JP6431376B2 - Bolt with locking function - Google Patents

Bolt with locking function Download PDF

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Publication number
JP6431376B2
JP6431376B2 JP2015001487A JP2015001487A JP6431376B2 JP 6431376 B2 JP6431376 B2 JP 6431376B2 JP 2015001487 A JP2015001487 A JP 2015001487A JP 2015001487 A JP2015001487 A JP 2015001487A JP 6431376 B2 JP6431376 B2 JP 6431376B2
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screw shaft
screw
bolt
shaft
screwed
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JP2016125621A (en
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克彦 若林
克彦 若林
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HARDLOCK INDUSTRY CO., LTD.
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HARDLOCK INDUSTRY CO., LTD.
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Priority to JP2015001487A priority Critical patent/JP6431376B2/en
Priority to PCT/JP2016/050238 priority patent/WO2016111313A1/en
Publication of JP2016125621A publication Critical patent/JP2016125621A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/284—Locking by means of elastic deformation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Connection Of Plates (AREA)

Description

本発明は、緩み止め機能を有するボルトに関する。   The present invention relates to a bolt having a locking function.

本願出願人は、従来より、緩み止め機能を有するボルトの開発を行っており、例えば、下記の特許文献１，２に開示している。   The applicant of the present application has conventionally developed a bolt having a locking function, which is disclosed, for example, in Patent Documents 1 and 2 below.

特開平１０−３７９３６号公報Japanese Patent Laid-Open No. 10-37936 特開２００４−３２４８２０号公報JP 2004-324820 A 特開２０１０−２０３４６３号公報JP 2010-203463 A

これらはいずれも、ボルトのネジ軸の軸心に対して偏心して嵌合する部位を設けることによりネジ軸をネジ孔に対して偏心させ、これによりネジ軸とネジ孔との間に水平方向の反力を生じさせて、いわゆる「くさび作用」によって大きな緩み止め機能を生じさせるものである。   In any of these cases, the screw shaft is decentered with respect to the screw hole by providing a portion that is eccentrically fitted to the screw shaft axis of the bolt, whereby the horizontal direction between the screw shaft and the screw hole is reduced. A reaction force is generated, and a large locking function is generated by a so-called “wedge action”.

本発明は、上記従来技術とは異なる方法により同等の緩み止め機能を有する新たなボルトを提供することを目的とする。   An object of the present invention is to provide a new bolt having an equivalent locking function by a method different from that of the above-described prior art.

本発明は、上記目的を達成するために、次の技術的手段を講じた。   In order to achieve the above object, the present invention takes the following technical means.

即ち、本発明の緩み止め機能を有するボルトは、ネジ孔に螺合するネジ軸を有し、該ネジ軸の前記ネジ孔に螺合する範囲内の軸方向中途部にネジ軸のオネジ谷径よりも小径のくびれ部が設けられ、該くびれ部よりも軸方向先端側のネジ軸先端部の軸心が、くびれ部よりも軸方向基端側のネジ軸基端部の軸心に対して僅かに傾斜されており、これによりネジ軸先端部及びネジ軸基端部を前記ネジ孔に螺合したときネジ軸基端部に対するネジ軸先端部の傾斜角が小さくなるようにネジ軸先端部がネジ軸基端部に対して弾性変形することを特徴とするものである。   That is, the bolt having the locking function of the present invention has a screw shaft that is screwed into the screw hole, and the screw thread diameter of the screw shaft is in the middle of the screw shaft within the range screwed into the screw hole. A constricted portion having a smaller diameter than the constricted portion, and the axial center of the screw shaft distal end side closer to the axial direction than the constricted portion is in relation to the axial center of the screw shaft proximal end portion axially proximal to the constricted portion. The tip of the screw shaft is slightly inclined so that the angle of inclination of the tip of the screw shaft with respect to the base of the screw shaft becomes small when the screw shaft tip and the screw shaft base are screwed into the screw hole. Is elastically deformed with respect to the screw shaft base end portion.

本発明によれば、ネジ軸先端部がネジ軸基端部に対して弾性変形した状態でネジ軸がネジ孔に螺合され、その復元力が内部応力としてネジ軸に蓄積されるとともに、ネジ軸先端部はその傾斜方向側の側部がネジ孔内面に水平方向に強く圧接される一方、その反対側の側部でネジ軸基端部がネジ孔内面に水平方向に強く圧接され、これにより圧接各部での摩擦力を増大させて大きな緩み止め作用を生じさせることができる。さらに、くびれ部を設けておくことにより上記弾性変形を生じさせるための力が適切となるように容易に設計でき、ネジ軸先端部のみをネジ孔に螺合させた状態からインパクトレンチなどの適宜の工具を用いてボルトを所定の締め付け力で回転させることにより、ボルトを所定位置まで容易かつ迅速に締結することができるとともに、ネジ軸基端部のオネジがネジ孔のメネジに係合していくときにくびれ部が案内部として機能して、円滑にネジ軸基端部もネジ孔に螺着させることができる。   According to the present invention, the screw shaft is screwed into the screw hole in a state where the tip end portion of the screw shaft is elastically deformed with respect to the screw shaft base end portion, and the restoring force is accumulated in the screw shaft as internal stress. The side of the tip end of the shaft is strongly pressed against the inner surface of the screw hole in the horizontal direction, while the base end of the screw shaft is strongly pressed against the inner surface of the screw hole in the horizontal direction on the opposite side. As a result, the frictional force at each part of the press contact can be increased to produce a large locking action. Further, by providing a constricted portion, it can be easily designed so that the force for causing the elastic deformation is appropriate, and from the state where only the screw shaft tip portion is screwed into the screw hole, an impact wrench or the like can be appropriately used. By rotating the bolt with a predetermined tightening force using this tool, the bolt can be easily and quickly fastened to a predetermined position, and the male screw at the base end of the screw shaft is engaged with the female screw in the screw hole. The constricted portion functions as a guide portion at any time, and the screw shaft base end portion can be smoothly screwed into the screw hole.

本発明の一実施形態に係るボルトをネジ孔に螺着した状態を示す断面図である。It is sectional drawing which shows the state which screwed the volt | bolt which concerns on one Embodiment of this invention to the screw hole. 同ボルトの全体正面図である。It is the whole bolt front view. 同ボルトを製造するための中間製造物の正面図である。It is a front view of the intermediate product for manufacturing the bolt. 同ボルトのネジ軸先端部を変形させる曲げ加工工程を示す工程図であって、（ａ）は正面図、（ｂ）は左側面図である。It is process drawing which shows the bending process process which deform | transforms the screw shaft front-end | tip part of the same volt | bolt, Comprising: (a) is a front view, (b) is a left view. 別の実施形態に係るボルトの正面図である。It is a front view of the bolt concerning another embodiment.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１及び図２は本発明の一実施形態に係るボルト１を用いてベース部材Ａに対して被締結部材Ｂを締結した状態を示しており、ボルト１は、ボルト頭２と、外周にオネジが形成されたネジ軸３とを一体に備えている。このボルト１は、ステンレス鋼などの所要の弾性係数を有する従来公知の適宜の材料から製作できるが、好ましくは炭素鋼やモリブデン鋼などを用いることができる。。ベース部材Ａにはネジ軸３が螺合するネジ孔４が設けられており、被締結部材Ｂにはネジ軸３が遊嵌状に挿通されるボルト挿通孔５が設けられている。ネジ軸３のオネジ山径はネジ孔４のメネジ谷径より僅かに小さく、ネジ軸３のオネジ谷径はネジ孔４のメネジ山径より僅かに小さく、ネジ軸３とネジ孔４との間には僅かなハメアイ隙間が設けられている。   1 and 2 show a state in which a fastened member B is fastened to a base member A using a bolt 1 according to an embodiment of the present invention. The bolt 1 has a bolt head 2 and a male screw on the outer periphery. And a screw shaft 3 on which are formed. The bolt 1 can be manufactured from a conventionally known appropriate material having a required elastic modulus such as stainless steel, but preferably carbon steel or molybdenum steel can be used. . The base member A is provided with a screw hole 4 into which the screw shaft 3 is screwed, and the fastened member B is provided with a bolt insertion hole 5 through which the screw shaft 3 is inserted freely. The male thread diameter of the screw shaft 3 is slightly smaller than the female thread valley diameter of the screw hole 4, and the male thread valley diameter of the screw shaft 3 is slightly smaller than the female thread diameter of the screw hole 4, and between the screw shaft 3 and the screw hole 4. There is a slight gap between the eyes.

ボルト１のネジ軸３の軸方向中途部には、ボルト締結完了時にネジ孔４に螺合する範囲内にくびれ部６が設けられている。本実施形態のくびれ部６は、全周にわたって連続する断面半円弧状の溝からなり、このくびれ部６の最小径は、ネジ軸３のオネジ谷径よりも小さい。また、くびれ部６の軸方向長さ（特に、オネジの外表面よりも径方向内方に凹む部位の軸方向全長）は、ネジ軸３のオネジの２ピッチよりも大きくなされている。   A constricted portion 6 is provided in the middle of the axial direction of the screw shaft 3 of the bolt 1 within a range where the screw shaft 4 is screwed when the bolt fastening is completed. The constricted portion 6 of the present embodiment is formed of a groove having a semicircular cross section that is continuous over the entire circumference, and the minimum diameter of the constricted portion 6 is smaller than the diameter of the male thread valley of the screw shaft 3. Further, the axial length of the constricted portion 6 (particularly, the total axial length of the portion recessed radially inward from the outer surface of the male screw) is larger than two pitches of the male screw of the screw shaft 3.

そして、くびれ部６よりも先端側のネジ軸先端部３ａの軸心は、オネジ加工後にネジ軸基端部３ｂに対して押圧変形させることによってネジ軸基端部３ｂの軸心に対して僅かに傾斜されている。この傾斜角度θは、ネジ軸先端部３ａ及びネジ軸基端部３ｂをネジ孔４に螺合させたときにネジ軸基端部３ｂに対するネジ軸先端部３ａの傾斜角が小さくなるようにネジ軸先端部３ａのネジ軸基端部３ｂに対する弾性変形が生じる程度の大きさとなされている。具体的には、上記傾斜角θは、好ましくは１〜５度、より好ましくは２〜３度程度とすることができる。   The shaft center of the screw shaft tip 3a on the tip side of the constricted portion 6 is slightly deformed with respect to the shaft center of the screw shaft base end 3b by pressing and deforming the screw shaft base end 3b after male screw processing. It is inclined to. The inclination angle θ is set so that the inclination angle of the screw shaft distal end portion 3a with respect to the screw shaft proximal end portion 3b becomes smaller when the screw shaft distal end portion 3a and the screw shaft proximal end portion 3b are screwed into the screw hole 4. The size is such that elastic deformation of the shaft tip portion 3a with respect to the screw shaft base end portion 3b occurs. Specifically, the inclination angle θ is preferably 1 to 5 degrees, more preferably about 2 to 3 degrees.

上記くびれ部６は、ネジ軸先端部３ａの上記傾斜角θが小さくなるようネジ軸３が弾性変形することを可能とし、ボルト１の繰り返しの着脱によっても緩み止め機能を維持することに役立つ。   The constricted portion 6 enables the screw shaft 3 to be elastically deformed so that the inclination angle θ of the screw shaft tip portion 3a becomes small, and helps to maintain the function of preventing loosening even when the bolt 1 is repeatedly attached and detached.

上記ボルト１は適宜の製造方法によって製造することができるが、例えば、まず図３に示すように、オネジ加工前の軸部３’とボルト頭２とを有する中間製造物の軸部３’にくびれ部６を転造等の適宜の方法により設けておき、この中間製造物の軸部３’のくびれ部６の前後にわたってオネジを転造ダイス等によって形成することができる。   The bolt 1 can be manufactured by an appropriate manufacturing method. For example, as shown in FIG. 3, first, as shown in FIG. 3, an intermediate product shaft portion 3 ′ having a shaft portion 3 ′ and a bolt head 2 before male screw processing is provided. The constricted portion 6 is provided by an appropriate method such as rolling, and a male screw can be formed by a rolling die or the like over the constricted portion 6 of the shaft portion 3 ′ of the intermediate product.

また、オネジ形成後のネジ軸先端部３ａの変形加工（ネジ軸３の曲げ加工）は、例えば、図４に示すように、ネジ軸３の中央部にスペースを空けてネジ軸３の両端部を下方から台座７ａ，７ｂによって支持した状態で、くびれ部６よりも基端側で且つネジ軸３の中央部を上方から所定の力でプレスすることにより行うことができる。なお、プレス時にオネジが潰れてしまうことを防止するために、オネジに接触する台座７ａ及びプレス型８の接触面に、オネジのネジ山に適合するネジ山を形成しておくことが好ましい。   Further, the deformation processing (bending processing of the screw shaft 3) of the screw shaft tip portion 3a after the male screw is formed, for example, as shown in FIG. Can be carried out by pressing the central part of the screw shaft 3 from above with a predetermined force with the base 7a, 7b being supported from below. In order to prevent the male screw from being crushed at the time of pressing, it is preferable to form a screw thread that matches the screw thread of the male screw on the contact surface of the pedestal 7a that contacts the male screw and the press die 8.

本実施形態のボルト１によれば、ネジ孔４に螺着した際に、ネジ軸先端部３ａの軸心がネジ軸基端部３ｂの軸心に沿うように変形して、図１に示すように、僅かに傾斜されたネジ軸先端部３ａの傾斜方向の側部（図示左側側部）がネジ孔４内周面に強く圧接され、これによりネジ軸基端部３ｂがネジ孔４に対して僅かに偏心して反対側の側部（図示右側側部）がネジ孔４内周面に強く圧接される。より詳細には、傾斜方向の側部においては、ネジ軸基端部３ｂのオネジの上下フランク面がネジ孔４のメネジの上下フランク面から若干浮いた状態となる一方、反対方向の側部においては、ネジ軸基端部３ｂのオネジの上下フランク面が共にネジ孔４のメネジの上下フランク面に圧接されたような状態となり、これによりネジ軸３とネジ孔４との間に大きな摩擦力が生じて大きな緩み止め作用が生じる。   According to the bolt 1 of the present embodiment, when screwed into the screw hole 4, the shaft center of the screw shaft tip portion 3a is deformed so as to be along the shaft center of the screw shaft base end portion 3b, as shown in FIG. Thus, the side portion (left side portion in the drawing) of the slightly inclined tip end portion 3a of the screw shaft is strongly pressed against the inner peripheral surface of the screw hole 4, whereby the screw shaft base end portion 3b is brought into contact with the screw hole 4. On the other hand, it is slightly eccentric and the opposite side (the right side in the figure) is strongly pressed against the inner peripheral surface of the screw hole 4. More specifically, at the side portion in the inclined direction, the upper and lower flank surfaces of the male screw at the screw shaft base end portion 3b are slightly lifted from the upper and lower flank surfaces of the female screw at the screw hole 4, while at the side portion in the opposite direction. Is in a state in which the upper and lower flank surfaces of the male screw at the screw shaft base end portion 3 b are both pressed against the upper and lower flank surfaces of the female screw of the screw hole 4, thereby causing a large frictional force between the screw shaft 3 and the screw hole 4. Will occur and a large locking action will occur.

本発明は上記実施形態に限定されるものではなく適宜設計変更できる。例えば、くびれ部６は、図５に示すように円柱状の細長い軸部であってもよい。また、本発明のボルトは、ナットのネジ孔に対して螺着されるものであってもよい。   The present invention is not limited to the above-described embodiment, and can be appropriately changed in design. For example, the constricted portion 6 may be a cylindrical elongated shaft portion as shown in FIG. The bolt of the present invention may be screwed into the screw hole of the nut.

Claims (1)

ネジ孔に螺合するネジ軸を有し、該ネジ軸の前記ネジ孔に螺合する範囲内の軸方向中途部にネジ軸のオネジ谷径よりも小径のくびれ部が設けられ、該くびれ部よりも軸方向先端側のネジ軸先端部のオネジの軸心が、くびれ部よりも軸方向基端側のネジ軸基端部のオネジの軸心に対して僅かに傾斜されており、これによりネジ軸先端部及びネジ軸基端部を前記ネジ孔に螺合したときネジ軸基端部に対するネジ軸先端部の傾斜角が小さくなるようにネジ軸先端部がネジ軸基端部に対して弾性変形することを特徴とする緩み止め機能を有するボルト。 A constricted portion having a screw shaft that is screwed into the screw hole and having a diameter smaller than the male thread valley diameter of the screw shaft is provided in a midway portion in the axial direction within a range of being screwed into the screw hole of the screw shaft. The axial center of the male screw at the distal end of the screw shaft is slightly inclined with respect to the axial center of the male screw shaft at the proximal end in the axial direction from the constricted portion. When the screw shaft distal end and the screw shaft proximal end are screwed into the screw hole, the screw shaft distal end with respect to the screw shaft proximal end is reduced so that the inclination angle of the screw shaft distal end with respect to the screw shaft proximal end is reduced. A bolt having a locking function, which is elastically deformed.
JP2015001487A 2015-01-07 2015-01-07 Bolt with locking function Active JP6431376B2 (en)

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JP2015001487A JP6431376B2 (en) 2015-01-07 2015-01-07 Bolt with locking function
PCT/JP2016/050238 WO2016111313A1 (en) 2015-01-07 2016-01-06 Bolt with locking function

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KR102343225B1 (en) * 2018-08-09 2021-12-27 한온시스템 주식회사 Thermal cycle resistant fastening system for refrigerant fitting
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