JP2019039494A

JP2019039494A - Fastening structure

Info

Publication number: JP2019039494A
Application number: JP2017161905A
Authority: JP
Inventors: 洋平松嶋; Yohei Matsushima; 祐一関; Yuichi Seki; 武史鳥居; Takeshi Torii
Original assignee: Aisin AW Co Ltd
Current assignee: Aisin AW Co Ltd
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2019-03-14

Abstract

To provide a fastening structure capable of reducing the number of members and an installation space.SOLUTION: A fastening structure includes an outside member 1 having a cylindrical inner peripheral surface 1A and formed with a female screw 5 on the inner peripheral surface 1A, and an inside member 2 having a cylindrical outer peripheral surface 2B and formed with a male screw 6 on the outer peripheral surface 2B. The female screw 5 is screwed with the male screw 6, and the outside member 1 has a through hole 18 penetrating the outside member 1 in a radial direction R. In the male screw 6, a melt-deformed portion 19 is formed at a portion facing an inner end 18A in the radial direction R of the through hole 18.SELECTED DRAWING: Figure 1

Description

本発明は、外側部材の雌ネジ部が内側部材の雄ネジ部に螺合している締結構造に関する。 The present invention relates to a fastening structure in which a female screw portion of an outer member is screwed to a male screw portion of an inner member.

このような締結構造として、例えば、特開２０１４−１１７９９０号公報（特許文献１）に記載されたものや、特開２００１−０２７２１７号公報（特許文献２）に記載されたものが知られている。 As such a fastening structure, for example, those described in Japanese Patent Application Laid-Open No. 2014-117990 (Patent Document 1) and those described in Japanese Patent Application Laid-Open No. 2001-027217 (Patent Document 2) are known. .

特許文献１の締結構造では、ナット９２〔外側部材〕の雌ネジ部をロータハブ５１〔内側部材〕の雄ネジ部に螺合させて、このナット９２によってボールベアリング９０が軸心方向に移動することを規制している。そして、ナット９２の雌ネジ部をロータハブ５１の雌ネジ部に螺合するときに、ナット９２とボールベアリング９０との間に円環板状の回り止め板部９２ａを介在させておき、ナット９２をボールベアリング９０に螺合させた後、回り止め板部９２ａの径方向の外側端部を、ナット９２側に屈曲させて当該外側端部をナット９２に係合させることで、ナット９２の回り止めを行っている。 In the fastening structure of Patent Document 1, the internal thread portion of the nut 92 [outer member] is screwed into the external thread portion of the rotor hub 51 [inner member], and the ball bearing 90 is moved in the axial direction by the nut 92. Is regulated. When the female threaded portion of the nut 92 is screwed into the female threaded portion of the rotor hub 51, an annular plate-shaped detent plate portion 92a is interposed between the nut 92 and the ball bearing 90. Are screwed into the ball bearing 90, and the outer end in the radial direction of the rotation-preventing plate 92a is bent toward the nut 92 and the outer end is engaged with the nut 92. Stopping.

特許文献２の締結構造では、ナット本体１５〔外側部材〕の雌ネジ部をボルト９〔内側部材〕の雄ネジ部に螺合させている。そして、ナット本体１５には、軸心方向に沿って縦溝１４が形成されている。縦溝１４は、ナット本体１５の内側に連通しており、縦溝１４にストッパーピン６，１６を打ち込み、このストッパーピン６，１６によってボルト９の雄ネジ部を変形させることで、ナット本体１５の回り止めを行っている。 In the fastening structure of Patent Document 2, the female screw portion of the nut body 15 [outer member] is screwed into the male screw portion of the bolt 9 [inner member]. The nut body 15 is formed with a longitudinal groove 14 along the axial direction. The vertical groove 14 communicates with the inside of the nut main body 15, and stopper pins 6 and 16 are driven into the vertical groove 14, and the male screw portion of the bolt 9 is deformed by the stopper pins 6 and 16, whereby the nut main body 15 The detent is done.

特開２０１４−１１７９９０号公報JP 2014-117990 A 特開２００１−０２７２１７号公報JP 2001-027217 A

特許文献１の締結構造では、外側部材の回り止めを行うために回り止め板部９２ａを用いており、部材点数が多くなっている。また、外側部材の雌ネジ部を内側部材の雄ネジ部に螺合させた後、回り止め板部９２ａを屈曲させる作業を行うため、回り止め板部９２ａの周囲に作業空間を確保しておくことが必要になる。
また、特許文献２の締結構造では、外側部材の回り止めを行うためにストッパーピン６，１６を用いており、部材点数が多くなっている。また、ストッパーピン６、１６を外側部材に打ち込んだ状態では、ストッパーピン６，１６が外側部材から突出しているため、外側部材の軸方向の一方側にストッパーピン６，１６の突出部が存在するための空間が必要となる。
このように、特許文献１や特許文献２の締結構造では、部材点数が多いと共に広い設置スペースが必要であった。 In the fastening structure of Patent Document 1, the rotation stopper plate 92a is used to prevent rotation of the outer member, and the number of members is increased. In addition, after the female screw portion of the outer member is screwed into the male screw portion of the inner member, the work for bending the anti-rotation plate portion 92a is performed, so that a working space is secured around the anti-rotation plate portion 92a. It will be necessary.
Moreover, in the fastening structure of patent document 2, in order to stop rotation of an outer member, the stopper pins 6 and 16 are used, and the number of members has increased. Further, when the stopper pins 6 and 16 are driven into the outer member, the stopper pins 6 and 16 protrude from the outer member, so that the protruding portions of the stopper pins 6 and 16 exist on one side in the axial direction of the outer member. Space is needed.
Thus, in the fastening structure of patent document 1 and patent document 2, a large installation space was required while there were many member points.

そこで、部材点数を少なく抑えることができると共に設置スペースを小さく抑えることができる締結構造の実現が望まれる。 Therefore, it is desired to realize a fastening structure that can reduce the number of members and reduce the installation space.

上記に鑑みた、締結構造の特徴構成は、円筒状の内周面を有すると共に前記内周面に雌ネジ部が形成された外側部材と、円筒状の外周面を有すると共に前記外周面に雄ネジ部が形成された内側部材と、を備え、前記雌ネジ部が前記雄ネジ部に螺合しており、前記外側部材は、当該外側部材を径方向に貫通する貫通孔部を備え、前記雄ネジ部及び前記雌ネジ部の少なくとも一方における、前記貫通孔部の前記径方向の内側端部に面する部分に、溶融変形部が形成されている点にある。 In view of the above, the fastening structure is characterized by an outer member having a cylindrical inner peripheral surface and a female screw portion formed on the inner peripheral surface, a cylindrical outer peripheral surface and a male outer surface. An inner member formed with a screw portion, the female screw portion is screwed into the male screw portion, and the outer member includes a through-hole portion that penetrates the outer member in the radial direction, In at least one of the male screw portion and the female screw portion, a melt-deformed portion is formed at a portion facing the radially inner end portion of the through-hole portion.

この特徴構成によれば、溶融変形部（１９）が形成された部分でネジ部が変形しているため、外側部材（１）の雌ネジ部（５）と内側部材（２）の雄ネジ部（６）とが相対的に回転することを規制できる。よって、外側部材（２）と内側部材（２）とが外れない締結構造を実現できる。そして、この締結構造では、外側部材（１）のと内側部材（２）とが外れることを規制するための部材を別途備える必要がないため、締結構造の部材点数を少なく抑えることができると共に締結構造の設置スペースを小さく抑えることができる。なお、溶融変形部（１９）は、例えば、外側部材（１）よりも径方向外側（Ｒ２）から、貫通孔部（１８）を利用して雄ネジ部（６）又は雌ネジ部（５）の一部を溶融させることで形成することができる。このように、本締結構造は、貫通孔部（１８）を備えることにより、比較的容易に溶融変形部（１９）を形成することが可能な構造となっている。 According to this characteristic configuration, since the screw portion is deformed at the portion where the melt-deformed portion (19) is formed, the female screw portion (5) of the outer member (1) and the male screw portion of the inner member (2). (6) and relative rotation can be restricted. Therefore, the fastening structure in which the outer member (2) and the inner member (2) do not come off can be realized. And in this fastening structure, since it is not necessary to separately provide a member for restricting that the outer member (1) and the inner member (2) come off, the number of members of the fastening structure can be reduced and fastening can be performed. The installation space for the structure can be kept small. The melt deformed portion (19) is formed, for example, from the radially outer side (R2) of the outer member (1) by using the through hole portion (18), the male screw portion (6) or the female screw portion (5). It can be formed by melting a part of. Thus, this fastening structure is a structure which can form a melt deformation part (19) comparatively easily by providing a through-hole part (18).

本実施形態の締結構造を示す図The figure which shows the fastening structure of this embodiment 本実施形態の締結構造において溶融している状態を示す図The figure which shows the state fuse | melted in the fastening structure of this embodiment 別の実施形態の締結構造を示す図The figure which shows the fastening structure of another embodiment

この締結構造の実施形態について図面に基づいて説明する。
この締結構造は、円筒状の内周面１Ａを有すると共に内周面１Ａに雌ネジ部５が形成された外側部材１と、円筒状の外周面２Ｂを有すると共に外周面２Ｂに雄ネジ部６が形成された内側部材２と、を備えている。本実施形態では、内側部材２を、車両用駆動装置を収容しているケース１１の突出部１２とし、外側部材１を、突出部１２に螺合されたナット１７としている。
以下、外側部材１や内側部材２の軸心が沿う方向を軸方向Ｌとし、軸方向Ｌにおける内側部材２に対して外側部材１を螺合させる方向を軸方向第一側Ｌ１とし、その反対方向に向かう側を軸方向第二側Ｌ２とする。 An embodiment of this fastening structure will be described with reference to the drawings.
The fastening structure includes an outer member 1 having a cylindrical inner peripheral surface 1A and having an internal thread portion 5 formed on the inner peripheral surface 1A, a cylindrical outer peripheral surface 2B, and a male screw portion 6 on the outer peripheral surface 2B. And an inner member 2 formed. In the present embodiment, the inner member 2 is the protruding portion 12 of the case 11 housing the vehicle drive device, and the outer member 1 is the nut 17 screwed to the protruding portion 12.
Hereinafter, the direction along which the axial centers of the outer member 1 and the inner member 2 follow is referred to as the axial direction L, and the direction in which the outer member 1 is screwed to the inner member 2 in the axial direction L is referred to as the axial first side L1. Let the side which goes to a direction be the axial direction 2nd side L2.

ケース１１は、径方向Ｒに延びる壁部１１Ａから軸方向第二側Ｌ２に突出する突出部１２を備えており、この突出部１２に対して径方向内側Ｒ１に軸部材１３が配置されている。
突出部１２は、外周面２Ｂに加えて円筒状の内周面２Ａを有する筒状に形成されている。突出部１２と軸部材１３との間にはニードルベアリング１４が介在しており、ケース１１は、軸部材１３を回転可能に支持している。このニードルベアリング１４は、突出部１２の内周面２Ａに接触している。従って、本実施形態では、ニードルベアリング１４が、内側部材２の内周面２Ａに接触している接触部材３に相当する。 The case 11 includes a protruding portion 12 that protrudes from the wall portion 11A extending in the radial direction R to the second axial side L2, and the shaft member 13 is disposed on the radially inner side R1 with respect to the protruding portion 12. .
The protrusion 12 is formed in a cylindrical shape having a cylindrical inner peripheral surface 2A in addition to the outer peripheral surface 2B. A needle bearing 14 is interposed between the protruding portion 12 and the shaft member 13, and the case 11 supports the shaft member 13 in a rotatable manner. The needle bearing 14 is in contact with the inner peripheral surface 2A of the protrusion 12. Therefore, in the present embodiment, the needle bearing 14 corresponds to the contact member 3 that is in contact with the inner peripheral surface 2 A of the inner member 2.

ケース１１の突出部１２の径方向外側Ｒ２には、支持部材１５が配置されている。この支持部材１５は、例えば、車両用駆動装置が有する回転電機のロータを支持する部材である。ケース１１の突出部１２と支持部材１５との間にはボールベアリング１６が介在しており、ケース１１は、支持部材１５を回転可能に支持している。 A support member 15 is disposed on the radially outer side R 2 of the protruding portion 12 of the case 11. For example, the support member 15 is a member that supports a rotor of a rotating electrical machine included in the vehicle drive device. A ball bearing 16 is interposed between the protruding portion 12 of the case 11 and the support member 15, and the case 11 supports the support member 15 rotatably.

ナット１７の雌ネジ部５は突出部１２の雄ネジ部６に螺合している。ナット１７は、突出部１２に対して軸方向第二側Ｌ２から螺合されており、ボールベアリング１６に対して軸方向第二側Ｌ２に設置されている。ボールベアリング１６は、軸方向Ｌにおいてケース１１とナット１７との間に設置されており、ナット１７とケース１１とにより軸方向Ｌに移動することが規制されている。 The female screw portion 5 of the nut 17 is screwed into the male screw portion 6 of the protruding portion 12. The nut 17 is screwed into the protruding portion 12 from the second axial side L2, and is installed on the second axial side L2 with respect to the ball bearing 16. The ball bearing 16 is installed between the case 11 and the nut 17 in the axial direction L, and movement of the ball bearing 16 in the axial direction L is restricted by the nut 17 and the case 11.

本実施形態では、ナット１７と突出部１２とは材質が異なっている。本実施形態では、ナット１７の材質は鋼であり、突出部１２の材質は、アルミニウム合金である。そのため、ナット１７と突出部１２とのうち、突出部１２が融点の低い方の部材となっている。 In the present embodiment, the material of the nut 17 and the protruding portion 12 are different. In this embodiment, the material of the nut 17 is steel, and the material of the protrusion 12 is an aluminum alloy. Therefore, of the nut 17 and the protruding portion 12, the protruding portion 12 is a member having a lower melting point.

ナット１７は、当該ナット１７の筒状の本体部１７Ａを径方向Ｒに貫通する貫通孔部１８を備えている。貫通孔部１８は、ナット１７の周方向に沿って均等な間隔で複数個所に形成されている。貫通孔部１８の間隔は、ナット１７に対する貫通孔部１８の大きさやナット１７の周囲の状況（レーザ溶接装置２１（図２参照）による溶接可能範囲等）に応じて適宜設定すればよい。貫通孔部１８は、例えば、周方向に沿って３０°間隔、４５°間隔、又は、６０°間隔等の間隔で均等に形成することが考えられる。 The nut 17 includes a through-hole portion 18 that penetrates the cylindrical main body portion 17 A of the nut 17 in the radial direction R. The through-hole portions 18 are formed at a plurality of locations at equal intervals along the circumferential direction of the nut 17. What is necessary is just to set the space | interval of the through-hole part 18 suitably according to the magnitude | size of the through-hole part 18 with respect to the nut 17, and the condition around the nut 17 (the welding possible range by the laser welding apparatus 21 (refer FIG. 2) etc.). For example, the through-hole portions 18 may be formed uniformly at intervals of 30 °, 45 °, 60 °, or the like along the circumferential direction.

本実施形態では、ナット１７の内周面１Ａにおける軸方向第一側Ｌ１の部分には雌ネジ部５が形成されているが、ナット１７の内周面１Ａにおける軸方向第二側Ｌ２の部分は雌ネジ部５が形成されていない円筒状内周面となっている。貫通孔部１８は、軸方向Ｌにおける雌ネジ部５が存在する領域に形成されている。具体的には、ナット１７における軸方向Ｌの中央位置より軸方向第二側Ｌ２の領域に形成されている。 In the present embodiment, the female screw portion 5 is formed on the portion of the inner peripheral surface 1A of the nut 17 on the first axial side L1, but the portion of the inner peripheral surface 1A of the nut 17 on the second axial side L2 is formed. Is a cylindrical inner peripheral surface in which the female screw part 5 is not formed. The through-hole portion 18 is formed in a region where the female screw portion 5 exists in the axial direction L. Specifically, the nut 17 is formed in a region on the second axial side L2 from the central position in the axial direction L.

雄ネジ部６及び雌ネジ部５の少なくとも一方における、貫通孔部１８の径方向内側Ｒ１の端部（内側端部１８Ａ）に面する部分に、溶融変形部１９が形成されている。本実施径形態では、溶融変形部１９は、ナット１７と突出部１２とのうちの融点の低い方の部材である突出部１２の方に溶融変形部１９が形成されている。ここで、溶融変形部１９は、雄ネジ部６及び雌ネジ部５の少なくとも一方を溶融変形させてネジとして正常に機能できない形状に変形させた部分を指す。そして、雄ネジ部６における、貫通孔部１８の内側端部１８Ａに面する部分には、雄ネジ部６における貫通孔部１８の内側端部１８Ａの開口に対向する部分及びその周辺部分が含まれ、より詳しくは、雌ネジ部５における、径方向視で貫通孔部１８の内側端部１８Ａの開口と重複する部分と、当該部分の周りを囲む周辺部分とが含まれる。一方、雌ネジ部５における、貫通孔部１８の内側端部１８Ａに面する部分には、貫通孔部１８の内側端部１８Ａの開口縁部分が含まれ、より詳しくは、貫通孔部１８の内部における内側端部１８Ａの周辺部分と、貫通孔部１８の外部の雌ネジ部５における内側端部１８Ａの周辺部分とが含まれる。図１に示す例では、溶融変形部１９は、雌ネジ部５における径方向視で貫通孔部１８の内側端部１８Ａの開口と重複する部分であって、貫通孔部１８の内側端部１８Ａの開口の縁部に沿う部分に形成されている。 In at least one of the male screw portion 6 and the female screw portion 5, a melt-deformed portion 19 is formed at a portion facing the end portion (inner end portion 18 A) on the radially inner side R 1 of the through-hole portion 18. In the present embodiment, the melt deformed portion 19 is formed on the projecting portion 12 which is a member having a lower melting point of the nut 17 and the projecting portion 12. Here, the melt-deformed portion 19 refers to a portion in which at least one of the male screw portion 6 and the female screw portion 5 is melt-deformed and deformed into a shape that cannot function normally as a screw. The portion facing the inner end portion 18A of the through hole portion 18 in the male screw portion 6 includes a portion facing the opening of the inner end portion 18A of the through hole portion 18 in the male screw portion 6 and its peripheral portion. More specifically, a portion of the female screw portion 5 that overlaps with the opening of the inner end portion 18A of the through-hole portion 18 in the radial direction and a peripheral portion surrounding the portion are included. On the other hand, the portion of the female screw portion 5 that faces the inner end portion 18A of the through-hole portion 18 includes an opening edge portion of the inner end portion 18A of the through-hole portion 18. A peripheral portion of the inner end portion 18A inside and a peripheral portion of the inner end portion 18A of the female screw portion 5 outside the through hole portion 18 are included. In the example shown in FIG. 1, the melt-deformed portion 19 is a portion overlapping the opening of the inner end portion 18 A of the through-hole portion 18 in the radial direction of the female screw portion 5, and the inner end portion 18 A of the through-hole portion 18. It is formed in a portion along the edge of the opening.

溶融変形部１９の形成について説明する。図２に示すように、溶融変形部１９は、例えば、レーザ溶接装置２１から投射したレーザ光２２を、雄ネジ部６及び雌ネジ部５の少なくとも一方における貫通孔部１８の内側端部１８Ａに面する部分に照射して、当該部分を溶融して形成する。このとき、レーザ溶接装置２１は、レーザ光２２が貫通孔部１８を径方向外側Ｒ２から径方向内側Ｒ１に通過するように照射する。 The formation of the melt deformation part 19 will be described. As shown in FIG. 2, for example, the melt deformation portion 19 applies the laser beam 22 projected from the laser welding device 21 to the inner end portion 18 A of the through hole portion 18 in at least one of the male screw portion 6 and the female screw portion 5. Irradiate the facing part to melt the part. At this time, the laser welding apparatus 21 irradiates the laser beam 22 so as to pass through the through-hole portion 18 from the radially outer side R2 to the radially inner side R1.

また、溶融変形部１９は、複数の貫通孔部１８のうちの１つを利用して形成されている。ここでは、レーザ溶接装置２１と複数の貫通孔部１８のそれぞれとの位置関係に基づいて、最も溶融変形部１９を形成し易い位置に存在する１つの貫通孔部１８を選択する。一般的に、レーザ溶接装置２１におけるレーザ照射口の位置及び角度は自由に変更できるわけではなく、ある程度の範囲内に制限されることが多い。従って、貫通孔部１８の数が少ないと、いずれの貫通孔部１８に対してもレーザ光を照射できない場合が生じ得る。そこで、本実施形態のように、貫通孔部１８をナット１７の周方向に沿って均等な間隔で複数個所に形成することにより、貫通孔部１８がレーザ光を照射できない位置になる可能性を低くすることができる。ここで、複数の貫通孔部１８を設ける間隔を、レーザ溶接装置２１におけるレーザ照射口の位置及び角度の変更可能範囲に応じて設定すると好適である。より具体的には、複数の貫通孔部１８を設ける角度間隔を、レーザ溶接装置２１におけるレーザ照射口の位置の変更可能な角度範囲以下に設定すると好適である。 The melt deformed portion 19 is formed using one of the plurality of through-hole portions 18. Here, based on the positional relationship between the laser welding device 21 and each of the plurality of through-hole portions 18, one through-hole portion 18 that exists at a position where the melt-deformed portion 19 is most easily formed is selected. Generally, the position and angle of the laser irradiation port in the laser welding apparatus 21 cannot be freely changed, and are often limited to a certain range. Therefore, if the number of through-hole portions 18 is small, there may occur a case where any through-hole portion 18 cannot be irradiated with laser light. Therefore, as in this embodiment, by forming the through holes 18 at a plurality of locations at equal intervals along the circumferential direction of the nut 17, there is a possibility that the through holes 18 cannot be irradiated with laser light. Can be lowered. Here, it is preferable to set the intervals at which the plurality of through-hole portions 18 are provided according to the changeable range of the position and angle of the laser irradiation port in the laser welding apparatus 21. More specifically, it is preferable that the angle interval at which the plurality of through-hole portions 18 are provided is set to be equal to or less than an angular range in which the position of the laser irradiation port in the laser welding apparatus 21 can be changed.

２．その他の実施形態
次に、締結構造のその他の実施形態について説明する。 2. Other Embodiments Next, other embodiments of the fastening structure will be described.

（１）上記実施形態では、雄ネジ部６における貫通孔部１８の内周縁部の近くにレーザ光２２を投射して溶融変形部１９を形成したが、図３に示すように、雄ネジ部６における径方向Ｒ視で貫通孔部１８の中央に位置する部分にレーザ光２２を投射して溶融変形部１９を形成してもよい。 (1) In the said embodiment, although the laser beam 22 was projected near the inner peripheral part of the through-hole part 18 in the external thread part 6, the melt deformation part 19 was formed, as shown in FIG. 6 may be formed by projecting the laser beam 22 onto a portion located in the center of the through hole 18 as viewed in the radial direction R in FIG.

（２）上記実施形態では、内側部材２を、内周面２Ａを有する筒状に形成したが、内側部材２を、内周面２Ａを有さない中実状に形成してもよい。また、内側部材２を、内周面２Ａを有する筒状に形成した場合において、内側部材２の内周面２Ａに接触部材３を接触させなくてもよい。 (2) In the above embodiment, the inner member 2 is formed in a cylindrical shape having the inner peripheral surface 2A, but the inner member 2 may be formed in a solid shape without the inner peripheral surface 2A. Further, when the inner member 2 is formed in a cylindrical shape having the inner peripheral surface 2 A, the contact member 3 may not be in contact with the inner peripheral surface 2 A of the inner member 2.

（３）上記実施形態では、貫通孔部１８を、外側部材１の周方向に沿って均等な間隔で複数箇所に形成したが、貫通孔部１８を、外側部材１の周方向に沿って１箇所にのみ形成してもよく、また、貫通孔部１８を、外側部材１の周方向に沿って複数箇所に形成する場合において、均等でない間隔で複数の貫通孔部１８を外側部材１に形成してもよい。 (3) In the above embodiment, the through-hole portions 18 are formed at a plurality of locations at equal intervals along the circumferential direction of the outer member 1, but the through-hole portions 18 are formed along the circumferential direction of the outer member 1. The through-hole portions 18 may be formed only at the locations, and when the through-hole portions 18 are formed at a plurality of locations along the circumferential direction of the outer member 1, the plurality of through-hole portions 18 are formed in the outer member 1 at unequal intervals. May be.

（４）上記実施形態では、外側部材１の材質を鋼とし、内側部材２をアルミニウム合金としたが、外側部材１の材質や内側部材２の材質は、ステンレスや真鍮等の別の材質に適宜変更してもよい。また、外側部材１と内側部材２とを同じ材質としてもよい。 (4) In the above embodiment, the material of the outer member 1 is steel and the inner member 2 is an aluminum alloy. However, the material of the outer member 1 and the material of the inner member 2 are appropriately selected from other materials such as stainless steel and brass. It may be changed. Further, the outer member 1 and the inner member 2 may be made of the same material.

（５）上記実施形態では、溶融変形部１９を、外側部材１と内側部材２とのうちで融点の低い方の部材に形成したが、溶融変形部１９を、外側部材１と内側部材２とのうちで融点の高い方の部材に形成してもよい。 (5) In the above embodiment, the melt deformed portion 19 is formed on the member having the lower melting point of the outer member 1 and the inner member 2, but the melt deformed portion 19 is formed on the outer member 1 and the inner member 2. Of these, it may be formed on a member having a higher melting point.

（６）上記実施形態では、内側部材２の雄ネジ部６と外側部材１の雌ネジ部５とのうちの内側部材２の雄ネジ部６にのみ溶融変形部１９を形成したが、内側部材２の雄ネジ部６と外側部材１の雌ネジ部５とのうち、外側部材１の雌ネジ部５にのみ溶融変形部１９を形成してもよく、また、内側部材２の雄ネジ部６と外側部材１の雌ネジ部５との双方に溶融変形部１９を形成してもよい。 (6) In the above embodiment, the melt deformed portion 19 is formed only on the male screw portion 6 of the inner member 2 out of the male screw portion 6 of the inner member 2 and the female screw portion 5 of the outer member 1. Among the two male screw portions 6 and the female screw portion 5 of the outer member 1, the melt deformable portion 19 may be formed only in the female screw portion 5 of the outer member 1, and the male screw portion 6 of the inner member 2. Alternatively, the melt deformable portion 19 may be formed on both the outer thread 1 and the female screw portion 5 of the outer member 1.

（７）上記実施形態では、外側部材１を、ナット１７とし、内側部材２を、ケース１１の突出部１２としたが、外側部材１を、雌ネジ部を形成したケースとし、内側部材２を、ボルトとする等、外側部材１や内側部材２は適宜変更してもよい。 (7) In the above embodiment, the outer member 1 is the nut 17 and the inner member 2 is the protruding portion 12 of the case 11. However, the outer member 1 is a case in which a female screw portion is formed, and the inner member 2 is The outer member 1 and the inner member 2 may be appropriately changed, such as a bolt.

（８）上記実施形態では、接触部材３をニードルベアリング１４としたが、接触部材３は適宜変更してもよい。具体的には、接触部材３は、ボールベアリング、オイルシール、ブッシュ、又は、内側部材２の径方向内側Ｒ１に嵌め込んだ嵌め込み部材等でもよい。 (8) Although the contact member 3 is the needle bearing 14 in the above embodiment, the contact member 3 may be appropriately changed. Specifically, the contact member 3 may be a ball bearing, an oil seal, a bush, or a fitting member that is fitted into the radially inner side R 1 of the inner member 2.

（９）上記実施形態では、各貫通孔部１８は、径方向内側Ｒ１の端部（内側端部１８Ａ）から径方向外側Ｒ２の端部まで同じ内径である円柱状の孔としたが、各貫通孔が、例えば段付き孔や円錐台状の孔など、径方向Ｒの位置によって内径が異なる形状とされていてもよい。この場合において、溶融変形部１９の形成を容易にするため、各貫通孔の内径が、径方向外側に向かうに従って連続的又は段階的に大きくなるように形成されていると好適である。 (9) In the above embodiment, each through-hole portion 18 is a cylindrical hole having the same inner diameter from the end portion (inner end portion 18A) of the radially inner side R1 to the end portion of the radially outer side R2, The through hole may have a shape with a different inner diameter depending on the position in the radial direction R, such as a stepped hole or a truncated cone hole. In this case, in order to facilitate the formation of the melt deformed portion 19, it is preferable that the inner diameter of each through-hole is formed so as to increase continuously or stepwise as it goes radially outward.

（１０）上記実施形態では、溶融変形部１９をレーザ溶接装置２１により形成する場合を例として説明した。しかし、溶融変形部１９を形成する手段はこれに限定されず、レーザ溶接以外の溶接装置やその他の溶融加熱装置により溶融変形部１９を形成してもよい。 (10) In the above embodiment, the case where the melt deformed portion 19 is formed by the laser welding device 21 has been described as an example. However, the means for forming the melt deformed portion 19 is not limited to this, and the melt deformed portion 19 may be formed by a welding device other than laser welding or other melt heating devices.

（１１）なお、上述した各実施形態で開示された構成は、矛盾が生じない限り、他の実施形態で開示された構成と組み合わせて適用することも可能である。その他の構成に関しても、本明細書において開示された実施形態は全ての点で単なる例示に過ぎない。従って、本開示の趣旨を逸脱しない範囲内で、適宜、種々の改変を行うことが可能である。 (11) It should be noted that the configurations disclosed in the above-described embodiments can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. Regarding other configurations, the embodiments disclosed herein are merely examples in all respects. Accordingly, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

３．上記実施形態の概要
以下、上記において説明した締結構造の概要について説明する。 3. Outline of the above embodiment Hereinafter, an outline of the fastening structure described above will be described.

締結構造は、円筒状の内周面（１Ａ）を有すると共に前記内周面（１Ａ）に雌ネジ部（５）が形成された外側部材（１）と、円筒状の外周面（２Ｂ）を有すると共に前記外周面（２Ｂ）に雄ネジ部（６）が形成された内側部材（２）と、を備え、前記雌ネジ部（５）が前記雄ネジ部（６）に螺合しており、前記外側部材（１）は、当該外側部材（１）を径方向（Ｒ）に貫通する貫通孔部（１８）を備え、前記雄ネジ部（６）及び前記雌ネジ部（５）の少なくとも一方における、前記貫通孔部（１８）の前記径方向（Ｒ）の内側端部（１８Ａ）に面する部分に、溶融変形部（１９）が形成されている。 The fastening structure includes an outer member (1) having a cylindrical inner peripheral surface (1A) and having an internal thread portion (5) formed on the inner peripheral surface (1A), and a cylindrical outer peripheral surface (2B). And an inner member (2) having a male screw part (6) formed on the outer peripheral surface (2B), and the female screw part (5) is screwed to the male screw part (6). The outer member (1) includes a through hole portion (18) penetrating the outer member (1) in the radial direction (R), and at least the male screw portion (6) and the female screw portion (5). On the other hand, a melt-deformed portion (19) is formed at a portion of the through hole portion (18) facing the inner end portion (18A) in the radial direction (R).

このような構成によれば、溶融変形部（１９）が形成された部分でネジ部が変形しているため、外側部材（１）の雌ネジ部（５）と内側部材（２）の雄ネジ部（６）とが相対的に回転することを規制できる。よって、外側部材（２）と内側部材（２）とが外れない締結構造を実現できる。そして、この締結構造では、外側部材（１）のと内側部材（２）とが外れることを規制するための部材を別途備える必要がないため、締結構造の部材点数を少なく抑えることができると共に締結構造の設置スペースを小さく抑えることができる。なお、溶融変形部（１９）は、例えば、外側部材（１）よりも径方向外側（Ｒ２）から、貫通孔部（１８）を利用して雄ネジ部（６）又は雌ネジ部（５）の一部を溶融させることで形成することができる。このように、本締結構造は、貫通孔部（１８）を備えることにより、比較的容易に溶融変形部（１９）を形成することが可能な構造となっている。 According to such a configuration, since the screw portion is deformed at the portion where the melt-deformed portion (19) is formed, the female screw portion (5) of the outer member (1) and the male screw of the inner member (2). It can control that a part (6) rotates relatively. Therefore, the fastening structure in which the outer member (2) and the inner member (2) do not come off can be realized. And in this fastening structure, since it is not necessary to separately provide a member for restricting that the outer member (1) and the inner member (2) come off, the number of members of the fastening structure can be reduced and fastening can be performed. The installation space for the structure can be kept small. The melt deformed portion (19) is formed, for example, from the radially outer side (R2) of the outer member (1) by using the through hole portion (18), the male screw portion (6) or the female screw portion (5). It can be formed by melting a part of. Thus, this fastening structure is a structure which can form a melt deformation part (19) comparatively easily by providing a through-hole part (18).

ここで、前記内側部材（２）は内周面（２Ａ）を有する筒状に形成され、前記内側部材（２）の内周面（２Ａ）に、前記内側部材（２）とは別の接触部材（３）が接触していると好適である。 Here, the inner member (2) is formed in a cylindrical shape having an inner peripheral surface (2A), and contacts the inner peripheral surface (2A) of the inner member (2) separately from the inner member (2). It is preferable that the member (3) is in contact.

この構成によれば、内側部材（２）の内周面（２Ａ）には接触部材（３）が接触しているため、もし仮に内側部材（２）が変形した場合には接触部材（３）にも影響を与える可能性がある。しかし、この締結構造では、外側部材（１）の雌ネジ部（５）又は内側部材（２）の雄ネジ部（６）に溶融変形部（１９）を形成するだけであるため、例えば、カシメを行う場合等に比べて、内側部材（２）に大きな力が加わり難く、内側部材（２）や外側部材（１）が径方向（Ｒ）の変形を非常に小さく抑えることができる。そのため、内側部材（２）の内周面（２Ａ）に接触している接触部材（３）に与える影響も最小限に抑えることができる。 According to this structure, since the contact member (3) is in contact with the inner peripheral surface (2A) of the inner member (2), if the inner member (2) is deformed, the contact member (3) May also affect. However, in this fastening structure, the melted deformation part (19) is only formed in the female thread part (5) of the outer member (1) or the male thread part (6) of the inner member (2). Compared with the case where it performs, a big force is hard to be added to an inner member (2), and the inner member (2) and an outer member (1) can suppress a deformation | transformation of radial direction (R) very small. Therefore, the influence on the contact member (3) in contact with the inner peripheral surface (2A) of the inner member (2) can be minimized.

また、前記貫通孔部（１８）は、前記外側部材（１）の周方向に沿って均等な間隔で複数個所に形成されていると好適である。 Further, it is preferable that the through-hole portions (18) are formed at a plurality of locations at equal intervals along the circumferential direction of the outer member (1).

この構成によれば、本締結構造による締結のために、外側部材（１）よりも径方向外側（Ｒ２）から溶融変形部（１９）を形成する作業を実施する場合に、複数の貫通孔部（１８）のうちから作業を行い易い貫通孔部（１８）を選択して溶融変形部（１９）を形成する作業を行うことができる。そのため、外側部材（１）に貫通孔部（１８）が１つのみ形成されている場合に比べて、溶融変形部（１９）を形成する作業を行い易くなるという利点がある。 According to this configuration, when performing the operation of forming the melt deformed portion (19) from the radially outer side (R2) than the outer member (1) for fastening by the present fastening structure, a plurality of through hole portions The work of forming the melt deformed part (19) can be performed by selecting the through hole part (18) that is easy to work from (18). Therefore, there is an advantage that the operation of forming the melt deformed portion (19) is facilitated as compared with the case where only one through hole portion (18) is formed in the outer member (1).

また、前記外側部材（１）と前記内側部材（２）とは材質が異なり、前記溶融変形部（１９）は、前記外側部材（１）と前記内側部材（２）とのうちの融点の低い方の部材に形成されていると好適である。 Further, the outer member (1) and the inner member (2) are made of different materials, and the melting deformation part (19) has a low melting point between the outer member (1) and the inner member (2). It is suitable if it is formed on the other member.

この構成によれば、外側部材（１）と内側部材（２）とのうち融点が低い方の部材に溶融変形部（１９）を形成することで、融点が高い方の部材に溶融変形部（１９）を形成する場合に比べて、溶融変形部（１９）を形成し易くすることができると共に、当該溶融変形部を形成する際における外側部材（１）及び内側部材（２）の変形を小さく抑えることができる。 According to this configuration, by forming the melt deformed portion (19) in the member having the lower melting point of the outer member (1) and the inner member (2), the melt deformed portion ( Compared with the case of forming 19), it is possible to easily form the melt-deformed portion (19) and to reduce the deformation of the outer member (1) and the inner member (2) when forming the melt-deformed portion. Can be suppressed.

本開示に係る技術は、外側部材の雌ネジ部が内側部材の雄ネジ部に螺合している締結構造に利用することができる。 The technology according to the present disclosure can be used for a fastening structure in which a female screw portion of the outer member is screwed with a male screw portion of the inner member.

１：外側部材
２：内側部材
１Ａ：内周面
２Ａ：内周面
２Ｂ：外周面
３：接触部材
５：雌ネジ部
６：雄ネジ部
１８：貫通孔部
１８Ａ：内側端部
１９：溶融変形部
1: outer member 2: inner member 1A: inner peripheral surface 2A: inner peripheral surface 2B: outer peripheral surface 3: contact member 5: female screw portion 6: male screw portion 18: through hole portion 18A: inner end portion 19: melt deformation Part

Claims

An outer member having a cylindrical inner peripheral surface and having a female screw portion formed on the inner peripheral surface; and an inner member having a cylindrical outer peripheral surface and having a male screw portion formed on the outer peripheral surface. ,
The female screw part is screwed into the male screw part,
The outer member includes a through-hole portion that penetrates the outer member in the radial direction,
A fastening structure in which at least one of the male screw portion and the female screw portion has a melt-deformed portion at a portion facing the radially inner end portion of the through-hole portion.

The inner member is formed in a cylindrical shape having an inner peripheral surface,
The fastening structure according to claim 1, wherein a contact member different from the inner member is in contact with an inner peripheral surface of the inner member.

The fastening structure according to claim 1 or 2, wherein the through-hole portions are formed at a plurality of locations at equal intervals along the circumferential direction of the outer member.

The material of the outer member and the inner member is different,
The fastening structure according to any one of claims 1 to 3, wherein the melt deformation portion is formed on a member having a lower melting point of the outer member and the inner member.