭奥野; Yoshiaki Okuno
Original assignee: OSAKA FORMING KK
Current assignee: OSAKA FORMING KK
Priority date: 2017-05-22
Filing date: 2018-05-17
Publication date: 2018-12-13
Anticipated expiration: 2038-05-17
Also published as: JP6809669B2

Abstract

To provide a locking nut effectively suppressing variation of a prevailing torque, and having such high reliability as to obtain a demanded stable locking effect always and accurately.SOLUTION: A locking nut comprises a hexagonal nut body 3 having a screw hole 2 in the center part, and a cylindrical boss 5 integrally connected upward from the nut body 3 and having a screw hole 4 continuing to the screw hole 2 of the nut body 3 in the center part. The cylindrical boss 5 is formed more thinly and evenly than the nut body 3, and the tip three portions of the cylindrical boss 5 are deformed by pressing inwardly from the outer periphery by two pitches from the tip, and simultaneously, a screw hole diameter and a screw hole pitch are deformed so as to form deformation parts 6...6 for causing a pitch error.SELECTED DRAWING: Figure 1

Description

本発明は、ナットのボルトへの締結時、プリベリングトルクを増大させてゆるみ止めを行う機能を備えたゆるみ止めナットに関する。 The present invention relates to a locking nut having a function of increasing the pre-belting torque to prevent locking when the nut is fastened to the bolt.

従来、この種のゆるみ止めナットとしては、例えば６角ナットの６面のうち、一つ飛ばしの３面の上部３ヶ所に、外周から内方に向ってカシメを施して３個のカシメ部を形成したものが知られている。 Conventionally, as this kind of locking nut, for example, three of the six faces of a hexagon nut are caulked from the outer periphery inward to three upper portions of three faces, and three caulking portions are provided. What is formed is known.

この３個のカシメ部を有するナットによれば、これのボルトへの締結時、ナットのカシメ部が、ボルトのねじ山にかかる圧力によって生ずるプリベリングトルク（摩擦トルク）を増大させ、ゆるみ止め効果を発生させるようになされている。 According to the nut having these three caulking portions, when the bolt is fastened to the bolt, the caulking portion of the nut increases the pre-ringing torque (friction torque) generated by the pressure applied to the screw thread of the bolt, thereby preventing the loosening effect. Has been made to generate.

ところで、上記した従来のゆるみ止めナットは、６角ナットの６面のうち、一つ飛ばしの３面の上部３ヶ所に、外周から内方に向ってカシメを施す構成であるため、そのカシメを施す際に、ナットの６角面形状や、カシメ部分の厚さが厚いといったことなどの影響を直接受けることになり、求めるカシメ部を簡単容易にかつ高精度に形成しづらいものであった。そのため、プリベリングトルクにバラツキが生ずることがあった。 By the way, the conventional locking nut described above is configured to caulk inward from the outer periphery to the upper three places of one of the six faces of the hexagonal nut. When applied, it is directly affected by the hexagonal shape of the nut and the thickness of the caulking portion, and the caulking portion to be obtained is difficult to form easily and with high accuracy. For this reason, the pre-leveling torque may vary.

また、カシメ部を形成するに際し、６角ナットの６面のうち、一つ飛ばしの３面をカシメ基準面とし、その各上部で中央位置に、それぞれカシメを施す構成であることから、６角ナットのねじ孔の切り上がり位置（立ち上がり位置）とカシメ部との位置関係については全く無関係の状態でカシメ部が形成されている。そのため、多数製造されるそれぞれのナットごとにおいて、６角ナットのねじ孔の切り上がり位置に対する３個のカシメ部の配置関係が全くバラバラに形成されることになる。その結果、ナットごとでねじ孔の切り上がり位置と３個のカシメ部との配置関係が異なることによっても、各ナットのボルトに対するプリベリングトルクにバラツキが発生し、より一層求める安定したゆるみ止め効果が得られにくいものであった。 Further, when forming the crimping portion, among the six surfaces of the hexagon nut, one of the three skipped surfaces is used as a crimping reference surface, and the upper portion of each of the hexagonal nuts is caulked at the center position. The caulking portion is formed in a completely unrelated state with respect to the positional relationship between the threaded position (rise position) of the nut screw hole and the caulking portion. Therefore, for each of the many manufactured nuts, the arrangement relationship of the three crimping portions with respect to the position where the hexagonal nut screw hole is rounded up is completely formed. As a result, even if the arrangement relationship between the screw hole round-up position and the three caulking portions differs for each nut, the prevailing torque for the bolts of each nut will vary, and the stable loosening prevention effect that is further required Was difficult to obtain.

そこで本発明は、上記した問題を解決するため、ゆるみ止めナットの形状を工夫してボルトのねじ山に圧力をかける圧縮変形部を簡単容易にかつ高精度に形成できるようにし、また、ねじ孔の切り上がり位置に対する圧縮変形部の配置関係を常に一定の位置に設定してプリベリングトルクのバラツキを効果的に抑え、求める安定したゆるみ止め効果が常に正確に得られる信頼度の高いゆるみ止めナットの提供を課題とする。 Therefore, in order to solve the above-mentioned problems, the present invention makes it possible to easily and accurately form a compression deformed portion that applies pressure to the screw thread of the bolt by devising the shape of the locking nut, A highly reliable locking nut that always sets the relationship of the compression deformation part to the rounded-up position at a constant position and effectively suppresses variation in pre-torque torque, and always provides the required stable locking effect. The issue is to provide

本願の請求項１記載の発明は、中心部にねじ孔を有する多角形のナット本体と、ナット本体の上面から上方に一体に連設されかつ中心部にナット本体のねじ孔に連続するねじ孔を有する円筒状ボスとを備え、円筒状ボスはその肉厚がナット本体の肉厚よりも薄く形成されていると共に、円筒状ボスの先端に、その全周、又は複数箇所をプレスによってねじ孔の外周から内方に変形させると同時にそのねじ孔径及びねじ孔ピッチを変形させてなる圧縮変形部が形成されており、ナット本体のボルトへの螺合時、円筒状ボスの圧縮変形部によりボルトのねじ山に圧力をかけることによってプリベリングトルクを増大させゆるみ止め機能を持たせるように構成したことを特徴とする。 The invention according to claim 1 of the present application is a polygonal nut body having a screw hole at the center, and a screw hole that is integrally connected upward from the upper surface of the nut body and that is continuous with the screw hole of the nut body at the center. The cylindrical boss has a thickness that is thinner than the thickness of the nut body, and the entire circumference of the cylindrical boss or a plurality of places are screwed into the screw holes by pressing. A compression deformation portion is formed by deforming the screw hole diameter and screw hole pitch at the same time as the deformation from the outer periphery of the nut to the bolt, and when the nut body is screwed to the bolt, the compression deformation portion of the cylindrical boss The present invention is characterized in that the pressure is applied to the screw thread to increase the preveling torque and to have a locking function.

本願の請求項２記載の発明は、請求項１記載の発明において、円筒状ボスにおける圧縮変形部が複数個形成されており、かつ、これらの圧縮変形部がボスの周方向に等角度づつ間隔をおいてそれぞれ形成されている一方、これら複数個の圧縮変形部のプレスによる成形時、複数個の圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置、又は常にねじ孔の切り上がり位置に対して一定角度離れた設定位置に位置するように位置設定され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 invention according to claim 1, wherein a plurality of compressive deformation portions in the cylindrical boss are formed, and these compression deformation portions are spaced equiangularly in the circumferential direction of the boss. Each of the plurality of compression deformation portions is formed by pressing, and one compression deformation portion of the plurality of compression deformation portions is always at the position where the screw hole is raised or always screw hole. It is characterized in that the position is set so as to be located at a set position that is a predetermined angle away from the round-up position.

本願の請求項３記載の発明は、請求項１記載の発明において、円筒状ボスにおける圧縮変形部が３個形成されており、かつ、これらの圧縮変形部がボスの周方向に１２０度づつ間隔をおいてそれぞれ形成されて円筒状ボスの先端が平面視三角形状を呈している一方、これら３個の圧縮変形部のプレスによる成形時、３個の圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置に位置するように位置設定されて形成されていることを特徴とする。 The invention according to claim 3 of the present application is the invention according to claim 1, wherein three compression deformation portions in the cylindrical boss are formed, and these compression deformation portions are spaced by 120 degrees in the circumferential direction of the boss. And the tip of the cylindrical boss has a triangular shape in plan view, while one of the three compression deformation parts is formed by pressing the three compression deformation parts. Is formed so as to be always positioned at the position where the screw hole is cut up.

本願の請求項４記載の発明は、請求項１又は請求項２又は請求項３記載の発明において、圧縮変形部は、円筒状ボスの先端をプレスによってねじ孔の２ピッチ分外周から内方に変形させると同時にそのねじ孔径及びねじ孔ピッチを変形させることにより形成されていることを特徴とする。 The invention according to claim 4 of the present application is the invention according to claim 1, claim 2, or claim 3, wherein the compression deformable portion is pressed inward from the outer periphery by two pitches of the screw hole by pressing the tip of the cylindrical boss. It is formed by changing the screw hole diameter and screw hole pitch simultaneously with the deformation.

本願の請求項５記載の発明は、中心部にねじ孔を有する多角形のナット本体における上面のねじ孔周りに、プレスによりねじ孔上端を下方側に変形させてそのねじ孔ピッチを変形させてなる圧縮変形部が複数個形成されており、かつ、これらの圧縮変形部がねじ孔の周方向に等角度づつ間隔をおいてそれぞれ形成されている一方、これら圧縮変形部のプレスによる成形時、これら圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置、又は常にねじ孔の切り上がり位置に対して一定角度離れた設定位置に位置するように位置設定されて形成されていることを特徴とする。 In the invention according to claim 5 of the present application, the upper end of the screw hole is deformed downward by a press around the upper screw hole in the polygonal nut main body having a screw hole at the center, and the screw hole pitch is changed. A plurality of compression deformation portions are formed, and these compression deformation portions are formed at equal intervals in the circumferential direction of the screw hole, respectively, while these compression deformation portions are formed by pressing, Among these compression deformation portions, one compression deformation portion is always positioned and formed so as to be located at a set position that is always at a certain angle away from the screw hole's up-cut position or always at the screw hole's up-cut position. It is characterized by being.

本願の請求項６記載の発明は、請求項５記載の発明において、圧縮変形部が３個形成されており、かつ、これらの圧縮変形部がねじ孔の周方向に１２０度づつ間隔をおいてそれぞれ形成されている一方、これら３個の圧縮変形部のプレスによる成形時、これら３個の圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置に位置するように位置設定されて形成されていることを特徴とする。 The invention according to claim 6 of the present application is the invention according to claim 5, wherein three compression deformation portions are formed, and these compression deformation portions are spaced apart by 120 degrees in the circumferential direction of the screw hole. On the other hand, when these three compression deformation parts are formed by pressing, the position is set so that one of the three compression deformation parts is always located at the position where the screw hole is raised. It is characterized by being formed.

上記した本発明の請求項１記載のゆるみ止めナットの構成によれば、ナット本体にこれの上面から上方に一体に連設されかつ中心部にナット本体のねじ孔に連続するねじ孔を有する薄肉の円筒状ボスを突設し、この円筒状ボスに圧縮変形部をプレスにより形成するようにしたから、従来のゆるみ止めナットのように６角面ナット本体の形状やナット本体の肉厚などに何ら影響されることなく、薄肉で均一の円筒状ボスにプレスによる圧縮変形部を簡単容易にかつ正確に成形することができる。また、円筒状ボスの先端に、その全周、又は複数箇所をプレスによってねじ孔の外周から内方に変形させると同時にそのねじ孔径及びねじ孔ピッチを変形させてピッチエラーを起こさせる圧縮変形部が形成されているから、ナット本体のボルトへの螺合時、円筒状ボスの圧縮変形部によりボルトのねじ山に圧力をかけることによってプリベリングトルクを増大させゆるみ止めの機能を十分に発揮することができる。 According to the above-described configuration of the locking nut according to the first aspect of the present invention, the thin-walled nut having a screw hole that is integrally connected to the nut body upward from the upper surface thereof and that is continuous with the screw hole of the nut body. Since the cylindrical boss is protruded and a compression deformation part is formed on the cylindrical boss by pressing, the shape of the hexagonal nut body, the thickness of the nut body, etc., as in the conventional locking nut Without being affected at all, it is possible to easily and accurately form a compression deformed portion by pressing on a thin and uniform cylindrical boss. In addition, a compression deformation part that causes a pitch error by deforming the screw hole diameter and screw hole pitch at the same time by deforming the entire circumference or a plurality of locations at the tip of the cylindrical boss from the outer circumference of the screw hole by pressing. When the nut body is screwed onto the bolt, the preloading torque is increased by applying pressure to the screw thread of the bolt by the compression deformation part of the cylindrical boss, and the function of locking prevention is fully exhibited. be able to.

また、本発明の請求項２記載のゆるみ止めナットの構成によれば、上記した請求項１記載の効果と同様の効果が得られると共に、円筒状ボスの周方向に等角度づつ間隔をおいて形成される複数個の圧縮変形部がプレスにより成形される時、複数個の圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置、又は常にねじ孔の切り上がり位置に対して一定角度離れた設定位置に位置するように位置設定されて形成されているから、そのねじ孔の切り上がり位置に対して一つの圧縮変形部が常に一致した位置関係、又は切り上がり位置に対して常に一定角度離れた位置関係となるゆるみ止めナットが形成されることになる。これにより多数製造されるそれぞれのゆるみ止めナットにおいて、複数個の圧縮変形部のボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Further, according to the structure of the locking nut according to claim 2 of the present invention, the same effect as the effect of claim 1 described above can be obtained, and at intervals of equal angles in the circumferential direction of the cylindrical boss. When a plurality of formed compression deformation portions are formed by pressing, one compression deformation portion among the plurality of compression deformation portions is always relative to the screw hole up-cut position or the screw hole up-cut position. Since the position is set so as to be located at a set angle apart by a certain angle, the positional relationship in which one compression deformation part always matches the cut-up position of the screw hole, or the cut-up position. Thus, a locking nut that is always in a positional relationship separated by a certain angle is formed. As a result, in each of the many locking nuts manufactured in this way, it is possible to keep the variation of the pre-baling torque with respect to the screw threads of the bolts of the plurality of compression deformed parts with high accuracy, and to always act stably, and the reliability is always high. A locking nut is obtained.

また、本発明の請求項３記載のゆるみ止めナットの構成によれば、上記した請求項１記載の効果と同様の効果が得られると共に、円筒状ボスにおける圧縮変形部が３個形成されており、かつ、これらの圧縮変形部がボスの周方向に１２０度づつ間隔をおいてそれぞれ形成されて円筒状ボスの先端が平面視三角形状を呈している一方、３個の圧縮変形部がプレスにより成形される時、３個の圧縮変形部のうち、一つの圧縮変形部が常に円筒状ボスにおけるねじ孔の切り上がり位置に一致するように位置設定されて形成されているから、そのねじ孔の切り上がり位置に対して一つの圧縮変形部が常に一致した位置関係となるゆるみ止めナットが形成されることになる。これにより多数製造されるそれぞれのゆるみ止めナットにおいて、３個の圧縮変形部によるボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Moreover, according to the structure of the locking nut of Claim 3 of this invention, while the same effect as the effect of Claim 1 mentioned above is acquired, three compression deformation parts in a cylindrical boss | hub are formed. These compression deformation portions are formed at intervals of 120 degrees in the circumferential direction of the boss, and the tip of the cylindrical boss has a triangular shape in plan view, while the three compression deformation portions are formed by pressing. When molding, one of the three compression deformed portions is always positioned and formed so as to coincide with the rounded up position of the screw hole in the cylindrical boss. A locking nut having a positional relationship in which one compression deformation portion always coincides with the cut-up position is formed. As a result, in each of the lock nuts manufactured in large numbers, it is possible to constantly operate stably with high accuracy by suppressing variation in pre-baling torque with respect to the screw thread of the bolt due to the three compression deformed portions, which is always highly reliable. A locking nut is obtained.

また、本願の請求項４記載のゆるみ止めナットによれば、圧縮変形部は、円筒状ボスの先端をプレスによってねじ孔の２ピッチ分外周から内方に変形されると同時にそのねじ孔径及びねじ孔ピッチを変形されることにより形成されているので、ナット本体のボルトへの螺合時、円筒状ボスの圧縮変形部によりボルトのねじ山に求める圧力を容易にかつ正確にかけることが可能となり、求めるプリベリングトルクを容易に設定できてゆるみ止めの機能を十分に発揮することができる。 According to the loosening prevention nut of claim 4 of the present application, the compression deformation portion is deformed inwardly from the outer periphery by two pitches of the screw hole by pressing the tip of the cylindrical boss, and at the same time the screw hole diameter and screw Since the hole pitch is deformed, when the nut body is screwed to the bolt, the compression deformation part of the cylindrical boss can easily and accurately apply the pressure required for the screw thread of the bolt. The required pre-leveling torque can be easily set, and the function of locking can be sufficiently exhibited.

また、本発明の請求項５記載のゆるみ止めナットの構成によれば、中心部にねじ孔を有する多角形のナット本体における上面のねじ孔周りに、プレスによりねじ孔上端を下方側に変形させてピッチエラーを起こさせる圧縮変形部が形成されていることにより、ナット本体のボルトへの螺合時、圧縮変形部によりボルトのねじ山に圧力をかけることによってプリベリングトルクを増大させゆるみ止めの機能を発揮でき、しかも、ねじ孔の周方向に等角度づつ間隔をおいて形成される複数個の圧縮変形部がプレスにより成形される時、複数個の圧縮変形部のうち、一つの圧縮変形部が常にねじ孔の切り上がり位置、又は常にねじ孔の切り上がり位置に対して一定角度離れた設定位置に位置するように位置設定されて形成されているから、そのねじ孔の切り上がり位置に対して一つの圧縮変形部が常に一致した位置関係、又は切り上がり位置に対して常に一定角度離れた位置関係となるゆるみ止めナットが形成されることになる。従って、このように位置設定された条件のもとで多数製造されるそれぞれのゆるみ止めナットにあっては、複数個の圧縮変形部によるトータルのボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 According to the structure of the locking nut according to claim 5 of the present invention, the upper end of the screw hole is deformed downward by a press around the screw hole on the upper surface of the polygonal nut body having the screw hole at the center. By forming a compression deformation part that causes a pitch error, the preloading torque is increased by applying pressure to the screw thread of the bolt by the compression deformation part when the nut body is screwed to the bolt. In addition, when a plurality of compression deformation portions formed at equal intervals in the circumferential direction of the screw hole are formed by pressing, one of the plurality of compression deformation portions is compressed and deformed. Since the part is always positioned so as to be located at a set position that is always a certain angle away from the screw hole's round-up position, or always at a fixed angle with respect to the screw hole's round-up position, Positional relationship in which one of the compressive deformation portion is always matched against the ramped position of, or always be self-locking nuts becomes constant angular distant positional relationship is formed with respect ramped position. Therefore, in each of the locking nuts manufactured in large numbers under the conditions set in this way, the variation in the pre-baling torque with respect to the total bolt thread due to the plurality of compression deformed portions is highly accurate. Therefore, it is possible to obtain a locking nut that is always highly reliable and always reliable.

さらに、本発明の請求項６記載のゆるみ止めナットの構成によれば、上記した請求項５記載の効果と同様の効果が得られると共に、ねじ孔の周方向に１２０度づつ間隔をおいて形成される３個の圧縮変形部がプレスにより成形される時、３個の圧縮変形部のうち、一つの圧縮変形部が常に円筒状ボスにおけるねじ孔の切り上がり位置に一致するように位置設定されて形成されているから、そのねじ孔の切り上がり位置に対して一つの圧縮変形部が常に一致した位置関係となるゆるみ止めナットが形成されることになる。このように位置設定された条件のもとで多数製造されるそれぞれのゆるみ止めナットにあっては、３個の圧縮変形部によるトータルのボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Furthermore, according to the structure of the locking nut according to claim 6 of the present invention, the same effect as that of the above-described claim 5 can be obtained, and it is formed at intervals of 120 degrees in the circumferential direction of the screw hole. When three compressed deformation parts are formed by pressing, one of the three compression deformation parts is always positioned so as to coincide with the rounded-up position of the screw hole in the cylindrical boss. Therefore, a locking nut is formed in which the one compression deformation portion is always in the same positional relationship with respect to the raised position of the screw hole. In each of the locking nuts manufactured in large numbers under the conditions set in this way, the variation of the pre-baling torque with respect to the total screw thread due to the three compression deformed parts is suppressed with high accuracy. Therefore, it is possible to obtain a locking nut that can always operate stably and has high reliability.

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. 図１のＡ−Ａ矢視方向のゆるみ止めナットの一部切欠側面図である。It is a partially cutaway side view of the locking nut in the direction of arrows AA in FIG. 図１のＢ−Ｂ矢視方向のゆるみ止めナットの一部切欠断面図である。It is a partially cutaway sectional view of the locking nut in the direction of arrow BB in FIG. 同ゆるみ止めナットの底面図である。It is a bottom view of the locking nut. 本発明に係る別の実施例のゆるみ止めナットの平面図である。It is a top view of the locking nut of another Example which concerns on this invention. 図５のＣ−Ｃ矢視方向のゆるみ止めナットの一部切欠側面図である。FIG. 6 is a partially cutaway side view of the locking nut in the direction of arrow CC in FIG. 5. 同ゆるみ止めナットの底面図である。It is a bottom view of the locking nut.

以下本発明の実施の形態を図に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１〜図４は、本発明に係るゆるみ止めナットの実施例を示し、このナット１は、中心部にねじ孔２を有する６角形のナット本体３と、ナット本体３の上面から上方に一体に連設されかつ中心部にナット本体３のねじ孔２に連続するねじ孔４を有する円筒状ボス５とを備えている。円筒状ボス５はその肉厚がナット本体５の肉厚よりも薄く形成されていると共に、円筒状ボス５の先端の３箇所をプレスによってねじ孔４の２ピッチ分外周から内方に、つまり円筒状ボス５の先端を横から変形させると同時にそのねじ孔径及びねじ孔ピッチを変形させてピッチエラーを起こさせる３個の圧縮変形部６…６が形成されている。 1 to 4 show an embodiment of a locking nut according to the present invention. This nut 1 is integrally formed with a hexagonal nut body 3 having a screw hole 2 at the center and an upper surface of the nut body 3 upward. And a cylindrical boss 5 having a screw hole 4 continuous to the screw hole 2 of the nut body 3 at the center. The thickness of the cylindrical boss 5 is thinner than the thickness of the nut body 5, and the tip of the cylindrical boss 5 is pressed from the outer periphery to the inside by two pitches of the screw hole 4 by pressing. Three compression deformation portions 6... 6 are formed which cause the pitch error by deforming the screw hole diameter and screw hole pitch at the same time as deforming the tip of the cylindrical boss 5 from the side.

圧縮変形部６…６は円筒状ボス５の周方向に１２０度づつ間隔をおいてそれぞれ形成されている一方、これらの圧縮変形部６…６のプレスによる成形時には、３個の圧縮変形部のうち、一つの圧縮変形部６が常にねじ孔４の切り上がり位置（立ち上がり位置）４ａに一致するように位置設定されたうえで平面視三角おにぎり形状に成形されている。これにより、ねじ孔４の切り上がり位置４ａに対して一つの圧縮変形部６が常に一致した位置関係のナット１が形成される。その結果、製造されたそれぞれのナット１において、ボルト（図示せず）に対するプリベリングトルクをよりバラツキなく常に安定よく作用させる構造となっている。 The compression deformation portions 6 ... 6 are formed at intervals of 120 degrees in the circumferential direction of the cylindrical boss 5, respectively, while the compression deformation portions 6 ... 6 are formed by pressing the three compression deformation portions. Among them, one compression deforming portion 6 is always positioned so as to coincide with the cut-up position (rise position) 4a of the screw hole 4, and then formed into a triangular rice ball shape in plan view. Thereby, the nut 1 having a positional relationship in which one compression deformation portion 6 always coincides with the rounded position 4a of the screw hole 4 is formed. As a result, each manufactured nut 1 has a structure in which a pre-baling torque with respect to a bolt (not shown) is always stably applied without variation.

次に、以上のように構成した本発明に係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 according to the present invention configured as described above will be described.

ナット本体３にこれの上面から上方に一体に連設されかつ中心部にナット本体３のねじ孔２に連続するねじ孔４を有する薄肉の円筒状ボス５を突設し、この円筒状ボス５に３個の圧縮変形部６…６をプレスにより形成するようにしたから、従来のゆるみ止めナットのように６角面ナット本体の形状やナット本体の肉厚などに何ら影響されることなく、薄肉で均一の円筒状ボス５にプレスによる圧縮変形部６…６を簡単容易にかつ正確に成形することができる。また、圧縮変形部６…６はプレスによってねじ孔４の先端から２ピッチ分を外周から内方に変形されると同時にそのねじ孔径及びねじ孔ピッチが変更されてピッチエラーを起こさせるように形成されているから、ナット本体３のボルトへの螺合時、円筒状ボス５の圧縮変形部６…６によりボルトのねじ山に圧力をかけることによってプリベリングトルクを増大させゆるみ止めの機能を十分に発揮することができる。 A thin cylindrical boss 5 is provided on the nut body 3 so as to be integrally connected upward from the upper surface of the nut body 3 and has a screw hole 4 continuous with the screw hole 2 of the nut body 3. Since the three compression deformation parts 6 ... 6 are formed by pressing, the shape of the hexagonal nut body and the thickness of the nut body are not affected at all, unlike the conventional locking nut, It is possible to easily and accurately form the compression deformed portions 6... 6 by pressing on the thin and uniform cylindrical boss 5. Further, the compression deforming portions 6 ... 6 are formed so as to cause a pitch error by changing the screw hole diameter and the screw hole pitch at the same time as the two pitches from the tip of the screw hole 4 are deformed inward from the outer periphery by pressing. Therefore, when the nut body 3 is screwed into the bolt, the pressure deformation is applied to the screw thread of the bolt by the compression deformed portions 6... Can be demonstrated.

しかも、円筒状ボス５の周方向に１２０度づつ間隔をおいて形成される３個の圧縮変形部６…６は、そのプレスにより成形される時、３個の圧縮変形部のうち、一つの圧縮変形部６が常に円筒状ボス５におけるねじ孔４の切り上がり位置４ａに一致するように位置設定されて平面視三角おにぎり形状に成形されているから、ねじ孔４の切り上がり位置４ａに対して一つの圧縮変形部６が常に一致した位置関係となるゆるみ止めナット１が形成されることになる。これにより多数製造されるそれぞれのゆるみ止めナット１において、３個の圧縮変形部６…６のトータルによるボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Moreover, the three compression deformation portions 6... 6 formed at intervals of 120 degrees in the circumferential direction of the cylindrical boss 5 are one of the three compression deformation portions when formed by the press. The compression deformed portion 6 is always positioned so as to coincide with the raised position 4a of the screw hole 4 in the cylindrical boss 5 and is formed into a triangular rice ball shape in plan view. Thus, the loosening prevention nut 1 is formed in which the one compression deformation portion 6 is always in the same positional relationship. As a result, each of the locking nuts 1 manufactured in large numbers can always act stably with high accuracy by suppressing the variation in pre-torque torque with respect to the screw thread of the bolt due to the total of the three compression deformation portions 6. Therefore, a highly reliable locking nut can always be obtained.

上記した実施例では、円筒状ボス５に、３個の圧縮変形部６…６を等角度おいて形成したものについて説明したが、この他例えば一つの圧縮変形部６を円筒状ボス５の先端側全周にわたるように形成してもよい。このように形成した場合にも、薄肉で均一の円筒状ボス５にプレスによる圧縮変形部６を簡単容易にかつ正確に成形することができるし、また、圧縮変形部６はプレスによってねじ孔４の先端から２ピッチ分を外周から内方に変形されると同時にそのねじ孔径及びねじ孔ピッチが変更されてピッチエラーを起こさせるように形成されているので、ナット本体３のボルトへの螺合時、円筒状ボス５の圧縮変形部６によりボルトのねじ山に圧力をかけることによってプリベリングトルクを増大させゆるみ止めの機能を十分に発揮することができる。 In the above-described embodiment, the cylindrical boss 5 is described in which the three compression deformable portions 6... 6 are formed at an equal angle, but for example, one compressive deformable portion 6 is provided at the tip of the cylindrical boss 5. It may be formed so as to extend over the entire side. Even when formed in this way, the compression deformed portion 6 by pressing can be easily and accurately formed on the thin and uniform cylindrical boss 5, and the compressive deformed portion 6 can be formed into the screw hole 4 by pressing. Since the screw hole diameter and screw hole pitch are changed at the same time as two pitches from the tip of the screw are deformed inward, the pitch error is caused, so that the nut body 3 is screwed onto the bolt. At this time, by applying pressure to the screw thread of the bolt by the compression deformation portion 6 of the cylindrical boss 5, the leveling torque can be increased and the function of preventing loosening can be sufficiently exhibited.

また、上記した圧縮変形部６は、１個や３個に限らず２個や４個など複数個設けるようにしてもよい。なお、複数個設ける場合、圧縮変形部６…６を円筒状ボス５の周方向に等角度をおいてそれぞれ形成する一方、これらの圧縮変形部６…６をプレスにより成形する時、複数個の圧縮変形部６…６のうち、一つの圧縮変形部６が常にねじ孔２の切り上がり位置４ａに一致するように位置設定するか、もしくは一つの圧縮変形部６が常にねじ孔２の切り上がり位置４ａに対して常に一定角度離れた定位置となるように位置設定して形成する。このように構成することにより、先の実施例の場合と同様に多数製造されるそれぞれのゆるみ止めナット１において、複数個の圧縮変形部６…６のボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Further, the compression deformation section 6 described above is not limited to one or three, and a plurality of compression deformation sections 6 such as two or four may be provided. In the case where a plurality of compression deformation portions 6... 6 are formed at equal angles in the circumferential direction of the cylindrical boss 5, a plurality of compression deformation portions 6. Among the compression deformation portions 6... 6, one compression deformation portion 6 is always positioned so as to coincide with the rounded position 4 a of the screw hole 2, or one compression deformation portion 6 is always rounded up of the screw hole 2. The position is set so that the position is always a fixed angle away from the position 4a. With this configuration, in each of the locking nuts 1 manufactured in the same manner as in the case of the previous embodiment, variation in pre-baling torque with respect to the screw threads of the plurality of compression deformable portions 6... A highly reliable locking nut can always be obtained with high accuracy and stable operation.

さらに、ナット本体３は６角形に限られるものではなく、４角形や８角形、１２角形などの多角形ナット本体であってもよいし、また、多角形ナット本体の下面側に大径のフランジ（鍔部）を一体に連設したものであってもよい。なお、上記した実施例では圧縮変形部６…６として、プレスによりねじ孔４の先端から２ピッチ分を外周から内方に変形させることにより形成したけれども、必ずしも２ピッチ分でなくてもよい。 Further, the nut body 3 is not limited to a hexagonal shape, and may be a polygonal nut body such as a quadrangular, octagonal, or dodecagonal shape, and a large-diameter flange on the lower surface side of the polygonal nut body. (Saddle) may be integrally provided. In the above-described embodiment, the compression deforming portions 6... 6 are formed by deforming two pitches from the tip of the screw hole 4 inward from the outer periphery by pressing.

図５〜図７は、本発明に係るゆるみ止めナットの別の実施例を示し、このナット１１は、中心部にねじ孔１２を有する６角形のナット本体１３における上面のねじ孔１２周りに、プレスによりねじ孔上端を上から下方に変形させてそのねじ孔ピッチを変形させてなる圧縮変形部１６…１６が３個形成されており、かつ、これらの圧縮変形部１６…１６がねじ孔１２の周方向に１２０度づつ間隔をおいてそれぞれ形成されている一方、これら３個の圧縮変形部１６…１６のプレスによる成形時、これら３個の圧縮変形部１６…１６のうち、一つの圧縮変形部１６が常にねじ孔１２の切り上がり位置１２ａに位置するように位置設定されて形成されている。 5 to 7 show another embodiment of the locking nut according to the present invention. The nut 11 is formed around the screw hole 12 on the upper surface of a hexagonal nut body 13 having a screw hole 12 at the center. Three compression deformation portions 16... 16 are formed by deforming the upper end of the screw hole from above by pressing to change the pitch of the screw holes, and these compression deformation portions 16... 16 are formed in the screw holes 12. Are formed at intervals of 120 degrees in the circumferential direction, while one of the three compression deformable portions 16... 16 is compressed when the three compression deformable portions 16. The deformed portion 16 is formed so that the position is always set so that the deformed portion 16 is located at the cut-up position 12 a of the screw hole 12.

従って、この別の実施例のゆるみ止めナット１１においても、前述の実施例のゆるみ止めナット１と同様にねじ孔１２の切り上がり位置１２ａに対して一つの圧縮変形部６が常に一致した位置関係となるゆるみ止めナット１が形成されることになる。その結果、このように位置設定された条件のもとで多数製造されるそれぞれのゆるみ止めナット１１にあっては、３個の圧縮変形部１６…１６のトータルによるボルト（図示せず）のねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 Therefore, also in the locking nut 11 of this other embodiment, as in the locking nut 1 of the above-described embodiment, the positional relationship in which one compression deformation portion 6 always coincides with the rounded position 12a of the screw hole 12 is. Thus, a locking nut 1 is formed. As a result, in each of the locking nuts 11 manufactured in a large number under the conditions set in this way, a screw (not shown) of a screw by a total of three compression deformable portions 16. It is possible to keep the variation in the pre-leveling torque with respect to the mountain with high accuracy, and to always act stably, and to obtain a highly reliable locking nut.

この別の実施例では、ナット本体１３における上面のねじ孔１２周りに、３個の圧縮変形部１６…１６を等角度おいて形成したものについて説明したが、圧縮変形部１６は、３個に限らず例えば２個や４個など複数個設けるようにしてもよい。また、複数個設ける場合、圧縮変形部１６…１６をねじ孔１２の周方向に等角度をおいてそれぞれ形成する一方、これらの圧縮変形部１６…１６をプレスにより成形する時、複数個の圧縮変形部１６…１６のうち、一つの圧縮変形部１６が常にねじ孔１２の切り上がり位置１２ａに一致するように位置設定するか、もしくは一つの圧縮変形部１６が常にねじ孔１２の切り上がり位置１２ａに対して常に一定角度離れた定位置となるように位置設定して形成する。このように位置設定された構成とすることにより、先の実施例の場合と同様に多数製造されるそれぞれのゆるみ止めナット１１において、複数個の圧縮変形部１６…１６のトータルによるボルトのねじ山に対するプリベリングトルクのバラツキを高精度に抑えて常に安定よく作用させることができ、常に信頼度の高いゆるみ止めナットが得られる。 In this other embodiment, the description has been given of the case where the three compression deformation portions 16... 16 are formed at equal angles around the screw hole 12 on the upper surface of the nut body 13. For example, two or four or more may be provided. When a plurality of compression deformation portions 16... 16 are formed at equal angles in the circumferential direction of the screw hole 12, a plurality of compression deformation portions 16. Of the deformation portions 16... 16, one compression deformation portion 16 is always set so as to coincide with the rounded position 12 a of the screw hole 12, or one compression deformation portion 16 is always rounded up to the screw hole 12. The position is set so as to be always at a fixed position with respect to 12a. By adopting the position set in this way, in each of the locking nuts 11 that are manufactured in the same manner as in the previous embodiment, the screw thread of the bolt by the total of the plurality of compression deformable portions 16. Therefore, a highly reliable locking nut can be obtained at all times.

また、ナット本体３は６角形に限られるものではなく、４角形や８角形、１２角形などの多角形ナット本体であってもよいし、また、多角形ナット本体の下面側に例えば大径のフランジ（鍔部）を一体に連設したフランジ付きのものや、これらのナット本体の下面側に複数の溶接用の突起を一体に設けた溶接突起付きのものであってもよい。なお、溶接突起付きのナット本体の突起としては、例えばナット本体の下面から３つ又は４つの突起が下方又は斜め放射状方向に突出しかつそれぞれが断面視三角形状又は四角形状を呈するものであったり、或いはナット本体の下面から断面視円形を呈する複数個の突起が下方に一体に突出するようなものであってもよい。 The nut body 3 is not limited to a hexagonal shape, and may be a polygonal nut body such as a quadrangular shape, an octagonal shape, or a dodecagonal shape. It may be one with a flange in which flanges (ridges) are integrally connected, or one with a welding projection in which a plurality of welding projections are integrally provided on the lower surface side of these nut bodies. In addition, as the protrusion of the nut main body with the welding protrusion, for example, three or four protrusions protrude downward or obliquely in the radial direction from the lower surface of the nut main body, and each has a triangular shape or a quadrangular shape in sectional view, Alternatively, a plurality of protrusions having a circular cross-sectional view from the lower surface of the nut main body may protrude integrally downward.

また、図５において１７はナット本体１３の上面に設けたゆるみ止めナット１１の種類やメーカーを示すための刻印記号である。この記号により例えば一つの圧縮変形部１６が常にねじ孔１２の切り上がり位置１２ａに一致するように位置設定されたゆるみ止めナット１１であるか、或いは一つの圧縮変形部１６が常にねじ孔１２の切り上がり位置１２ａに対して常に一定角度離れた定位置となるように位置設定されたゆるみ止めナットであるかなどの識別や、他のナットとの区別を行い混同や誤認使用などを防止するために設けたものである。 In FIG. 5, reference numeral 17 denotes an inscription symbol for indicating the type and manufacturer of the locking nut 11 provided on the upper surface of the nut body 13. By this symbol, for example, one compression deformation portion 16 is the locking nut 11 positioned so as to always coincide with the rounded position 12 a of the screw hole 12, or one compression deformation portion 16 is always in the screw hole 12. In order to prevent confusion and misuse by identifying whether the nut is a locking nut that is always set at a fixed angle away from the round-up position 12a, and distinguishing it from other nuts. Is provided.

１ゆるみ止めナット
２ねじ孔
３ナット本体
４ねじ孔
４ａ切り上がり位置
５円筒状ボス
６圧縮変形部
１１ゆるみ止めナット
１２ねじ孔
１２ａ切り上がり位置
１３ナット本体
１６圧縮変形部DESCRIPTION OF SYMBOLS 1 Loosening prevention nut 2 Screw hole 3 Nut main body 4 Screw hole 4a Cut-up position 5 Cylindrical boss 6 Compression deformation part 11 Loosening prevention nut 12 Screw hole 12a Cut-up position 13 Nut main body 16 Compression deformation part

Claims

A cylindrical nut body having a screw hole at the center and a cylindrical boss having a screw hole continuous from the upper surface of the nut body and continuously connected to the screw hole of the nut body at the center. The boss has a thickness that is thinner than the thickness of the nut body, and at the same time the cylindrical boss is deformed from the outer periphery of the screw hole to the inside by pressing the entire circumference or multiple locations. A compression deformation portion is formed by deforming the screw hole diameter and the screw hole pitch. When the nut body is screwed to the bolt, the pressure is applied to the screw thread of the bolt by the compression deformation portion of the cylindrical boss. A locking nut characterized by increased ring torque and a locking function.

A plurality of compression deformation portions in the cylindrical boss are formed, and these compression deformation portions are respectively formed at equal angular intervals in the circumferential direction of the boss. At the time of molding by pressing, one of the plurality of compression deformed portions is always located at a set position at a certain angle away from the screw hole's up-cut position or always at a fixed angle with respect to the screw hole's up-cut position. 2. The locking nut according to claim 1, wherein the locking nut is formed to be positioned.

Three compression deformation portions in the cylindrical boss are formed, and these compression deformation portions are formed at intervals of 120 degrees in the circumferential direction of the boss, and the tip of the cylindrical boss has a triangular shape in plan view. On the other hand, when these three compression deformation parts are formed by pressing, one of the three compression deformation parts is set so that one compression deformation part is always located at the up-cut position of the screw hole. The locking nut according to claim 1, wherein the locking nut is provided.

The compression deformation portion is formed by deforming the tip end of the cylindrical boss from the outer periphery to the inside by two pitches by a press and simultaneously changing the screw hole diameter and the screw hole pitch. The locking nut according to claim 1 or claim 2 or claim 3.

A plurality of compression deformation portions are formed around the upper screw hole of the polygonal nut body having a screw hole in the center by deforming the upper end of the screw hole downward by pressing and changing the pitch of the screw hole. These compression deformation portions are formed at equal angular intervals in the circumferential direction of the screw hole, respectively, while one of the compression deformation portions is compressed during molding by pressing of the compression deformation portions. A loosening prevention nut characterized in that the deformed portion is always positioned so as to be positioned at a set position at a certain angle away from a position at which the screw hole is rounded up or always at a certain angle.

Three compression deformation portions are formed, and these compression deformation portions are formed at intervals of 120 degrees in the circumferential direction of the screw hole, respectively, while these three compression deformation portions are formed by pressing. 7. The locking device according to claim 6, wherein one of the three compression deformation portions is positioned and formed so that the compression deformation portion is always located at a position where the screw hole is cut up. nut.