JP2002349536A - Locking screw - Google Patents
Locking screwInfo
- Publication number
- JP2002349536A JP2002349536A JP2001163907A JP2001163907A JP2002349536A JP 2002349536 A JP2002349536 A JP 2002349536A JP 2001163907 A JP2001163907 A JP 2001163907A JP 2001163907 A JP2001163907 A JP 2001163907A JP 2002349536 A JP2002349536 A JP 2002349536A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- thread
- locking
- leg
- female screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Dowels (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、被締結物としての
ワークあるいはナットとの締結において、ねじと被締結
物の雌ねじ穴との間で締結作用の緩みが生じないように
する緩み止めねじに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking screw for preventing loosening of a fastening action between a screw and a female screw hole of a workpiece when the workpiece or nut is fastened to the workpiece. .
【0002】[0002]
【従来の技術】ナットあるいはワークの雌ねじ穴にねじ
を締結し、このねじが雌ねじ穴から緩まないようにした
緩み止めねじの構造としては、従来から各種のものが採
用されている。このような緩み止め構造としては、例え
ば、ねじ込まれたねじの脚部の雄ねじが雌ねじ穴から突
出している部分にEリング(図示せず)等の抜け止め部
材を嵌め合わせたものや、雌ねじ穴にねじ込まれる脚部
にあらかじめ樹脂を貼り付けてこれで雌ねじとの間に緩
み止め作用を働かせるようにしたものが使用されてい
る。これらはねじの他に抜け止め部材や樹脂等の緩み止
め部材が必要となることから部品点数が多くなっていた
り、製造工数の増加や組み立て工数の増加等の問題が発
生していた。2. Description of the Related Art Conventionally, various types of loosening screws have been employed as a structure of a locking screw in which a screw is fastened to a female screw hole of a nut or a work to prevent the screw from being loosened from the female screw hole. Examples of such a loosening prevention structure include a structure in which a retaining member such as an E-ring (not shown) is fitted to a portion of a screwed screw leg where a male screw projects from a female screw hole, or a female screw hole. A resin is previously applied to a leg portion to be screwed into the female screw so as to act as a locking action with a female screw. These require a locking member such as a resin or a loosening member in addition to the screw, so that the number of parts is increased, and the number of manufacturing steps and the number of assembling steps are increased.
【0003】このような問題を解消するために最近で
は、図8及び図9に示すように、雌ねじ穴121にねじ
をねじ込む際に脚部103の雄ねじと雌ねじ穴121と
の間でこれらを互いに接触させて緩まないようにするた
めに、脚部103の雄ねじのねじ山110の形状を変形
させたものが使用されつつある。特に、図8には雌ねじ
穴121のねじ山の形状に沿う脚部103の雄ねじのね
じ山頂角が60°のねじ山頂部にスリット114を形成
したものが示されている。これはこの雄ねじを雌ねじ穴
121にねじ込んだ時に雄ねじねじ山110のフランク
面が雌ねじのフランク面に接する時に弾発力を有するよ
うにして緩み止め作用を生じるようにしたものである。
また、図9には脚部103の雄ねじねじ山110の両側
のフランク面が夫々傾斜角の異なる斜面となっており、
これにより、ねじ山110の頂部が雌ねじに僅かに食い
込むようにして緩み止め力を発生させるようにしてい
る。In order to solve such a problem, recently, as shown in FIGS. 8 and 9, when a screw is screwed into the female screw hole 121, the male screw and the female screw hole 121 of the leg 103 are connected to each other. In order to prevent the screws from loosening due to the contact, a modified shape of the external thread 110 of the leg portion 103 is being used. In particular, FIG. 8 shows a case in which a slit 114 is formed at the crest of the male screw of the leg portion 103 having a crest angle of 60 ° along the shape of the crest of the female screw hole 121. This is so that when this male screw is screwed into the female screw hole 121, the flank surface of the male screw thread 110 has a resilient force when coming into contact with the flank surface of the female screw, so that a loosening prevention action is produced.
In FIG. 9, the flank surfaces on both sides of the external thread 110 of the leg portion 103 are inclined surfaces having different inclination angles, respectively.
As a result, the top portion of the thread 110 slightly bites into the female screw to generate a locking force.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うに、雄ねじのねじ山にスリットを形成したり、一つの
ねじ山を形成する両側のフランク面を異なる角度で形成
して、このねじを被締結物の雌ねじ穴にねじ込むように
した場合は、これら緩み止め作用を生じる部分は全てね
じ山の有効径から外側のねじ山外径部分に位置してい
る。一方、このねじがねじ込まれるナットやワーク等の
被締結物に形成されている雌ねじ穴は通常、雌ねじのね
じ山内径はJIS(日本工業規格)で規定されて寸法が
夫々規定されているが、この雌ねじの谷径は特には規定
されておらず、一般にはねじ込まれる雄ねじの呼び寸法
に対応するねじ山外径が嵌る程度であれば良いとされて
おり、雌ねじの谷径は雄ねじの外径と同径のものもあれ
ば、外径より大きく形成されているものもある。However, as described above, a slit is formed in the thread of the external thread, or the flank surfaces on both sides forming one thread are formed at different angles, and the screw is fastened to the thread. When screwing into a female screw hole of an object, all of the portions that cause the locking action are located at the outer thread portion outside the effective diameter of the thread. On the other hand, a female screw hole formed in a workpiece such as a nut or a work into which the screw is screwed usually has a female screw thread inner diameter defined by JIS (Japanese Industrial Standards), and the dimensions are respectively specified. The root diameter of the female screw is not particularly specified, and it is generally considered that it is sufficient that the outer diameter of the thread corresponding to the nominal size of the male screw to be screwed is fitted. Some have the same diameter, while others have a diameter larger than the outer diameter.
【0005】このため、雄ねじとの嵌め合いが通常のも
のであれば、何らの問題も生じないが、緩み止め作用を
生じるようにした場合は、その被締結物の雌ねじ穴によ
っては、緩み止め作用が不十分であった。これを解消す
るために雄ねじ寸法を大きくすると、ねじ込み時におけ
るねじ込みトルクが設定値より高くなって、十分にねじ
込まれずにねじ浮き状態が発生したり、反対に緩み止め
トルクが不十分になる等、安定した緩み止め効果が得ら
れていない。また、緩み止め効果を確実に得るために被
締結物の雌ねじ穴の谷径の寸法が一定のものをあらかじ
め選定して、この谷径に合う外径を有するねじも選定す
る必要があり、ねじと雌ねじ穴の呼び寸法が一致するか
ら必ずしも所望の効果が得られるとは限らない等の課題
が発生している。[0005] For this reason, if the fitting with the male screw is normal, there is no problem. However, when the locking action is provided, depending on the female screw hole of the article to be fastened, the locking may be prevented. The effect was insufficient. If the external thread size is increased to solve this, the screwing torque at the time of screwing will be higher than the set value, and the screw will not be screwed sufficiently, causing a screw floating state, or conversely, the loosening torque will be insufficient, etc. Stable locking effect has not been obtained. In addition, in order to surely obtain the loosening prevention effect, it is necessary to select in advance a thread having a fixed root diameter of the female screw hole of the object to be fastened, and to select a screw having an outer diameter matching this root diameter. There is a problem that the desired effect is not always obtained because the nominal dimensions of the screw hole and the female screw hole match.
【0006】これらはいずれも雄ねじのねじ山とこれに
対応してねじ込まれる雌ねじ穴の谷部との関係において
緩み止め作用を得るように工夫された結果であり、JI
Sで規定されている雌ねじ穴の内径に着目したものでは
ないことに起因している。例えば、JISB0209に
おいては、ねじの呼び寸法毎に雌ねじの内径及び有効径
等の最大、最小値が規定されているが、谷径については
その最大、最小値は規定されていない。このため、雌ね
じ穴を有するナット等の製造者により使い勝手のよい谷
径となっているのが現状である。All of these are the results of devising a locking effect in relation to the thread of the male screw and the valley of the female screw hole to be screwed correspondingly.
This is because the focus is not on the inner diameter of the female screw hole defined by S. For example, in JIS B0209, the maximum and minimum values such as the inner diameter and the effective diameter of the female screw are specified for each nominal size of the screw, but the maximum and minimum values are not specified for the root diameter. For this reason, it is the present condition that the valley diameter is easy to use by a manufacturer such as a nut having a female screw hole.
【0007】本発明の目的は、前記課題を解消するとと
もにこのようなJISに規定された雌ねじ穴の内径に着
目してねじと被締結物の雌ねじ穴との嵌め合わせにおい
て安定した緩み止め作用が得られるようにした緩み止め
ねじを得ることである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a stable loosening preventing action in fitting a screw and a female screw hole of an object to be fastened by focusing on the inner diameter of the female screw hole specified in JIS. The objective is to obtain a locking screw that is made available.
【0008】[0008]
【課題を解決するための手段】本発明の目的は、頭部2
にドライバビットが係合する駆動部を有し、駆動部に係
合してねじ込み力が与えられる脚部3に雄ねじを形成し
たねじにおいて、脚部3の断面形状を略三角形状に形成
し、この脚部3に形成された雄ねじの略三角形状の谷部
11が回転することにより、谷部11にある突部12が
描く回転軌跡円直径を被締結物20にあらかじめ形成さ
れている雌ねじ穴21の内径と同径かあるいはこれより
も僅か大きく形成し、しかも、前記雄ねじのねじ山頂角
を雌ねじを形成するねじ山とねじ山との間の谷角より小
さい構成とした緩み止めねじを提供することで達成され
る。また、この目的は、前記構成に加えて、谷部11に
形成されている突部12は脚部3の軸線に対して直交す
る断面において、その円周上に等間隔を有して設けられ
ている緩み止めねじであっても達成される。更に、前記
目的を達成するために、ねじの脚部3の谷部11は互い
に隣り合う突部12と突部12との間に被締結物20の
雌ねじ穴21の内径に接触しない谷面13を有している
緩み止めねじとしてもよい。しかも、これら構成に加え
て、雄ねじのねじ山頂角は30°である緩み止めねじと
することにより、緩み止め作用がより確実となる。The object of the present invention is to provide a head 2
A screw formed by forming a male screw on a leg 3 to which a screwing force is applied by engaging the driver with a driver bit, wherein the cross-sectional shape of the leg 3 is substantially triangular; By rotating the substantially triangular valley 11 of the male screw formed on the leg 3, the diameter of the rotation trajectory circle drawn by the protrusion 12 in the valley 11 is changed into a female screw hole formed in the workpiece 20 in advance. The present invention provides a locking screw which is formed to have the same diameter as or slightly larger than the inner diameter of the inner screw 21 and the crest angle of the male screw is smaller than the root angle between the threads forming the female screw. It is achieved by doing. In addition to this, in addition to the above configuration, the projections 12 formed in the valleys 11 are provided at equal intervals on the circumference thereof in a cross section orthogonal to the axis of the leg 3. This is achieved even with loose locking screws. Further, in order to achieve the above-mentioned object, the valley 11 of the screw leg 3 is provided between the protrusions 12 adjacent to each other, and the valley surface 13 which does not contact the inner diameter of the female screw hole 21 of the workpiece 20. May be used as a locking screw. Moreover, in addition to these configurations, by using a locking screw in which the external thread has a crest angle of 30 °, the locking function can be more reliably performed.
【0009】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図1
乃至図7に基づき説明する。図2及び図3において、1
は頭部2とこの頭部2と一体で且つ外周にねじ山10を
有する雄ねじ形状の脚部3とからなる緩み止めねじであ
る。この緩み止めねじ1の頭部2には脚部3の中心線上
にドライバビット(図示せず)と係合して駆動部を構成
する十字円錐溝形状の駆動穴4が形成されている。この
頭部2の駆動部は十字円錐溝形状の駆動穴4であるが、
この他に、例えば、四角、六角形状あるいはその他の溝
あるいは穴形状であってもよく、一般に普及している形
状であれば、これに制限されるものではない。FIG. 1 is a block diagram showing an embodiment of the present invention.
7 through FIG. 2 and 3, 1
Is a locking screw comprising a head 2 and a male screw-shaped leg 3 integral with the head 2 and having a thread 10 on the outer periphery. The head 2 of the locking screw 1 has a driving hole 4 in the shape of a cruciform conical groove which is engaged with a driver bit (not shown) on the center line of the leg 3 to form a driving unit. The driving portion of the head 2 is a driving hole 4 having a cross-conical groove shape.
In addition, for example, the shape may be a square, a hexagon, or another groove or a hole, and the shape is not limited to this as long as the shape is commonly used.
【0010】また、この頭部2には、これに連続して頭
部2より小径で断面が略三角形状の脚部3が一体に形成
してあり、この脚部3にはねじ山10が所定のピッチを
有して成形されている。この脚部3の雄ねじはそのねじ
山頂角がナットあるいはワーク等の被締結物20に形成
されている図1及び図4に示すような雌ねじ穴21のね
じ山を形成する両側フランク面がなす谷角より小さい角
度αで形成してあり、この実施例ではこの角度αは30
°に形成されている。このため、雄ねじのねじ山10の
基部の厚みは通常より薄くなっており、ねじ山10のピ
ッチは変わらないが、ねじ山10の谷の幅は僅か広く形
成されている。The head 2 is formed integrally with a leg 3 having a diameter smaller than that of the head 2 and a substantially triangular cross section, and a thread 10 is formed on the leg 3. It is formed with a predetermined pitch. The male screw of the leg 3 has a crest angle formed by a flank on both sides forming a screw thread of a female screw hole 21 as shown in FIGS. Is smaller than the angle α, and in this embodiment, the angle α is 30 degrees.
° formed. For this reason, the thickness of the base of the thread 10 of the external thread is thinner than usual, and the pitch of the thread 10 does not change, but the width of the root of the thread 10 is formed slightly wider.
【0011】一方、図2及び図6に示すように、この脚
部3に形成されているねじ山10及び谷部11はその脚
部3の軸線に直交する断面において略三角形状となって
おり、この略三角形状の谷部11の等分割された三ヶ所
には曲率半径の小さい円弧となった突部12が設けら
れ、この突部12と突部12の間は曲率半径の大きい円
弧形状の谷面13で接続されている。一方、ねじ山も同
様に曲率半径の小さい突山部14を三ヶ所に形成し、こ
の間を曲率半径の大きい円弧で接続された略三角形状と
なっている。尚、この図6の断面を示す境界線は実際に
はその一部がねじ山10の頂部に達するもので、即ち、
二点鎖線で示された輪郭断面となるものであるが、略三
角形状の雄ねじと円形の雌ねじ穴21との嵌め合わせに
ついての理解を容易にするために、説明の便宜上このよ
うに図示する。On the other hand, as shown in FIGS. 2 and 6, the thread 10 and the valley 11 formed on the leg 3 are substantially triangular in cross section orthogonal to the axis of the leg 3. An arc-shaped projection 12 having a small radius of curvature is provided at three equally-divided portions of the substantially triangular valley 11, and an arc shape having a large radius of curvature is provided between the projections 12. Are connected by a valley surface 13. On the other hand, the thread has a substantially triangular shape in which protrusions 14 each having a small radius of curvature are similarly formed at three places, and these are connected by an arc having a large radius of curvature. Note that the boundary line showing the cross section of FIG. 6 is actually a part of the boundary line reaching the top of the thread 10, that is,
Although it has a contour cross section indicated by a two-dot chain line, it is illustrated in this manner for convenience of explanation in order to facilitate understanding of the fitting of the substantially triangular male screw and the circular female screw hole 21.
【0012】図4に示すように、このねじ山10の脚部
中心から突山部14先端までの長さHは被締結物20に
形成された雌ねじ穴21の中心から谷までの長さDより
短いかあるいは僅かに長い寸法となっており、脚部3の
ねじ山10の突山部14は雌ねじ穴21の谷部22に接
触しないこともあれば、図5に示すように、接触した
り、食い込んだりすることもある。一方、脚部3の中心
から谷部11の突部12までの長さhは被締結物20の
雌ねじ穴21の中心から雌ねじの内径までの長さdと同
径かあるいはこれよりも僅かに大きい寸法に設定されて
おり、このため、図6に示すように、この突部12が回
転することにより形成される回転軌跡円(一点鎖線)は
雌ねじの内径(破線)と同径かあるいはこれより僅かだ
け大きい直径となっている。これにより、三ヶ所の突部
12は雌ねじの内径に常時接触可能となっている。As shown in FIG. 4, the length H from the center of the leg of the screw thread 10 to the tip of the protrusion 14 is the length D from the center of the female screw hole 21 formed in the work 20 to the root. The length is shorter or slightly longer, and the ridge 14 of the thread 10 of the leg 3 may not contact the valley 22 of the female screw hole 21, or as shown in FIG. Or dig into it. On the other hand, the length h from the center of the leg 3 to the protrusion 12 of the valley 11 is equal to or slightly smaller than the length d from the center of the female screw hole 21 of the workpiece 20 to the inner diameter of the female screw. As shown in FIG. 6, the rotation locus circle (dashed line) formed by the rotation of the projection 12 has the same diameter as the inner diameter (dashed line) of the internal thread or has a larger diameter. It has a slightly larger diameter. Thus, the three protrusions 12 can always contact the inner diameter of the female screw.
【0013】このように構成された緩み止めねじ1を図
1に示すように、被締結物20としてのナットにねじ込
むと、ナットの雌ねじ穴21はその呼び寸法に応じた内
径を有し、谷径は通常、これに対応するねじ1の雄ねじ
が螺入可能な寸法に設定されているため、この緩み止め
ねじ1の谷部11の突部12が雌ねじ穴の内径に接触す
る。この時、図6に示すように、雄ねじの谷部11の突
部12と突部12との間の谷面13は雌ねじの内径との
間に隙間が生じているため、この谷面13は接触するこ
とがない。これにより、この緩み止めねじ1は雌ねじと
の間で突部12による所定の抵抗を生じながら所定トル
クでねじ込まれることになる。As shown in FIG. 1, when the loosening set screw 1 constructed as described above is screwed into a nut serving as the object 20 to be fastened, the female screw hole 21 of the nut has an inner diameter corresponding to its nominal size. Usually, the diameter is set to a size that allows the corresponding male screw of the screw 1 to be screwed in. Therefore, the projection 12 of the valley 11 of the locking screw 1 comes into contact with the inner diameter of the female screw hole. At this time, as shown in FIG. 6, a gap is formed between the protrusion 12 of the male screw valley 11 and the inner diameter of the female screw. No contact. As a result, the locking screw 1 is screwed with a predetermined torque while generating a predetermined resistance by the protrusion 12 with the female screw.
【0014】このようにねじ込まれて固定されると、雌
ねじのねじ山はある程度、その内径が復元するので、雄
ねじの谷部11に形成されている突部12は雌ねじのね
じ山内径に食い込むことになり、緩みが生じない。この
作用は雌ねじ穴21の内径が所定公差の範囲で規定され
ているので、緩み止めねじ1の谷部11の突部12に雌
ねじ穴21の内径が全く接しないという現象は生じず、
確実な緩み止め作用が得られることになる。When screwed and fixed in this way, the internal diameter of the internal thread is restored to some extent, so that the projection 12 formed in the root 11 of the external thread bites into the internal diameter of the internal thread. And no loosening occurs. In this operation, since the inner diameter of the female screw hole 21 is defined within a predetermined tolerance range, the phenomenon that the inner diameter of the female screw hole 21 does not contact the protrusion 12 of the valley 11 of the locking screw 1 at all does not occur.
As a result, a reliable locking action can be obtained.
【0015】一方、被締結物20の雌ねじ穴21の谷部
22は図4(及び図7の一点鎖線Aを参照)に示すよう
に、その谷径が雄ねじの突山部14の外径より大きいと
接触しないが、前記雄ねじの谷部11の突部12と雌ね
じ穴21の内径とが接触しているので、緩み止め作用に
何らの支障もない。また、図5(及び図7の一点鎖線B
を参照)のように、被締結物20の雌ねじ穴21の谷部
22の谷径が雄ねじに形成されているねじ山10の突山
部14の外径より小さいと、ねじ山10の突山部14は
雌ねじの谷部22に僅かでも食い込むことになり、この
ようなねじ込み作用においては、前記緩み止め作用とと
もにねじ山10の突山部12と雌ねじの谷部22との間
に生じる緩み止め作用の両者が生じることになり、より
大きな緩み止め作用が得られる。On the other hand, as shown in FIG. 4 (and the dashed line A in FIG. 7), the valley 22 of the female screw hole 21 of the workpiece 20 has a valley diameter smaller than the outer diameter of the ridge 14 of the male screw. If it is large, it does not come into contact, but since the protrusion 12 of the root 11 of the male screw and the inner diameter of the female screw hole 21 are in contact, there is no hindrance to the loosening prevention action. 5 (and the dashed line B in FIG. 7)
If the root diameter of the root part 22 of the female screw hole 21 of the workpiece 20 is smaller than the outer diameter of the root part 14 of the screw thread 10 formed in the male screw as shown in FIG. The portion 14 bites into the female thread valley 22 even slightly, and in such a screwing action, the locking action which occurs between the protrusion 12 of the screw thread 10 and the female thread valley 22 together with the locking action is provided. Both effects will occur and a greater locking effect will be obtained.
【0016】次に、呼び径2mmの従来の緩み止めねじ
とこの実施の形態における同一呼び径の緩み止めねじと
を夫々適合する被締結物20としてのナットにねじ込
み、これを緩めた場合の緩み止めトルクの測定を5回繰
り返し、その結果と夫々の平均値を表1に示す。Next, the conventional locking screw having a nominal diameter of 2 mm and the locking screw having the same nominal diameter in the present embodiment are screwed into nuts as the fittings 20 to be fitted, respectively. The measurement of the stop torque was repeated five times, and the results and average values of the respective results are shown in Table 1.
【0017】[0017]
【表1】 [Table 1]
【0018】この表1に示すように、従来の緩み止めね
じの平均が0.127N・mであって、もう一つの従
来の緩み止めねじの平均が0.040N・mであるの
に対し、本発明の緩み止めねじの平均は0.141N・
mであり、このように、本発明の緩み止めねじの緩み止
めトルクは従来のねじより高くなっている。As shown in Table 1, the average of the conventional conventional locking screw is 0.127 N · m and the average of the other conventional locking screw is 0.040 N · m. The average of the locking screw of the present invention is 0.141 N ·
m, thus, the locking torque of the locking screw of the present invention is higher than that of the conventional screw.
【0019】尚、この実施の形態では、ねじ山10の谷
部11に等間隔をおいて三ヶ所に曲率半径の小さい突部
12を形成した所謂、略三角断面形状の脚部3を形成し
ているが、これに限定されず、例えば、略四角、略五角
等の略多角形状であってもよい。In this embodiment, so-called leg portions 3 having a so-called substantially triangular cross-sectional shape are formed in which three protruding portions 12 having a small radius of curvature are formed at three positions at equal intervals in the root portion 11 of the screw thread 10. However, the present invention is not limited to this, and may be, for example, a substantially polygonal shape such as a substantially square or substantially pentagonal shape.
【0020】[0020]
【発明の効果】本発明は以上説明した実施の形態から明
らかなように、頭部2にドライバビットが係合する駆動
部を有し、ねじ込み力が与えられる脚部3に雄ねじを形
成したねじ1において、脚部3の断面形状を略三角形状
とし、この脚部3のねじ山10の略三角形状の谷部11
が回転することにより、谷部11にある突部12が描く
回転軌跡円直径を被締結物20の雌ねじ穴21の内径と
同径かあるいはこれよりも僅か大きく形成し、しかも、
前記雄ねじのねじ山頂角を雌ねじのねじ山とねじ山との
間の谷角より小さい構成とした緩み止めねじである。According to the present invention, as apparent from the above-described embodiments, a screw having a drive portion on a head 2 to which a driver bit is engaged, and a male screw formed on a leg 3 to which a screwing force is applied. 1, the cross-sectional shape of the leg 3 is substantially triangular, and the substantially triangular valley 11 of the thread 10 of the leg 3 is formed.
Rotates, the diameter of the rotation trajectory circle drawn by the protrusion 12 in the valley 11 is formed to be the same as or slightly larger than the inner diameter of the female screw hole 21 of the workpiece 20.
A locking screw in which the thread crest angle of the male screw is smaller than the root angle between the screw threads of the female screw.
【0021】このため、従来のように、脚部のねじ山に
弾発力を与えるために、スリットを形成したり、ねじ山
を形成する両側のフランク面を異なる角度で夫々形成し
て、このねじを雌ねじ穴にねじ込むようにしたものに比
べて異なった部分、即ち、緩み止め作用を生じる部分が
ねじの谷部と雌ねじの内径に位置するので、被締結物の
呼び寸法がねじの呼び寸法と同じであれば、緩み止め作
用は確実に得られる。また、雌ねじはその内径がJIS
で規定されているので、その信頼性が高く、JISに適
合した雌ねじであれば、ばらつきの少ない緩み止めトル
クが常時得られる。更に、雌ねじの内径は規定された許
容範囲内であることから、ねじ込み時におけるねじ込み
トルクが設定値より高くなってねじ浮き状態が発生した
り、反対に緩み止めトルクが不十分であったりする等の
課題も解消され、安定したねじ込み及び緩み止めトルク
が得られる。しかも、緩み止め効果を確実に得るために
被締結物の雌ねじ穴の谷径の寸法が一定のものをあらか
じめ選定して、この谷径に合う外径を有するねじを選定
する等の必要がなく、雄ねじと雌ねじ穴の呼び寸法が一
致すれば確実に所定の緩み止め作用が得られる。その
上、雄ねじの谷部が雌ねじの内径に接触するものである
から、ねじ込み時のトルクが低く設定でき、振動等によ
る緩め力は何ら変わらない。For this reason, in order to give a resilient force to the thread of the leg portion, a slit is formed or the flanks on both sides forming the thread are formed at different angles, respectively, as in the prior art. Since the different part, that is, the part that produces the locking action, is located at the root of the screw and the inner diameter of the female screw, the nominal size of the object to be fastened is smaller than the nominal size of the screw. If it is the same as above, the locking action can be obtained reliably. The inner diameter of the female screw is JIS
Therefore, if the female screw is highly reliable and conforms to JIS, a loosening prevention torque with little variation can always be obtained. Furthermore, since the internal diameter of the female screw is within the specified allowable range, the screwing torque at the time of screwing becomes higher than the set value, causing a screw floating state, or conversely, the loosening torque is insufficient. Is also solved, and stable screwing and loosening prevention torque can be obtained. In addition, there is no need to select a thread having a constant root diameter of the female screw hole of the object to be fastened in order to reliably obtain the locking effect, and to select a screw having an outer diameter matching the root diameter. If the nominal dimensions of the male screw and the female screw hole match, a predetermined loosening prevention action can be reliably obtained. In addition, since the root of the male screw is in contact with the inner diameter of the female screw, the torque at the time of screwing can be set low, and the loosening force due to vibration or the like does not change at all.
【0022】また、前記構成に加えて、谷部11の突部
12は脚部3の断面において、その円周上に等間隔を有
し、互いに隣り合う突部12と突部12との間に被締結
物20の雌ねじ穴21の内径に接触しない谷面13を有
しているので、雌ねじの内径には複数ヶ所が接触するだ
けとなって、このため、ねじ込み時のトルクの低減が確
実に図れるとともに、急激なトルク上昇もないので、自
動ねじ締め機等によるねじ締め作業の自動化に十分に対
応できる。更に、雄ねじと雌ねじ穴21との組み合わせ
によっては、脚部3のねじ山10の突山部14と雌ねじ
の谷部22とが接触することもあり、この場合は、更に
強固な緩み止め作用が得られる。その上、ねじの脚部3
のねじ山頂角は30°であるから、雄ねじのねじ山に形
成された突部が雌ねじの谷部に接触した場合に滑らかに
食い込むことができ、これによっても緩み止め作用がよ
り確実且つ強固になる等の特有の効果を有するものであ
る。Further, in addition to the above configuration, the projections 12 of the valleys 11 are equally spaced on the circumference of the cross section of the leg 3, and are located between the adjacent projections 12. Has a valley surface 13 which does not come into contact with the inner diameter of the female screw hole 21 of the work 20, so that only a plurality of locations contact the inner diameter of the female screw. In addition, since there is no sharp increase in torque, it is possible to sufficiently cope with the automation of the screw tightening operation by an automatic screw tightening machine or the like. Further, depending on the combination of the male screw and the female screw hole 21, the protrusion 14 of the thread 10 of the leg 3 may come into contact with the valley 22 of the female screw. In this case, a stronger loosening preventing action is provided. can get. Besides, the screw leg 3
Since the thread crest angle of the thread is 30 °, when the protrusion formed on the thread of the external thread comes into contact with the valley of the internal thread, it can bite smoothly. It has specific effects such as becoming.
【図1】本発明と被締結物の雌ねじ穴とのねじ込み状態
を示す拡大断面図である。FIG. 1 is an enlarged cross-sectional view illustrating a state where the present invention is screwed into a female screw hole of an object to be fastened.
【図2】本発明の実施の形態を示すねじの正面図であ
る。FIG. 2 is a front view of the screw showing the embodiment of the present invention.
【図3】図2の底面図である。FIG. 3 is a bottom view of FIG. 2;
【図4】本発明のねじ込み状態を示す要部拡大断面図で
ある。FIG. 4 is an enlarged sectional view of a main part showing a screwed state of the present invention.
【図5】本発明のもう一つのねじ込み状態を示す要部拡
大断面図である。FIG. 5 is an enlarged sectional view of a main part showing another screwed state of the present invention.
【図6】本発明のねじ込み状態を示す脚部の軸線に垂直
な拡大断面図である。FIG. 6 is an enlarged cross-sectional view perpendicular to the axis of the leg showing the screwed state of the present invention.
【図7】雄ねじの雌ねじへの作用状態を示す図6と同様
な拡大断面図である。FIG. 7 is an enlarged sectional view similar to FIG. 6, showing a state in which a male screw acts on a female screw.
【図8】従来例を示す要部断面正面図である。FIG. 8 is a sectional front view of a main part showing a conventional example.
【図9】もう一つの従来例を示す要部断面正面図であ
る。FIG. 9 is a cross-sectional front view of a main part showing another conventional example.
1 緩み止めねじ 2 頭部 3 脚部 4 駆動穴 10 ねじ山 11 谷部 12 突部 13 谷面 14 突山部 20 被締結物 21 雌ねじ穴 22 谷部 DESCRIPTION OF SYMBOLS 1 Loosening set screw 2 Head 3 Leg 4 Drive hole 10 Thread 11 Valley 12 Projection 13 Valley surface 14 Projection 20 Workpiece 21 Female screw hole 22 Valley
Claims (4)
駆動部を有し、駆動部に係合してねじ込み力が与えられ
る脚部(3)に雄ねじを形成したねじにおいて、 脚部の断面形状を略三角形状に形成し、この脚部に形成
された雄ねじの略三角形状の谷部(11)が回転するこ
とにより、谷部にある突部(12)が描く回転軌跡円直
径を被締結物(20)にあらかじめ形成されている雌ね
じ穴(21)の内径と同径かあるいはこれよりも僅か大
きく形成し、しかも、前記雄ねじのねじ山頂角を雌ねじ
を形成するねじ山とねじ山との間の谷角より小さい構成
としたことを特徴とする緩み止めねじ。1. A screw having a drive unit on a head (2) with which a driver bit is engaged, and a male screw formed on a leg (3) engaged with the drive unit to apply a screwing force. Is formed into a substantially triangular cross-section, and the substantially triangular valley (11) of the male screw formed on the leg is rotated, so that the rotation locus circle diameter drawn by the protrusion (12) in the valley is formed. Is formed to have the same diameter as or slightly larger than the inner diameter of the female screw hole (21) formed in advance in the workpiece (20), and the screw crest angle of the male screw is set to A locking screw having a configuration smaller than a valley angle between a mountain and a mountain.
に対して直交する断面において、その円周上に等間隔を
有して設けられていることを特徴とする請求項1記載の
緩み止めねじ。2. The projections formed in the valleys are provided at equal intervals on the circumference in a cross section orthogonal to the axis of the leg. The set screw described.
に被締結物の雌ねじ穴の内径に接触しない谷面(13)
を有していることを特徴とする請求項1又は2記載の緩
み止めねじ。3. A valley surface between the protrusions adjacent to each other and not in contact with an inner diameter of a female screw hole of an object to be fastened.
The locking screw according to claim 1, further comprising:
を特徴とする請求項1、2又は3記載の緩み止めねじ。4. The locking screw according to claim 1, wherein the external thread has a crest angle of 30 °.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001163907A JP2002349536A (en) | 2001-05-31 | 2001-05-31 | Locking screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001163907A JP2002349536A (en) | 2001-05-31 | 2001-05-31 | Locking screw |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2002349536A true JP2002349536A (en) | 2002-12-04 |
JP2002349536A5 JP2002349536A5 (en) | 2005-06-09 |
Family
ID=19006792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001163907A Pending JP2002349536A (en) | 2001-05-31 | 2001-05-31 | Locking screw |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2002349536A (en) |
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JP2008518125A (en) * | 2004-08-30 | 2008-05-29 | アキュメント インテレクチュアル プロパティーズ エルエルシー | Multi-lobe lock bolt |
JP2008518162A (en) * | 2004-08-30 | 2008-05-29 | アキュメント インテレクチュアル プロパティーズ エルエルシー | Multi-lobe type lock bolt and system |
JP2009115251A (en) * | 2007-11-08 | 2009-05-28 | Hamanaka Nut Kk | Bolt and nut |
JP2009228821A (en) * | 2008-03-24 | 2009-10-08 | Topura Co Ltd | Falling-off preventive screw |
WO2012073589A1 (en) * | 2010-11-30 | 2012-06-07 | 日東精工株式会社 | Locking screw |
CN103291727A (en) * | 2013-07-03 | 2013-09-11 | 许松林 | Anti-loosening cylindrical threaded part |
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JP2015086975A (en) * | 2013-10-31 | 2015-05-07 | 日東精工株式会社 | Tapping screw |
JP2016522374A (en) * | 2013-07-03 | 2016-07-28 | ▲許▼松林XU, Songlin | Locking cylindrical screw member |
JP2018076935A (en) * | 2016-11-10 | 2018-05-17 | 株式会社ユニオン精密 | Fastening member |
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2001
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KR101222733B1 (en) | 2004-08-30 | 2013-01-15 | 아큐먼트 인털렉추얼 프로퍼티즈 엘엘씨 | Multi-lobular lockbolt |
JP2008518162A (en) * | 2004-08-30 | 2008-05-29 | アキュメント インテレクチュアル プロパティーズ エルエルシー | Multi-lobe type lock bolt and system |
JP2008518125A (en) * | 2004-08-30 | 2008-05-29 | アキュメント インテレクチュアル プロパティーズ エルエルシー | Multi-lobe lock bolt |
KR101240079B1 (en) | 2004-08-30 | 2013-03-06 | 아큐먼트 인털렉추얼 프로퍼티즈 엘엘씨 | Multi-lobular lockbolt and system |
JP2009115251A (en) * | 2007-11-08 | 2009-05-28 | Hamanaka Nut Kk | Bolt and nut |
JP2009228821A (en) * | 2008-03-24 | 2009-10-08 | Topura Co Ltd | Falling-off preventive screw |
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