JP5455404B2

JP5455404B2 - Multi-thread screw to prevent loosening

Info

Publication number: JP5455404B2
Application number: JP2009067520A
Authority: JP
Inventors: 安雄鈴木
Original assignee: 株式会社スズキ螺子製作所
Priority date: 2009-03-19
Filing date: 2009-03-19
Publication date: 2014-03-26
Anticipated expiration: 2029-03-19
Also published as: JP2010216638A

Description

本発明は緩み防止用の多条ねじに関し、例えば自動車、家電製品、電子機器部品、複写機等の事務用機器、さらにはデジタルカメラのような光学機器、携帯電話器等、精密機器の部品の取付に最適に使用されるものである。 Relates multiple thread for the invention anti-loosening, for example automobiles, home appliances, electronic components, office equipment such as copiers, more optical devices such as digital cameras, portable telephone, precision equipment parts It is optimally used for mounting.

従来、締結後の緩みを防止できるロックねじとして、軸の外周に第１のリード角でもって形成された第１のねじ山と、上記軸の外周に上記第１のねじ山と同じ旋回方向に上記第１のリード角と異なる第２のリード角でもって上記第１のねじ山よりも低い高さに形成され、上記第１のねじ山に交差する第２のねじ山を備えたロックねじがあった。そして、このロックねじは、被締結部材に回転されながらねじ込まれると、第１のリード角とは異なる第２のリード角をもち、第１のねじ山よりも低い第２のねじ山が旋回方向に回転されて行き、高い第１のねじ山が第１のリード角で深い螺旋溝を切り、低い第２のねじ山が第２のリード角で浅い螺旋溝をきりつつ被締結材に侵入することにより、ねじ軸全体がねじ込まれ、締結が完了する。また、被締結部材の振動で、締結後のロックねじが緩み方向に回転しようとすると、第１のねじ山、および第２のねじ山が、夫々のリード角で切った螺旋溝に密着するので、緩み方向の回転に対する抵抗力が大きく、緩みを防止する。また、鋭角をなす第１のねじ山、および第２のねじ山の先細の交差部に、被締結部材の一部が押し込まれ、ロックねじの緩み方向の回転が阻止されるというものがあった（特許文献参照。）。 Conventionally, as a lock screw capable of preventing loosening after fastening, a first screw thread formed at the outer periphery of the shaft with a first lead angle and an outer periphery of the shaft in the same turning direction as the first screw thread. A locking screw having a second lead angle different from the first lead angle and having a second screw thread formed at a height lower than the first screw thread and intersecting the first screw thread. there were. When the lock screw is screwed in while being rotated by the member to be fastened, the second screw thread has a second lead angle different from the first lead angle, and the second screw thread lower than the first screw thread is in the turning direction. The high first screw thread cuts a deep spiral groove at the first lead angle, and the low second screw thread penetrates the material to be fastened while cutting the shallow spiral groove at the second lead angle. As a result, the entire screw shaft is screwed in and the fastening is completed. Further, when the lock screw after fastening is rotated in the loosening direction due to the vibration of the fastened member, the first screw thread and the second screw thread come into close contact with the spiral groove cut at the respective lead angles. , Resistance to rotation in the loosening direction is large, preventing loosening. In addition, a part of the member to be fastened is pushed into the tapered intersection of the first thread and the second thread that form an acute angle, and rotation of the lock screw in the loosening direction is prevented. (See patent literature).

特開平８−８６３０６号公報JP-A-8-86306

特許文献に記載の上記従来のロックねじは、第１のリード角を有する第１のねじ山に対して第２のリード角を有する第２のねじ山が交差し、しかも、第１のねじ山、および第２のねじ山の山角が大きいので、ロックねじを被締結材に螺入する場合のドライブトルクが大きくなり、操作性が悪いという欠点があった。 In the conventional lock screw described in the patent document, the second thread having the second lead angle intersects the first thread having the first lead angle, and the first thread Since the angle of the second thread is large, the drive torque when the lock screw is screwed into the material to be fastened is increased, and the operability is poor.

また、特許文献に記載の上記従来のロックねじは、第１のリード角を有する第１のねじ山に対して第２のリード角を有する第２のねじ山が交差しているので、ロックねじを被締結材に螺入して行く場合に、第１のねじ山、および第２のねじ山の先細の交差部に被締結部材の切削された一部が押し込まれることにより、嵩高になる。従って、この嵩高になった被締結部材の切削部材の一部により、ロックねじの回転操作時に、タッピングされるべき被締結部材の溝部が、第１のねじ山、および第２のねじ山の先細の交差部に押し込まれた嵩高の前記被締結部材の一部による接触による摩擦力が非常に大きくなるので、破壊され易くなり、溝部が綺麗な仕上がりにはならずに分断されたり、破壊や変形を生ずるため、ロックねじを螺退し、再使用する場合に、螺入時のドライブトルクがかかると溝部が欠けたり、また、雌ねじ孔と第１のねじ山、および第２のねじ山との間の隙間が大きくなる結果、ロックねじは緩み易くなり、再使用に適するものではなかった。 Further, in the above conventional lock screw described in the patent document, the second screw thread having the second lead angle intersects the first screw thread having the first lead angle. Is screwed into the material to be fastened, and the cut part of the fastened member is pushed into the tapered intersection of the first screw thread and the second screw thread, resulting in a bulky state. Therefore, the groove portion of the fastened member to be tapped at the time of the rotation operation of the lock screw causes the groove portion of the fastened member to be tapped to be tapered by the first screw thread and the second screw thread. The frictional force caused by contact with a part of the bulky fastened member pushed into the intersection of the parts becomes very large, so it is easy to break, and the groove is not finished cleanly, and is broken, broken or deformed Therefore, when the lock screw is screwed out and reused, if the drive torque at the time of screwing is applied, the groove portion may be chipped or the female screw hole and the first and second screw threads may be As a result of the increase in the gap between them, the lock screw is easy to loosen and is not suitable for reuse.

しかも、特許文献に記載の上記従来のロックねじは、被締結部材が木材や鋼板を対象として使用されるものであるが、昨今では、特に家電製品、電子機器部品、複写機等の事務用機器、デジタルカメラ等の光学機器や精密機器の取付けに供されるねじは、アルミニウムのような軽量であり、かつ、軟らかい金属であるとか、合成樹脂であるとか、の数種の材料にも、使用されるという、要請がある。このように、金属、或いは合成樹脂であるとか、また、軟らかい、或いは硬い、また、熱的変形に弱い、或いは強い、また、締結部材が薄くて、塑性変形し易い等の種々の異なる特性に答えて使用されるねじのニーズが高まりをみせているが、これらの要請に答えて使用されるねじには、ドライブトルクが低く簡単な取扱い操作により螺入が行え、螺入後には、緩まずに、大きな戻しトルクにより、振動に耐え得る確実な保持力が得られることが望まれている。 Moreover, the conventional lock screw described in the patent document is used for a member to be fastened for wood or a steel plate. Recently, however, office equipment such as home appliances, electronic device parts, copiers, etc. Screws used for mounting optical equipment and precision equipment such as digital cameras are lightweight like aluminum, and are also used for several types of materials such as soft metals and synthetic resins. There is a request to be done. In this way, it is a metal or a synthetic resin, or it is soft or hard, and it is weak or strong against thermal deformation, and the fastening member is thin and easy to plastically deform. Although the need for screws to be used in response is increasing, the screws used in response to these requests can be screwed in by a simple handling operation with a low drive torque. In addition, it is desired that a reliable holding force capable of withstanding vibration is obtained by a large return torque.

本発明は上記従来の問題点を精査し、アルミニウムのように軽量であり、かつ、軟らかい金属や合成樹脂等の材料に使用するのに最適であり、被締結部材に対する螺入時のドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行え、また、螺入後の緩み防止に優れ、大きな戻しトルクにより、振動に耐え得る確実な保持力が得られ、さらには、構造的な強度が大きく、製作するのに量産可能であり、製作コストが安価な緩み防止用の多条ねじ、およびその多条ねじの取付部材を提供することを目的とする。 The present invention examines the above-mentioned conventional problems, is light like aluminum, and is optimal for use in materials such as soft metals and synthetic resins, and has a drive torque when screwed into a fastened member. Low and easy handling, good operability and good screwing, excellent prevention of loosening after screwing, large return torque provides reliable holding force that can withstand vibration, and structural strength An object of the present invention is to provide a multi-thread screw for preventing looseness and a mounting member for the multi-thread screw, which are large, can be mass-produced for manufacturing, and are inexpensive to manufacture.

本発明の請求項１に記載の発明は、
１条のねじ山よりなる螺旋状の第１ねじ山部と１条または複数のねじ山よりなる螺旋状の第２ねじ山部とで構成されて精密機器の部品の取付に使用される多条ねじであって、
前記第１ねじ山部相互間に、前記第２ねじ山部が設けられ、かつ、前記第１ねじ山部の高さが、前記第２ねじ山部の高さよりも高くされた多条ねじにおいて、
前記第１ねじ山部の第１山角が、前記第２ねじ山の第２山角よりも小さくされ、
前記第１ねじ山部が、前記第１山角を形成する第１斜面と、該第１斜面に連続されるとともに曲率を有して構成された第２斜面と、で構成され、
前記第２ねじ山部が、前記第２斜面に連続されるとともに前記第２山角を形成する第３斜面から構成され、
前記第２斜面のリード角が、前記第３斜面のリード角と略同一にされ、
前記第１ねじ山部が、その山頂部から、前記第２斜面と前記第３斜面との境界である歯元部に向かって全体的として断面円弧状をなす滑らかな曲面側部を有していることを特徴とする。 The invention described in claim 1 of the present invention
A multi-thread that is composed of a spiral first thread portion made of one thread and a second thread portion made of one or a plurality of threads, and is used for mounting precision equipment parts. A screw,
In the multi-thread screw in which the second thread portion is provided between the first thread portions, and the height of the first thread portion is higher than the height of the second thread portion. ,
The first mountain angle of the first threaded portion is smaller than the second crest angle of the second thread,
The first thread portion is composed of a first slope that forms the first slope, and a second slope that is continuous with the first slope and is configured to have a curvature,
The second thread portion is constituted by a third slope that is continuous with the second slope and forms the second angle;
The lead angle of the second slope is substantially the same as the lead angle of the third slope ;
The first screw thread portion has a smooth curved side portion that forms a circular arc section as a whole toward a tooth root portion that is a boundary between the second slope surface and the third slope surface from the peak portion. It is characterized by being.

また、本発明の請求項２に記載の発明は、請求項１において、前記第１ねじ山部の山角が、１５度〜３０度にされていることを特徴とする。 The invention according to claim 2 of the present invention is characterized in that, in claim 1, a crest angle of the first screw thread portion is set to 15 degrees to 30 degrees .

また、本発明の請求項３に記載の発明は、請求項１または２において、前記第２ねじ山部のねじ山高さが、前記第１ねじ山部のねじ山高さの略１／２以下にされていることを特徴とする。 According to a third aspect of the present invention, in the first or second aspect, the screw thread height of the second screw thread part is approximately ½ or less of the screw thread height of the first screw thread part. It is characterized by being.

また、本発明の請求項４に記載の発明は、請求項１〜３の何れか１項において、前記第２ねじ山部の山角が、６０度〜１００度にされていることを特徴とする。 In addition, the invention according to claim 4 of the present invention is characterized in that, in any one of claims 1 to 3, the angle of the second screw thread is 60 degrees to 100 degrees. To do.

本発明の請求項１に記載の発明によれば、１条のねじ山よりなる多数の第１ねじ山部と１条または複数のねじ山部よりなる多数の第２ねじ山部とで構成された多条ねじであって、前記第１ねじ山部相互間に、前記第２ねじ山部が設けられ、かつ、前記第１ねじ山部の高さが、前記第２ねじ山部の高さよりも高くされた多条ねじにおいて、前記第１ねじ山部の山角が、前記第２ねじ山の山角よりも小さくされ、前記第１ねじ山部のリード角が、前記第２ねじ山部のリード角に略同一にされ、前記第１ねじ山部が、その山頂部から歯元部に向かって全体的として断面円弧状をなす滑らかな曲面側部を有しているので、被取付部材に対する螺入時に、ねじ山高さが高い第１ねじ山部の山角は、第２ねじ山部の山角よりも小さく、先鋭なため、被取付部材の取付孔の内周に円滑且つ迅速に螺旋溝を描いて食い込むから、螺入時のドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行える。そして、第１ねじ山部が、山頂部から歯元部に向かって全体的として断面円弧状をなす滑らかな曲面側部を有しているので、この全体的として断面円弧状をなす滑らかな曲面側部に、タッピングされた被取付部材の取付孔の内周が大きな接触面積により接触することにより、摩擦係合力が大きくなり、さらに、前記曲面側部が、被取付部材の取付孔の内周に接触面積を増やし、さらに、締め付けながら静水圧をかけて強度をもたせることができるから、大きな保持力を発揮する。そして、第２ねじ山部が、第１ねじ山部よりもねじ山高さが低く、前記第１ねじ山部間に、第１ねじ山部に対して略同一のリード角により形成されているので、被締結部材に設けられた取付孔内に簡単かつ円滑に螺入操作が行えるとともに、螺退操作が行える。しかも、第１ねじ山部間に、第１ねじ山部よりもねじ山高さが低く形成された第２ねじ山部が、被締結部材に設けられた取付孔内に食い込むのと、前述のように第１ねじ山部に山頂部から歯元部に向かって全体的として断面円弧状をなす滑らかな曲面側部が、多条ねじの螺入時に被取付部材の取付孔の内周に大きな接触面積により接触されて螺入されるのと、曲面側部が、被取付部材の取付孔の内周に静水圧がかかって、強度がアップされて食い込むのとから、大きな戻しトルクが発揮され、外部的な振動に耐え得る確実な保持力が得られるため、優れた緩み防止機能を発揮する。そして、請求項１に記載の緩み防止用の多条ねじによれば、前述のように、第１ねじ山部が、山頂部から歯元部に向かって全体的として断面円弧状をなす滑らかな曲面側部が、前記第１ねじ山部よりもねじ山高さが低く、前記第１ねじ山部間に形成された第２ねじ山部に向かって設けられているので、被取付部材に設けられた取付孔の内周に第１ねじ山部が螺入されて食い込まれ、雌ねじ孔が形成されて行く時に生ずる切削屑は、第１ねじ山部に、山頂部から歯元部に向かって全体的として断面円弧状をなす滑らかな前記曲面側部に沿って円滑に誘導されるため、緩み防止用の多条ねじの回転操作時に、タッピングされる被取付部材の雌ねじ孔が破壊されずに綺麗な仕上がりに済むので、緩み防止ねじを螺退し、複数回再使用することができる。そして、特許文献に記載の従来のロックねじのように、雌ねじ孔と第１のねじ山、および第２のねじ山との間の隙間が大きくなり、緩み易くなるという不都合は解消される。従って、本実施形態１の緩み防止ねじは、例えば、アルミニウムのように軽量であり、かつ軟らかい金属、また、被取付部材が薄くて、塑性変形し易く、また、摩擦により発生される熱による熱的変形に弱い合成樹脂等の種々の異なる材料に使用するのに適する。さらには、本実施形態１の緩み防止用ねじは、第１ねじ山部が、山頂部から歯元に向かって全体的として断面円弧状をなす滑らかな曲面側部を対向して設けているので、被取付部材に対する螺入時、または螺退時において、曲面側部が引っ張り、ねじれ、圧縮に耐え、構造的に大きな強度を発揮する。さらには、断面略円弧状をなす曲面側部を対向して設けている第１ねじ山部、および第２ねじ山部は、例えば転造ダイスを用いることにより軸体部の外周に形成するのが容易であるので、量産可能であり、製作および加工が容易に行える。 According to invention of Claim 1 of this invention, it is comprised with many 1st thread parts which consist of 1 thread, and many 2nd thread parts which consist of 1 thread or several thread parts. A multi-threaded screw, wherein the second thread portion is provided between the first thread portions, and the height of the first thread portion is higher than the height of the second thread portion. In the multi-threaded screw having a high height, the angle of the first thread is smaller than the angle of the second thread, and the lead angle of the first thread is the second thread. The first screw thread portion has a smooth curved side portion that has a circular arc shape as a whole from the summit portion toward the tooth root portion. At the time of screwing in, the angle of the first thread with a high thread height is smaller and sharper than the angle of the second thread, so Since biting painted smoothly and rapidly spiral groove on the inner periphery of the mounting hole of the timber, the drive torque of the screw Nyutoki can be performed operability is good screwed at low simple handling. And since the 1st thread part has the smooth curved-surface side which makes a cross-sectional arc shape as a whole toward the tooth root part from the crest part, the smooth curved surface which makes this cross-section arc shape as a whole When the inner periphery of the mounting hole of the tapped mounting member contacts the side portion with a large contact area, the frictional engagement force increases, and the curved side portion is the inner periphery of the mounting hole of the mounting member. Since the contact area can be increased and the strength can be increased by applying the hydrostatic pressure while tightening, it exerts a large holding power. And since the 2nd thread part is lower than the 1st thread part, and the thread height is formed between the said 1st thread parts with the lead angle substantially the same with respect to the 1st thread part. The screwing operation can be performed easily and smoothly in the mounting hole provided in the fastened member, and the screwing operation can be performed. In addition, as described above, when the second screw thread portion formed between the first screw thread portions and having a lower thread height than the first screw thread portion bites into the mounting hole provided in the fastened member. In addition, the smooth curved side portion having an overall cross-sectional arc shape from the peak portion to the tooth root portion on the first screw thread portion makes great contact with the inner periphery of the mounting hole of the mounted member when the multi-thread screw is screwed in. A large return torque is exerted because the curved side portion is brought into contact with the area and screwed in, and the hydrostatic pressure is applied to the inner periphery of the mounting hole of the mounted member, the strength is increased, and the bite is increased. A reliable holding force that can withstand external vibrations is obtained, so it exhibits an excellent anti-loosening function. According to the multi-thread screw for preventing looseness according to claim 1, as described above, the first screw thread portion is a smooth cross-sectional arc as a whole from the summit portion toward the tooth root portion. Since the curved side portion has a thread height lower than that of the first thread portion and is provided toward the second thread portion formed between the first thread portions, it is provided on the mounted member. When the first screw thread portion is screwed into the inner periphery of the mounting hole and the female screw hole is formed, the cutting waste generated when the female screw hole is formed is entirely directed from the peak portion to the tooth root portion. As the target is smoothly guided along the curved side portion having a circular arc cross section, the female screw hole of the mounted member to be tapped is not broken when rotating the multi-thread screw for preventing looseness. As a result, the loosening prevention screw can be screwed out and reused multiple times. . Then, like the conventional lock screw described in the patent document, the gap between the female screw hole and the first screw thread and the second screw thread becomes large, and the inconvenience that it is easy to loosen is eliminated. Thus, anti-loosening screw of the present embodiment 1 is, for example, a light weight as A aluminum and soft metal also, thin is the mounting member, plastically deformed easily, also due to heat generated by friction Suitable for use in a variety of different materials such as synthetic resins that are vulnerable to thermal deformation. Furthermore, in the screw for preventing loosening of the first embodiment, the first screw thread portion is provided with the smooth curved side portion having an arcuate cross section as a whole from the peak portion toward the tooth base. When the screw is inserted into or retracted from the member to be attached, the curved side portion withstands pulling, twisting and compression, and exhibits a large structural strength. Furthermore, the 1st thread part and the 2nd thread part which have provided the curved-surface side part which makes a cross-section substantially circular arc shape facing are formed in the outer periphery of a shaft part, for example by using a rolling die. Therefore, it can be mass-produced and can be easily manufactured and processed.

また、本発明の請求項２に記載の発明によれば、請求項１項において、前記第１ねじ山部の山角が、１５度〜３０度にされているので、被取付部材に設けられた取付孔の内周に山角が、１５度〜３０度に形成されている先鋭な歯先の第１ねじ山部が抵抗が少なく、螺入されて食い込まれ、螺入時のドライブトルクが低く、簡単な取扱いにて操作性が良く螺入が行え、引張り、または圧縮に対しても強度を発揮する。また、第１ねじ山部の山頂部から歯元部に向かって設けられた全体的として断面円弧状をなす滑らかな曲面側部が、接触面積が増えることにより、静水圧をかけ、強度をもたせて食い込んでいる被取付部材の取付孔の内周に、螺入後においては第１ねじ山部、および第１ねじ山部よりもねじ山高さが低い第２ねじ山部が、螺入されていることにより、摩擦係合力が増し、大きな戻しトルクを発揮し、緩みは防止される。 According to the invention described in claim 2 of the present invention, in claim 1, the angle of the first screw thread portion is set to 15 degrees to 30 degrees. The first threaded part of the sharp tooth tip formed on the inner periphery of the mounting hole with a crest angle of 15 degrees to 30 degrees has little resistance and is screwed in, and the drive torque at the time of screwing is Low, easy to handle with good handling, can be screwed in, and exerts strength against tension or compression. In addition, the smooth curved side portion having an overall cross-sectional arc shape provided from the peak portion of the first screw thread portion toward the tooth root portion increases the contact area, thereby applying hydrostatic pressure and increasing strength. The first screw thread part and the second screw thread part whose thread height is lower than the first screw thread part after screwing are screwed into the inner periphery of the mounting hole of the mounted member that bites in As a result, the frictional engagement force increases, a large return torque is exhibited, and loosening is prevented.

また、本発明の請求項３に記載の発明によれば、請求項１または２において、前記第２ねじ山部のねじ山高さが、前記第１ねじ山部のねじ山高さの略１／２以下にされているので、被取付部材に対する螺入時に、ねじ山高さが高い第１ねじ山部は、被取付部材の取付孔の内周に円滑且つ迅速に螺旋溝を描いて食い込まれるから、螺入時のドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行える。そして、第１ねじ山部にその山頂部から歯元部に向かって設けられた全体的として断面円弧状をなす滑らかな曲面側部が、接触面積が増大されることにより、静水圧をかけ、強度をもたせている被取付部材の取付孔の内周に、螺入後には第１ねじ山部のねじ山高さに対して略１／２以下のねじ山高さが低い第２のねじ山部が螺入されることにより、摩擦係合力が増し、大きな戻しトルクを発揮し、緩みは防止される。 According to the invention described in claim 3 of the present invention, in claim 1 or 2, the screw thread height of the second screw thread portion is approximately ½ of the screw thread height of the first screw thread portion. Since the first screw thread portion with a high thread height is drawn into the inner periphery of the mounting hole of the mounted member smoothly and quickly when it is screwed into the mounted member, The drive torque at the time of screwing is low, and easy handling makes it easy to screw. And the smooth curved side part which makes the cross-sectional arc shape as a whole provided in the first screw thread part from the peak part toward the tooth root part increases the contact area, thereby applying hydrostatic pressure, On the inner periphery of the mounting hole of the mounted member having strength, a second thread portion having a lower thread height of approximately 1/2 or less than the thread height of the first thread portion after screwing is provided. By being screwed in, the frictional engagement force is increased, a large return torque is exhibited, and loosening is prevented.

また、本発明の請求項４に記載の発明によれば、請求項１〜３の何れか１項において、前記第２ねじ山部の山角が、６０度〜１００度にされているので、被取付部材に対する螺入時に、ねじ山高さが高い第１ねじ山部は、被取付部材の取付孔の内周に円滑且つ迅速に螺旋溝を描いて食い込む。そして、第１ねじ山部の山頂部から歯元部に向かって設けられた全体的として断面円弧状をなす滑らかな曲面側部が、接触面積が増大されて静水圧をかけ、強度をもたせて食い込んでいる被取付部材の取付孔の内周に、螺入後においては第１ねじ山部のねじ山高さに対して略１／２以下のねじ山高さの第２のねじ山部が螺入されることにより、摩擦係合力が増し、大きな戻しトルクを発揮し、緩みは防止される。 According to the invention described in claim 4 of the present invention, in any one of claims 1 to 3, the angle of the second threaded portion is set to 60 degrees to 100 degrees. At the time of screwing into the mounted member, the first threaded portion having a high thread height bites into the inner circumference of the mounting hole of the mounted member smoothly and quickly by drawing a spiral groove. And the smooth curved side part which makes a cross-sectional arc shape as a whole provided from the crest part of the first screw thread part toward the tooth root part increases the contact area, applies hydrostatic pressure, and gives strength. The second threaded part having a thread height of approximately 1/2 or less of the threaded height of the first threaded part is screwed into the inner periphery of the mounting hole of the mounted member that is biting in. As a result, the frictional engagement force increases, a large return torque is exhibited, and loosening is prevented.

また、前記第１ねじ山部相互間に、前記第２ねじ山部が１条設けられているので、被取付部材に対する螺入時に、ねじ山高さが高い第１ねじ山部は、被取付部材の取付孔の内周に円滑且つ迅速に螺旋溝を描いて食い込むから、螺入時のドライブトルクが低く、簡単な取扱いにて操作性が良く螺入が行える。そして、第２ねじ山部が、第１ねじ山部よりもねじ山高さが低く、前記第１ねじ山部間に第１ねじ山部に対して略同一のリード角により形成されているので、螺入後においては第２ねじ山部が、大きな戻しトルクを発揮し、外部的な振動に耐え得る確実な保持力が得られるため、優れた緩み防止を発揮する。また、緩み防止用の多条ねじは、第１ねじ山部相互間に前記第２ねじ山部が１条設けられているので、構造が簡単であり、製作は容易である。 The front SL between the first screw crests cross because the second threaded section is provided Article 1, the threaded Nyutoki respect to the mounting member, the threads are taller first threaded portion, the mounting Since the spiral groove is drawn smoothly and quickly in the inner periphery of the mounting hole of the member, the drive torque at the time of screwing is low, and the operability is good with simple handling. Since the second thread portion has a lower thread height than the first thread portion and is formed between the first thread portions with substantially the same lead angle with respect to the first thread portion, After screwing in, the second thread portion exhibits a large return torque, and a reliable holding force that can withstand external vibrations is obtained. In addition, since the multi-thread screw for preventing looseness is provided with one second thread portion between the first thread portions, the structure is simple and the manufacture is easy.

また、前記第１ねじ山部相互間に、前記第２ねじ山部が２条設けられているので、被取付部材に対する螺入時に、ねじ山高さが、高い第１ねじ山部は、被取付部材の取付孔の内周に円滑且つ迅速に螺旋溝を描いて食い込むから、螺入時のドライブトルクが低く、簡単な取扱いにて操作性が良く螺入が行える。そして、第２ねじ山部が、第１ねじ山部よりもねじ山高さが低く、前記第１ねじ山部間に第１ねじ山部に対して略同一のリード角により２条形成されているので、被取付部材の取付孔の内周に第２ねじ山部が螺入された後には、大ききな戻しトルクが発揮され、外部的な振動に耐え得る確実な保持力が得られるため、優れた緩み防止を発揮する。また、第１ねじ山部相互間に前記第２ねじ山部が２条設けられているので、構造が簡単であり、製作は容易である。 The front SL between the first screw crests cross because the second threaded section is provided Article 2, the threaded Nyutoki respect to the mounting member, the thread height is higher first threaded portion, the Since the spiral groove is drawn into the inner periphery of the mounting hole of the mounting member smoothly and quickly, the drive torque at the time of screwing is low, and screwing can be performed with good operability by simple handling. The second thread portion has a thread height lower than that of the first thread portion, and two strips are formed between the first thread portions with substantially the same lead angle with respect to the first thread portion. Therefore, after the second thread portion is screwed into the inner periphery of the mounting hole of the mounted member, a large return torque is exhibited, and a reliable holding force that can withstand external vibration is obtained. Exhibits excellent loosening prevention. Further, since the two second thread portions are provided between the first thread portions, the structure is simple and the manufacture is easy.

図１は本発明の緩み防止用の多条ねじの第１実施形態を示す正面図である。FIG. 1 is a front view showing a first embodiment of a multi-thread screw for preventing loosening of the present invention. 図２は同じく平面図である。FIG. 2 is also a plan view. 図３は同じく説明的な断面図である。FIG. 3 is also an explanatory sectional view. 図４同じく使用状態を示す説明的な拡大断面図である。4 is a descriptive enlarged cross-sectional view similarly showing the use state.

＜実施形態１＞
以下、図１乃至図４を参照し、本発明の実施の形態１について、詳細に説明する。 <Embodiment 1>
Hereinafter, the first embodiment of the present invention will be described in detail with reference to FIGS.

本実施形態１の緩み防止用の多条ねじは、図１、図２に示すように、軸体部３Ａの外周に、１条のねじ山よりなる多数の第１ねじ山部１と１条のねじ山よりなる多数の第２ねじ山部２とで構成された多条ねじであって、前記第１ねじ山部１,１・・・相互間に、前記第２ねじ山部２が設けられ、かつ、前記第１ねじ山部１の高さＨ１が、前記第２ねじ山部２の高さＨ２よりも高くされた多条ねじである点は、例えば特許文献に掲載の発明と同様である。 As shown in FIGS. 1 and 2, the multi-thread screw for preventing looseness according to the first embodiment has a large number of first thread portions 1 and 1 composed of one thread on the outer periphery of the shaft body portion 3A. A plurality of second thread portions 2 made of a plurality of screw threads, wherein the second thread portion 2 is provided between the first thread portions 1, 1. The point that the height H1 of the first screw thread portion 1 is higher than the height H2 of the second screw thread portion 2 is the same as the invention described in, for example, Patent Literature It is.

しかしながら、本実施形態１の緩み防止用の多条ねじは、前記第１ねじ山部１の山角αが、前記第２ねじ山部２の山角βよりも小さくされ、前記第１ねじ山部１のリード角θ１が、前記第２ねじ山部２のリード角θ２に略同一にされ、前記第１ねじ山部１が、その山頂部１ａから歯元部１ｂに向かって全体的として断面円弧状をなす滑らかな曲面側部４を有していることを特徴とする。 However, in the multi-thread screw for preventing looseness according to the first embodiment, the angle α of the first thread 1 is smaller than the angle β of the second thread 2, and the first thread 1 The lead angle θ1 of the portion 1 is made substantially the same as the lead angle θ2 of the second screw thread portion 2, and the first screw thread portion 1 has a cross section as a whole from the peak portion 1a toward the tooth root portion 1b. It has a smooth curved side portion 4 having an arc shape.

また、前記第２ねじ山部２のねじ山高さＨ２が、前記第１ねじ山部１のねじ山高さＨ１の略１／２以下にされている。 Further, the screw thread height H2 of the second screw thread portion 2 is set to be approximately ½ or less of the screw thread height H1 of the first screw thread portion 1.

そして、前記第１ねじ山部１の前記山角αが、１５度〜３０度に設定されることが好ましい。これは、前記第１ねじ山部１の前記山角αが、１４度以下であると、この山角αがより先鋭になることにより、第１ねじ山部１の歯先は被取付部材１０の取付孔１１への螺入時に、取付孔１１の内周に食い込み易くなり、螺入時のドライブトルクが低くなり、操作性が良く、螺入が行えるが、反面、第１ねじ山部１の歯先が先鋭になって大きなドライブトルクがかかると、第１ねじ山部１の強度が低下してカケや変形を生じて構造的に脆弱になるためである。また、前記第１ねじ山部１の山角αが、３１度以上であると、第１ねじ山部１の山角αが増大して強度が増すことにより、第１ねじ山部１の歯先は被取付部材１０の取付孔１１に対する摩擦力が増大して螺入時における、取付孔１１の内周への食い込みが悪くなり、ドライブトルクが高くなって操作性が悪くなり、反面、第１ねじ山部１の歯先が、カケ、変形を生ぜずに、構造的に堅牢になるためでる。さらに、好適にはこの実施形態１では、図示するように、第１ねじ山部１の山角αは、２０度にされることが好ましい。そして、ねじ山高さＨ１が、第２ねじ山部２のねじ山高さＨ２よりも高い第１ねじ山部１の山角αが、前述のように、１５度〜３０度に設定されて強度が確保された状態で雌ねじ孔は、被取付部材１０の内周に直接、タッピングされることにより形成され、緩み防止ねじ自体は、第２のねじ山部２のねじ山高さＨ２を第１ねじ山部１のねじ山高さＨ１よりも低くすることにより軽量化がはかれる。 And it is preferable that the said crest angle (alpha) of the said 1st thread part 1 is set to 15 to 30 degree | times. This is because when the angle α of the first thread 1 is 14 degrees or less, the angle α of the first thread 1 becomes sharper, so that the tooth tip of the first thread 1 becomes the attached member 10. When the screw is inserted into the mounting hole 11, it is easy to bite into the inner periphery of the mounting hole 11, the drive torque at the time of screwing is low, the operability is good, and the screw can be screwed in. This is because when the tooth tip becomes sharp and a large drive torque is applied, the strength of the first screw thread portion 1 is reduced, causing cracks and deformation, resulting in structural weakness. Further, if the angle α of the first thread 1 is 31 degrees or more, the angle α of the first thread 1 increases and the strength increases, so that the teeth of the first thread 1 are increased. First, the frictional force with respect to the mounting hole 11 of the mounted member 10 increases, and the biting into the inner periphery of the mounting hole 11 at the time of screwing becomes worse, the drive torque becomes higher and the operability becomes worse. This is because the tooth tip of one threaded portion 1 is structurally robust without causing cracks and deformation. Further, preferably, in the first embodiment, as shown in the drawing, it is preferable that the angle α of the first thread 1 is 20 degrees. And the thread angle H of the 1st thread part 1 whose thread height H1 is higher than the thread height H2 of the 2nd thread part 2 is set to 15 to 30 degree | times, as above-mentioned, and intensity | strength is. In the secured state, the female screw hole is formed by tapping directly on the inner periphery of the mounted member 10, and the loosening prevention screw itself has the thread height H 2 of the second screw thread portion 2 set to the first screw thread. The weight can be reduced by making it lower than the thread height H1 of the portion 1.

また、前記第２ねじ山部２の山角βが、６０度〜１００度にされることが好ましい。これは、前記第２ねじ山部２の山角βが、５９度以下であると、第２ねじ山部２の山角βが小さくなることにより、第２ねじ山部２は、被取付部材１０の取付孔１１への螺入時に、この取付孔１１の内周に食い込み易くなるが、取付孔１１の内周に対する接触面積が少なくなって摩擦係合力が小さくなり、被取付部材１０の取付孔１１の内周に対する保持力は小さくなる。また、前記第２ねじ山部２の山角βが、１０１度以上であると、第２ねじ山部２の山角βが大きくなることにより、第２ねじ山部２の被取付部材１０の取付孔１１への螺入時に、取付孔１１の内周に対する接触面積が増大し、摩擦係合力が大きくなり、被取付部材１０の取付孔１１の内周に対して大きな保持力を発揮するが、反面、第２ねじ山部２は取付孔１１の内周に食い込み難くなり、ドライブトルクが大きくなって操作性が低下するためである。さらに、好適にはこの実施形態１では、図示するように、第２ねじ山部１の山角βは、９０度にされることが好ましい。 Moreover, it is preferable that the crest angle β of the second screw thread portion 2 is set to 60 degrees to 100 degrees. This is because, when the crest angle β of the second thread 2 is 59 degrees or less, the crest angle β of the second thread 2 is reduced, so that the second thread 2 is attached to the mounted member. 10, when it is screwed into the mounting hole 11, it is easy to bite into the inner periphery of the mounting hole 11, but the contact area with respect to the inner periphery of the mounting hole 11 is reduced and the frictional engagement force is reduced. The holding force with respect to the inner periphery of the hole 11 becomes small. Moreover, when the crest angle β of the second screw thread portion 2 is 101 degrees or more, the crest angle β of the second screw thread portion 2 is increased, whereby the mounted member 10 of the second thread thread portion 2 is increased. At the time of screwing into the mounting hole 11, the contact area with respect to the inner periphery of the mounting hole 11 is increased, the frictional engagement force is increased, and a large holding force is exerted on the inner periphery of the mounting hole 11 of the mounted member 10. On the other hand, the second screw thread portion 2 is less likely to bite into the inner periphery of the mounting hole 11, and the drive torque increases and the operability decreases. Further, preferably, in the first embodiment, as shown in the drawing, the crest angle β of the second screw thread portion 1 is preferably 90 degrees.

この時、本実施形態１の緩み防止用ねじは、数サイズのものが用意され、例えば第１ねじ山部１のねじ外径φ１が１ｍｍの場合は、ねじ山高さＨ１は０．２ｍｍ、第２ねじ山部２のねじ山高さＨ２は０．０８ｍｍである。また、第１ねじ山部１のねじ外径φ１が５ｍｍの場合は、ねじ山高さＨ１は１．０ｍｍ、第２ねじ山部２のねじ山高さＨ２は０．４ｍｍである。また、第１ねじ山部１,１・・・間のピッチＰ１は、ねじ外径φ１が１ｍｍの場合は、０．６ｍｍであり、ねじ外径φ１が５ｍｍの場合は、３．０ｍｍである。そして、第２ねじ山部２,２・・・間のピッチＰ２は、ねじ外径φ１が１ｍｍの場合は、０．３ｍｍであり、ねじ外径φ１が５ｍｍの場合は、１．５ｍｍであるが、これらは例示であり、その増減変更は自由である。 At this time, the screws for preventing loosening of the first embodiment are prepared in several sizes. For example, when the screw outer diameter φ1 of the first threaded portion 1 is 1 mm, the thread height H1 is 0.2 mm. The screw thread height H2 of the two screw thread part 2 is 0.08 mm. When the screw outer diameter φ1 of the first thread portion 1 is 5 mm, the thread height H1 is 1.0 mm, and the thread height H2 of the second thread portion 2 is 0.4 mm. Further, the pitch P1 between the first screw thread portions 1, 1,... Is 0.6 mm when the screw outer diameter φ1 is 1 mm, and 3.0 mm when the screw outer diameter φ1 is 5 mm. . The pitch P2 between the second screw thread portions 2, 2,... Is 0.3 mm when the screw outer diameter φ1 is 1 mm, and 1.5 mm when the screw outer diameter φ1 is 5 mm. However, these are examples, and the increase / decrease change is free.

また、前記曲面側部４の曲率半径Ｒは、ねじ外径φ１が１ｍｍの場合は、０．１５５ｍｍであり、ねじ外径φ１が５ｍｍの場合は、０．７７５ｍｍであるが、これらは例示であり、その増減変更は自由である。 Further, the curvature radius R of the curved side portion 4 is 0.155 mm when the screw outer diameter φ1 is 1 mm, and 0.775 mm when the screw outer diameter φ1 is 5 mm. Yes, you can freely change it.

そして、図１、図２に示される本実施形態１では、前記第１ねじ山部１,１・・・相互間に、前記第２ねじ山部２が１条設けられている。 And in this Embodiment 1 shown by FIG. 1, FIG. 2, one said 2nd thread part 2 is provided between said 1st thread parts 1, 1 ....

３Ｂは前記軸体部３Ａの一側に設けられたねじ頭部である。また、３Ｃはねじ頭部３Ｂに設けられたリセスであり、このリセス３Ｃ内に図には示さないドライバの先端部が挿入されることにより本実施形態１の緩み防止用の多条ねじは回動操作される。 3B is a screw head provided on one side of the shaft body portion 3A. Reference numeral 3C denotes a recess provided in the screw head 3B, and the multi-thread screw for preventing loosening of the first embodiment is rotated by inserting a tip of a driver (not shown) into the recess 3C. Is operated.

また、前記被取付部材１０が、例えば、アルミニウム、マグネシウムのような軟らかい金属、または薄くて、塑性変形し易く、また、摩擦により発生される熱による熱的変形に弱い合成樹脂により形成されている。また、この合成樹脂としては、例えばアクリル樹脂、ポリエチレン樹脂、ポリスチレン樹脂、ポリプロピレン樹脂、ポリカーボネート樹脂、ポリアミド樹脂のほか、前記何れかから選ばれる合成樹脂に炭素繊維、ガラス繊維、金属繊維の何れかが混入されたものが使用されるが、これらは代表的な例示である。 Moreover, the mounted member 10, For example, A aluminum, soft metal such as magnesium or thin, plastically deformed easily, also formed by a weak synthetic resin thermal deformation due to heat generated by friction ing. As this synthetic resin, for example, acrylic resin, polyethylene resin, polystyrene resin, polypropylene resin, polycarbonate resin, polyamide resin, as well as any synthetic resin selected from the above, either carbon fiber, glass fiber, or metal fiber is used. Mixed materials are used, but these are representative examples.

本実施形態１の緩み防止用の多条ねじは以上の構成のように、１条のねじ山よりなる多数の第１ねじ山部１と１条のねじ山よりなる多数の第２ねじ山部２とで構成された多条ねじであって、前記第１ねじ山部１,１・・・相互間に、前記第２ねじ山部２が設けられ、かつ、前記第１ねじ山部１の高さＨ１が、前記第２ねじ山部２の高さＨ２よりも高くされた２条ねじであり、この２条ねじは、前記第１ねじ山部１の山角αが、前記第２ねじ山部２の山角βよりも小さくされ、前記第１ねじ山部１のリード角θ１が、前記第２ねじ山部２のリード角θ２に略同一にされ、前記第１ねじ山部１が、その山頂部１ａから歯元部１ｂに向かって全体的として断面円弧状をなす滑らかな曲面側部４を有しているので、ねじ頭部３Ｂに設けたリセス３Ｃ内に図には示さないが、ドライバの先端部を挿入して回動操作する被取付部材１０に対する螺入時に、例えば第１ねじ山部１のねじ外径φ１が１ｍｍの場合は、第２ねじ山部２のねじ山高さＨ２が０．０８ｍｍに対してねじ山高さＨ１は０．２ｍｍと、また、ねじ外径φ１が５ｍｍの場合は、第２ねじ山部２のねじ山高さＨ２が０．４ｍｍであるのに対してねじ山高さＨ１は１．０ｍｍと高く形成されている第１ねじ山部１の歯先は、先鋭な山角αを有して薄く形成されて抵抗が少ないため、被取付部材１０の取付孔１１の内周に円滑且つ迅速に螺旋溝が描かれて食い込んで行くから、螺入時のドライブトルクが低く、簡単な取扱いにて操作性が良く螺入が行える。 As described above, the multi-thread screw for preventing looseness according to the first embodiment has a large number of first screw threads 1 composed of one thread and a large number of second thread threads composed of a single thread. 2, wherein the second thread portion 2 is provided between the first thread portions 1, 1..., And the first thread portion 1 A height H1 is a double thread having a height H2 higher than a height H2 of the second thread 2, and the thread angle α of the first thread 1 is the second thread. The lead angle θ1 of the first screw thread portion 1 is made substantially the same as the lead angle θ2 of the second screw thread portion 2, and the first screw thread portion 1 is Since it has a smooth curved side 4 having an arcuate cross-section as a whole from the peak 1a to the root 1b, the figure is shown in a recess 3C provided in the screw head 3B. Although not shown, when the screw outer diameter φ1 of the first screw thread portion 1 is 1 mm at the time of screwing into the member 10 to be rotated by inserting the tip of the driver, for example, the second screw thread portion 2 When the thread height H2 is 0.08 mm and the thread height H1 is 0.2 mm, and the thread outer diameter φ1 is 5 mm, the thread height H2 of the second thread portion 2 is 0.4 mm. On the other hand, the tooth height of the first thread portion 1 that is formed to be as high as 1.0 mm as the thread height H1 is formed thin with a sharp angle α and has low resistance. Since the spiral groove is drawn smoothly and quickly on the inner periphery of the mounting hole 11 of the member 10, the drive torque at the time of screwing is low, and the screwing can be performed with good operability by simple handling.

この時、前記第１ねじ山部１の山角αが、鋭い鋭角、具体的には、前記第１ねじ山部１の山角αが、１５度〜３０度、さらに好ましくは、２０度に形成されて前述のように、ねじ山高さＨ１が高く形成されているとともに、前記第２ねじ山部２の山角βが、前記第１ねじ山部１の山角αよりも大きく、６０度〜１００度、さらに好ましくは９０度に形成されているので、抵抗力が増し、しかも、ねじ山高さＨ２が第１ねじ山部１のねじ山高さＨ１の略１／２以下と低いので、ねじ山高さＨ１が高く、その山角αが鋭い鋭角により形成された第１ねじ山部１が、被取付部材１０に設けた取付孔１１の内周に円滑且つ迅速に螺旋溝を描いて食い込むから、本実施形態１の緩み防止用の多条ねじは、被取付部材１０に対する螺入時に、ねじ頭部３Ｂに設けたリセス３Ｃ内にドライバの先端部を挿入して回動操作することにより、ドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行える。 At this time, the crest angle α of the first thread portion 1 is a sharp acute angle, specifically, the crest angle α of the first thread portion 1 is 15 degrees to 30 degrees, more preferably 20 degrees. As described above, the thread height H1 is high, and the thread angle β of the second thread part 2 is larger than the thread angle α of the first thread part 1 and is 60 degrees. Since it is formed at -100 degrees, more preferably 90 degrees, the resistance is increased, and the screw thread height H2 is as low as about ½ or less of the thread height H1 of the first screw thread portion 1, so that the screw The first screw thread portion 1 formed with a high peak height H1 and a sharp angle of the peak angle α smoothly and quickly bites into the inner periphery of the mounting hole 11 provided in the mounted member 10. The multi-thread screw for preventing looseness according to the first embodiment is installed in the screw head 3B when screwed into the mounted member 10. By inserting the tip of the driver into the key recess 3C and turning it, the drive torque is low and the screw can be screwed in with easy handling.

そして、第１ねじ山部１が、山頂部１ａから歯元１ｂに向かって全体的として断面円弧状をなす滑らかな曲面側部４を設けているので、この山頂部１ａから歯元１ｂに向かって全体的として断面円弧状をなした曲面側部４が、被取付部材１０の取付孔１１の内周に対して大きな接触面積により接触することにより、摩擦係合力が大きくなり、さらに、曲面側部４が、被取付部材１０の取付孔１１の内周に対して静水圧がかかることで、強度をもたせることができるから、大きな保持力を発揮する。 And since the 1st thread part 1 has provided the smooth curved side part 4 which makes a cross-sectional arc shape as a whole toward the root 1b from the peak 1a, it goes to the root 1b from this peak 1a. As a result, the curved side portion 4 having an arcuate cross section as a whole comes into contact with the inner periphery of the mounting hole 11 of the mounted member 10 with a large contact area, so that the frictional engagement force is increased. Since the part 4 can give strength by applying a hydrostatic pressure to the inner periphery of the mounting hole 11 of the mounted member 10, it exerts a large holding force.

例えば、第１ねじ山部１が、山頂部１ａから歯元１ｂに向かって全体的として断面円弧状をなす滑らかな曲面側部４は、その曲率半径Ｒが、ねじ外径φ１が１ｍｍの場合は、０．１５５ｍｍであり、また、ねじ外径φ１が５ｍｍの場合は、０．７７５ｍｍであり、被取付部材１０の取付孔１１の内周に対する接触面積は増大される。 For example, the smooth curved side portion 4 in which the first screw thread portion 1 forms an overall cross-sectional arc shape from the summit portion 1a toward the tooth root 1b has a curvature radius R and a screw outer diameter φ1 of 1 mm. Is 0.155 mm, and when the screw outer diameter φ1 is 5 mm, it is 0.775 mm, and the contact area with respect to the inner periphery of the mounting hole 11 of the mounted member 10 is increased.

そして、第２ねじ山部２は、前述のように第１ねじ山部１よりもねじ山高さＨ１が低く、かつ第１ねじ山部１の山角αより山角βが大きく、しかも、第２ねじ山部２は、前記第１ねじ山部１,１・・・間にそのリード角θ２が、第１ねじ山部１のリード角θ１に略同一にされているので、第１ねじ山部１が被取付部材１０に螺入されるのに伴い、第２ねじ山部２が被取付部材１０の取付孔１１の内周に対して大きな接触面積により接触されて螺入されるのと、前記曲面側部４が、被取付部材１０の取付孔１１の内周に静水圧がかかることにより、強度をもたせて食い込まれるのとから、大きな戻しトルクが発揮され、外部的な振動に耐えて確実な保持力が得られるため、優れた緩み防止を発揮する。 The second screw thread portion 2 has a screw thread height H1 lower than that of the first screw thread portion 1 as described above, and has a thread angle β larger than the thread angle α of the first screw thread portion 1, and Since the lead angle θ2 of the two screw thread portions 2 is substantially the same as the lead angle θ1 of the first screw thread portion 1 between the first screw thread portions 1, 1,. As the portion 1 is screwed into the mounted member 10, the second screw thread portion 2 is screwed into contact with the inner periphery of the mounting hole 11 of the mounted member 10 with a large contact area. Since the curved side portion 4 is encroached with strength by applying hydrostatic pressure to the inner periphery of the mounting hole 11 of the mounted member 10, a large return torque is exerted and it can withstand external vibration. It provides excellent holding power and provides excellent anti-loosening properties.

そして、本実施形態１の緩み防止用の多条ねじによれば、前述のように、第１ねじ山部
１が、山頂部１ａから歯元１ｂに向かって全体的として断面円弧状をなす滑らかな曲面側
部４が、前記第１ねじ山部１よりもねじ山高さＨ２が低く、前記第１ねじ山部１,１・・
間に形成された第２ねじ山部２に向かって設けられているので、図４に示す如く取付部材
１０に設けられた取付孔１１の内周に第１ねじ山部１が螺入されて食い込まれ、雌ねじ孔
が形成されて行く時に生ずる切削屑は、第１ねじ山部１に、山頂部１ａから歯元１ｂに向
かって全体的として断面円弧状をなす滑らかな曲面側部４に沿って抵抗が軽減されて円滑
に誘導されるため、緩み防止用の多条ねじとしてのタッピングねじの回転操作時に、タッ
ピングされる被取付部材１０の雌ねじ孔が第１ねじ山部１によるタッピングにより破壊さ
れて分断されたり、変形して形崩れがない。このため、緩み防止ねじの螺退時に、雌ねじ
孔が綺麗な仕上がりのまま、緩み防止ねじは螺退されるから、再び雌ねじ孔内に緩み防止
用ねじを螺入した場合に、迅速かつ確実に緩み防止用ねじを螺入して再使用をすることが
できる。そして、特許文献に記載の従来のロックねじとは異なり、雌ねじ孔と第１ねじ山
部１、および第２ねじ山部２との間の隙間が大きくなり、ねじが緩み易くなるという不都
合はない。従って、本実施形態１の緩み防止ねじは、例えば、アルミニウムのように軽量であり、かつ軟らかい金属、また、被取付部材１０が薄くて、塑性変形し易く、また、摩擦により発生される熱による熱的変形に弱い合成樹脂等の、種々の異なる材料に使用する場合に、螺入時のドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行え、大きな曲率半径Ｒの末広がりの曲面側部４が、被取付部材１０の取付孔１１の内周に対して静水圧がかかることで、強度をもたせることができるので、大きな保持力を発揮し、第２ねじ山部２が雌ねじ孔に摩擦係合することにより、大きな戻しトルクが発揮され、外部的な振動に耐えて確実な保持力が得られるため、優れた緩み防止を発揮する。そして、例えば自動車であるとか、家電製品の洗濯機のような振動を生ずるものの緩みを防止するのに最適に使用できるほか、電子機器部品、複写機等の事務用機器、さらには、デジタルカメラのような光学機器、携帯電話器等、精密機器の部品の取付に最適に使用される。 Then, according to the multi-thread screw for preventing loosening of the first embodiment, as described above, the first screw thread portion 1 is smoothly formed in a circular arc shape as a whole from the peak portion 1a toward the tooth root 1b. The curved surface portion 4 has a thread height H2 lower than that of the first thread portion 1, and the first thread portions 1, 1,.
Since it is provided toward the second screw thread portion 2 formed therebetween, the first screw thread portion 1 is screwed into the inner periphery of the mounting hole 11 provided in the mounting member 10 as shown in FIG. The cutting waste generated when the female screw hole is bitten is formed along the smooth curved side portion 4 having a circular arc shape as a whole in the first screw thread portion 1 from the peak portion 1a toward the tooth root 1b. Therefore, when the tapping screw as a multi-thread for preventing loosening is rotated, the female screw hole of the member 10 to be tapped is destroyed by tapping by the first thread portion 1. It is divided and deformed and it does not lose its shape. For this reason, when the loosening prevention screw is screwed back, the loosening prevention screw is screwed back with the beautiful finish of the female screw hole, so that when the loosening prevention screw is screwed into the female screw hole again, it can be done quickly and reliably. Screws for preventing loosening can be screwed in for reuse. And unlike the conventional lock screw described in the patent document, there is no inconvenience that the clearance between the female screw hole and the first screw thread portion 1 and the second screw thread portion 2 becomes large and the screw is easily loosened. . Thus, anti-loosening screw of the present embodiment 1, For example, a lightweight as A aluminum and soft metal also, thin is the mounting member 10, plastically deformed easily, also be generated by friction When used for a variety of different materials such as synthetic resins that are vulnerable to thermal deformation due to heat, the drive torque at the time of screwing is low and the screw can be screwed in easily with easy handling, and the end of the large radius of curvature R is widened. Since the curved side portion 4 can be given strength by applying a hydrostatic pressure to the inner periphery of the mounting hole 11 of the mounted member 10, it exerts a large holding force, and the second threaded portion 2 is By frictional engagement with the female screw hole, a large return torque is exhibited, and a reliable holding force can be obtained withstanding external vibrations. It can be optimally used to prevent loosening of products that generate vibrations, such as automobiles and washing machines for home appliances, as well as electronic equipment parts, office equipment such as copiers, and digital cameras. optical instruments, such as, a portable telephone, is optimally used in the component mounting precision equipment.

なお、上記説明では、第１ねじ山部１,１・・相互間に、第２ねじ山部２が１条設けられた２条ねじにつき代表的に説明したが、本発明はこれに限ることなく、図には示さないが、第１ねじ山部１,１・・相互間に、第２ねじ山部２が複数条、例えば２条設けられた場合にも適用でき、被取付部材１０に対する螺入時に、ねじ山高さＨ１が高い第１ねじ山部１,１・・の歯先は、被取付部材１０の取付孔１１の内周に円滑且つ迅速に螺旋溝を描いて食い込むから、螺入時のドライブトルクが低く簡単な取扱いにて操作性が良く螺入が行える。そして、この実施形態では、第２ねじ山部２は、第１ねじ山部１のねじ山高さＨ１よりもねじ山高さＨ２が低く、前記第１ねじ山部１,１・・間に、この第１ねじ山部１,１・・のリード角θ１に対して略同一のリード角θ２により２条形成されているので、緩み防止用ねじの螺入後においては、第２ねじ山部２が大きな戻しトルクを発揮し、外部的な振動に耐え得る確実な保持力が得られるため、優れた緩み防止を発揮することができる。そして、第１ねじ山部１,１・・相互間に、前記第２ねじ山部２が２条設けられた３条ねじなので、構造が簡単であり、製作は容易であるという効果を奏する。 In the above description, the two-thread screw in which one second thread portion 2 is provided between the first thread portions 1, 1... Is representatively described, but the present invention is not limited to this. Although not shown in the drawings, the present invention can also be applied to a case where a plurality of second thread portions 2 are provided between the first thread portions 1, 1. At the time of screwing, since the tooth tip of the first threaded portion 1, 1... Having a high thread height H1 smoothly and quickly bites into the inner periphery of the mounting hole 11 of the mounted member 10, The drive torque at the time of turning on is low and easy handling makes it easy to screw. In this embodiment, the second screw thread portion 2 has a screw thread height H2 lower than the screw thread height H1 of the first screw thread portion 1, and between the first screw thread portions 1, 1,. Since the two threads are formed with the lead angle θ2 that is substantially the same as the lead angle θ1 of the first thread portions 1, 1,..., The second thread portion 2 is Since a large holding torque that can withstand external vibrations can be obtained by exhibiting a large return torque, it is possible to exhibit excellent prevention of looseness. And since the said 2nd screw thread part 2 is a 3 thread | screw provided between the 1st thread thread parts 1,1, ..., there exists an effect that a structure is simple and manufacture is easy.

本発明は、アルミニウムのように軽量であり、かつ軟らかい金属や合成樹脂等の材料に使用するのに最適であり、被締結部材に対する螺入時のドライブトルクが低く、簡単な取扱いにて操作性が良く螺入が行え、また、螺入後の緩み防止に優れ、大きな戻しトルクにより、振動に耐え得る確実な保持力が得られ、さらには構造的な強度が大きく、製作するのにも量産可能で製作コストが安価になるという用途・機能に適する。 The present invention is optimal for use on materials such as aluminum, which are lightweight and soft, such as aluminum, and has low drive torque when screwed into a fastened member and is easy to operate with easy handling. It can be screwed in well, is excellent in preventing loosening after screwing in, and a large return torque provides a reliable holding force that can withstand vibrations. Furthermore, it has high structural strength and is mass-produced for manufacturing. Suitable for applications and functions that can be manufactured at low cost.

１第１ねじ山部
１ａ山頂部
１ｂ歯元部
２第２ねじ山部
３Ａ軸体部
４曲面側部
１０被取付部材
１１取付孔
Ｒ曲率半径
α 山角
β 山角 DESCRIPTION OF SYMBOLS 1 1st thread part 1a Summit part 1b Root part 2 2nd thread part 3A Shaft part 4 Curved surface part 10 Mounted member 11 Mounting hole R Radius of curvature α Mountain angle β Mountain angle

Claims

A multi-thread that is composed of a spiral first thread portion made of one thread and a second thread portion made of one or a plurality of threads, and is used for mounting precision equipment parts. A screw,
In the multi-thread screw in which the second thread portion is provided between the first thread portions, and the height of the first thread portion is higher than the height of the second thread portion. ,
The first mountain angle of the first threaded portion is smaller than the second crest angle of the second thread,
The first thread portion is composed of a first slope that forms the first slope, and a second slope that is continuous with the first slope and is configured to have a curvature,
The second thread portion is constituted by a third slope that is continuous with the second slope and forms the second angle;
The lead angle of the second slope is substantially the same as the lead angle of the third slope ;
The first screw thread portion has a smooth curved side portion that forms a circular arc section as a whole toward a tooth root portion that is a boundary between the second slope surface and the third slope surface from the peak portion. A multi-thread screw for preventing looseness.

The multi-thread screw for preventing loosening according to claim 1, wherein a crest angle of the first screw thread portion is set to 15 to 30 degrees .

The thread height of the said 2nd thread part is made into about 1/2 or less of the thread height of the said 1st thread part, The prevention for loosening of Claim 1 or Claim 2 characterized by the above-mentioned. Multi-threaded screw.

The multi-thread screw for preventing loosening according to any one of claims 1 to 3, wherein a crest angle of the second screw thread portion is set to 60 degrees to 100 degrees.