JP3713413B2 - Detachment prevention device for screw parts - Google Patents

Detachment prevention device for screw parts Download PDF

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Publication number
JP3713413B2
JP3713413B2 JP2000060709A JP2000060709A JP3713413B2 JP 3713413 B2 JP3713413 B2 JP 3713413B2 JP 2000060709 A JP2000060709 A JP 2000060709A JP 2000060709 A JP2000060709 A JP 2000060709A JP 3713413 B2 JP3713413 B2 JP 3713413B2
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Japan
Prior art keywords
annular protrusion
side annular
screw
male screw
casing
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JP2000060709A
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Japanese (ja)
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JP2001248625A (en
Inventor
将義 桂
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Nippon Pillar Packing Co Ltd
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Nippon Pillar Packing Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、ねじ部品を締め付けると同時に抜け止めされるようにしたねじ部品の離脱防止装置に関する。
【０００２】
【従来の技術】
例えば、半導体製造装置の洗浄薬液の循環や移送などに使用される往復動ポンプにおいて、ポンプ内の管路に逆止弁を取り付ける場合、逆止弁のケーシングに雄ねじを設け、これをポンプ内の管路側に設けた雌ねじにねじ込むだけである、というねじ山どうしの摩擦力のみに依存した取付け方法が採用されている（例えば、特開平１０−１９６５２１号公報）。
【０００３】
【発明が解決しようとする課題】
しかるに、単にねじ込むだけのねじ部品たる上記逆止弁のケーシングではポンプの振動によりねじの緩みが発生しやすく、また、この種逆止弁のケーシングは耐薬品性に優れる樹脂で成形されているが、樹脂製のねじ部は熱サイクル等の外的要因によってクリープを起こして緩んでしまい、ついに逆止弁のケーシングが離脱、脱落してしまうおそれがあった。かと言って、そのゆるみ止めにナットなどを用いると締付け部材点数や締付け工程数の増大を招くといった難点がある。こうした問題は、上記逆止弁のケーシングの締付けの場合に限られず、その他の分野の各種ねじ部品の締付けにおいても同様のことが言える。
【０００４】
本発明の目的は、このような問題を解消するためになされたもので、ゆるみ止めナット等を用いないで、ねじの締め付けと同時に簡単にねじの抜け止めを図れるねじ部品の離脱防止装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明は、ねじ部品が、半導体製造装置における往復動ポンプのヘッド構成壁の管路側に設けた雌ねじにねじ込まれる逆止弁の円筒状の合成樹脂製ケーシングであって、前記ケーシングの外周に前記雌ねじにねじ込まれる雄ねじを設け、前記ケーシング内に弁体とこの弁体を弁座に対して押し付け付勢するばね部材とを内装してあり、前記雄ねじの先端部の外周面に、該雄ねじの谷径よりも小さい外径の雄ねじ側環状凸起を円周方向に設け、前記雌ねじの内奥部の内周面に、前記雄ねじ側環状凸起の外径よりも小さい内径の雌ねじ側環状凸起を円周方向に設け、前記雌雄ねじの締付け力により前記雄ねじ側環状凸起が前記雌ねじ側環状凸起を乗り越えて該雌ねじ側環状凸起の内奥側に係合するようにしてあり、前記雄ねじ側環状凸起の外径Ｄ1 と前記雌ねじ側環状凸起の内径Ｄ2 との寸法関係は、Ｄ1 ／Ｄ2 ＝１．０２〜１．１に設定しており、前記雄ねじ側環状凸起の断面形状は台形状に形成し、この台形状の雄ねじ側環状凸起の雄ねじ軸方向先端側の一辺を斜辺に形成するとともにこの斜辺と相対向する他辺も斜辺に形成し、前記雄ねじ側環状凸起の雄ねじ軸方向先端側の斜辺の傾斜角を４０°以下に設定し、ケーシングの先端面及びヘッド構成壁の内奥部端面がケーシング軸方向と垂直に形成され、前記雄ねじ側環状凸起が前記雌ねじ側環状凸起を乗り越えた状態で前記ケーシングの先端面と前記ヘッド構成壁の内奥部端面とを当接可能にしたことに特徴を有するものである。
【０００６】
【作用】
雄ねじ側環状凸起の外径は雄ねじの谷径よりも小さく設定しているので、雄ねじ側環状凸起を雌ねじ側のねじ山に当てることなく雄ねじを雌ねじにねじ込むことができる。
雌ねじ側環状凸起の内径は雄ねじ側環状凸起の外径よりも小さく設定し、雌雄ねじの締付け力により雄ねじ側環状凸起が雌ねじ側環状凸起を乗り越えて該雌ねじ側環状凸起の内奥側に係合するようにしてあるので、雌雄ねじを締め付けた後に雄ねじ側環状凸起と雌ねじ側環状凸起との係合状態が得られ、この係合作用により雌ねじと雄ねじが相対的に軸方向に抜け出るのを防止できる。したがって、たとえ熱サイクル等の外的要因によって雌雄ねじ間にゆるみが生じた場合も雌ねじ又は雄ねじを有するねじ部品が対象物から離脱、脱落するようなことが無くなる。
【０００７】
【発明の実施の形態】
本発明に係るねじ部品の離脱防止装置を半導体製造装置に使用される往復動ポンプに適用した場合の実施例について説明する。
【０００８】
図１において、往復動ポンプは、液体の流入路２及び流出路３を備えたポンプヘッド構成壁１の両側に固定連設された筒状のケーシング６Ａ，６Ｂ内にそれぞれ、同一方向に伸縮変形可能な一対のベローズ７，７を相対向状態に配設し、これら一対のベローズ７，７の開口周縁部７ａ，７ａを環状固定板８，８を介してポンプヘッド構成壁１に気密状に固定することによりケーシング６Ａ，６Ｂの内部空間を液室９ａ，９ａと空気室９ｂ，９ｂとに密封区画してなる一対のポンプ部４Ａ，４Ｂが構成されている。
【０００９】
そして、一対のポンプ部４Ａ，４Ｂにおける一対のベローズ７，７はポンプヘッド構成壁１を貫通して設けられた円周方向に複数本の連結ロッド５５を介して、一方のベローズ７が縮小動作するとき他方のベローズ７が伸長動作するように連動連結されている。また、一対のポンプ部４Ａ，４Ｂにおける液室９ａ，９ａにそれぞれ開口するようにポンプヘッド構成壁１に形成された吸入口１５、１５及び吐出口１６，１６はそれぞれ流入路２及び流出路３に連通されているとともに、これら各吸入口１５及び吐出口１６にはそれぞれ、吸入用逆止弁１７及び吐出用逆止弁１８が設けられている。さらに、ケーシング６Ａ，６Ｂの底壁部６ａ，６ｂには空気室９ｂ，９ｂに加圧空気を交互に供給する空気孔１９，１９が形成されている。
【００１０】
しかるときは、コンプレッサー等の加圧空気供給装置（図示省略）から送給される加圧空気を交互に空気孔１９，１９を通して空気室９ｂ，９ｂに供給することにより、一対のベローズ７，７を連結ロッド５５を介して可逆的に伸縮変形駆動させて一対のポンプ部４Ａ，４Ｂの吸入行程と吐出行程とを交互に行わせ、これによって流入路２から液室９ａ，９ａに流入される液体を流出路３へほぼ連続的に吐出させるといったポンプ作用が行われる。
【００１１】
本発明は、上記ねじ部品たる吸入用逆止弁１７や吐出用逆止弁１８をポンプヘッド構成壁１にねじ込み固定するのに適用される。
吸入用逆止弁１７は、耐薬品性に優れるＰＴＦＥ（ポリ四フッ化エチレン）、ＰＦＡ（パーフロロアルコキシ）等のフッ素樹脂で成形された円筒状のケーシング２０内に、弁体２１と、この弁体２１を弁座に押し付け付勢するばね部材２２とを内装している。そして、吸入用逆止弁１７は、図２に示すごとく、ケーシング２０の外周に雄ねじ２３を設ける一方、ポンプヘッド構成壁１に雌ねじ２４を設けてこの雌ねじ２４にケーシング２０の雄ねじ２３をねじ込むことにより取り付けられている。なお、図２ではケーシング２０内に組み込まれる弁体２１及びばね部材２２は図示するのを省略している。
【００１２】
図２及び図３に示すように、ケーシング２０において雄ねじ２３の先端部の外周面には、雄ねじ２３の谷径よりも小さい外径の雄ねじ側環状凸起２５を円周方向に設ける一方、ポンプヘッド構成壁１の雌ねじ２４の内奥部の内周面には、雄ねじ側環状凸起２５の外径よりも小さい内径の雌ねじ側環状凸起２６を円周方向に設けるとともに、該雌ねじ側環状凸起２６の内奥側に環状凹溝２７を円周方向に設けている。
【００１３】
雄ねじ側環状凸起２５の外径Ｄ1 と雌ねじ側環状凸起２６の内径Ｄ2 との寸法関係は、ポンプヘッド構成壁１の雌ねじ２４に対しケーシング２０の雄ねじ２３をねじ込むに最低限必要なねじ込み力だけで雄ねじ側環状凸起２５が雌ねじ側環状凸起２６を乗り越えられるような寸法に設定してある。具体的には、例えば、Ｄ1 ／Ｄ2 ＝１．０２〜１．１に設定している。この範囲が、後述する雄ねじ側環状凸起２５及び雌ねじ側環状凸起２６の断面形状と相俟ってねじ込み力により雄ねじ側環状凸起２５が雌ねじ側環状凸起２６を乗り越え易く、乗り越え後は抜け出るのを阻止できる係合力が必要かつ十分に得やすいからである。
【００１４】
雄ねじ側環状凸起２５及び雌ねじ側環状凸起２６の断面形状はそれぞれ、図２及び図３に示すごとく台形状に形成する。この場合、雄ねじ側環状凸起２５の雄ねじ軸方向先端側の斜辺２５ａの角度θ（図２中の拡大図参照）は４０゜以下、より好ましくは３０゜以下に設定する。角度θが４０゜を越えると、雄ねじ２３のねじ込み力により雌ねじ側環状凸起２６を乗り越えにくくなるからである。
【００１５】
このように構成された雄ねじ側環状凸起２５の外径は雄ねじ２３の谷径よりも小さく設定しているので、ケーシング２０の雄ねじ２３をポンプヘッド構成壁１の雌ねじ２４にねじ込む際、雄ねじ側環状凸起２５が雌ねじ２４のねじ山に突き当たるような不具合なく、円滑にねじ込むことができる。そして、ねじ込みにより雄ねじ側環状凸起２５が雌ねじ側環状凸起２６を乗り越えて該雌ねじ側環状凸起２６の内奥側の環状凹溝２７内に納まって、雄ねじ側環状凸起２５が雌ねじ側環状凸起２６の内奥側に抜け止め状に係合されるため、たとえ熱サイクル等の外的要因によって雌雄ねじ２４，２３間にゆるみが生じたとしてもケーシング２０がポンプヘッド構成壁１から離脱、脱落するのを防止できる。
【００１６】
上記ポンプヘッド構成壁１に対する吐出用逆止弁１８のねじ込みにおいても、吸入用逆止弁１７の上記ぬけ止め機構と同じ機構でもってポンプヘッド構成壁１の雌ねじ２４に抜け止め状にねじ込み結合される。
【００１７】
【発明の効果】
本発明によれば、ゆるみ止めナット等を用いないで、ねじの締め付けと同時に簡単にねじ部品の抜け止め状態を得ることができるという効果を奏する。
【図面の簡単な説明】
【図１】 往復動ポンプの全体縦断正面図である。
【図２】 ねじ部品の離脱防止装置部分の拡大断面図である。
【図３】 ねじ部品の離脱防止装置部分のねじ部品と対象物を分離して示す拡大断面図である。
【符号の説明】
１ ポンプヘッド構成壁（ねじ部品の螺入される対象物の一例）
２０ ケーシング（ねじ部品の一例）
２３ 雄ねじ
２４ 雌ねじ
２５ 雄ねじ側環状凸起
２６ 雌ねじ側環状凸起[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing a threaded part from being detached when the threaded part is tightened.
[0002]
[Prior art]
For example, in a reciprocating pump used for circulation or transfer of cleaning chemicals in semiconductor manufacturing equipment, when a check valve is attached to a pipe line in the pump, a male screw is provided in the check valve casing, An attachment method that depends only on the frictional force between the threads, which is simply screwed into a female screw provided on the pipe line side, is employed (for example, Japanese Patent Laid-Open No. 10-196521).
[0003]
[Problems to be solved by the invention]
However, the check valve casing, which is a screw part that is simply screwed in, is susceptible to screw loosening due to the vibration of the pump, and this type of check valve casing is molded from a resin with excellent chemical resistance. The screw portion made of resin may creep and loosen due to an external factor such as a heat cycle, and the check valve casing may eventually come off and fall off. However, if a nut or the like is used to prevent the loosening, there is a problem that the number of tightening members and the number of tightening processes are increased. Such a problem is not limited to the case of fastening the casing of the check valve, and the same can be said for fastening various screw parts in other fields.
[0004]
An object of the present invention is to solve such a problem, and provides a device for preventing the removal of a screw component that can easily prevent a screw from being removed simultaneously with tightening of a screw without using a locking nut or the like. There is to do.
[0005]
[Means for Solving the Problems]
The present invention is a cylindrical synthetic resin casing of a check valve screwed into a female screw provided on a pipe side of a head constituting wall of a reciprocating pump in a semiconductor manufacturing apparatus, A male screw to be screwed into the female screw is provided, and a valve body and a spring member that presses and biases the valve body against the valve seat are provided in the casing, and an outer peripheral surface of the male screw is provided on the outer peripheral surface of the male screw. An external thread-side annular protrusion having an outer diameter smaller than the root diameter is provided in the circumferential direction, and an internal thread-side annular protrusion having an inner diameter smaller than the outer diameter of the external thread-side annular protrusion is provided on the inner peripheral surface of the inner back portion of the internal thread. The male screw-side annular protrusion protrudes over the female screw-side annular protrusion by the tightening force of the female and male screw and engages with the inner side of the female screw-side annular protrusion. Outer diameter D1 of the male thread side annular projection And the internal diameter D2 of the female thread side annular protrusion is set to D1 / D2 = 1.02 to 1.1, and the cross section of the male thread side annular protrusion is formed in a trapezoidal shape. The one side of the male screw side annular protrusion of the trapezoidal male screw side annular protrusion is formed on the oblique side and the other side opposite to the oblique side is also formed on the oblique side. The tip end surface of the casing and the inner back end surface of the head constituting wall are formed perpendicular to the casing axial direction, and the male screw side annular protrusion has overcome the female screw side annular protrusion. In this state, the front end surface of the casing and the inner back end surface of the head constituting wall can be brought into contact with each other.
[0006]
[Action]
Since the outer diameter of the male thread side annular protrusion is set smaller than the valley diameter of the male screw, the male screw can be screwed into the female screw without applying the male thread side annular protrusion to the thread on the female screw side.
The inner diameter of the female thread side annular protrusion is set smaller than the outer diameter of the male thread side annular protrusion, and the male thread side annular protrusion overcomes the female thread side annular protrusion by the tightening force of the female male screw. Since the inner thread is engaged, the male thread side annular protrusion and the female thread side annular protrusion are obtained after tightening the female and male threads. It can be prevented from coming out in the axial direction. Therefore, even when looseness occurs between the female and male screws due to external factors such as a thermal cycle, the screw component having the female screw or the male screw is not detached from the object and dropped off.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the device for preventing the removal of screw parts according to the present invention is applied to a reciprocating pump used in a semiconductor manufacturing apparatus will be described.
[0008]
In FIG. 1, the reciprocating pump is expanded and contracted in the same direction in cylindrical casings 6A and 6B fixedly connected to both sides of a pump head constituting wall 1 having a liquid inflow path 2 and an outflow path 3, respectively. A pair of possible bellows 7, 7 are arranged in a mutually opposing state, and the opening peripheral edge portions 7 a, 7 a of the pair of bellows 7, 7 are hermetically sealed to the pump head constituting wall 1 via the annular fixing plates 8, 8. By fixing, a pair of pump parts 4A, 4B are formed, in which the internal space of the casings 6A, 6B is hermetically partitioned into liquid chambers 9a, 9a and air chambers 9b, 9b.
[0009]
The pair of bellows 7 and 7 in the pair of pump portions 4A and 4B is contracted by one bellows 7 through a plurality of connecting rods 55 in the circumferential direction provided through the pump head constituting wall 1. When this is done, the other bellows 7 is interlocked so as to extend. Further, the suction ports 15 and 15 and the discharge ports 16 and 16 formed in the pump head constituting wall 1 so as to open to the liquid chambers 9a and 9a in the pair of pump parts 4A and 4B are respectively an inflow path 2 and an outflow path 3. The suction port 15 and the discharge port 16 are respectively provided with a suction check valve 17 and a discharge check valve 18. Furthermore, air holes 19 and 19 for alternately supplying pressurized air to the air chambers 9b and 9b are formed in the bottom wall portions 6a and 6b of the casings 6A and 6B.
[0010]
In this case, a pair of bellows 7 and 7 are supplied by alternately supplying pressurized air supplied from a pressurized air supply device (not shown) such as a compressor to the air chambers 9b and 9b through the air holes 19 and 19. Are reversibly driven to expand and contract via the connecting rod 55, and the suction stroke and the discharge stroke of the pair of pump portions 4A and 4B are alternately performed, thereby flowing into the liquid chambers 9a and 9a from the inflow passage 2. A pumping action is performed such that the liquid is discharged almost continuously into the outflow passage 3.
[0011]
The present invention is applied for screwing and fixing the suction check valve 17 and the discharge check valve 18 which are the screw parts to the pump head constituting wall 1.
A check valve 17 for suction includes a valve body 21 and a valve body 21 in a cylindrical casing 20 formed of a fluororesin such as PTFE (polytetrafluoroethylene) and PFA (perfluoroalkoxy) having excellent chemical resistance. A spring member 22 that presses and urges the valve body 21 against the valve seat is housed. As shown in FIG. 2, the suction check valve 17 is provided with a male screw 23 on the outer periphery of the casing 20, while a female screw 24 is provided on the pump head constituting wall 1 and the male screw 23 of the casing 20 is screwed into the female screw 24. It is attached by. 2, illustration of the valve body 21 and the spring member 22 incorporated in the casing 20 is omitted.
[0012]
As shown in FIGS. 2 and 3, on the outer peripheral surface of the tip of the male screw 23 in the casing 20, a male screw side annular protrusion 25 having an outer diameter smaller than the root diameter of the male screw 23 is provided in the circumferential direction. A female screw side annular protrusion 26 having an inner diameter smaller than the outer diameter of the male screw side annular protrusion 25 is provided on the inner peripheral surface of the inner deep portion of the female screw 24 of the head constituting wall 1 in the circumferential direction. An annular groove 27 is provided in the circumferential direction on the inner back side of the protrusion 26.
[0013]
The dimensional relationship between the outer diameter D1 of the male thread side annular protrusion 25 and the inner diameter D2 of the female thread side annular protrusion 26 is the minimum screwing force required to screw the male thread 23 of the casing 20 into the female thread 24 of the pump head constituting wall 1. The dimension is set so that the male thread side annular protrusion 25 can overcome the female thread side annular protrusion 26. Specifically, for example, D1 / D2 is set to 1.02 to 1.1. This range, combined with the cross-sectional shapes of the male screw side annular projection 25 and the female screw side annular projection 26, which will be described later, makes it easy for the male screw side annular projection 25 to get over the female screw side annular projection 26 due to the screwing force. This is because it is necessary and sufficient to obtain an engagement force capable of preventing the escape.
[0014]
The cross-sectional shapes of the male thread side annular protrusion 25 and the female thread side annular protrusion 26 are each formed in a trapezoidal shape as shown in FIGS. In this case, the angle θ (see the enlarged view in FIG. 2) of the hypotenuse 25a on the front end side in the male screw axial direction of the male screw side annular protrusion 25 is set to 40 ° or less, more preferably 30 ° or less. This is because if the angle θ exceeds 40 °, it is difficult to get over the female thread side annular protrusion 26 due to the screwing force of the male thread 23.
[0015]
Since the outer diameter of the male screw side annular protrusion 25 configured in this way is set smaller than the valley diameter of the male screw 23, when the male screw 23 of the casing 20 is screwed into the female screw 24 of the pump head constituting wall 1, The annular protrusion 25 can be smoothly screwed in without any trouble such that it strikes against the thread of the female screw 24. Then, by screwing, the male screw side annular projection 25 gets over the female screw side annular projection 26 and fits into the annular groove 27 on the inner back side of the female screw side annular projection 26, and the male screw side annular projection 25 becomes the female screw side. Since the inner surface of the annular protrusion 26 is engaged in a retaining manner, the casing 20 can be separated from the pump head constituting wall 1 even if loosening occurs between the male and female screws 24 and 23 due to an external factor such as a thermal cycle. It is possible to prevent withdrawal and dropout.
[0016]
Also when the discharge check valve 18 is screwed into the pump head constituting wall 1, it is screwed and coupled to the female screw 24 of the pump head constituting wall 1 in a retaining manner by the same mechanism as the above-described stopper mechanism of the suction check valve 17. The
[0017]
【The invention's effect】
According to the present invention, there is an effect that it is possible to easily obtain a screw component retaining state simultaneously with screw tightening without using a locking nut or the like.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal front view of a reciprocating pump.
FIG. 2 is an enlarged cross-sectional view of a part for preventing separation of screw parts.
FIG. 3 is an enlarged cross-sectional view showing a screw part and an object separated from each other in a screw part detachment preventing device portion;
[Explanation of symbols]
1 Pump head component wall (an example of an object into which a screw part is screwed)
20 Casing (an example of screw parts)
23 Male thread 24 Female thread 25 Male thread side annular protrusion 26 Female thread side annular protrusion

Claims (1)

ねじ部品が、半導体製造装置における往復動ポンプのヘッド構成壁の管路側に設けた雌ねじにねじ込まれる逆止弁の円筒状の合成樹脂製ケーシングであって、
前記ケーシングの外周に前記雌ねじにねじ込まれる雄ねじを設け、前記ケーシング内に弁体とこの弁体を弁座に対して押し付け付勢するばね部材とを内装してあり、
前記雄ねじの先端部の外周面に、該雄ねじの谷径よりも小さい外径の雄ねじ側環状凸起を円周方向に設け、前記雌ねじの内奥部の内周面に、前記雄ねじ側環状凸起の外径よりも小さい内径の雌ねじ側環状凸起を円周方向に設け、前記雌雄ねじの締付け力により前記雄ねじ側環状凸起が前記雌ねじ側環状凸起を乗り越えて該雌ねじ側環状凸起の内奥側に係合するようにしてあり、
前記雄ねじ側環状凸起の外径Ｄ1 と前記雌ねじ側環状凸起の内径Ｄ2 との寸法関係は、Ｄ1 ／Ｄ2 ＝１．０２〜１．１に設定しており、
前記雄ねじ側環状凸起の断面形状は台形状に形成し、この台形状の雄ねじ側環状凸起の雄ねじ軸方向先端側の一辺を斜辺に形成するとともにこの斜辺と相対向する他辺も斜辺に形成し、
前記雄ねじ側環状凸起の雄ねじ軸方向先端側の斜辺の傾斜角を４０°以下に設定し、
ケーシングの先端面及びヘッド構成壁の内奥部端面がケーシング軸方向と垂直に形成され、前記雄ねじ側環状凸起が前記雌ねじ側環状凸起を乗り越えた状態で前記ケーシングの先端面と前記ヘッド構成壁の内奥部端面とを当接可能にしたことを特徴とするねじ部品の離脱防止装置。The screw component is a cylindrical synthetic resin casing of a check valve that is screwed into a female screw provided on the pipe side of the head constituting wall of the reciprocating pump in the semiconductor manufacturing apparatus,
A male screw to be screwed into the female screw is provided on the outer periphery of the casing, and a valve body and a spring member that presses and biases the valve body against the valve seat are provided in the casing.
A male screw side annular protrusion having an outer diameter smaller than the valley diameter of the male screw is provided in a circumferential direction on the outer peripheral surface of the front end portion of the male screw, and the male screw side annular protrusion is provided on the inner peripheral surface of the inner back portion of the female screw. An internal thread-side annular protrusion having an inner diameter smaller than the outside diameter of the protrusion is provided in the circumferential direction, and the external thread-side annular protrusion protrudes over the internal thread-side annular protrusion by the tightening force of the internal and external thread. It is designed to engage with the inner back side of
The dimensional relationship between the outer diameter D1 of the male thread side annular protrusion and the inner diameter D2 of the female thread side annular protrusion is set to D1 / D2 = 1.02 to 1.1,
The cross-sectional shape of the male screw-side annular protrusion is formed in a trapezoidal shape, and one side of the trapezoidal male screw-side annular protrusion on the front end side in the male screw axial direction is formed on the hypotenuse and the other side opposite to the hypotenuse is also formed on the hypotenuse. Forming ,
The inclination angle of the hypotenuse on the front end side of the male screw axial direction of the male screw side annular projection is set to 40 ° or less,
The front end surface of the casing and the head configuration in the state where the front end surface of the casing and the inner back end surface of the head constituting wall are formed perpendicular to the casing axial direction, and the male thread side annular protrusion overtakes the female thread side annular protrusion A device for preventing the removal of screw parts, wherein the inner end portion of the wall can be contacted .
JP2000060709A 2000-03-06 2000-03-06 Detachment prevention device for screw parts Expired - Lifetime JP3713413B2 (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107023556A (en) * 2017-04-27 2017-08-08 合肥晟泰克汽车电子股份有限公司 Nut and screw rod

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107023556A (en) * 2017-04-27 2017-08-08 合肥晟泰克汽车电子股份有限公司 Nut and screw rod

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