JP6231796B2 - Bolt / nut locking structure - Google Patents

Bolt / nut locking structure Download PDF

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JP6231796B2
JP6231796B2 JP2013145105A JP2013145105A JP6231796B2 JP 6231796 B2 JP6231796 B2 JP 6231796B2 JP 2013145105 A JP2013145105 A JP 2013145105A JP 2013145105 A JP2013145105 A JP 2013145105A JP 6231796 B2 JP6231796 B2 JP 6231796B2
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washer
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重信 濱中
重信 濱中
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濱中ナット株式会社
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Description

本発明はボルト・ナットの弛み止め構造に関し、特に相互に螺合させたボルト・ナットの締結が簡単に弛まないようにした構造に関する。   The present invention relates to a structure for preventing bolts and nuts from loosening, and more particularly, to a structure in which bolts and nuts screwed together are not easily loosened.

例えば、部材を締結する場合、部材に挿通穴を形成し、挿通穴にボルトを挿通し、ボルトの雄ねじにナットの雌ねじを螺合させ、ボルト・ナットを締めつけて締結する方式が一般的である。   For example, when fastening a member, a method is generally used in which an insertion hole is formed in the member, a bolt is inserted into the insertion hole, a female screw of a nut is screwed into a male screw of the bolt, and a bolt / nut is tightened. .

このボルト・ナットによる締結では振動、熱膨張、経年変化などの原因によって締結が弛むおそれがあることから、種々な弛み止め方式が提案されている。例えば、ナットの頂面又は座面のねじ穴周縁に弛み止め板を固定し、弛み止め板を弾性変形させてボルトのねじ山フランクに押しつけ、これによってナットに回転抵抗を付与するようにした弛み止め構造が知られている(特許文献1)。   Since fastening with this bolt / nut may cause loosening due to vibration, thermal expansion, secular change, and the like, various loosening prevention methods have been proposed. For example, a loosening prevention plate is fixed to the periphery of the screw hole on the top surface or seating surface of the nut, and the loosening prevention plate is elastically deformed and pressed against the thread flank of the bolt, thereby providing a rotational resistance to the nut. A stop structure is known (Patent Document 1).

また、先端側がナット中心に向けて偏向された円弧状のロック部をナットの頂面に一体的に形成する一方、ボルトの雄ねじに凹所を形成し、凹所にロック部の先端を嵌入させることによりナットの弛み方向への廻り止めを行う一方、ロック部が弾性変形してロック部の先端が凹所から抜け出させることによりナットの締付け方向への回転を許容するようにした弛み止め構造が提案されている(特許文献2)。   In addition, an arc-shaped lock portion whose tip side is deflected toward the center of the nut is integrally formed on the top surface of the nut, while a recess is formed in the male thread of the bolt, and the tip of the lock portion is inserted into the recess. This prevents the nut from rotating in the loosening direction, while the locking part is elastically deformed and the tip of the locking part is pulled out of the recess to allow the nut to rotate in the tightening direction. It has been proposed (Patent Document 2).

また、ボルト・ナットの座面及び座面が接触する座金の表面の各々に、ボルトの螺進方向への回動を許容する傾斜面と、ボルトの螺退方向の回転を阻止する段部とを有する複数の噛合部を円周方向に並べて形成し、ボルトの弛み止めを行うようにした技術が提案されている(特許文献3)。   In addition, each of the bearing surface of the bolt and nut and the surface of the washer with which the seat surface comes into contact, an inclined surface that allows the bolt to rotate in the screwing direction, and a step portion that prevents the bolt from rotating in the screwing direction. There has been proposed a technique in which a plurality of meshing portions having a shape are formed side by side in the circumferential direction to prevent bolts from loosening (Patent Document 3).

この特許文献3記載の弛み止めの技術は特許文献1、2の技術に比較して、部品点数が少なく、製造のコストアップを招来することが少ないという利点を有する。   The slack prevention technique described in Patent Document 3 has the advantage that the number of parts is small and the cost of manufacturing is less likely to occur than the techniques of Patent Documents 1 and 2.

特開2001−124043号公報Japanese Patent Laid-Open No. 2001-124043 特開2002−242921号公報Japanese Patent Laid-Open No. 2002-242921 実開昭52−13356号公報Japanese Utility Model Publication No. 52-13356

しかし、上記特許文献3記載の弛み止め構造では弛み止め性能が座金と被接合部材との摩擦に依存し、座金が被接合部材に対して回転してしまうと、ボルト・ナットの締結を簡単に緩めることができてしまう。   However, in the loosening prevention structure described in Patent Document 3, the loosening prevention performance depends on the friction between the washer and the member to be joined, and if the washer rotates with respect to the member to be joined, it is easy to fasten the bolt and nut. It can be loosened.

本発明はかかる問題点に鑑み、部品点数を増やすことなく、又製造のコストアップを招来することなく、弛み止めを確実に行うことができるようにしたボルト・ナットの弛み止め構造を提供することを課題とする。   SUMMARY OF THE INVENTION In view of such problems, the present invention provides a bolt / nut loosening prevention structure that can reliably prevent loosening without increasing the number of parts and without increasing the manufacturing cost. Is an issue.

そこで、本発明に係るボルト・ナットの弛み止め構造は、被接合部材の挿通穴にボルト軸部を挿通し、ボルト軸部にナットを螺合し、ナットと被接合部材との間に座金を介在させて締め付けるようにしたボルト・ナットの締結構造において、上記ナットの座面にはねじ穴を含む領域に凹所が形成され、該凹所の表面にはボルトの螺進方向への回転を許容する傾斜面及びボルトの螺退方向の回転を阻止する回転阻止部を有する複数の噛合部が上記ナット座面の円周方向に並べて形成され、上記座金の表面には嵌込み凹所が形成され、該嵌込み凹所には側面∠状をなす弾性変形可能な係止片部が嵌め込まれており、該係止片部は、上記ボルトの螺進方向への回転に対しては上記ナットの噛合部の傾斜面によって案内され弾性変形することによって、上記回転阻止部を乗り越えて上記ボルトの螺進方向への回転を許容し、上記ボルトの螺退方向の回転に対しては上記ナットの噛合部の回転阻止部と当接して上記ボルトの螺退方向への回転を阻止する一方、上記ボルト軸部には係止凹溝が軸線方向に延びて形成され、上記座金のボルト軸部挿通穴の内縁には上記係止凹溝に嵌入して上記座金をボルト軸部に対して廻り止めする係止突起が形成されていることを特徴とする。   Therefore, in the bolt / nut loosening prevention structure according to the present invention, the bolt shaft portion is inserted into the insertion hole of the member to be joined, the nut is screwed into the bolt shaft portion, and a washer is provided between the nut and the member to be joined. In the bolt and nut fastening structure that is interposed and tightened, a recess is formed in a region including a screw hole on the seat surface of the nut, and the surface of the recess is rotated in the screwing direction of the bolt. A plurality of meshing portions having an inclined surface to be allowed and a rotation preventing portion for preventing rotation of the bolt in a screwing direction are formed side by side in the circumferential direction of the nut seat surface, and a fitting recess is formed on the surface of the washer The fitting recess is fitted with an elastically deformable locking piece portion having a side hook shape, and the locking piece portion is configured to rotate the nut in the screwing direction. By being elastically deformed guided by the inclined surface of the meshing part The bolt is allowed to rotate in the screwing direction over the rotation blocking part, and the bolt is screwed in contact with the rotation blocking part of the meshing part of the nut against the rotation of the bolt in the screwing direction. On the other hand, the bolt shaft part is formed with a locking groove extending in the axial direction, and the bolt shaft part insertion hole of the washer is fitted into the locking groove to prevent the rotation in the direction. A locking projection for stopping the washer from rotating with respect to the bolt shaft portion is formed.

本発明の特徴の1つは座金表面の係止片部とナット座面の凹所の噛合部とによって、ボルトの螺進方向の回転を許容するがボルト螺退方向の回転を阻止する一方、ボルト軸部の係止凹溝と座金の係止突起とによって、座金をボルト軸部に対して廻り止めするようにした点にある。   One of the features of the present invention is that the locking piece portion of the washer surface and the engaging portion of the recess of the nut seat surface allow rotation of the bolt in the screwing direction but prevent rotation in the bolt screwing direction, This is in that the washer is prevented from rotating with respect to the bolt shaft portion by the locking concave groove of the bolt shaft portion and the locking projection of the washer.

これにより、ボルト又はナットは、ボルトの螺進方向には座金の係止片部がナット噛合部の傾斜面によって案内され弾性変形することによってナットの噛合部の回転阻止部を軽く越えて円滑に回転させることができるが、ボルトの螺退方向には座金の係止片部がナットの噛合部の回転阻止部に当接して回転を阻止され、ボルト・ナットを弛み止めすることができる。   As a result, the bolt or the nut smoothly moves slightly beyond the rotation prevention portion of the nut engagement portion by the elastically deforming the locking piece portion of the washer guided by the inclined surface of the nut engagement portion in the screwing direction of the bolt. Although the bolt can be rotated, the locking piece portion of the washer abuts against the rotation blocking portion of the meshing portion of the nut in the screwing direction of the bolt and is prevented from rotating, so that the bolt and nut can be prevented from loosening.

しかも、ボルト軸部の係止凹溝と座金の係止突起とによって座金をボルト軸部に対して廻り止めするようにしたので、弛み止め性能が座金と被接合部材との摩擦に依存することはなく、座金をボルト軸部に対して確実に廻り止めできる結果、ボルト・ナットを確実に弛み止めすることができる。   Moreover, since the washer is prevented from rotating with respect to the bolt shaft part by the locking groove of the bolt shaft part and the locking projection of the washer, the locking performance depends on the friction between the washer and the member to be joined. As a result, the washer can be reliably prevented from rotating with respect to the bolt shaft, so that the bolt and nut can be reliably prevented from loosening.

係止片部は座金の嵌込み凹所に嵌め込むようにしたので、ボルトの螺進方向への回転時に係止片部がナットの噛合部の傾斜面の頂上部分と干渉して過大な負荷が作用し、係止片部が損傷を受けるおそれがあるが、本発明ではナット座面に凹所を形成し、凹所表面に噛合部を形成するようにしているので、係止片部に過大な負荷が作用するおそれがない。   Since the locking piece is fitted into the fitting recess of the washer, the locking piece interferes with the top of the inclined surface of the meshing portion of the nut when the bolt rotates in the screwing direction, and an excessive load is applied. However, in the present invention, a recess is formed on the nut seat surface, and a meshing portion is formed on the surface of the recess. There is no risk of overload acting.

本発明のボルト・ナットの弛み止め構造の好ましい実施形態を示す断面図である。It is sectional drawing which shows preferable embodiment of the bolt / nut loosening prevention structure of this invention. 上記実施形態における座金表面(A)及びナット座面(B)の噛合部を示す図である。It is a figure which shows the meshing part of the washer surface (A) and nut seat surface (B) in the said embodiment. 上記実施形態における座金とナットの関係を示す側面図である。It is a side view which shows the relationship between a washer and a nut in the said embodiment.

以下、本発明を図面に示す具体例に基づいて詳細に説明する。図1ないし図3は本発明に係るボルト・ナットの弛み止め構造の好ましい実施形態を示す。図において、被接合部材14、15はボルト10、ナット11及び座金12、13によって締め付け接合されている。   Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 3 show a preferred embodiment of a bolt / nut locking structure according to the present invention. In the figure, the members to be joined 14 and 15 are fastened and joined by bolts 10, nuts 11 and washers 12 and 13.

ボルト10は頭部10Aと軸部10Bとからなり、軸部10Bには雄ねじが形成されてナット11が螺合されるようになっている。   The bolt 10 includes a head portion 10A and a shaft portion 10B, and a male screw is formed on the shaft portion 10B so that a nut 11 is screwed.

ナット11の座面にはねじ穴を含む領域に凹所11Dが形成され、凹所11Dの表面には複数の噛合部11Aが円周方向に並べて形成され、複数の各噛合部11Aはボルト10の螺進方向への回転を許容する傾斜面11B及びボルト10の螺退方向の回転を阻止する段部(回転阻止部)11Cから構成されている。   The seat surface of the nut 11 is formed with a recess 11D in a region including a screw hole, and a plurality of meshing portions 11A are formed in the circumferential direction on the surface of the recess 11D. An inclined surface 11B that allows rotation in the screwing direction and a step portion (rotation blocking portion) 11C that prevents rotation of the bolt 10 in the screwing direction.

他方、座金12は金属板を用いて平円板状に形成され、座金12の表面には嵌込み凹所12Bが形成され、嵌込み凹所12Dには側面∠状をなす弾性変形可能な係止片部12Aが嵌め込まれ、ボルト10の螺進方向への回転に対して係止片部12Aがナット11の噛合部11Aの傾斜面11Bによって案内され弾性変形することによって、ナット11の噛合部11Aの段部11Cを乗り越え、ボルト10の螺退方向への回転に対して係止片部12Aがナット11の噛合部11Aの段部11Cと当接するようになっている。   On the other hand, the washer 12 is formed into a flat disk shape using a metal plate, and a fitting recess 12B is formed on the surface of the washer 12, and the fitting recess 12D is an elastically deformable engagement having a side hook shape. The engaging portion of the nut 11 is fitted by the engaging piece 12A being fitted and elastically deformed by being guided by the inclined surface 11B of the engaging portion 11A of the nut 11 with respect to the rotation of the bolt 10 in the screwing direction. The locking piece 12A is brought into contact with the stepped portion 11C of the meshing portion 11A of the nut 11 with respect to the rotation of the bolt 10 in the screwing direction over the stepped portion 11C of 11A.

また、ボルト軸部10Bには一対の係止凹溝10Cが相互に180°の角度間隔をあけ、軸線方向に延びて形成され、座金12のボルト挿通穴の内縁には一対の係止突起12Cが相互に180°の角度間隔をあけて形成され、係止突起12Cが係止凹溝11Cに嵌まり込むことによって座金12がボルト軸部10Bに対して廻り止めされるようになっている。   In addition, a pair of locking grooves 10C are formed in the bolt shaft portion 10B so as to extend in the axial direction at an angular interval of 180 °, and a pair of locking protrusions 12C are formed on the inner edge of the bolt insertion hole of the washer 12. Are formed at an angular interval of 180 ° from each other, and the washer 12 is prevented from rotating with respect to the bolt shaft portion 10B by fitting the locking projection 12C into the locking groove 11C.

被接合部材14、15を接合する場合、図1に示されるように、被接合部材14、15の挿通穴及び座金12、13にボルト10の軸部10Bを挿通してナット11に螺合させ、座金12の係止突起12Cをボルト軸部10Bの係止凹溝10Cに嵌まり込ませ、座金12をボルト軸部10Bに対して廻り止めする。   When joining the members 14 and 15 to be joined, as shown in FIG. 1, the shaft portion 10B of the bolt 10 is inserted into the insertion holes and the washers 12 and 13 of the members 14 and 15 and screwed into the nut 11. Then, the locking protrusion 12C of the washer 12 is fitted into the locking groove 10C of the bolt shaft portion 10B, and the washer 12 is prevented from rotating with respect to the bolt shaft portion 10B.

こうして準備ができると、ナット11を適当な工具で固定して、ボルト10を回転させて螺進させる。ナット11の座面周縁が座金12に接するようになると、座金12の係止片部12Aがナット11の噛合部11Aに接するようになる。   When the preparation is completed in this manner, the nut 11 is fixed with an appropriate tool, and the bolt 10 is rotated and screwed. When the periphery of the seat surface of the nut 11 comes into contact with the washer 12, the locking piece portion 12A of the washer 12 comes into contact with the meshing portion 11A of the nut 11.

すると、座金12の係止片部12Aはナット11の噛合部11Aの傾斜面12Bに摺接し案内され弾性変形することによって、噛合部11Aの段部11Cを乗り越えるので、ボルト軸部10Bがナット11に対して螺進してナット11を締め付け、座金12の下面とナット11の座面周縁とが密着する。   Then, the locking piece portion 12A of the washer 12 is slidably brought into contact with the inclined surface 12B of the engaging portion 11A of the nut 11 and is elastically deformed to overcome the step portion 11C of the engaging portion 11A. And the nut 11 is tightened, and the lower surface of the washer 12 and the periphery of the seat surface of the nut 11 are in close contact with each other.

この状態でボルト10又はナット11が締結の弛む方向に回転しようとすると、座金12の係止片部12Aがナット11の噛合部11Aの段部11Cと当接し、しかも座金12はボルト軸部10Bに対して廻り止めされているので、ボルト10・ナット11は締結の弛む方向に回転することはできず、確実に弛み止めされる。   When the bolt 10 or the nut 11 tries to rotate in the loosening direction in this state, the locking piece portion 12A of the washer 12 comes into contact with the step portion 11C of the engaging portion 11A of the nut 11, and the washer 12 is the bolt shaft portion 10B. Therefore, the bolt 10 and the nut 11 cannot be rotated in the direction in which the fastening is loosened, and are securely loosened.

以上のように、本例の弛み止め構造によれば、部品点数が増えることはなく、又ナット11座面に噛合部11Aを、座金12の表面に係止片部12Aを加工すればよく、製造のコストアップを招来することがなく、ボルト10・ナット11の締結が弛むのを確実に阻止することができる。   As described above, according to the loosening prevention structure of this example, the number of parts does not increase, and the engagement portion 11A may be processed on the seat surface of the nut 11 and the locking piece portion 12A on the surface of the washer 12. It is possible to reliably prevent loosening of the bolt 10 and the nut 11 without causing an increase in manufacturing cost.

10 ボルト
10A 頭部
10B 軸部
10C 係止凹溝
11 ナット
11A 噛合部
11B 傾斜面
11C 段部
11D 凹所
12 座金
12A 係止片部
12C 係止突起
14、15 被接合部材
DESCRIPTION OF SYMBOLS 10 Bolt 10A Head part 10B Shaft part 10C Locking groove 11 Nut 11A Engagement part 11B Inclined surface 11C Step part 11D Recess 12 Washer 12A Locking piece part 12C Locking protrusion 14, 15

Claims (1)

被接合部材の挿通穴にボルト軸部を挿通し、ボルト軸部にナットを螺合し、ナットと被接合部材との間に座金を介在させて締め付けるようにしたボルト・ナットの締結構造において、
上記ナット(11)はナット(11)座面周縁に座金(12)が接する部分を残して座面のねじ穴を含む領域に凹所(11D)を有し、該凹所(11D)の表面にはボルト(10)の螺進方向への回転を許容する傾斜面(11B)及びボルト(10)の螺退方向の回転を阻止する回転阻止部(11C)を有する複数の噛合部(11A)が上記ナット(11)座面の円周方向に並列され、上記座金(12)はナット座面に対面する表面に嵌込み凹所(12B)を有し、該嵌込み凹所(12B)には平面矩形状で側面∠状をなす弾性変形可能な板ばね製の係止片部(12A)が嵌め込まれており、
該係止片部(12A)は、上記ボルト(10)の螺進方向への回転に対しては上記ナット(11)の噛合部(11A)の傾斜面(11B)によって案内され弾性変形することによって上記回転阻止部(11C)を乗り越えて上記ボルト(10)の螺進方向への回転を許容し、上記ボルト(10)の螺退方向の回転に対しては上記ナット(11)の噛合部(11A)の回転阻止部(11C)と当接して上記ボルト(10)の螺退方向への回転を阻止するようになっており、上記凹所(12B)は上記ナット(11)座面周縁部分と上記座金(12)とが接し始めたときに上記係止片部(12A)の側面∠状の上端縁が上記ナット(11)の噛合部(11A)の傾斜面(11B)に接し得る深さを有し、
上記ボルト軸部(10B)には係止凹溝(10C)が軸線方向に延び、上記座金(12)ボルト軸部挿通穴の内縁に係止突起(12D)を有し、係止突起(12D)は上記係止凹溝(10C)に嵌入して上記座金(12)をボルト軸部(10B)に対して廻り止めするようになっていることを特徴とするボルト・ナットの弛み止め構造。
In the bolt and nut fastening structure in which the bolt shaft portion is inserted into the insertion hole of the member to be joined, the nut is screwed into the bolt shaft portion, and the washer is interposed between the nut and the member to be joined.
The nut (11) has a recess (11D) in a region including the screw holes in the seat surface, leaving a portion of the nut (11) washer seating surface rim (12) is in contact with the surface of the recess (11D) A plurality of meshing portions (11A) having an inclined surface (11B) that allows rotation of the bolt (10) in the screwing direction and a rotation blocking portion (11C) that prevents rotation of the bolt (10) in the screwing direction. Are arranged in parallel in the circumferential direction of the seat surface of the nut (11), and the washer (12) has a fitting recess (12B) on the surface facing the nut seat surface, and the fitting recess (12B) Is fitted with an elastically deformable leaf spring locking piece (12A) having a planar rectangular shape and a side hook shape,
The locking piece (12A) is elastically deformed by being guided by the inclined surface (11B) of the meshing portion (11A) of the nut (11) with respect to the rotation of the bolt (10) in the screwing direction. To allow the bolt (10) to rotate in the screwing direction over the rotation preventing part (11C), and to engage the nut (11) with respect to rotation of the bolt (10) in the screwing direction. (11A) is in contact with the rotation preventing portion (11C) to prevent the bolt (10) from rotating in the screwing direction, and the recess (12B) is the periphery of the nut (11) seat surface. When the portion and the washer (12) start to come into contact with each other, the upper side edge of the side face of the locking piece (12A) can come into contact with the inclined surface (11B) of the meshing part (11A) of the nut (11). Has a depth,
Extending locking groove (10C) is in the axial direction to the bolt shaft portion (10B), said washer (12) has a locking projection (12D) on the inner edge of the bolt shaft portion insertion hole, said locking projection (12D) is locking bolts and nuts, characterized in that is adapted to detent the washers (12) fitted to the locking groove (10C) bolt shank with respect to (10B) Construction.
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JP3059901U (en) * 1998-12-15 1999-07-13 株式会社 メタルワークス Fastener
JP2002031120A (en) * 1999-06-07 2002-01-31 Ueda Akemi Spring washer having projection, and screws having locking mechanism
KR101027753B1 (en) * 2008-12-09 2011-04-08 이상철 Combination Bolt-Nut Locks

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