JP6998195B2 - Fastening structure - Google Patents

Fastening structure Download PDF

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JP6998195B2
JP6998195B2 JP2017239453A JP2017239453A JP6998195B2 JP 6998195 B2 JP6998195 B2 JP 6998195B2 JP 2017239453 A JP2017239453 A JP 2017239453A JP 2017239453 A JP2017239453 A JP 2017239453A JP 6998195 B2 JP6998195 B2 JP 6998195B2
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press
diameter
fitting
nut
seat surface
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JP2019105344A (en
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利幸 北野
昭 安川
誠 十河
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Toyo Tire Corp
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Toyo Tire Corp
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本発明は締結構造体に関し、特に締結部材による軸力のばらつきを小さくしつつ加工し易くできる締結構造体に関するものである。 The present invention relates to a fastening structure, and more particularly to a fastening structure that can be easily machined while reducing the variation in axial force due to the fastening member.

固定部材に設けられる貫通孔に、ボルトやナットなどの締結部材の座面から突出する筒部を圧入して、締結部材を固定部材に固定する技術がある。この技術において、筒部を貫通孔に圧入するときに固定部材が削られて生じた削り屑や、固定部材の塑性変形によるバリが、締結部材の座面と固定部材との間に挟まれないように、締結部材の座面に凹部を設ける技術が知られている(特許文献1)。この凹部に削り屑やバリを収容することで、締結部材の座面と固定部材とを密着させることができ、締結部材による軸力のばらつきを小さくできる。 There is a technique for fixing a fastening member to a fixing member by press-fitting a tubular portion protruding from the seat surface of the fastening member such as a bolt or a nut into a through hole provided in the fixing member. In this technique, shavings generated by scraping the fixing member when the cylinder portion is press-fitted into the through hole and burrs due to plastic deformation of the fixing member are not sandwiched between the seat surface of the fastening member and the fixing member. As described above, a technique of providing a recess on the seat surface of the fastening member is known (Patent Document 1). By accommodating shavings and burrs in this recess, the seat surface of the fastening member and the fixing member can be brought into close contact with each other, and the variation in the axial force due to the fastening member can be reduced.

国際公開第2006/004084号International Publication No. 2006/004084

しかしながら、上記従来の技術では、筒部の周囲にたまり易い削り屑やバリを凹部に収容するため、座面と筒部との隅を凹ませて凹部を形成する必要がある。このように、締結部材には削り屑やバリを収容するための凹部を加工し難いという問題点がある。 However, in the above-mentioned conventional technique, in order to store shavings and burrs that tend to accumulate around the cylinder portion in the recess, it is necessary to dent the corners of the seat surface and the cylinder portion to form the recess. As described above, the fastening member has a problem that it is difficult to process a recess for accommodating shavings and burrs.

本発明は上述した問題点を解決するためになされたものであり、締結部材による軸力のばらつきを小さくしつつ加工し易くできる締結構造体を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a fastening structure that can be easily machined while reducing the variation in axial force due to the fastening member.

この目的を達成するために本発明の締結構造体は、相手部材が組み付けられるねじ山と、座面から垂直に突出する筒部とを有する締結部材と、前記筒部が軸方向へ挿入される貫通孔が貫通形成されると共に、少なくとも前記貫通孔の内面が前記締結部材に比べて低硬度の固定部材とを備え、前記貫通孔の前記内面は、前記筒部が圧入される圧入部と、前記座面が接触する前記固定部材の接触面と前記圧入部とを連結すると共に、前記筒部のうち前記圧入部に圧入される部分の外径と比べて内径が大きい大径部とを備え、前記筒部の外周面は、前記圧入部の内径よりも外径が小さい谷部と、前記圧入部の内径よりも外径が大きい頂部と、が周方向に交互に配置される歯部と、前記歯部と前記座面とを連結すると共に、軸直角断面が円形状の連結部と、を備え、前記連結部の外径は、前記歯部の前記頂部の外径と同一であって、前記圧入部の内径よりも大きく、前記大径部の内径よりも小さく設定されるIn order to achieve this object, the fastening structure of the present invention has a fastening member having a screw thread to which a mating member is assembled, a tubular portion vertically protruding from the seat surface, and the tubular portion inserted in the axial direction. The through hole is formed through, and at least the inner surface of the through hole is provided with a fixing member having a lower hardness than the fastening member, and the inner surface of the through hole includes a press-fitting portion into which the tubular portion is press-fitted. The contact surface of the fixing member with which the seat surface is in contact is connected to the press-fitting portion, and a large-diameter portion having an inner diameter larger than the outer diameter of the portion of the tubular portion to be press-fitted into the press-fitting portion is provided. On the outer peripheral surface of the tubular portion, a valley portion having an outer diameter smaller than the inner diameter of the press-fitting portion and a top portion having an outer diameter larger than the inner diameter of the press-fitting portion are alternately arranged in the circumferential direction. The tooth portion and the seat surface are connected to each other, and a connecting portion having a circular cross section perpendicular to the axis is provided, and the outer diameter of the connecting portion is the same as the outer diameter of the top portion of the tooth portion. , It is set to be larger than the inner diameter of the press-fitting portion and smaller than the inner diameter of the large diameter portion .

請求項1記載の締結構造体によれば、筒部のうち貫通孔の圧入部に圧入される部分の外径と比べて、貫通孔の大径部の内径が大きいので、筒部を圧入部に圧入することで、大径部の内面と締結部材との間に空間が形成される。この空間に、筒部を圧入部に圧入するときに生じる削り屑やバリを収容できるので、締結部材の座面と固定部材の接触面との間に削り屑やバリを挟み難くできる。その結果、座面と接触面とを密着させ易くして、締結部材による軸力のばらつきを小さくできる。 According to the fastening structure according to claim 1, since the inner diameter of the large diameter portion of the through hole is larger than the outer diameter of the portion of the cylinder portion to be press-fitted into the press-fitting portion of the through hole, the cylinder portion is press-fitted. A space is formed between the inner surface of the large-diameter portion and the fastening member by press-fitting into. Since shavings and burrs generated when the cylinder portion is press-fitted into the press-fitting portion can be stored in this space, it is possible to prevent shavings and burrs from being caught between the seat surface of the fastening member and the contact surface of the fixing member. As a result, the bearing surface and the contact surface can be easily brought into close contact with each other, and the variation in the axial force due to the fastening member can be reduced.

さらに、貫通孔の接触面側という内径を変化させ易い位置に大径部が形成される。即ち、削り屑を収容する空間を形成するための大径部の形成を容易にできる。これらの結果、締結部材による軸力のばらつきを小さくしつつ、締結構造体を加工し易くできる。 Further, a large diameter portion is formed on the contact surface side of the through hole at a position where the inner diameter can be easily changed. That is, it is possible to easily form a large-diameter portion for forming a space for accommodating shavings. As a result, it is possible to easily process the fastening structure while reducing the variation in the axial force due to the fastening member.

部の外周面に設けられる歯部は、圧入部の内径よりも外径が小さい谷部と、圧入部の内径よりも外径が大きい頂部と、が周方向に交互に配置されている。これにより、頂部を圧入部に食い込ませるように歯部を圧入部に圧入して、固定部材に対して締結部材を回転不能に固定できる。さらに、圧入部への歯部の圧入時には谷部へ向かって圧入部の内面が変形し、圧入荷重が小さくなるので、締結構造体の製造を容易にできる。 In the tooth portion provided on the outer peripheral surface of the tubular portion, a valley portion having an outer diameter smaller than the inner diameter of the press-fit portion and a top portion having an outer diameter larger than the inner diameter of the press-fit portion are alternately arranged in the circumferential direction. As a result, the tooth portion can be press-fitted into the press-fitting portion so that the top portion bites into the press-fitting portion, and the fastening member can be non-rotatably fixed to the fixing member. Further, when the tooth portion is press-fitted into the press-fitting portion, the inner surface of the press-fitting portion is deformed toward the valley portion and the press-fitting load is reduced, so that the fastening structure can be easily manufactured.

部の外周面に設けられる軸直角断面が円形状の連結部により、歯部と座面とが接続される。筒部の外周面のうち座面に連なる部分にまで頂部および谷部を形成するのは比較的難しいため、連結部を設けることで、締結部材を加工し易くできる。 The tooth portion and the seat surface are connected by a connecting portion having a circular cross section perpendicular to the axis provided on the outer peripheral surface of the tubular portion. Since it is relatively difficult to form a top portion and a valley portion up to a portion of the outer peripheral surface of the tubular portion that is continuous with the seat surface, it is possible to easily process the fastening member by providing the connecting portion.

また、連結部の外径が、圧入部の内径よりも大きいので、圧入部への歯部の圧入時に、固定部材から歯部に付与される軸方向の荷重を連結部を介して締結部材の座面側で受け易くできる。これにより、歯部の耐荷重を大きくできる。 Further, since the outer diameter of the connecting portion is larger than the inner diameter of the press-fitting portion, the axial load applied from the fixing member to the tooth portion when the tooth portion is press-fitted into the press-fitting portion is applied to the fastening member via the connecting portion. It can be easily received on the seat side. As a result, the load capacity of the tooth portion can be increased.

ここで、歯部が貫通孔(圧入部)に圧入される場合に比べて、連結部が貫通孔に圧入される方が、圧入荷重が増大する。しかし、筒部の座面側に位置する連結部の外径が、貫通孔の接触面側に位置する大径部の内径よりも小さく設定されるので、連結部を貫通孔に圧入し難くできる。そのため、圧入部の内径より連結部の外径を大きくしても、貫通孔への連結部の圧入に起因した圧入荷重の増大を大径部によって抑制できる。よって、歯部の耐荷重を大きくしつつ、圧入荷重の増大を抑制して締結構造体の製造をより容易にできる。
更に、連結部の外径が歯部の頂部の外径と同一であるので、大径部と連結部との間の空間を小さくすることなく、歯部や連結部を形成し易くできる。
請求項2記載の締結構造体によれば、締結部材は、軸方向の一端面に座面を形成する座面形成部と、座面形成部の軸方向の一部から軸直角方向に張り出して座面を延長するフランジ部と、を備える。フランジ部を除く座面形成部の外径が大径部の外径よりも大きい。これにより、締結部材に軸力が付与されたときに、フランジ部の付け根に応力を集中し難くできるので、請求項1の効果に加え、締結部材による軸力のばらつきを小さくできる。
請求項3記載の締結構造体によれば、締結部材は、相手部材としてのボルトがめねじによるねじ山に組み付けられるナットである。貫通孔の内面は、圧入部に対し接触面とは反対側に位置する小径部を備えている。小径部の内径は、圧入部の内径よりも小さく、ナットのねじ山の谷径よりも大きい。これにより、圧入部に圧入されたナットのねじ山へ、小径部によってボルトを案内し易くでき、ナットにボルトを組み付けやすくできる。よって、請求項1又は2の効果に加え、締結作業性を向上できる。
請求項4記載の締結構造体によれば、締結部材は、相手部材としてのボルトがめねじによるねじ山に組み付けられるナットである。締結構造体は、固定部材に対し接触面とは反対側に間隔を空けて配置されるロッドを備える。このロッドは、固定部材と一体成形され、固定部材の貫通孔に挿入されたボルトが挿入可能な位置に挿入孔が形成されている。ボルトではなくナットを固定部材に圧入するので、この圧入後でも、固定部材とロッドとの間に筒状部材を配置でき、挿入孔、筒状部材および貫通孔にボルトを挿入してナットに組み付けることができる。よって、請求項1から3の効果に加え、筒状部材を固定部材およびロッドに取り付ける作業を容易にできる。
Here, the press-fitting load increases when the connecting portion is press-fitted into the through-hole as compared with the case where the tooth portion is press-fitted into the through-hole (press-fitting portion). However, since the outer diameter of the connecting portion located on the seat surface side of the cylinder portion is set smaller than the inner diameter of the large diameter portion located on the contact surface side of the through hole, it is difficult to press the connecting portion into the through hole. .. Therefore, even if the outer diameter of the connecting portion is made larger than the inner diameter of the press-fitting portion, the increase in the press-fitting load due to the press-fitting of the connecting portion into the through hole can be suppressed by the large-diameter portion. Therefore , it is possible to more easily manufacture the fastening structure by suppressing the increase in the press-fitting load while increasing the load capacity of the tooth portion.
Further, since the outer diameter of the connecting portion is the same as the outer diameter of the top of the tooth portion, the tooth portion and the connecting portion can be easily formed without reducing the space between the large diameter portion and the connecting portion.
According to the fastening structure according to claim 2, the fastening member projects from a seat surface forming portion that forms a seating surface on one end surface in the axial direction and a part of the seating surface forming portion in the axial direction in a direction perpendicular to the axis. A flange portion for extending the seat surface is provided. The outer diameter of the seat surface forming portion excluding the flange portion is larger than the outer diameter of the large diameter portion. As a result, when the axial force is applied to the fastening member, it is difficult to concentrate the stress on the base of the flange portion, so that in addition to the effect of claim 1, the variation in the axial force due to the fastening member can be reduced.
According to the fastening structure according to claim 3, the fastening member is a nut in which a bolt as a mating member is assembled to a thread by a female screw. The inner surface of the through hole is provided with a small diameter portion located on the side opposite to the contact surface with respect to the press-fitting portion. The inner diameter of the small diameter portion is smaller than the inner diameter of the press-fitting portion and larger than the valley diameter of the thread of the nut. As a result, the bolt can be easily guided to the thread of the nut press-fitted into the press-fitting portion by the small diameter portion, and the bolt can be easily assembled to the nut. Therefore, in addition to the effects of claim 1 or 2, the fastening workability can be improved.
According to the fastening structure according to claim 4, the fastening member is a nut in which a bolt as a mating member is assembled to a thread by a female screw. The fastening structure comprises rods spaced apart from the contact surface with respect to the fixing member. This rod is integrally molded with the fixing member, and an insertion hole is formed at a position where a bolt inserted into the through hole of the fixing member can be inserted. Since the nut is press-fitted into the fixing member instead of the bolt, the tubular member can be placed between the fixing member and the rod even after this press-fitting, and the bolt is inserted into the insertion hole, the tubular member and the through hole to be assembled to the nut. be able to. Therefore, in addition to the effects of claims 1 to 3, the work of attaching the tubular member to the fixing member and the rod can be easily performed.

請求項5記載の締結構造体によれば、連結部の軸方向長さが大径部の軸方向長さよりも小さく設定される。これにより、圧入部に連結部が圧入されることを防止できるので、貫通孔への連結部の圧入に起因した圧入荷重の増大を防止できる。その結果、請求項1から4のいずれかの効果に加え、締結構造体の製造をさらに容易にできる。 According to the fastening structure according to claim 5, the axial length of the connecting portion is set to be smaller than the axial length of the large diameter portion. As a result, it is possible to prevent the connecting portion from being press-fitted into the press-fitting portion, so that it is possible to prevent an increase in the press-fitting load due to the press-fitting of the connecting portion into the through hole. As a result, in addition to the effect of any one of claims 1 to 4, the manufacturing of the fastening structure can be further facilitated.

本発明の第1実施の形態における締結構造体を有するトルクロッドの側面図である。It is a side view of the torque rod which has the fastening structure in 1st Embodiment of this invention. (a)はナットの片側断面図であり、(b)はロッドの断面図である。(A) is a cross-sectional view of one side of the nut, and (b) is a cross-sectional view of the rod. 締結構造体の断面図である。It is sectional drawing of the fastening structure. 第2実施の形態における締結構造体の断面図である。It is sectional drawing of the fastening structure in 2nd Embodiment.

以下、本発明の好ましい実施の形態について、添付図面を参照して説明する。まず、図1を参照して、本発明の第1実施の形態における締結構造体20を有するトルクロッド1について説明する。図1は、トルクロッド1の側面図である。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the torque rod 1 having the fastening structure 20 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view of the torque rod 1.

図1に示すように、トルクロッド1は、エンジンからのトルクを受けることで、加速時におけるエンジンのロール方向の変位を規制するための防振装置である。トルクロッド1は、車体側(図示せず)に取り付けられる第1ブッシュ2と、エンジン側(図示せず)に取り付けられる第2ブッシュ6と、第1ブッシュ2及び第2ブッシュ6を互いに連結するロッド10,11とを備える。なお、第1ブッシュ2をエンジン側に取り付け、第2ブッシュ6を車体側に取り付けても良い。 As shown in FIG. 1, the torque rod 1 is a vibration isolator for regulating the displacement of the engine in the roll direction during acceleration by receiving torque from the engine. The torque rod 1 connects the first bush 2 attached to the vehicle body side (not shown), the second bush 6 attached to the engine side (not shown), the first bush 2 and the second bush 6 to each other. It includes rods 10 and 11. The first bush 2 may be attached to the engine side and the second bush 6 may be attached to the vehicle body side.

第1ブッシュ2は、筒状の外側部材3と、外側部材3の内周側に配置される筒状の内側部材4と、外側部材3の内周面と内側部材4の外周面とに加硫接着されるゴム状弾性体から構成される防振基体5とを備える。内側部材4は、車体側に取り付けられる。 The first bush 2 is added to the tubular outer member 3, the tubular inner member 4 arranged on the inner peripheral side of the outer member 3, the inner peripheral surface of the outer member 3, and the outer peripheral surface of the inner member 4. A vibration-proof substrate 5 made of a rubber-like elastic body to be vulcanized is provided. The inner member 4 is attached to the vehicle body side.

第2ブッシュ6は、円筒状の外側部材7と、外側部材7の内周側に配置される円筒状の内側部材8と、外側部材7の内周面と内側部材8の外周面とに加硫接着されるゴム状弾性体から構成される防振基体(図示せず)とを備える。外側部材7は、ブラケット(図示せず)を介してエンジン側に取り付けられる。 The second bush 6 is added to the cylindrical outer member 7, the cylindrical inner member 8 arranged on the inner peripheral side of the outer member 7, the inner peripheral surface of the outer member 7, and the outer peripheral surface of the inner member 8. It is provided with a vibration-proof substrate (not shown) composed of a rubber-like elastic body to be vulcanized. The outer member 7 is attached to the engine side via a bracket (not shown).

ロッド10,11は、第1ブッシュ2の外側部材3との一体成形品であり、アルミニウム合金から構成される。ロッド10,11及び外側部材3は、ダイカスト等の鋳造によって形成される。ロッド10,11は、外側部材3の外周面から径方向に延びて設けられる一対の部材である。ロッド10,11は、第1ブッシュ2の軸心に対して、第2ブッシュ6の軸心が垂直となるように第1ブッシュ2と第2ブッシュ6とを連結する。 The rods 10 and 11 are integrally molded products with the outer member 3 of the first bush 2, and are made of an aluminum alloy. The rods 10 and 11 and the outer member 3 are formed by casting such as die casting. The rods 10 and 11 are a pair of members provided extending in the radial direction from the outer peripheral surface of the outer member 3. The rods 10 and 11 connect the first bush 2 and the second bush 6 so that the axis of the second bush 6 is perpendicular to the axis of the first bush 2.

一対のロッド10,11の先端側(外側部材3から離れた端部側)には、それぞれ貫通孔12,13が設けられる。その貫通孔12,13が設けられる部分における一対のロッド10,11の対向間隔は、内側部材8の軸方向寸法と略同一に設定される。一対のロッド10,11の間に内側部材8を配置して、貫通孔12,13と内側部材8の内周とにボルト14を挿入し、そのボルト14にナット15を組み付けることで、ボルト14及びナット15によって内側部材8とロッド10,11とが締結固定される。 Through holes 12 and 13 are provided on the tip end side (end side away from the outer member 3) of the pair of rods 10 and 11, respectively. The facing distance between the pair of rods 10 and 11 in the portion where the through holes 12 and 13 are provided is set to be substantially the same as the axial dimension of the inner member 8. By arranging the inner member 8 between the pair of rods 10 and 11, inserting the bolt 14 into the through holes 12 and 13 and the inner circumference of the inner member 8, and assembling the nut 15 to the bolt 14, the bolt 14 The inner member 8 and the rods 10 and 11 are fastened and fixed by the nut 15.

本実施の形態では、このナット15(締結部材)とロッド10(固定部材)とが締結構造体20である。ナット15について図2(a)を参照して詳しく説明する。図2(a)は、ナット15の片側断面図である。図2(a)では、ナット15の軸心Aより紙面右側を断面図として示し、軸心Aより紙面左側を側面図として示している。図2(a)の側面図では、頂部28の外形線を図示し、谷部27の外形線の図示を省略し、谷部27と頂部28とによる歯部25を模式的に図示している。また、本明細書では、軸心Aの軸方向を単に軸方向とし、軸心Aの軸直角方向を単に軸直角方向として説明する。 In the present embodiment, the nut 15 (fastening member) and the rod 10 (fixing member) are the fastening structure 20. The nut 15 will be described in detail with reference to FIG. 2 (a). FIG. 2A is a one-sided cross-sectional view of the nut 15. In FIG. 2A, the right side of the paper surface from the axis A of the nut 15 is shown as a cross-sectional view, and the left side of the paper surface from the axis A is shown as a side view. In the side view of FIG. 2A, the outline of the top 28 is shown, the outline of the valley 27 is omitted, and the tooth portion 25 composed of the valley 27 and the top 28 is schematically shown. .. Further, in the present specification, the axial direction of the axial center A is simply referred to as the axial direction, and the axial perpendicular direction of the axial center A is simply referred to as the axial perpendicular direction.

図2(a)に示すように、ナット15は、ロッド10を構成するアルミニウムよりも高硬度の部材(例えば鋼材)から構成される。ナット15は、軸方向の一端面が座面22である円筒状の本体部21と、本体部21の座面22から垂直に突出する筒部24とを備える。本体部21には、座面22側から軸直角方向に張り出してフランジ部23が設けられる。フランジ部23によって、座面22の面積が広げられる。本体部21及び筒部24は、内周面が互いに連なる同一面である。その本体部21及び筒部24の内周面には、ボルト14(相手部材)が組み付けられるねじ山15a(めねじ)が設けられる。 As shown in FIG. 2A, the nut 15 is made of a member (for example, a steel material) having a hardness higher than that of aluminum constituting the rod 10. The nut 15 includes a cylindrical main body portion 21 whose one end surface in the axial direction is a seat surface 22, and a tubular portion 24 that projects vertically from the seat surface 22 of the main body portion 21. A flange portion 23 is provided on the main body portion 21 so as to project from the seat surface 22 side in a direction perpendicular to the axis. The flange portion 23 increases the area of the seat surface 22. The main body portion 21 and the tubular portion 24 are the same surface in which the inner peripheral surfaces are connected to each other. Threads 15a (female threads) to which bolts 14 (counterpart members) are assembled are provided on the inner peripheral surfaces of the main body 21 and the cylinder 24.

筒部24は、軸方向へロッド10の貫通孔12に挿入される部位である。筒部24の外周面は、筒部24の先端24a側(座面22から離れた側)の歯部25と、歯部25及び座面22を連結する連結部26とを備える。 The tubular portion 24 is a portion that is inserted into the through hole 12 of the rod 10 in the axial direction. The outer peripheral surface of the tubular portion 24 includes a tooth portion 25 on the tip 24a side (side away from the seat surface 22) of the tubular portion 24, and a connecting portion 26 connecting the tooth portion 25 and the seat surface 22.

歯部25は、貫通孔12に圧入される部位である。歯部25には、先端24a側を面取り形成した面取部24bが設けられる。この面取部24bによって、歯部25を貫通孔12に圧入するときの圧入荷重を低減できる共に、歯部25を貫通孔12の所望の位置に案内できる。 The tooth portion 25 is a portion that is press-fitted into the through hole 12. The tooth portion 25 is provided with a chamfered portion 24b formed by chamfering the tip 24a side. The chamfered portion 24b can reduce the press-fitting load when the tooth portion 25 is press-fitted into the through hole 12, and can guide the tooth portion 25 to a desired position of the through-hole 12.

歯部25は、互いに比較して外径L1が小さい谷部27と、外径L2が大きい頂部28と、が周方向に交互に等間隔に配置される。歯部25は、円筒状の筒部24に転造加工や切削加工、研削加工などを施して形成される。なお、ナット15の鋳造時や鍛造時に歯部25を形成しても良い。 In the tooth portions 25, the valley portion 27 having a smaller outer diameter L1 and the top portion 28 having a larger outer diameter L2 are arranged alternately at equal intervals in the circumferential direction. The tooth portion 25 is formed by subjecting a cylindrical tubular portion 24 to a rolling process, a cutting process, a grinding process, or the like. The tooth portion 25 may be formed when the nut 15 is cast or forged.

谷部27及び頂部28は、軸心Aと平行に形成されている。谷部27及び頂部28は、軸心A方向視において、略三角形状に形成されている。即ち、谷部27と頂部28とによる歯部25は、インボリュートセレーション状や三角山セレーション状に形成されている。なお、谷部27及び頂部28の軸心A方向視の形状を略台形状に形成し、複数の歯部を角形スプライン状やインボリュートスプライン状に形成しても良い。また、谷部27と頂部28とを等間隔に設ける必要もなく、谷部27と頂部28との間隔を適宜設定しても良い。 The valley portion 27 and the top portion 28 are formed in parallel with the axis A. The valley portion 27 and the top portion 28 are formed in a substantially triangular shape in the direction of the axial center A. That is, the tooth portion 25 formed by the valley portion 27 and the apex portion 28 is formed in an involute serration shape or a triangular mountain serration shape. The shape of the valley portion 27 and the top portion 28 in the axial direction A direction may be formed into a substantially trapezoidal shape, and a plurality of tooth portions may be formed into a square spline shape or an involute spline shape. Further, it is not necessary to provide the valley portion 27 and the top portion 28 at equal intervals, and the interval between the valley portion 27 and the top portion 28 may be appropriately set.

歯部25には、谷部27と連結部26とを軸方向に連結する傾斜面29が設けられている。この傾斜面29は、外径が連結部26へ向かうにつれてテーパ状に拡径される。これにより、谷部27と連結部26とが段差状に連なる場合に比べて、谷部27及び頂部28による歯部25の形成を容易にできる。 The tooth portion 25 is provided with an inclined surface 29 that connects the valley portion 27 and the connecting portion 26 in the axial direction. The inclined surface 29 is tapered in diameter as the outer diameter toward the connecting portion 26. As a result, the formation of the tooth portion 25 by the valley portion 27 and the top portion 28 can be facilitated as compared with the case where the valley portion 27 and the connecting portion 26 are connected in a stepped shape.

連結部26は、軸直角断面が円形状の部位である。連結部26の外径は、頂部28の外径L2と略同一に設定される。連結部26の外径が頂部28の外径L2と略同一とは、軸方向の全長に亘って外径が同一の円筒状の筒部24に転造加工などを施すことによって頂部28が僅かに盛り上がり、連結部26の外径よりも頂部28の外径L2が僅かに大きくなった場合を含む。 The connecting portion 26 is a portion having a circular cross section perpendicular to the axis. The outer diameter of the connecting portion 26 is set to be substantially the same as the outer diameter L2 of the top portion 28. The outer diameter of the connecting portion 26 is substantially the same as the outer diameter L2 of the top portion 28. This includes the case where the outer diameter L2 of the top 28 is slightly larger than the outer diameter of the connecting portion 26.

筒部24の外周面のうち座面22に連なる部分にまで谷部27及び頂部28(歯部25)を形成するのは比較的難しい。そこで、歯部25と座面22との間に連結部26を設けることで、歯部25を形成し易くできる。その結果、ナット15を加工し易くできる。 It is relatively difficult to form the valley portion 27 and the top portion 28 (tooth portion 25) up to the portion of the outer peripheral surface of the tubular portion 24 that is connected to the seat surface 22. Therefore, by providing the connecting portion 26 between the tooth portion 25 and the seat surface 22, the tooth portion 25 can be easily formed. As a result, the nut 15 can be easily machined.

連結部26の軸方向長さL3は1.0mm以下であることが好ましい。連結部26の軸方向長さL3が1.0mm以下であれば、ナット15を十分に軽くできる。さらに軸方向長さL3が小さい程、ナット15をより軽くできる。なお、連結部26の軸方向長さL3が小さくても連結部26が少なからず存在すれば、歯部25を十分に形成し易くできる。 The axial length L3 of the connecting portion 26 is preferably 1.0 mm or less. When the axial length L3 of the connecting portion 26 is 1.0 mm or less, the nut 15 can be sufficiently lightened. Further, the smaller the axial length L3, the lighter the nut 15. Even if the axial length L3 of the connecting portion 26 is small, if the connecting portion 26 is present in no small measure, the tooth portion 25 can be sufficiently easily formed.

次に図2(b)を参照してロッド10について詳しく説明する。図2(b)はロッド10の断面図である。なお、図2(b)ではロッド10のうち、貫通孔12及びその周囲を図示し、その他の部分を省略している。ロッド10は、ナット15よりも低硬度の部材である。図2(b)に示すように、ロッド10には貫通孔12が貫通形成されている。この貫通孔12の軸心Aは、貫通孔12に筒部24を挿入したときのナット15の軸心Aと略同一となる。 Next, the rod 10 will be described in detail with reference to FIG. 2 (b). FIG. 2B is a cross-sectional view of the rod 10. In FIG. 2B, the through hole 12 and its surroundings are shown in the rod 10, and other parts are omitted. The rod 10 is a member having a hardness lower than that of the nut 15. As shown in FIG. 2B, a through hole 12 is formed through the rod 10. The axial center A of the through hole 12 is substantially the same as the axial center A of the nut 15 when the tubular portion 24 is inserted into the through hole 12.

ロッド10は、貫通孔12の一端が開口している一端面(図2(b)紙面上側の面)が接触面30である。この接触面30は、ナット15の筒部24を貫通孔12に挿入したときに、ナット15の座面22が接触する部位である。 In the rod 10, one end surface (the surface on the upper side of the paper surface in FIG. 2B) where one end of the through hole 12 is open is the contact surface 30. The contact surface 30 is a portion where the seat surface 22 of the nut 15 comes into contact when the tubular portion 24 of the nut 15 is inserted into the through hole 12.

ロッド10の貫通孔12の内面は、接触面30へ向かって順に小径部31、圧入部32、大径部33を有している。小径部31は、ロッド11の貫通孔13に挿入されたボルト14がナット15に組み付けられる前において、貫通孔12内でボルト14を位置決めするための部位である。そのため、ボルト14の軸部の外径に合わせて小径部31の内径が設定されている。 The inner surface of the through hole 12 of the rod 10 has a small diameter portion 31, a press-fitting portion 32, and a large diameter portion 33 in this order toward the contact surface 30. The small diameter portion 31 is a portion for positioning the bolt 14 in the through hole 12 before the bolt 14 inserted into the through hole 13 of the rod 11 is assembled to the nut 15. Therefore, the inner diameter of the small diameter portion 31 is set according to the outer diameter of the shaft portion of the bolt 14.

圧入部32は、ナット15の筒部24(歯部25)が圧入される部位である。小径部31に筒部24が圧入されないように、圧入部32の軸方向長さが設定されている。圧入部32の内径L5は、歯部25の谷部27の外径L1よりも大きく、頂部28や連結部26の外径L2よりも小さく設定されている。 The press-fitting portion 32 is a portion where the tubular portion 24 (tooth portion 25) of the nut 15 is press-fitted. The axial length of the press-fitting portion 32 is set so that the tubular portion 24 is not press-fitted into the small-diameter portion 31. The inner diameter L5 of the press-fitting portion 32 is set to be larger than the outer diameter L1 of the valley portion 27 of the tooth portion 25 and smaller than the outer diameter L2 of the top portion 28 and the connecting portion 26.

大径部33は、圧入部32と接触面30とを連結する部位である。大径部33は、圧入部32に対して軸直角方向へ段差状に凹んで設けられる。大径部33の内径L4は、圧入部32の内径L5、及び、頂部28や連結部26の外径L2よりも大きく設定されている。大径部33の軸方向長さL6は、連結部26の軸方向長さL3よりも大きく設定されている。 The large diameter portion 33 is a portion that connects the press-fitting portion 32 and the contact surface 30. The large diameter portion 33 is provided so as to be recessed in a step shape in the direction perpendicular to the axis with respect to the press-fitting portion 32. The inner diameter L4 of the large diameter portion 33 is set to be larger than the inner diameter L5 of the press-fitting portion 32 and the outer diameter L2 of the top portion 28 and the connecting portion 26. The axial length L6 of the large diameter portion 33 is set to be larger than the axial length L3 of the connecting portion 26.

次に図3を参照して、圧入によりロッド10にナット15を固定した締結構造体20について説明する。なお、ロッド10の貫通孔12やナット15の各部寸法の符号は図3では省略しているため、その各部寸法についての説明は図2(a)及び図2(b)を参照する。 Next, with reference to FIG. 3, a fastening structure 20 in which the nut 15 is fixed to the rod 10 by press fitting will be described. Since the reference numerals of the dimensions of the through holes 12 and the nuts 15 of the rod 10 are omitted in FIG. 3, the description of the dimensions of each portion will be referred to with reference to FIGS. 2 (a) and 2 (b).

図3は締結構造体20の断面図である。図3に示すように、締結構造体20は、ナット15の座面22がロッド10の接触面30に接触するまで、ナット15の筒部24がロッド10の圧入部32に圧入される。このように、圧入によってロッド10にナット15を固定することで、ロッド10とナット15とを別々に管理しなくて良いので、部品管理を簡便にできる。 FIG. 3 is a cross-sectional view of the fastening structure 20. As shown in FIG. 3, in the fastening structure 20, the tubular portion 24 of the nut 15 is press-fitted into the press-fitting portion 32 of the rod 10 until the seat surface 22 of the nut 15 comes into contact with the contact surface 30 of the rod 10. By fixing the nut 15 to the rod 10 by press fitting in this way, it is not necessary to manage the rod 10 and the nut 15 separately, so that parts management can be simplified.

なお、ロッド10がアルミニウム合金製なので、貫通孔12に直接ねじ山(めねじ)を形成する場合には、締結強度などを確保するために、貫通孔12の軸方向長さを大きくしてねじ山を多く形成する必要があり好ましくない。また、ロッド10がアルミニウム合金製なので、ナット15をロッド10に溶接することが難しい。そのため、圧入によってロッド10にナット15を固定することが好ましい。 Since the rod 10 is made of an aluminum alloy, when a thread (female thread) is directly formed in the through hole 12, the axial length of the through hole 12 is increased in order to secure the fastening strength and the like. It is not preferable because many mountains need to be formed. Further, since the rod 10 is made of an aluminum alloy, it is difficult to weld the nut 15 to the rod 10. Therefore, it is preferable to fix the nut 15 to the rod 10 by press fitting.

圧入部32の内径L5が、歯部25の谷部27の外径L1よりも大きく、歯部25の頂部28の外径L2よりも小さいので、頂部28が圧入部32に食い込むように歯部25が圧入部32に圧入される。頂部28が圧入部32に食い込むことで、ロッド10に対してナット15を回転不能に固定できる。なお、圧入部32の内径L5と頂部28の外径L2との差(圧入代)を最低でも0.1mm程度設けることで、圧入部32に筒部24を十分な強さで固定できる。 Since the inner diameter L5 of the press-fitting portion 32 is larger than the outer diameter L1 of the valley portion 27 of the tooth portion 25 and smaller than the outer diameter L2 of the top portion 28 of the tooth portion 25, the tooth portion so that the top portion 28 bites into the press-fitting portion 32. 25 is press-fitted into the press-fitting portion 32. When the top portion 28 bites into the press-fitting portion 32, the nut 15 can be fixed to the rod 10 so as not to rotate. The cylinder portion 24 can be fixed to the press-fitting portion 32 with sufficient strength by providing a difference (press-fitting allowance) between the inner diameter L5 of the press-fitting portion 32 and the outer diameter L2 of the top portion 28 at least about 0.1 mm.

なお、歯部25には谷部27と頂部28とが周方向に交互に設けられ、ナット15よりもロッド10が低硬度なので、頂部28の食い込みによって、圧入部32の内周面の一部を谷部27側へ変形させることができる。これにより、圧入部32への歯部25の圧入荷重を小さくでき、圧入作業性を向上できる。また、谷部27及び頂部28が軸心Aに対して平行に設けられるので、軸方向へ歯部25が圧入部32に圧入されるときの圧入荷重を小さくできる。その結果、圧入作業性をより向上でき、締結構造体20の製造を容易にできる。 The tooth portions 25 are provided with valley portions 27 and top portions 28 alternately in the circumferential direction, and since the rod 10 has a lower hardness than the nut 15, a part of the inner peripheral surface of the press-fitting portion 32 is formed by the bite of the top portion 28. Can be transformed toward the valley 27 side. As a result, the press-fitting load of the tooth portion 25 on the press-fitting portion 32 can be reduced, and the press-fitting workability can be improved. Further, since the valley portion 27 and the top portion 28 are provided parallel to the axial center A, the press-fitting load when the tooth portion 25 is press-fitted into the press-fitting portion 32 in the axial direction can be reduced. As a result, the press-fitting workability can be further improved, and the fastening structure 20 can be easily manufactured.

連結部26の外径L2は、圧入部32の内径L5よりも大きいので、圧入部32への歯部25の圧入時に、ロッド10から歯部25に付与される軸方向の荷重(圧入時の反力)を連結部26を介してナット15の座面22側で受け易くできる。これにより、歯部25の頂部28側の耐荷重を大きくできる。その結果、歯部25の形状や、ナット15の素材などの自由度を向上できる。 Since the outer diameter L2 of the connecting portion 26 is larger than the inner diameter L5 of the press-fitting portion 32, the axial load (at the time of press-fitting) applied from the rod 10 to the tooth portion 25 when the tooth portion 25 is press-fitted into the press-fitting portion 32. The reaction force) can be easily received on the seat surface 22 side of the nut 15 via the connecting portion 26. As a result, the load capacity on the top 28 side of the tooth portion 25 can be increased. As a result, the degree of freedom of the shape of the tooth portion 25 and the material of the nut 15 can be improved.

ここで、歯部25が貫通孔12(圧入部32)に圧入される場合に比べて、連結部26が貫通孔12に圧入される方が圧入荷重が大きくなる。しかし、筒部24の座面側に位置する連結部26の外径L2が、貫通孔12の接触面30側に位置する大径部33の内径L4よりも小さく設定されているので、連結部26を貫通孔12に圧入し難くできる。そのため、圧入部32の内径L5より連結部26の外径L2を大きくしても、貫通孔12への連結部26の圧入に起因した圧入荷重の増大を大径部33によって抑制できる。これらの結果、歯部25の耐荷重を大きくしつつ、圧入荷重の増大を抑制して締結構造体20の製造を容易にできる。 Here, the press-fitting load is larger when the connecting portion 26 is press-fitted into the through-hole 12 than when the tooth portion 25 is press-fitted into the through hole 12 (press-fitting portion 32). However, since the outer diameter L2 of the connecting portion 26 located on the seat surface side of the tubular portion 24 is set smaller than the inner diameter L4 of the large diameter portion 33 located on the contact surface 30 side of the through hole 12, the connecting portion is set. 26 can be difficult to press into the through hole 12. Therefore, even if the outer diameter L2 of the connecting portion 26 is made larger than the inner diameter L5 of the press-fitting portion 32, the increase in the press-fitting load due to the press-fitting of the connecting portion 26 into the through hole 12 can be suppressed by the large-diameter portion 33. As a result, it is possible to easily manufacture the fastening structure 20 by suppressing an increase in the press-fitting load while increasing the load capacity of the tooth portion 25.

特に、連結部26の軸方向長さL3よりも大径部33の軸方向長さL6が大きいので、連結部26が圧入部32に圧入されることを防止できる。その結果、貫通孔12への連結部26の圧入に起因した圧入荷重の増大を防止できるので、締結構造体20の製造をさらに容易にできる。 In particular, since the axial length L6 of the large diameter portion 33 is larger than the axial length L3 of the connecting portion 26, it is possible to prevent the connecting portion 26 from being press-fitted into the press-fitting portion 32. As a result, it is possible to prevent an increase in the press-fitting load due to the press-fitting of the connecting portion 26 into the through hole 12, so that the manufacturing of the fastening structure 20 can be further facilitated.

ナット15よりもロッド10が低硬度なので、歯部25を圧入部32に圧入するとき、圧入部32の内周面などが歯部25で削られて削り屑(図示せず)が生じたり、ロッド10の塑性変形によって圧入部32の軸方向端部から上方に突出するようにバリ(図示せず)が生じたりする。このような削り屑やバリが座面22と接触面30との間に挟まれると、座面22と接触面30とが密着し難くなる。そうすると、座面22から接触面30に締結荷重が局所的に付与されて、ロッド10(接触面30)が座屈し易くなったり、ナット15とボルト14とによる締結が緩み易くなったりする。以上のように、削り屑やバリが座面22と接触面30との間に挟まれると、ナット15及びボルト14による軸力のばらつきが大きくなる。 Since the rod 10 has a lower hardness than the nut 15, when the tooth portion 25 is press-fitted into the press-fitting portion 32, the inner peripheral surface of the press-fitting portion 32 or the like is scraped by the tooth portion 25 to generate shavings (not shown). Due to the plastic deformation of the rod 10, burrs (not shown) may be generated so as to project upward from the axial end portion of the press-fitting portion 32. If such shavings or burrs are sandwiched between the seat surface 22 and the contact surface 30, it becomes difficult for the seat surface 22 and the contact surface 30 to come into close contact with each other. Then, a fastening load is locally applied from the seat surface 22 to the contact surface 30, and the rod 10 (contact surface 30) tends to buckle, or the fastening between the nut 15 and the bolt 14 tends to loosen. As described above, when shavings and burrs are sandwiched between the seat surface 22 and the contact surface 30, the variation in the axial force due to the nut 15 and the bolt 14 becomes large.

これに対して、本実施の形態では、圧入部32と接触面30との間に、筒部24の最大の外径L2(歯部25の頂部28の外径L2や連結部26の外径L2)よりも、内径L4が大きい大径部33が設けられている。これにより、座面22よりも先端24a側であって、大径部33の内面とナット15との間に空間35が形成される。この空間35に、圧入時の削り屑やバリを収容できるので、座面22と接触面30との間に削り屑やバリを挟み難くできる。その結果、座面22と接触面30とを密着させ易くできるので、ナット15及びボルト14による軸力のばらつきを小さくできる。 On the other hand, in the present embodiment, the maximum outer diameter L2 of the tubular portion 24 (the outer diameter L2 of the top 28 of the tooth portion 25 and the outer diameter of the connecting portion 26) between the press-fitting portion 32 and the contact surface 30. A large diameter portion 33 having an inner diameter L4 larger than that of L2) is provided. As a result, a space 35 is formed between the inner surface of the large diameter portion 33 and the nut 15 on the tip 24a side of the seat surface 22. Since the shavings and burrs at the time of press fitting can be stored in this space 35, it is possible to prevent the shavings and burrs from being caught between the seat surface 22 and the contact surface 30. As a result, the seat surface 22 and the contact surface 30 can be easily brought into close contact with each other, so that the variation in the axial force due to the nut 15 and the bolt 14 can be reduced.

さらに、貫通孔12の接触面30側という内径を変化させ易い位置に大径部33が形成されている。即ち、削り屑やバリを収容する空間35を形成するための大径部33の形成を容易にできる。特に、ロッド10は、ダイカスト等による鋳造品なので、多段階に外径を設定したピンを金型のキャビティに配置し、キャビティ内の溶湯が凝固した後にそのピンを抜くだけで、圧入部32及び大径部33を有する貫通孔12を容易に形成できる。これらの結果、ナット15及びボルト14による軸力のばらつきを大径部33によって小さくしつつ、大径部33の形成を容易にして締結構造体20を加工し易くできる。 Further, the large diameter portion 33 is formed on the contact surface 30 side of the through hole 12 at a position where the inner diameter can be easily changed. That is, it is possible to easily form a large diameter portion 33 for forming a space 35 for accommodating shavings and burrs. In particular, since the rod 10 is a cast product by die casting or the like, a pin having an outer diameter set in multiple stages is placed in the cavity of the die, and after the molten metal in the cavity is solidified, the pin is simply pulled out to form the press-fitting portion 32 and the press-fitting portion 32. A through hole 12 having a large diameter portion 33 can be easily formed. As a result, it is possible to facilitate the formation of the large diameter portion 33 and facilitate the processing of the fastening structure 20 while reducing the variation in the axial force due to the nut 15 and the bolt 14 by the large diameter portion 33.

筒部24の最大の外径L2に対する大径部33の内径L4の比率は、101~110%の範囲に設定されることが好ましい。この比率が高い程、軸心A側における座面22と接触面30との接触面積が小さくなるので、ロッド10の接触面30が座屈し易くなる。また、外径L2に対する内径L4の比率が高い程、座面22と接触面30との接触面積を確保して接触面30を座屈し難くするために、フランジ部23の外径を大きくする必要がある。 The ratio of the inner diameter L4 of the large diameter portion 33 to the maximum outer diameter L2 of the tubular portion 24 is preferably set in the range of 101 to 110%. The higher this ratio, the smaller the contact area between the seat surface 22 and the contact surface 30 on the axis A side, so that the contact surface 30 of the rod 10 is more likely to buckle. Further, as the ratio of the inner diameter L4 to the outer diameter L2 is higher, it is necessary to increase the outer diameter of the flange portion 23 in order to secure the contact area between the seat surface 22 and the contact surface 30 and make the contact surface 30 less likely to buckle. There is.

外径L2に対する内径L4の比率が100%に近い程、空間35の体積を十分に確保できずに座面22と接触面30との間に削り屑やバリが挟まれ易くなることがある。大径部33の軸方向長さL6を大きくして空間35の体積を確保しても、筒部24に接触面30が近いために接触面30上に削り屑が飛んだりして、座面22と接触面30との間に削り屑が挟まれ易くなるおそれがある。 When the ratio of the inner diameter L4 to the outer diameter L2 is close to 100%, the volume of the space 35 cannot be sufficiently secured, and shavings and burrs may be easily caught between the seat surface 22 and the contact surface 30. Even if the axial length L6 of the large diameter portion 33 is increased to secure the volume of the space 35, since the contact surface 30 is close to the tubular portion 24, shavings may fly onto the contact surface 30 and the seat surface. Shavings may be easily caught between the 22 and the contact surface 30.

外径L2に対する内径L4の比率を101~110%の範囲に設定することで、フランジ部23(ナット15)の大径化を抑えつつロッド10の接触面30を十分に座屈し難くできると共に、座面22と接触面30との間に削り屑やバリを十分に挟み難くできる。その結果、フランジ部23の大径化を抑えつつ、ナット15及びボルト14による軸力のばらつきをより小さくできる。 By setting the ratio of the inner diameter L4 to the outer diameter L2 in the range of 101 to 110%, it is possible to prevent the contact surface 30 of the rod 10 from buckling sufficiently while suppressing the increase in the diameter of the flange portion 23 (nut 15). It is possible to make it difficult for shavings and burrs to be sufficiently pinched between the seat surface 22 and the contact surface 30. As a result, the variation in the axial force due to the nut 15 and the bolt 14 can be further reduced while suppressing the increase in the diameter of the flange portion 23.

大径部33は圧入部32に対して軸直角方向に凹んだ部位である。なお、テーパ状に凹んだ部位を大径部としたり、テーパ状に凹んだ部位と軸直角方向に凹んだ部位とを組み合わせて大径部33を形成したりしても良い。しかし、これらの場合に比べて、大径部33が圧入部32に対して軸直角方向に凹んだ部位である方が、大径部33のうち接触面30に連なる部分の内径L4(大径部33の内径L4の最大値)や、大径部33のうち圧入部32に連なる部分の軸方向長さL6(大径部33の軸方向長さL6の最大値)を抑えつつ、空間35を大きくできる。これにより、座面22と接触面30との間に削り屑やバリをより挟み難くできるので、ナット15及びボルト14による軸力のばらつきをより小さくできる。 The large diameter portion 33 is a portion recessed in the direction perpendicular to the axis with respect to the press-fitting portion 32. The tapered portion may be a large diameter portion, or the tapered recessed portion and the concave portion in the direction perpendicular to the axis may be combined to form the large diameter portion 33. However, as compared with these cases, the portion where the large diameter portion 33 is recessed in the direction perpendicular to the axis with respect to the press-fitting portion 32 is the inner diameter L4 (large diameter) of the portion of the large diameter portion 33 connected to the contact surface 30. Space 35 while suppressing the axial length L6 (maximum value of the axial length L6 of the large diameter portion 33) of the portion of the large diameter portion 33 connected to the press-fitting portion 32) and the maximum value of the inner diameter L4 of the portion 33). Can be increased. As a result, it is possible to make it more difficult for shavings and burrs to be caught between the seat surface 22 and the contact surface 30, so that the variation in the axial force due to the nut 15 and the bolt 14 can be further reduced.

さらに、大径部33の内径L4の最大値を抑えることで、座面22と接触面30との接触面積を確保できる。その結果、ロッド10を座屈し難くできる。また、大径部33の軸方向長さL6の最大値を抑えることで、座面22からの筒部24の突出量を抑えることができる。その結果、ナット15の材料コストを低減できる。 Further, by suppressing the maximum value of the inner diameter L4 of the large diameter portion 33, the contact area between the seat surface 22 and the contact surface 30 can be secured. As a result, the rod 10 can be made difficult to buckle. Further, by suppressing the maximum value of the axial length L6 of the large diameter portion 33, the amount of protrusion of the tubular portion 24 from the seat surface 22 can be suppressed. As a result, the material cost of the nut 15 can be reduced.

歯部25には、圧入部32の内径L5よりも外径L1が小さい谷部27が設けられている。これにより、谷部27と貫通孔12(圧入部32や大径部33)との間にも空間が形成される。この空間にも圧入時の削り屑やバリ等を収容できるので、座面22と接触面30との間に削り屑やバリを十分に挟み難くしつつ、大径部33の内径L4や軸方向長さL6を抑えることができる。その結果、上述した通り、ナット15及びボルト14による軸力のばらつきをさらに小さくできると共に、座面22からの筒部24の突出量を抑えてナット15の材料コストを低減できる。 The tooth portion 25 is provided with a valley portion 27 having an outer diameter L1 smaller than the inner diameter L5 of the press-fitting portion 32. As a result, a space is also formed between the valley portion 27 and the through hole 12 (the press-fitting portion 32 and the large diameter portion 33). Since shavings and burrs at the time of press-fitting can be accommodated in this space as well, it is difficult to sufficiently pinch the shavings and burrs between the seat surface 22 and the contact surface 30, and the inner diameter L4 of the large diameter portion 33 and the axial direction. The length L6 can be suppressed. As a result, as described above, the variation in the axial force due to the nut 15 and the bolt 14 can be further reduced, and the amount of protrusion of the tubular portion 24 from the seat surface 22 can be suppressed to reduce the material cost of the nut 15.

特に、連結部26の軸方向長さL3よりも大径部33の軸方向長さL6が大きいので、谷部27によって、大径部33の内面とナット15との間の空間35を大きくできる。これにより、圧入部32と谷部27との間に圧入時の削り屑やバリ等を収容し難くできる。その結果、圧入部32と谷部27との間の削り屑やバリによって、圧入荷重が大きくなって圧入作業性が低下することを抑制できる。 In particular, since the axial length L6 of the large diameter portion 33 is larger than the axial length L3 of the connecting portion 26, the valley portion 27 can increase the space 35 between the inner surface of the large diameter portion 33 and the nut 15. .. As a result, it is possible to make it difficult to accommodate shavings, burrs, etc. at the time of press-fitting between the press-fitting portion 32 and the valley portion 27. As a result, it is possible to prevent the press-fitting load from becoming large and the press-fitting workability from deteriorating due to shavings and burrs between the press-fitting portion 32 and the valley portion 27.

なお、連結部26の外径を、頂部28の外径L2よりも小さくすることで、空間35を大きくできる。しかし、この場合には、歯部25や連結部26を形成し難くなり、ナット15が加工し難くなるため好ましくない。また、連結部26の外径を、頂部28の外径L2よりも大きくすることで、歯部25や連結部26の形成は容易になるが、空間35が小さくなるため好ましくない。これに対して本実施の形態では、連結部26の外径が頂部28の外径L2と略同一なので、空間35を小さくすることなく、歯部25や連結部26を形成し易くできる。 The space 35 can be increased by making the outer diameter of the connecting portion 26 smaller than the outer diameter L2 of the top portion 28. However, in this case, it becomes difficult to form the tooth portion 25 and the connecting portion 26, and it becomes difficult to process the nut 15, which is not preferable. Further, by making the outer diameter of the connecting portion 26 larger than the outer diameter L2 of the top portion 28, the formation of the tooth portion 25 and the connecting portion 26 becomes easy, but it is not preferable because the space 35 becomes small. On the other hand, in the present embodiment, since the outer diameter of the connecting portion 26 is substantially the same as the outer diameter L2 of the top portion 28, the tooth portion 25 and the connecting portion 26 can be easily formed without reducing the space 35.

ここで、フランジ部23を除く本体部21の外径が、大径部33の内径L4よりも小さい場合には、ナット15からロッド10に軸力が付与されたときに、フランジ部23の付け根に応力が集中し易くなる。そうすると、フランジ部23が変形したり、ロッド10が座屈し易くなったりして、ナット15及びボルト14による軸力のばらつきが大きくなるおそれがある。 Here, when the outer diameter of the main body portion 21 excluding the flange portion 23 is smaller than the inner diameter L4 of the large diameter portion 33, when the axial force is applied from the nut 15 to the rod 10, the root of the flange portion 23 is applied. Stress tends to concentrate on the flange. Then, the flange portion 23 may be deformed or the rod 10 may easily buckle, and the variation in the axial force due to the nut 15 and the bolt 14 may become large.

これに対して本実施の形態では、フランジ部23を除く本体部21の外径は、大径部33の内径L4よりも大きく設定される。これにより、フランジ部23の付け根に応力が集中することを防止でき、本体部21の全体でロッド10に軸力を付与することができる。その結果、ナット15及びボルト14による軸力のばらつきを小さくできる。 On the other hand, in the present embodiment, the outer diameter of the main body portion 21 excluding the flange portion 23 is set to be larger than the inner diameter L4 of the large diameter portion 33. As a result, it is possible to prevent stress from concentrating on the base of the flange portion 23, and it is possible to apply an axial force to the rod 10 as a whole of the main body portion 21. As a result, the variation in the axial force due to the nut 15 and the bolt 14 can be reduced.

小径部31の内径は、圧入部32の内径L5よりも小さく、ナット15のねじ山15aの谷径(ボルト14の軸部の外径)よりも大きく設定されている。これにより、圧入部32に圧入されるナット15のねじ山15aへ、小径部31によってボルト14を案内し易くできる。その結果、ナット15にボルト14を組み付け易くでき、締結作業性を向上できる。 The inner diameter of the small diameter portion 31 is set to be smaller than the inner diameter L5 of the press-fitting portion 32 and larger than the valley diameter of the thread 15a of the nut 15 (the outer diameter of the shaft portion of the bolt 14). As a result, the bolt 14 can be easily guided by the small diameter portion 31 to the thread 15a of the nut 15 that is press-fitted into the press-fitting portion 32. As a result, the bolt 14 can be easily assembled to the nut 15, and the fastening workability can be improved.

大径部33の内面のうち接触面30に連なる内面は、接触面30に垂直に設けられる。大径部33の内面のうち接触面30に連なる内面が、接触面30へ向かうにつれて拡径する場合には、締結構造体20の上下関係にもよるが、大径部33の内面のうち接触面30に連なる内面に沿って、空間35内の削り屑やバリが座面22と接触面30との間に案内され易くなる。 Of the inner surfaces of the large diameter portion 33, the inner surface connected to the contact surface 30 is provided perpendicular to the contact surface 30. When the inner surface of the inner surface of the large diameter portion 33 connected to the contact surface 30 expands in diameter toward the contact surface 30, the contact is made of the inner surface of the large diameter portion 33, although it depends on the vertical relationship of the fastening structure 20. Along the inner surface connected to the surface 30, shavings and burrs in the space 35 are easily guided between the seat surface 22 and the contact surface 30.

これに対して本実施の形態では、大径部33の内面のうち接触面30に連なる内面が接触面30に垂直に設けられるので、その内面に沿って、空間35内の削り屑やバリを座面22と接触面30との間に案内し難くできる。その結果、座面22と接触面30とを密着させ易くできるので、ナット15及びボルト14による軸力のばらつきを小さくできる。 On the other hand, in the present embodiment, since the inner surface of the inner surface of the large diameter portion 33 connected to the contact surface 30 is provided perpendicular to the contact surface 30, shavings and burrs in the space 35 are removed along the inner surface. It can be difficult to guide between the seat surface 22 and the contact surface 30. As a result, the seat surface 22 and the contact surface 30 can be easily brought into close contact with each other, so that the variation in the axial force due to the nut 15 and the bolt 14 can be reduced.

大径部33の内面のうち圧入部32に連なる内面は、圧入部32に垂直に設定される。大径部33の内面のうち圧入部32に連なる内面が圧入部32へ向かうにつれて縮径する場合には、締結構造体20の上下関係にもよるが、大径部33の内面のうち圧入部32に連なる内面に沿って、空間35内の削り屑やバリが歯部25と圧入部32との間に案内され易くなる。 Of the inner surfaces of the large diameter portion 33, the inner surface connected to the press-fitting portion 32 is set perpendicular to the press-fitting portion 32. When the inner surface of the inner surface of the large diameter portion 33 connected to the press-fitting portion 32 shrinks in diameter toward the press-fitting portion 32, the press-fitting portion of the inner surface of the large-diameter portion 33 depends on the vertical relationship of the fastening structure 20. Along the inner surface connected to 32, shavings and burrs in the space 35 are easily guided between the tooth portion 25 and the press-fitting portion 32.

これに対して本実施の形態では、大径部33の内面のうち圧入部32に連なる内面が圧入部32に垂直に設定されるので、その内面に沿って、空間35内の削り屑やバリを歯部25と圧入部32との間に案内し難くできる。その結果、歯部25と圧入部32との間の削り屑やバリによって圧入荷重が大きくなり、圧入作業性が低下することを抑制できる。 On the other hand, in the present embodiment, since the inner surface of the inner surface of the large diameter portion 33 connected to the press-fitting portion 32 is set perpendicular to the press-fitting portion 32, shavings and burrs in the space 35 are set along the inner surface thereof. Can be difficult to guide between the tooth portion 25 and the press-fitting portion 32. As a result, it is possible to prevent the press-fitting load from being increased due to shavings and burrs between the tooth portion 25 and the press-fitting portion 32, and the press-fitting workability from being lowered.

次に図4を参照して第2実施の形態について説明する。第1実施の形態では、ナット15(締結部材)がロッド10(固定部材)に圧入される締結構造体20について説明した。これに対し第2実施の形態では、ボルト41(締結部材)が板状の固定部材50に圧入される締結構造体40について説明する。なお、第1実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図4は第2実施の形態における締結構造体40の断面図である。 Next, a second embodiment will be described with reference to FIG. In the first embodiment, the fastening structure 20 in which the nut 15 (fastening member) is press-fitted into the rod 10 (fixing member) has been described. On the other hand, in the second embodiment, the fastening structure 40 in which the bolt 41 (fastening member) is press-fitted into the plate-shaped fixing member 50 will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and the following description will be omitted. FIG. 4 is a cross-sectional view of the fastening structure 40 in the second embodiment.

図4に示すように、締結構造体40は、ボルト41を板状の固定部材50の貫通孔51に圧入することで、固定部材50にボルト41が固定された部材である。締結構造体40は、固定部材50からボルト41の軸部46が突出している。この固定部材50から突出した軸部46に被締結部材(図示せず)を挿入し、軸部46のねじ山46a(おねじ)にナット(図示せず)を組み付けて、締結構造体40が使用される。固定部材50からボルト41の軸部46が突出しているので、固定部材50に対して被締結部材の位置決めを容易にできる。 As shown in FIG. 4, the fastening structure 40 is a member in which the bolt 41 is fixed to the fixing member 50 by press-fitting the bolt 41 into the through hole 51 of the plate-shaped fixing member 50. In the fastening structure 40, the shaft portion 46 of the bolt 41 projects from the fixing member 50. A member to be fastened (not shown) is inserted into the shaft portion 46 protruding from the fixing member 50, and a nut (not shown) is assembled to the thread 46a (male screw) of the shaft portion 46 to form a fastening structure 40. used. Since the shaft portion 46 of the bolt 41 protrudes from the fixing member 50, the fastening member can be easily positioned with respect to the fixing member 50.

ボルト41は、鋼製の部材である。ボルト41は、円柱状の頭部42と、頭部42の座面43から垂直に突出する軸部46と、頭部42の座面43から垂直に突出すると共に軸部46の周囲に一体成形される筒部45とを備える。頭部42には、座面43側から軸直角方向に張り出してフランジ部44が設けられる。フランジ部44によって、座面43の面積が広げられる。軸部46は、筒部45よりも先端側の外周面にねじ山46aが設けられる。 The bolt 41 is a steel member. The bolt 41 is integrally formed around the cylindrical head 42, the shaft portion 46 projecting vertically from the seat surface 43 of the head portion 42, and vertically projecting from the seat surface 43 of the head portion 42. It is provided with a cylinder portion 45 to be formed. The head 42 is provided with a flange portion 44 projecting from the seat surface 43 side in a direction perpendicular to the axis. The flange portion 44 increases the area of the seat surface 43. The shaft portion 46 is provided with a thread 46a on the outer peripheral surface on the distal end side of the tubular portion 45.

筒部45は、固定部材50の貫通孔51に挿入される部位である。筒部45の外周面は、筒部45の先端45a側の歯部25と、歯部25及び座面43を連結する連結部26とを備える。歯部25は、貫通孔51に圧入される部位である。歯部25には、先端45a側を面取り形成した面取部45bが設けられる。この面取部45bによって、歯部25を貫通孔51に圧入するときの圧入荷重を抑制できる共に、歯部25を貫通孔51の所望の位置に案内できる。 The tubular portion 45 is a portion to be inserted into the through hole 51 of the fixing member 50. The outer peripheral surface of the tubular portion 45 includes a tooth portion 25 on the tip 45a side of the tubular portion 45, and a connecting portion 26 connecting the tooth portion 25 and the seat surface 43. The tooth portion 25 is a portion that is press-fitted into the through hole 51. The tooth portion 25 is provided with a chamfered portion 45b formed by chamfering the tip 45a side. The chamfered portion 45b can suppress the press-fitting load when the tooth portion 25 is press-fitted into the through hole 51, and can guide the tooth portion 25 to a desired position of the through-hole 51.

固定部材50は、ボルト41よりも低硬度のアルミニウム合金製の板材である。固定部材50には、板厚方向に貫通して貫通孔51が形成されている。固定部材50は、貫通孔51の一端が開口している一端面(図4(b)紙面上側の面)が接触面30である。この接触面30は、ボルト41の筒部45を貫通孔51に挿入したときに、ボルト41の座面43が接触する部位である。 The fixing member 50 is a plate material made of an aluminum alloy having a hardness lower than that of the bolt 41. The fixing member 50 is formed with a through hole 51 penetrating in the plate thickness direction. In the fixing member 50, one end surface (the surface on the upper side of the paper surface in FIG. 4B) where one end of the through hole 51 is open is the contact surface 30. The contact surface 30 is a portion where the seat surface 43 of the bolt 41 comes into contact when the tubular portion 45 of the bolt 41 is inserted into the through hole 51.

固定部材50の貫通孔51の内面は、接触面30へ向かって順に小径部31、圧入部32、大径部52を有している。圧入部32は、ボルト41の筒部45(歯部25)が圧入される部位である。 The inner surface of the through hole 51 of the fixing member 50 has a small diameter portion 31, a press-fitting portion 32, and a large diameter portion 52 in this order toward the contact surface 30. The press-fitting portion 32 is a portion where the tubular portion 45 (tooth portion 25) of the bolt 41 is press-fitted.

大径部52は、圧入部32と接触面30とを連結する部位である。大径部52は、圧入部32から接触面30へ向かうにつれてテーパ状に拡径される。接触面30に連なる部分における大径部52の内径L7(大径部52の内径の最大値)は、圧入部32の内径L5、及び、頂部28や連結部26の外径L2よりも大きく設定されている。大径部52のうち圧入部32に連なる部分の軸方向長さL8(大径部52の軸方向長さの最大値)は、連結部26の軸方向長さL3よりも大きく設定されている。 The large diameter portion 52 is a portion that connects the press-fitting portion 32 and the contact surface 30. The large diameter portion 52 is tapered in diameter from the press-fitting portion 32 toward the contact surface 30. The inner diameter L7 of the large diameter portion 52 (the maximum value of the inner diameter of the large diameter portion 52) in the portion connected to the contact surface 30 is set to be larger than the inner diameter L5 of the press-fitting portion 32 and the outer diameter L2 of the top portion 28 and the connecting portion 26. Has been done. The axial length L8 (maximum value of the axial length of the large diameter portion 52) of the portion of the large diameter portion 52 connected to the press-fitting portion 32 is set to be larger than the axial length L3 of the connecting portion 26. ..

なお、このように、大径部52の内径や軸方向長さが一様ではない場合、本明細書では、大径部52のうち接触面30に連なる部分の内径を大径部52の内径L7とし、大径部52のうち圧入部32に連なる部分の軸方向長さを大径部52の軸方向長さL8として説明する。 When the inner diameter and the axial length of the large diameter portion 52 are not uniform as described above, in the present specification, the inner diameter of the portion of the large diameter portion 52 connected to the contact surface 30 is the inner diameter of the large diameter portion 52. Let L7 be used, and the axial length of the portion of the large-diameter portion 52 connected to the press-fitting portion 32 will be described as the axial length L8 of the large-diameter portion 52.

締結構造体40は、ボルト41の座面43が固定部材50の接触面30に接触するまで、ボルト41の筒部45が固定部材50の圧入部32に圧入される。このように、圧入によって固定部材50にボルト41を固定することで、固定部材50とボルト41とを別々に管理しなくて良いので、部品管理を簡便にできる。 In the fastening structure 40, the tubular portion 45 of the bolt 41 is press-fitted into the press-fitting portion 32 of the fixing member 50 until the seat surface 43 of the bolt 41 comes into contact with the contact surface 30 of the fixing member 50. By fixing the bolt 41 to the fixing member 50 by press fitting in this way, it is not necessary to manage the fixing member 50 and the bolt 41 separately, so that the parts management can be simplified.

なお、固定部材50がアルミニウム合金製なので、固定部材50から軸部46を突出形成するのは、軸部46の強度を十分に確保できないことがあり好ましくない。また、固定部材50がアルミニウム合金製なので、ボルト41を固定部材50に溶接することが難しい。そのため、圧入によって固定部材50にボルト41を固定することが好ましい。 Since the fixing member 50 is made of an aluminum alloy, it is not preferable to form the shaft portion 46 protruding from the fixing member 50 because the strength of the shaft portion 46 cannot be sufficiently secured. Further, since the fixing member 50 is made of an aluminum alloy, it is difficult to weld the bolt 41 to the fixing member 50. Therefore, it is preferable to fix the bolt 41 to the fixing member 50 by press fitting.

第2実施の形態における締結構造体40によれば、第1実施の形態と同様に、圧入部32と接触面30との間に、筒部45の最大の外径L2(歯部25の頂部28の外径L2や連結部26の外径L2)よりも、内径L7が大きい大径部52が設けられている。これにより、座面43よりも先端45a側であって、大径部52の内面とボルト41との間に空間55が形成される。この空間55に、圧入時の削り屑やバリを収容できるので、座面43と接触面30との間に削り屑やバリを挟み難くできる。その結果、座面43と接触面30とを密着させ易くできるので、ボルト41による軸力のばらつきを小さくできる。 According to the fastening structure 40 in the second embodiment, the maximum outer diameter L2 of the tubular portion 45 (the top of the tooth portion 25) is located between the press-fitting portion 32 and the contact surface 30 as in the first embodiment. A large diameter portion 52 having an inner diameter L7 larger than the outer diameter L2 of the 28 and the outer diameter L2) of the connecting portion 26 is provided. As a result, a space 55 is formed between the inner surface of the large diameter portion 52 and the bolt 41 on the tip 45a side of the seat surface 43. Since the shavings and burrs at the time of press-fitting can be stored in this space 55, it is possible to prevent the shavings and burrs from being caught between the seat surface 43 and the contact surface 30. As a result, the seat surface 43 and the contact surface 30 can be easily brought into close contact with each other, so that the variation in the axial force due to the bolt 41 can be reduced.

大径部52が接触面30へ向かうにつれてテーパ状に拡径される部位なので、大径部52によって筒部45を圧入部32に案内できる。その結果、圧入部32への筒部45の圧入作業性を向上できる。 Since the large diameter portion 52 is a portion whose diameter is expanded in a tapered shape toward the contact surface 30, the large diameter portion 52 can guide the tubular portion 45 to the press-fitting portion 32. As a result, the press-fitting workability of the tubular portion 45 into the press-fitting portion 32 can be improved.

さらに、大径部52が接触面30へ向かうにつれてテーパ状に拡径される部位なので、接触面30を上方へ向けながら圧入部32に筒部45を圧入することで、圧入時の削り屑を圧入部32と歯部25との間へ向かって大径部52に沿って案内できる。その結果、圧入部32と谷部27との間から下方へ削り屑を排出できるので、座面43と接触面30との間に削り屑やバリを挟み難くできる。よって、座面43と接触面30とを密着させ易くできるので、ボルト41による軸力のばらつきを小さくできる。 Further, since the large diameter portion 52 is a portion whose diameter is expanded in a tapered shape toward the contact surface 30, the cylinder portion 45 is press-fitted into the press-fitting portion 32 while the contact surface 30 is directed upward to remove shavings at the time of press-fitting. It can be guided along the large diameter portion 52 toward the press-fitting portion 32 and the tooth portion 25. As a result, since the shavings can be discharged downward from between the press-fitting portion 32 and the valley portion 27, it is possible to prevent shavings and burrs from being caught between the seat surface 43 and the contact surface 30. Therefore, since the seat surface 43 and the contact surface 30 can be easily brought into close contact with each other, the variation in the axial force due to the bolt 41 can be reduced.

連結部26の軸方向長さL3よりも大径部52の軸方向長さL8が大きいので、圧入部32に連結部26が圧入されることを防止できる。その結果、貫通孔51への連結部26の圧入に起因した圧入荷重の増大を防止できるので、締結構造体40の製造を容易にできる。 Since the axial length L8 of the large diameter portion 52 is larger than the axial length L3 of the connecting portion 26, it is possible to prevent the connecting portion 26 from being press-fitted into the press-fitting portion 32. As a result, it is possible to prevent an increase in the press-fitting load due to the press-fitting of the connecting portion 26 into the through hole 51, so that the fastening structure 40 can be easily manufactured.

なお、大径部52が接触面30へ向かうにつれてテーパ状に拡径される場合、連結部26の軸方向長さL3よりも大径部52の軸方向長さL8(大径部52のうち圧入部32に連なる部分の軸方向長さL8)が大きくても、大径部52の内面に、谷部27と連結部26とを軸方向に連結する傾斜面29が接触することがある。この接触によって、圧入部32への歯部25の圧入荷重が増大する。 When the diameter of the large diameter portion 52 is expanded in a tapered shape toward the contact surface 30, the axial length L8 of the large diameter portion 52 (of the large diameter portion 52) is larger than the axial length L3 of the connecting portion 26. Even if the axial length L8) of the portion connected to the press-fitting portion 32 is large, the inclined surface 29 that axially connects the valley portion 27 and the connecting portion 26 may come into contact with the inner surface of the large diameter portion 52. By this contact, the press-fitting load of the tooth portion 25 on the press-fitting portion 32 increases.

しかし、本実施の形態では、外径が連結部26へ向かうにつれてテーパ状に拡径される傾斜面29が、大径部52の内面に接触しないように設定されている。これにより、大径部52が接触面30へ向かうにつれてテーパ状に拡径される部位であっても、大径部52の内面と傾斜面29との接触に起因して圧入荷重が増大することを防止できる。 However, in the present embodiment, the inclined surface 29 whose outer diameter is tapered toward the connecting portion 26 is set so as not to come into contact with the inner surface of the large diameter portion 52. As a result, even in a portion where the diameter of the large diameter portion 52 is expanded in a tapered shape toward the contact surface 30, the press-fitting load increases due to the contact between the inner surface of the large diameter portion 52 and the inclined surface 29. Can be prevented.

以上、上記実施の形態に基づき本発明を説明したが、本発明は上記形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の変形改良が可能であることは容易に推察できるものである。例えば、ナット15やボルト41、貫通孔12,51の各部形状を適宜変更しても良い。フランジ部23,44や小径部31を省略しても良い。また、歯部25の谷部27及び頂部28を省略して、歯部の軸直角断面を円形状に形成しても良い。この場合、ナット15の本体部21の軸直角断面を六角形状に形成したり、ボルト41の頭部42を六角柱状に形成したりして、ナット15やボルト41に対してそれぞれボルト14やナットを組み付けるときに、ナット15やボルト41の回転を規制できるようにすることが好ましい。 Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the above-mentioned embodiment, and it is easy that various modifications and improvements can be made without departing from the spirit of the present invention. It can be inferred from. For example, the shapes of the nuts 15, the bolts 41, and the through holes 12, 51 may be appropriately changed. The flange portions 23, 44 and the small diameter portion 31 may be omitted. Further, the valley portion 27 and the top portion 28 of the tooth portion 25 may be omitted, and the cross section perpendicular to the axis of the tooth portion may be formed in a circular shape. In this case, the cross section perpendicular to the axis of the main body 21 of the nut 15 is formed into a hexagonal shape, or the head 42 of the bolt 41 is formed into a hexagonal columnar shape so that the bolt 14 and the nut can be attached to the nut 15 and the bolt 41, respectively. It is preferable to be able to regulate the rotation of the nut 15 and the bolt 41 when assembling.

上記第1実施の形態ではナット15をロッド10(固定部材)に圧入固定した締結構造体20がトルクロッド1の一部である場合について説明したが、必ずしもこれに限られるものではない。ナット15やボルト41が使用される種々の物品の一部を締結構造体20,40とすることが可能である。 In the first embodiment, the case where the fastening structure 20 in which the nut 15 is press-fitted and fixed to the rod 10 (fixing member) is a part of the torque rod 1 has been described, but the present invention is not limited to this. Some of the various articles in which the nuts 15 and bolts 41 are used can be the fastening structures 20, 40.

なお、第1実施の形態のように、一体成形される一対のロッド10,11間に第2ブッシュ6を挟んだ状態で、ロッド11の貫通孔13、第2ブッシュ6の内側部材8の内周、ロッド10の貫通孔12にボルト14を通すトルクロッド1では、ボルト41ではなく、ナット15をロッド10に圧入固定することが好ましい。ボルト41をロッド10に圧入固定するには、事前にロッド10,11間に第2ブッシュ6を挟む必要があるので、ボルト41をロッド10に予め圧入固定しておく利点が少なくなるためである。 In addition, as in the first embodiment, in a state where the second bush 6 is sandwiched between the pair of rods 10 and 11 integrally formed, the through hole 13 of the rod 11 and the inner member 8 of the second bush 6 are included. In the torque rod 1 in which the bolt 14 is passed through the through hole 12 of the rod 10 around the circumference, it is preferable that the nut 15 is press-fitted and fixed to the rod 10 instead of the bolt 41. In order to press-fit and fix the bolt 41 to the rod 10, it is necessary to sandwich the second bush 6 between the rods 10 and 11 in advance, so that the advantage of press-fitting and fixing the bolt 41 to the rod 10 in advance is reduced. ..

上記各実施の形態では、ロッド10や固定部材50がアルミニウム合金製である場合について説明したが、必ずしもこれに限られるものではない。ナット15やボルト41に対して低硬度であれば、ロッド10や固定部材50の素材は適宜変更可能である。ロッド10や固定部材50の素材としては、例えば、マグネシウム合金などアルミニウム合金以外の金属や、合成樹脂が挙げられる。 In each of the above embodiments, the case where the rod 10 and the fixing member 50 are made of an aluminum alloy has been described, but the present invention is not limited to this. The material of the rod 10 and the fixing member 50 can be appropriately changed as long as the hardness is lower than that of the nut 15 and the bolt 41. Examples of the material of the rod 10 and the fixing member 50 include metals other than aluminum alloys such as magnesium alloys and synthetic resins.

なお、ロッド10や固定部材50全体をナット15やボルト41に対して低硬度にする場合に限らない。少なくともロッド10や固定部材50の貫通孔12,51の内面が、ナット15やボルト41に対して低硬度であれば良い。 The hardness of the rod 10 and the fixing member 50 as a whole is not limited to the case where the hardness is lower than that of the nut 15 and the bolt 41. At least the inner surfaces of the through holes 12, 51 of the rod 10 and the fixing member 50 may have a low hardness with respect to the nut 15 and the bolt 41.

上記第1実施の形態では、大径部33が圧入部32に対して軸直角方向へ段差状に凹んで設けられる場合について説明した。上記第2実施の形態では、大径部52が接触面30へ向かうにつれてテーパ状に拡径される場合について説明した。しかし、必ずしもこれに限られるものではない。例えば、大径部を接触面30へ向かうにつれて湾曲するように拡径させても良い。また、段差状に凹んだ部分と、接触面30へ向かうにつれて拡径する部分とを組み合わせても良い。 In the first embodiment, the case where the large diameter portion 33 is provided so as to be recessed in a stepped shape in the direction perpendicular to the axis with respect to the press-fitting portion 32 has been described. In the second embodiment, the case where the large diameter portion 52 is tapered toward the contact surface 30 has been described. However, it is not always limited to this. For example, the diameter of the large diameter portion may be increased so as to be curved toward the contact surface 30. Further, a portion recessed in a stepped shape and a portion whose diameter increases toward the contact surface 30 may be combined.

上記各実施の形態では、ナット15やボルト41にフランジ部23,44が設けられる場合について説明したが、必ずしもこれに限られるものではない。ナット15やボルト41のフランジ部23,44を省略しても良い。この場合には、ナット15の本体部21やボルト41の頭部42を大きくして、座面22,43を大きくする必要がある。 In each of the above embodiments, the case where the flange portions 23 and 44 are provided on the nut 15 and the bolt 41 has been described, but the present invention is not limited to this. The flange portions 23 and 44 of the nut 15 and the bolt 41 may be omitted. In this case, it is necessary to increase the size of the main body 21 of the nut 15 and the head portion 42 of the bolt 41 to increase the seat surfaces 22 and 43.

10 ロッド(固定部材)
11 ロッド
12,51 貫通孔
13 貫通孔(挿入孔)
15 ナット(締結部材)
15a,46a ねじ山
20,40 締結構造体
21 本体部(座面形成部)
22 ,43座面
23,44 フランジ部
24,45 筒部
25 歯部
26 連結部
27 谷部
28 頂部
30 接触面
31 小径部
32 圧入部
33,52 大径部
35,55 空間
41 ボルト(締結部材)
42 頭部(座面形成部)
50 固定部材
10 Rod (fixing member)
11 rod
12,51 through hole
13 Through hole (insertion hole)
15 Nut (fastening member)
15a, 46a Thread 20,40 Fastening structure
21 Main body (seat forming part)
22 and 43 seats
23,44 Flange part
24,45 Cylindrical part 25 Tooth part 26 Connecting part 27 Tani part 28 Top part 30 Contact surface
31 Small diameter part
32 Press-fitting part 33,52 Large diameter part 35,55 Space 41 Bolt (fastening member)
42 Head (seat surface forming part)
50 Fixing member

Claims (5)

相手部材が組み付けられるねじ山と、座面から垂直に突出する筒部とを有する締結部材と、
前記筒部が軸方向へ挿入される貫通孔が貫通形成されると共に、少なくとも前記貫通孔の内面が前記締結部材に比べて低硬度の固定部材とを備え、
前記貫通孔の前記内面は、前記筒部が圧入される圧入部と、
前記座面が接触する前記固定部材の接触面と前記圧入部とを連結すると共に、前記筒部のうち前記圧入部に圧入される部分の外径と比べて内径が大きい大径部とを備え
前記筒部の外周面は、前記圧入部の内径よりも外径が小さい谷部と、前記圧入部の内径よりも外径が大きい頂部と、が周方向に交互に配置される歯部と、
前記歯部と前記座面とを連結すると共に、軸直角断面が円形状の連結部と、を備え、
前記連結部の外径は、前記歯部の前記頂部の外径と同一であって、前記圧入部の内径よりも大きく、前記大径部の内径よりも小さく設定されることを特徴とする締結構造体。
A fastening member having a thread for assembling the mating member and a tubular portion that protrudes vertically from the seat surface.
A through hole into which the tubular portion is inserted in the axial direction is formed through, and at least the inner surface of the through hole is provided with a fixing member having a hardness lower than that of the fastening member.
The inner surface of the through hole includes a press-fitting portion into which the tubular portion is press-fitted and a press-fitting portion.
The contact surface of the fixing member with which the seat surface is in contact is connected to the press-fitting portion, and a large-diameter portion having an inner diameter larger than the outer diameter of the portion of the tubular portion to be press-fitted into the press-fitting portion is provided. ,
The outer peripheral surface of the tubular portion includes a tooth portion in which a valley portion having an outer diameter smaller than the inner diameter of the press-fitting portion and a top portion having an outer diameter larger than the inner diameter of the press-fitting portion are alternately arranged in the circumferential direction.
The tooth portion and the seat surface are connected to each other, and a connecting portion having a circular cross section perpendicular to the axis is provided.
The outer diameter of the connecting portion is the same as the outer diameter of the top portion of the tooth portion, and is set to be larger than the inner diameter of the press-fitting portion and smaller than the inner diameter of the large diameter portion. Structure.
前記締結部材は、軸方向の一端面に前記座面を形成する座面形成部と、
前記座面形成部の軸方向の一部から軸直角方向に張り出して前記座面を延長するフランジ部と、を備え、
前記フランジ部を除く前記座面形成部の外径が前記大径部の外径よりも大きいことを特徴とする請求項1記載の締結構造体。
The fastening member includes a seat surface forming portion that forms the seat surface on one end surface in the axial direction, and a seat surface forming portion.
A flange portion that projects from a part of the seat surface forming portion in the axial direction in a direction perpendicular to the axis and extends the seat surface is provided.
The fastening structure according to claim 1 , wherein the outer diameter of the seat surface forming portion excluding the flange portion is larger than the outer diameter of the large diameter portion .
前記締結部材は、前記相手部材としてのボルトがめねじによる前記ねじ山に組み付けられるナットであり、
前記貫通孔の内面は、前記圧入部に対し前記接触面とは反対側に位置する小径部を備え、
前記小径部の内径は、前記圧入部の内径よりも小さく、前記ナットのねじ山の谷径よりも大きいことを特徴とする請求項1又は2に記載の締結構造体。
The fastening member is a nut in which a bolt as a mating member is attached to the thread by a female screw.
The inner surface of the through hole is provided with a small diameter portion located on the side opposite to the contact surface with respect to the press-fitting portion.
The fastening structure according to claim 1 or 2 , wherein the inner diameter of the small diameter portion is smaller than the inner diameter of the press-fitting portion and larger than the valley diameter of the thread of the nut .
前記締結部材は、前記相手部材としてのボルトがめねじによる前記ねじ山に組み付けられるナットであり、
前記締結構造体は、前記固定部材に対し前記接触面とは反対側に間隔を空けて配置されるロッドを備え、
前記ロッドは、前記固定部材と一体成形され、前記固定部材の前記貫通孔に挿入されたボルトが挿入可能な位置に挿入孔が形成されていることを特徴とする請求項1から3のいずれかに記載の締結構造体。
The fastening member is a nut in which a bolt as a mating member is attached to the thread by a female screw.
The fastening structure comprises rods spaced apart from the contact surface with respect to the fixing member.
One of claims 1 to 3 , wherein the rod is integrally molded with the fixing member, and an insertion hole is formed at a position where a bolt inserted into the through hole of the fixing member can be inserted . The fastening structure described in.
前記連結部の軸方向長さは、前記大径部の軸方向長さ以下に設定されることを特徴とする請求項1から4のいずれかに記載の締結構造体。 The fastening structure according to any one of claims 1 to 4 , wherein the axial length of the connecting portion is set to be equal to or smaller than the axial length of the large diameter portion.
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JP2003213973A (en) 2002-01-21 2003-07-30 Sakae Riken Kogyo Co Ltd Plastic molding body having insert metal fitting
JP2007321787A (en) 2006-05-30 2007-12-13 Bosch Corp Stud bolt and booster using the same
JP2011038586A (en) 2009-08-10 2011-02-24 Ud Trucks Corp Bolt retaining structure
JP2011131716A (en) 2009-12-24 2011-07-07 Ntn Corp Bearing device for wheel
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