JP6805988B2 - Resin molded body - Google Patents

Resin molded body Download PDF

Info

Publication number
JP6805988B2
JP6805988B2 JP2017135014A JP2017135014A JP6805988B2 JP 6805988 B2 JP6805988 B2 JP 6805988B2 JP 2017135014 A JP2017135014 A JP 2017135014A JP 2017135014 A JP2017135014 A JP 2017135014A JP 6805988 B2 JP6805988 B2 JP 6805988B2
Authority
JP
Japan
Prior art keywords
contact
collar
resin molded
circumferential direction
weld
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2017135014A
Other languages
Japanese (ja)
Other versions
JP2019015382A (en
Inventor
信弥 酒井
信弥 酒井
佳昭 間瀬
佳昭 間瀬
健太郎 榎本
健太郎 榎本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyoda Gosei Co Ltd
Original Assignee
Toyoda Gosei Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyoda Gosei Co Ltd filed Critical Toyoda Gosei Co Ltd
Priority to JP2017135014A priority Critical patent/JP6805988B2/en
Publication of JP2019015382A publication Critical patent/JP2019015382A/en
Application granted granted Critical
Publication of JP6805988B2 publication Critical patent/JP6805988B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

本発明は、円筒状のカラーが嵌合される取付孔を有する樹脂成形体に関する。 The present invention relates to a resin molded body having a mounting hole into which a cylindrical collar is fitted.

従来、円筒状のカラーが嵌合される取付孔を有する樹脂成形体が知られている(例えば、特許文献1)。この樹脂成形体は、取付孔に嵌合されたカラーに挿入されたボルトを用いて他部材に締結される。この樹脂成形体の取付孔は、略楕円形状に形成されており、カラーは、その樹脂成形体の取付孔に対して締め代が周方向に不均一となるように嵌合されている。この構造によれば、カラーの取付孔に対する締め代の最大が、共に真円形の取付孔及びカラーでの締め代と同じであっても、全接触圧を低減することができる。 Conventionally, a resin molded body having a mounting hole into which a cylindrical collar is fitted is known (for example, Patent Document 1). This resin molded body is fastened to another member using bolts inserted into the collar fitted in the mounting holes. The mounting holes of the resin molded body are formed in a substantially elliptical shape, and the collar is fitted so that the tightening margin is non-uniform in the circumferential direction with respect to the mounting holes of the resin molded body. According to this structure, the total contact pressure can be reduced even if the maximum tightening allowance for the collar mounting hole is the same as the tightening allowance for both the perfect circular mounting hole and the collar.

特開2016−223571号公報Japanese Unexamined Patent Publication No. 2016-223571

しかしながら、取付孔に対するカラーの締め代の管理は困難であるので、取付孔へのカラーの嵌合時やボルトの締結時に樹脂成形体に大きな力が加わる可能性がある。一方、樹脂成形体では、成形の過程で取付孔周囲の周縁部に樹脂が合流するウェルド部が形成される。このウェルド部は、取付孔と樹脂成形体の外面とを結ぶように取付孔から径方向外側へ延びる、他部位に比べて剛性の低い部位である。このため、樹脂成形体のウェルド部を挟んだ両側部位それぞれに大きさ或いは方向の異なる力が加わると、それらの両側部位に径方向或いは周方向に相対的にずれる方向に力が作用しウェルド部が破断し易くなる。このウェルド部の破断は、特に伸び難く弾性率の高い樹脂が用いられた樹脂成形体で顕著に生じる。 However, since it is difficult to control the tightening allowance of the collar on the mounting hole, a large force may be applied to the resin molded body when the collar is fitted into the mounting hole or when the bolt is fastened. On the other hand, in the resin molded body, a weld portion where the resin joins is formed at the peripheral edge portion around the mounting hole in the molding process. This weld portion extends radially outward from the mounting hole so as to connect the mounting hole and the outer surface of the resin molded body, and is a portion having lower rigidity than other portions. For this reason, when a force having a different size or direction is applied to both side portions of the resin molded body sandwiching the weld portion, a force acts on both side portions in a direction that is relatively displaced in the radial direction or the circumferential direction, and the weld portion. Is easy to break. This breakage of the weld portion occurs remarkably in a resin molded body in which a resin that is hard to stretch and has a high elastic modulus is used.

上記した特許文献1記載の樹脂成形体では、カラーの取付孔に対する締め代が周方向に不均一とされるものであるので、締め代の大小の位置によっては、ウェルド部を挟んだ両側部位に大きさや方向の異なる力が作用して、ウェルド部が破断する可能性は依然として高い。 In the resin molded product described in Patent Document 1 described above, the tightening allowance for the collar mounting hole is non-uniform in the circumferential direction. Therefore, depending on the position of the tightening allowance, it may be located on both sides of the weld portion. There is still a high possibility that the weld will break due to the action of forces of different magnitudes and directions.

本発明は、このような点に鑑みてなされたものであり、ウェルド部の破断を抑えることが可能な樹脂成形体を提供することを目的とする。 The present invention has been made in view of such a point, and an object of the present invention is to provide a resin molded product capable of suppressing breakage of a weld portion.

本発明は、円筒状のカラーが嵌合される取付孔と、前記取付孔の周囲に形成される周縁部と、を備える樹脂成形体であって、前記周縁部は、成形時における樹脂の合流により形成されるウェルド部と、仮想円柱の側面に沿う円弧面が形成され、前記カラーの外筒面に対して非接触である非接触円弧部と、前記非接触円弧部の前記円弧面に対して前記仮想円柱の軸心側へ突出し、前記カラーの外筒面に接触する接触突出部と、を有し、前記ウェルド部は、前記周縁部のうち前記接触突出部が形成された対応領域に設けられている、樹脂成形体である。 The present invention is a resin molded body including a mounting hole into which a cylindrical collar is fitted and a peripheral edge portion formed around the mounting hole, and the peripheral edge portion is a confluence of resins during molding. A non-contact arc portion formed by the above and an arc surface along the side surface of the virtual cylinder, which is non-contact with the outer cylinder surface of the collar, and the arc surface of the non-contact arc portion. It has a contact projecting portion that protrudes toward the axial center of the virtual cylinder and contacts the outer cylinder surface of the collar, and the weld portion is located in a corresponding region of the peripheral edge portion where the contact projecting portion is formed. It is a resin molded body provided.

この構成によれば、ウェルド部が、取付孔周囲の周縁部のうちカラーの外筒面に接触する接触突出部が形成された対応領域に設けられる。この構造では、ウェルド部に作用するそのウェルド部を周方向に挟んだ両側部位同士を周方向や径方向に引き離す力は小さく或いは略ゼロになり、それらの両側部位が径方向に相対的にずれる変形及び周方向に相対的にずれる変形の双方が生じるのは抑制される。従って、樹脂成形体によれば、周縁部のウェルド部における伸び変形或いは歪み変形を低減させることができるので、そのウェルド部の破断を抑えることができる。 According to this configuration, the weld portion is provided in the corresponding region of the peripheral edge portion around the mounting hole where the contact protrusion portion that contacts the outer cylinder surface of the collar is formed. In this structure, the force that separates both side parts that act on the weld part in the circumferential direction from each other in the circumferential direction and the radial direction becomes small or substantially zero, and the both side parts are relatively displaced in the radial direction. Both deformation and deformation that is relatively displaced in the circumferential direction are suppressed. Therefore, according to the resin molded body, it is possible to reduce the elongation deformation or the strain deformation in the weld portion of the peripheral portion, so that the breakage of the weld portion can be suppressed.

本発明の第1実施形態に係る樹脂成形体をボルトにより締結対象部材に締結した状態を表した断面図である。It is sectional drawing which showed the state in which the resin molded body which concerns on 1st Embodiment of this invention is fastened to a member to be fastened by a bolt. 第1実施形態の樹脂成形体を取付孔の外方から見た部分平面図である。It is a partial plan view which looked at the resin molded body of 1st Embodiment from the outside of a mounting hole. 第1実施形態の樹脂成形体の部分斜視図である。It is a partial perspective view of the resin molded article of 1st Embodiment. 第1実施形態の樹脂成形体においてカラーの接触圧が作用する状態を模式的に表した図である。It is a figure which represented typically the state in which the contact pressure of a collar acts in the resin molded article of 1st Embodiment. 第1実施形態の変形形態に係る樹脂成形体において取付孔の形状を説明するための図である。It is a figure for demonstrating the shape of the mounting hole in the resin molded body which concerns on the modified form of 1st Embodiment. 本発明の第2実施形態に係る樹脂成形体において取付孔の形状を説明するための図である。It is a figure for demonstrating the shape of the attachment hole in the resin molded body which concerns on 2nd Embodiment of this invention. 第2実施形態の一変形形態に係る樹脂成形体において取付孔の形状を説明するための図である。It is a figure for demonstrating the shape of the mounting hole in the resin molded body which concerns on one modification of 2nd Embodiment. 第2実施形態の他の変形形態に係る樹脂成形体において取付孔の形状を説明するための図である。It is a figure for demonstrating the shape of the attachment hole in the resin molded body which concerns on other modified forms of 2nd Embodiment.

以下、本発明に係る樹脂成形体の具体的な実施形態について図面を用いて説明する。 Hereinafter, specific embodiments of the resin molded product according to the present invention will be described with reference to the drawings.

[第1実施形態]
図1−図4を用いて、第1実施形態の樹脂成形体1について説明する。
樹脂成形体1は、射出成形によって溶融樹脂を金型に流し込んで形成される部材である。樹脂成形体1は、溶融樹脂にグラスファイバー等の強化繊維が混入された繊維強化樹脂により形成されたものである。樹脂成形体1は、例えばエンジン用パーツやターボダクトなどに用いられる。樹脂成形体1は、図1に示す如く、ボルト4を用いて締結対象部材2に締結される。この締結対象部材2は、例えば金属製のシリンダブロックなどの他部材である。
[First Embodiment]
The resin molded product 1 of the first embodiment will be described with reference to FIGS. 1 to 4.
The resin molded body 1 is a member formed by pouring molten resin into a mold by injection molding. The resin molded body 1 is formed of a fiber-reinforced resin in which reinforcing fibers such as glass fibers are mixed with molten resin. The resin molded body 1 is used, for example, for engine parts, turbo ducts, and the like. As shown in FIG. 1, the resin molded body 1 is fastened to the fastening target member 2 using bolts 4. The fastening target member 2 is another member such as a metal cylinder block.

樹脂成形体1は、締結対象部材2に対する取付部としてのフランジ部10を有している。フランジ部10は、平面板状に形成された部位である。フランジ部10は、所定厚さを有している。フランジ部10には、ボルト締結用の取付孔11が形成されている。すなわち、樹脂成形体1は、取付孔11を備えている。取付孔11は、図2に示す如く、フランジ部10を貫通する孔であって、断面略円形に形成されている。尚、取付孔11の形状は、後に詳述する。取付孔11の周囲には、周縁部12が形成されている。すなわち、樹脂成形体1は、取付孔11の周囲に環状に形成された周縁部12を備えている。 The resin molded body 1 has a flange portion 10 as a mounting portion for the member to be fastened 2. The flange portion 10 is a portion formed in the shape of a flat plate. The flange portion 10 has a predetermined thickness. A mounting hole 11 for fastening a bolt is formed in the flange portion 10. That is, the resin molded body 1 includes a mounting hole 11. As shown in FIG. 2, the mounting hole 11 is a hole that penetrates the flange portion 10 and is formed to have a substantially circular cross section. The shape of the mounting hole 11 will be described in detail later. A peripheral edge portion 12 is formed around the mounting hole 11. That is, the resin molded body 1 includes a peripheral edge portion 12 formed in an annular shape around the mounting hole 11.

取付孔11には、カラー3が挿入されている。カラー3は、円筒状に形成された金属製の部材である。カラー3は、断面円形に形成されている。カラー3は、取付孔11の径に対応した外径を有していると共に、取付孔11の軸方向の長さに対応した軸方向の長さを有している。カラー3は、取付孔11に圧入され或いは焼嵌めされることにより嵌合される。 The collar 3 is inserted into the mounting hole 11. The collar 3 is a metal member formed in a cylindrical shape. The collar 3 has a circular cross section. The collar 3 has an outer diameter corresponding to the diameter of the mounting hole 11, and also has an axial length corresponding to the axial length of the mounting hole 11. The collar 3 is fitted by being press-fitted or shrink-fitted into the mounting hole 11.

カラー3の径方向内側には、ボルト4が挿通される。ボルト4は、ヘッド部4aと、ヘッド部4aから軸方向に延びるシャフト部4bと、を有している。シャフト部4bは、カラー3の内径以下の外径を有している。シャフト部4bには、雄ネジが形成されている。締結対象部材2には、内壁に雌ネジが形成された固定孔2aが形成されている。固定孔2aは、ボルト4のシャフト部4bの外径に合致する径を有している。 A bolt 4 is inserted inside the collar 3 in the radial direction. The bolt 4 has a head portion 4a and a shaft portion 4b extending in the axial direction from the head portion 4a. The shaft portion 4b has an outer diameter equal to or smaller than the inner diameter of the collar 3. A male screw is formed on the shaft portion 4b. The fastening target member 2 is formed with a fixing hole 2a having a female screw formed on the inner wall. The fixing hole 2a has a diameter that matches the outer diameter of the shaft portion 4b of the bolt 4.

ボルト4は、シャフト部4bがカラー3を介して取付孔11に挿通された状態で、そのシャフト部4bの雄ネジが締結対象部材2の固定孔2aの雌ネジに螺合されることにより、その締結対象部材2に締め付けられる。このボルト4による締め付けにより、樹脂成形体1が締結対象部材2に締結される。尚、この締結時、図1に示す如く、ボルト4のヘッド部4aと、カラー3及び樹脂成形体1のフランジ部10の軸方向端面との間に、金属製のワッシャ5が介在されていてもよい。 The bolt 4 has a shaft portion 4b inserted into a mounting hole 11 via a collar 3, and a male screw of the shaft portion 4b is screwed into a female screw of a fixing hole 2a of a member 2 to be fastened. It is tightened to the fastening target member 2. By tightening with the bolt 4, the resin molded body 1 is fastened to the fastening target member 2. At the time of this fastening, as shown in FIG. 1, a metal washer 5 is interposed between the head portion 4a of the bolt 4 and the axial end surface of the flange portion 10 of the collar 3 and the resin molded body 1. May be good.

樹脂成形体1のフランジ部10には、ウェルド部13が形成されている。ウェルド部13は、成形時における樹脂の合流により取付孔11周囲の周縁部12に形成される部位である。すなわち、周縁部12は、ウェルド部13を有している。ウェルド部13は、取付孔11周囲の周縁部12に一箇所設けられる。尚、ウェルド部13は、少なくとも一箇所に設けられていればよい。 A weld portion 13 is formed on the flange portion 10 of the resin molded body 1. The weld portion 13 is a portion formed on the peripheral edge portion 12 around the mounting hole 11 due to the merging of the resins during molding. That is, the peripheral edge portion 12 has a weld portion 13. The weld portion 13 is provided at one location on the peripheral edge portion 12 around the mounting hole 11. The weld portion 13 may be provided at at least one place.

樹脂成形体1の周縁部12は、互いにウェルド部13を挟んで周方向に対向する対向部12a,12bを有している。ウェルド部13は、成形後に対向部12a,12bそれぞれを形成する予定の溶融樹脂同士が成形時に合流することにより、その対向部12a,12bそれぞれの周方向対向側に向いた端面同士が接した位置に発生する。ウェルド部13は、フランジ部10の外側面、取付孔11の孔壁面、及びフランジ部10の軸方向両端面に形成されるウェルドラインLを有している。ウェルドラインLは、フランジ部10の外側面と取付孔11の孔壁面とを結ぶように径方向に延びると共に、フランジ部10の軸方向両端間を結ぶように軸方向に延びる。 The peripheral edge portion 12 of the resin molded body 1 has facing portions 12a and 12b facing each other in the circumferential direction with the weld portion 13 interposed therebetween. The weld portion 13 is a position where the molten resins, which are to be formed of the facing portions 12a and 12b after molding, are merged with each other at the time of molding, so that the end faces of the facing portions 12a and 12b facing each other in the circumferential direction are in contact with each other. Occurs in. The weld portion 13 has a weld line L formed on the outer surface of the flange portion 10, the hole wall surface of the mounting hole 11, and both end faces in the axial direction of the flange portion 10. The weld line L extends in the radial direction so as to connect the outer surface of the flange portion 10 and the hole wall surface of the mounting hole 11, and extends in the axial direction so as to connect both ends in the axial direction of the flange portion 10.

次に、樹脂成形体1の取付孔11の形状について説明する。
取付孔11は、上記の如く断面略円形に形成されているが、具体的には以下の構造を有している。取付孔11は、断面円形に形成されつつ、外縁側(孔壁)の周方向一部(本実施形態では二箇所)が孔内側へ向けて凹むように形成されている。取付孔11周囲の周縁部12は、内壁側において周方向に部分的に切り欠かれた形状を有している。すなわち、周縁部12は、更に、切り欠かれた部位としての円弧部14と、その円弧部14に対して孔内側へ突出する突出部15と、を有している。
Next, the shape of the mounting hole 11 of the resin molded body 1 will be described.
The mounting hole 11 is formed to have a substantially circular cross section as described above, but specifically has the following structure. The mounting hole 11 is formed so that a part of the outer edge side (hole wall) in the circumferential direction (two places in the present embodiment) is recessed toward the inside of the hole while being formed with a circular cross section. The peripheral edge portion 12 around the mounting hole 11 has a shape partially cut out in the circumferential direction on the inner wall side. That is, the peripheral edge portion 12 further has an arc portion 14 as a notched portion and a protruding portion 15 projecting inward of the hole with respect to the arc portion 14.

円弧部14は、仮想円柱の側面に沿う円弧面14aを有している。この円弧面14aは、取付孔11の外方から軸方向に見て、仮想円柱の軸心Oを中心にしかつその仮想円柱の側面により形成される仮想円Cの円周上に沿うように形成されている。円弧部14は、取付孔11周囲の周縁部12において周方向二箇所に設けられている。周方向二箇所の円弧部14の円弧面14aは、互いに同一形状に形成されており、仮想円柱の軸心Oを挟んで互いに対向するように点対称に配置されている。尚、円弧部14は、カラー3と周縁部12との接触面積を小さくするうえでは周方向の弧長が長いことが好ましい。 The arc portion 14 has an arc surface 14a along the side surface of the virtual cylinder. The arcuate surface 14a is formed so as to be centered on the axis O of the virtual cylinder and along the circumference of the virtual circle C formed by the side surfaces of the virtual cylinder when viewed from the outside of the mounting hole 11 in the axial direction. Has been done. The arc portions 14 are provided at two locations in the circumferential direction on the peripheral edge portion 12 around the mounting hole 11. The arcuate surfaces 14a of the two arcuate portions 14 in the circumferential direction are formed to have the same shape as each other, and are arranged point-symmetrically so as to face each other with the axis O of the virtual cylinder interposed therebetween. The arc portion 14 preferably has a long arc length in the circumferential direction in order to reduce the contact area between the collar 3 and the peripheral edge portion 12.

突出部15は、円弧部14の円弧面14aに対して仮想円柱の軸心O側へ突出する部位であって、断面略台形状に形成されている。突出部15は、仮想円柱の側面に沿う円弧面15aを有している。この円弧面15aを形成するための仮想円柱は、円弧部14の円弧面14aを形成するための仮想円柱に対して軸心が一致しかつその仮想円柱よりも径が小さい同心円柱である。突出部15の円弧面15aは、取付孔11の外方から軸方向に見て、仮想円柱の軸心Oを中心にしかつその仮想円柱の側面により形成される仮想円の円周上に沿うように形成されている。円弧面15aは、周方向に円弧状に広がりかつ軸方向に平行に延びるように形成されている。突出部15は、取付孔11周囲の周縁部12において周方向二箇所に設けられている。周方向二箇所の突出部15の円弧面15aは、互いに同一形状に形成されており、仮想円柱の軸心Oを挟んで互いに対向するように点対称に配置されている。 The protruding portion 15 is a portion that protrudes toward the axial center O side of the virtual cylinder with respect to the arc surface 14a of the arc portion 14, and is formed in a substantially trapezoidal cross section. The protrusion 15 has an arcuate surface 15a along the side surface of the virtual cylinder. The virtual cylinder for forming the arc surface 15a is a concentric cylinder whose axis coincides with the virtual cylinder for forming the arc surface 14a of the arc portion 14 and whose diameter is smaller than the virtual cylinder. The arcuate surface 15a of the protrusion 15 is viewed axially from the outside of the mounting hole 11 so as to be centered on the axis O of the virtual cylinder and along the circumference of the virtual circle formed by the side surfaces of the virtual cylinder. Is formed in. The arcuate surface 15a is formed so as to spread in an arcuate shape in the circumferential direction and extend parallel to the axial direction. The protruding portions 15 are provided at two locations in the circumferential direction on the peripheral edge portion 12 around the mounting hole 11. The arcuate surfaces 15a of the two protruding portions 15 in the circumferential direction are formed in the same shape as each other, and are arranged point-symmetrically so as to face each other with the axis O of the virtual cylinder interposed therebetween.

円弧部14及び突出部15は、樹脂成形体1の取付孔11周囲の周縁部12において周方向に交互に配置されている。円弧部14と突出部15との境界には、段差となる角部16が形成されている。尚、角部16は、テーパ状に切り欠かれていてもよい。突出部15の円弧面15aの軸心Oからの距離(すなわち円弧半径)は、円弧部14の円弧面14aの軸心Oからの距離(すなわち円弧半径)よりも短い。 The arc portion 14 and the protruding portion 15 are alternately arranged in the circumferential direction at the peripheral edge portion 12 around the mounting hole 11 of the resin molded body 1. A corner portion 16 that serves as a step is formed at the boundary between the arc portion 14 and the protruding portion 15. The corner portion 16 may be cut out in a tapered shape. The distance of the arc surface 15a of the projecting portion 15 from the axis O (that is, the radius of the arc) is shorter than the distance of the arc surface 14a of the arc portion 14 from the axis O (that is, the radius of the arc).

上記の如く、カラー3は、取付孔11に圧入或いは焼嵌めにより嵌合される。突出部15とカラー3とは、互いに所定の締め代を有するように形成されている。一方、円弧部14とカラー3とは、突出部15とカラー3との締め代に比して小さい或いはゼロの締め代を有するように形成されている。突出部15は、取付孔11へのカラー3の嵌合状態においてカラー3の外筒面に接触する。一方、円弧部14は、取付孔11へのカラー3の嵌合状態においてカラー3の外筒面に対して非接触である。カラー3が取付孔11に嵌合された状態において、カラー3の外筒面と円弧部14との間には、隙間Sが形成されている。この隙間Sは、円弧部14に対応する領域に亘って一定の径方向幅で周方向に延びている。 As described above, the collar 3 is fitted into the mounting hole 11 by press fitting or shrink fitting. The protrusion 15 and the collar 3 are formed so as to have a predetermined tightening allowance with each other. On the other hand, the arc portion 14 and the collar 3 are formed so as to have a tightening allowance that is smaller or zero than the tightening allowance between the protruding portion 15 and the collar 3. The protruding portion 15 comes into contact with the outer cylinder surface of the collar 3 in the state where the collar 3 is fitted into the mounting hole 11. On the other hand, the arc portion 14 is in non-contact with the outer cylinder surface of the collar 3 when the collar 3 is fitted into the mounting hole 11. In a state where the collar 3 is fitted into the mounting hole 11, a gap S is formed between the outer cylinder surface of the collar 3 and the arc portion 14. The gap S extends in the circumferential direction with a constant radial width over the region corresponding to the arc portion 14.

尚、上記の非接触には、以下の態様が含まれてもよい。この態様は、例えば、円弧部14とカラー3とは現に接触しているが、円弧部14がカラー3から円弧外方へ受ける力が予め定めた所定値以下である状態である。以下、円弧部14を非接触円弧部14と、突出部15を接触突出部15と、それぞれ称す。 The non-contact may include the following aspects. In this embodiment, for example, the arc portion 14 and the collar 3 are actually in contact with each other, but the force received by the arc portion 14 from the collar 3 to the outside of the arc is equal to or less than a predetermined value. Hereinafter, the arc portion 14 will be referred to as a non-contact arc portion 14, and the protruding portion 15 will be referred to as a contact protruding portion 15.

取付孔11へのカラー3の嵌合は、それぞれ円弧面15aが取付孔11(具体的には、円弧面14a,15aの仮想円柱)の軸心Oを挟んで互いに対向する周方向二箇所の接触突出部15の接触面15aの間にカラー3が挟み込まれるように行われると共に、カラー3の外筒面と非接触円弧部14との間に隙間Sが形成されるように行われる。 The collar 3 is fitted into the mounting hole 11 at two locations in the circumferential direction in which the arcuate surfaces 15a face each other with the axial center O of the mounting holes 11 (specifically, the virtual cylinders of the arcuate surfaces 14a and 15a). The collar 3 is sandwiched between the contact surfaces 15a of the contact protrusion 15, and a gap S is formed between the outer cylinder surface of the collar 3 and the non-contact arc portion 14.

この嵌合構造によれば、カラー3の軸心が取付孔11の軸心Oからずれることすなわちカラー3が取付孔11に対して軸心Oに直交する何れかの方向に相対移動することは規制されるので、取付孔11でのカラー3の保持力を確保することができる。また、カラー3と接触突出部15とが面接触するので、取付孔11でのカラー3の保持力を向上させることができる。 According to this fitting structure, the axis of the collar 3 is displaced from the axis O of the mounting hole 11, that is, the collar 3 moves relative to the mounting hole 11 in any direction orthogonal to the axis O. Since it is regulated, the holding force of the collar 3 in the mounting hole 11 can be secured. Further, since the collar 3 and the contact protrusion 15 are in surface contact with each other, the holding force of the collar 3 in the mounting hole 11 can be improved.

取付孔11にカラー3が嵌合された状態において樹脂成形体1の周縁部12に発生する応力は、軸心O側から接触突出部15の円弧面15aに向けた方向(図4に示す矢印方向A)に作用する応力のみである。すなわち、その周縁部12に、軸心O側から非接触円弧部14の円弧面14aに向けた方向に作用する応力は発生しない。 The stress generated in the peripheral edge portion 12 of the resin molded body 1 when the collar 3 is fitted in the mounting hole 11 is in the direction from the axial center O side toward the arcuate surface 15a of the contact protrusion portion 15 (arrow shown in FIG. 4). Only the stress acting in the direction A). That is, no stress acts on the peripheral edge portion 12 in the direction from the axial center O side toward the arcuate surface 14a of the non-contact arc portion 14.

上記したウェルド部13は、周縁部12における接触突出部15の円弧面15aの径方向外側に、すなわち、周縁部12のうち接触突出部15の円弧面15aが形成された対応領域に設けられている。尚、ウェルド部13は、周縁部12に設けられた複数箇所の接触突出部15のうち成形時における樹脂の最下流側の一箇所の接触突出部15に対応して設けられていればよい。また、ウェルド部13は、接触突出部15の周方向中央位置を通って径方向に延びる線に沿うように形成されている。 The weld portion 13 described above is provided on the radial outside of the arc surface 15a of the contact protrusion 15 on the peripheral edge 12, that is, in the corresponding region of the peripheral edge 12 where the arc surface 15a of the contact protrusion 15 is formed. There is. The weld portion 13 may be provided corresponding to one contact protrusion 15 on the most downstream side of the resin at the time of molding among the plurality of contact protrusions 15 provided on the peripheral edge 12. Further, the weld portion 13 is formed along a line extending in the radial direction through the circumferential center position of the contact protrusion portion 15.

樹脂成形体1の取付孔11にカラー3が挿入され嵌合された状態で、ボルト4のシャフト部4bがそのカラー3に挿通されて、そのシャフト部4bの雄ネジが締結対象部材2の固定孔2aの雌ネジに螺合されると、その樹脂成形体1がボルト4を用いてその締結対象部材2に締結される。 With the collar 3 inserted and fitted into the mounting hole 11 of the resin molded body 1, the shaft portion 4b of the bolt 4 is inserted through the collar 3, and the male screw of the shaft portion 4b fixes the member 2 to be fastened. When screwed into the female screw of the hole 2a, the resin molded body 1 is fastened to the fastening target member 2 using the bolt 4.

上記構造を有する樹脂成形体1において、カラー3が取付孔11に嵌合された状態では、周縁部12に、軸心O側から各接触突出部15の円弧面15aに向けた方向(図4に示す矢印方向A)にのみ応力が作用するので、その応力が作用する方向がウェルド部13に対してウェルドラインLに沿った径方向になる。かかる応力が作用すると、周縁部12におけるウェルド部13とは異なる部位(具体的には、ウェルド部13から略90°だけ周方向に離間した、ウェルドラインLに対して略平行な方向に接線が延びる非接触円弧部14)に、そのウェルドラインLと平行な方向(図4に示す矢印方向B)に引き延ばす力が集中する。このため、接触突出部15のウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力は抑制される。 In the resin molded body 1 having the above structure, in a state where the collar 3 is fitted in the mounting hole 11, the direction of the peripheral edge portion 12 from the axial center O side toward the arcuate surface 15a of each contact protruding portion 15 (FIG. 4). Since the stress acts only in the arrow direction A) shown in the above, the direction in which the stress acts is the radial direction along the weld line L with respect to the weld portion 13. When such stress acts, a portion of the peripheral edge portion 12 different from the weld portion 13 (specifically, a tangent line in a direction substantially parallel to the weld line L, which is separated from the weld portion 13 in the circumferential direction by approximately 90 °). The stretching force is concentrated on the extending non-contact arc portion 14) in the direction parallel to the weld line L (arrow direction B shown in FIG. 4). Therefore, the force that separates the opposing portions 12a and 12b acting on the weld portion 13 of the contact protruding portion 15 in the circumferential direction and the radial direction is suppressed.

また、非接触円弧部14は、取付孔11へのカラー3の嵌合状態においてカラー3の外筒面に対して非接触であり、非接触円弧部14の円弧面14aとカラー3の外筒面との間には、隙間Sが形成される。この構造では、非接触円弧部14がウェルドラインLと平行な方向に引き延ばされると、その引き延ばしが非接触円弧部14の円弧面14aとカラー3の外筒面とが接しない状態で開始されるので、その非接触円弧部14が周方向へ引き延ばされ易くなる。非接触円弧部14と接触突出部15とが周方向に交互に配置された周縁部12において、非接触円弧部14が周方向に引き延ばされ易いと、その分だけ接触突出部15が周方向に引き延ばされ難くなる。このため、接触突出部15のウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力は抑制される。 Further, the non-contact arc portion 14 is in non-contact with the outer cylinder surface of the collar 3 when the collar 3 is fitted into the mounting hole 11, and the arc surface 14a of the non-contact arc portion 14 and the outer cylinder of the collar 3 are not in contact with each other. A gap S is formed between the surface and the surface. In this structure, when the non-contact arc portion 14 is stretched in the direction parallel to the weld line L, the stretching is started in a state where the arc surface 14a of the non-contact arc portion 14 and the outer cylinder surface of the collar 3 are not in contact with each other. Therefore, the non-contact arc portion 14 is easily stretched in the circumferential direction. In the peripheral edge portion 12 in which the non-contact arc portion 14 and the contact protrusion 15 are alternately arranged in the circumferential direction, if the non-contact arc portion 14 is easily stretched in the circumferential direction, the contact protrusion 15 is rotated by that amount. It becomes difficult to be stretched in the direction. Therefore, the force that separates the opposing portions 12a and 12b acting on the weld portion 13 of the contact protruding portion 15 in the circumferential direction and the radial direction is suppressed.

また、ウェルド部13が接触突出部15の周方向中央位置を通って設けられている状態で、樹脂成形体1の周縁部12に、ウェルド部13に対してウェルドラインLに沿って径方向に向いた応力が発生すると、周縁部12におけるウェルド部13を挟んだ周方向両側の対向部12a,12bはそれぞれ、カラー3から互いに略同じ大きさの応力で径方向外側に圧力を受ける。このため、両対向部12a,12bが径方向に相対的にずれるように変形することは抑制される。 Further, in a state where the weld portion 13 is provided through the central position in the circumferential direction of the contact protrusion 15, the peripheral portion 12 of the resin molded body 1 is radially relative to the weld portion 13 along the weld line L. When the facing stress is generated, the opposing portions 12a and 12b on both sides of the weld portion 13 on the peripheral edge portion 12 receive pressure from the collar 3 in the radial direction with substantially the same stress. Therefore, the deformation of the opposing portions 12a and 12b so as to be relatively displaced in the radial direction is suppressed.

更に、カラー3が取付孔11に嵌合された状態では、周縁部12に、軸心O側から非接触円弧部14の円弧面14aに向けた方向に作用する応力は発生しない。この場合、周縁部12におけるウェルド部13を挟んだ周方向両側の対向部12a,12bがそれぞれカラー3から周方向に受ける力の差はほとんどなく、それらの対向部12a,12bに互いに周方向異なる方向の力が作用することはなく或いは小さいので、両対向部12a,12bが周方向に相対的にずれるように変形することは抑制される。 Further, when the collar 3 is fitted in the mounting hole 11, no stress is generated on the peripheral edge portion 12 in the direction from the axial center O side toward the arcuate surface 14a of the non-contact arc portion 14. In this case, there is almost no difference in the forces of the peripheral portions 12 facing each other on both sides of the weld portion 13 in the circumferential direction from the collar 3 in the circumferential direction, and the opposing portions 12a and 12b are different from each other in the circumferential direction. Since the force in the direction does not act or is small, it is suppressed that the opposing portions 12a and 12b are deformed so as to be relatively displaced in the circumferential direction.

このように、周縁部12において、ウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力が小さく或いは略ゼロであり、ウェルド部13を周方向に挟んだ対向部12a,12bが径方向に相対的にずれる変形及び周方向に相対的にずれる変形が共に抑制される。従って、樹脂成形体1の構造によれば、周縁部12のウェルド部13における伸び変形或いは歪み変形を低減させることができるので、そのウェルド部13の、対向部12a,12bの周方向への相対的ずれや径方向への相対的ずれによる破断を抑えることができる。 As described above, in the peripheral edge portion 12, the force for separating the opposing portions 12a and 12b acting on the weld portion 13 in the circumferential direction and the radial direction is small or substantially zero, and the facing portion 12a sandwiching the weld portion 13 in the circumferential direction is small or substantially zero. , 12b is suppressed both in the radial direction and in the circumferential direction. Therefore, according to the structure of the resin molded body 1, the elongation deformation or the strain deformation in the weld portion 13 of the peripheral portion 12 can be reduced, so that the weld portion 13 is relative to the facing portions 12a and 12b in the circumferential direction. It is possible to suppress breakage due to target deviation or relative deviation in the radial direction.

また、周縁部12において、カラー3の外筒面に接触しない非接触円弧部14は、仮想円柱の軸心Oを中心にした仮想円の円周上に沿うように形成されている。この構造では、非接触円弧部14とカラー3の外筒面との間の隙間Sが周方向に亘って均一な径方向幅を有する。このため、樹脂成形体1の構造によれば、例えば周縁部12においてカラー3の外筒面に接触しない部位が例えば楕円の周上に沿うように形成される構造に比べて、非接触円弧部14をウェルドラインLと平行な方向に引き延ばし易くなっている。 Further, in the peripheral edge portion 12, the non-contact arc portion 14 that does not contact the outer cylinder surface of the collar 3 is formed so as to be along the circumference of the virtual circle centered on the axis O of the virtual cylinder. In this structure, the gap S between the non-contact arc portion 14 and the outer cylinder surface of the collar 3 has a uniform radial width over the circumferential direction. Therefore, according to the structure of the resin molded body 1, for example, the non-contact arc portion is formed in the peripheral portion 12 so that the portion that does not contact the outer cylinder surface of the collar 3 is formed along the circumference of the ellipse, for example. 14 is easily stretched in a direction parallel to the weld line L.

また、この樹脂成形体1の構造においては、接触突出部15とカラー3との締め代が予め想定される大きさに比して大きい寸法であっても、周縁部12においてウェルド部13から略90°だけ周方向に離間した非接触円弧部14に作用する、そのウェルドラインLと平行な方向に引き延ばす力が増加するだけであり、ウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力はほとんど変わらない。従って、樹脂成形体1の構造によれば、接触突出部15とカラー3との締め代寸法の不良を低減することができ、その良品幅を拡大することができる。このため、樹脂成形体1の歩留まりを向上させることができ、コストダウンを図ることができる。 Further, in the structure of the resin molded body 1, even if the tightening allowance between the contact protrusion 15 and the collar 3 is larger than the size assumed in advance, the peripheral portion 12 is omitted from the weld portion 13. The force acting on the non-contact arc portion 14 which is separated in the circumferential direction by 90 ° and extending in the direction parallel to the weld line L only increases, and the opposing portions 12a and 12b acting on the weld portion 13 are in the circumferential direction. And the pulling force in the radial direction is almost the same. Therefore, according to the structure of the resin molded body 1, it is possible to reduce the defect of the tightening allowance dimension between the contact protrusion 15 and the collar 3, and it is possible to expand the width of the good product. Therefore, the yield of the resin molded product 1 can be improved, and the cost can be reduced.

更に、樹脂成形体1は、繊維強化樹脂により形成されている。この構造では、ウェルド部13において繊維が周方向に亘って延在しないので、ウェルド部13の弾性率が他の部位に比べて高くなり、ウェルド部13の強度が問題となり易い。これに対して、樹脂成形体1においては、上記の如く、応力がウェルド部13に対してウェルドラインLに沿った径方向に作用することで、ウェルド部13の、対向部12a,12bの周方向への相対的ずれや径方向への相対的ずれによる破断を抑えることができるので、この繊維強化樹脂により形成されたものでもウェルド部13の強度問題が生じ難く、より顕著な効果を得ることが可能である。また、繊維強化樹脂により形成された樹脂成形体1によれば、高温下で高い強度が必要となるエンジン用パーツやターボダクトなどにも使用可能であるので、対象範囲の拡大を図ることができる。 Further, the resin molded body 1 is formed of a fiber reinforced resin. In this structure, since the fibers do not extend in the circumferential direction in the weld portion 13, the elastic modulus of the weld portion 13 is higher than that of other portions, and the strength of the weld portion 13 tends to be a problem. On the other hand, in the resin molded body 1, as described above, stress acts on the weld portion 13 in the radial direction along the weld line L, so that the circumferences of the facing portions 12a and 12b of the weld portion 13 are peripheral. Since it is possible to suppress breakage due to relative deviation in the direction and relative deviation in the radial direction, the strength problem of the weld portion 13 is unlikely to occur even if it is formed of this fiber reinforced resin, and a more remarkable effect can be obtained. Is possible. Further, according to the resin molded body 1 formed of the fiber reinforced resin, it can be used for engine parts and turbo ducts that require high strength at high temperatures, so that the target range can be expanded. ..

ところで、上記の第1実施形態においては、カラー3の外筒面に面接触する円弧面15aを有する接触突出部15が、樹脂成形体1の取付孔11周囲の周縁部12に周方向二箇所設けられている。しかし、本発明はこれに限定されるものではない。その円弧面15aを有する接触突出部15が、その周縁部12に周方向三箇所以上設けられていてもよい。例えば、図5に示す如く、この接触突出部15が、周縁部12に周方向三箇所設けられていてもよい。尚、周方向三箇所の接触突出部15は、互いに同一形状に形成されているのが好ましい。また、周方向三箇所の接触突出部15は、周方向に等間隔に離間して設けられているのが好ましい。また、ウェルド部13は、周方向三箇所の接触突出部15のうち何れか一の接触突出部15の径方向外側に設けられていればよい。 By the way, in the above-mentioned first embodiment, the contact protruding portions 15 having the arc surface 15a in surface contact with the outer cylinder surface of the collar 3 are provided at two locations in the circumferential direction on the peripheral edge portion 12 around the mounting hole 11 of the resin molded body 1. It is provided. However, the present invention is not limited to this. The contact projecting portion 15 having the arc surface 15a may be provided at three or more locations in the circumferential direction on the peripheral edge portion 12. For example, as shown in FIG. 5, the contact protruding portions 15 may be provided on the peripheral edge portion 12 at three locations in the circumferential direction. It is preferable that the three contact protrusions 15 in the circumferential direction are formed in the same shape as each other. Further, it is preferable that the three contact protrusions 15 in the circumferential direction are provided at equal intervals in the circumferential direction. Further, the weld portion 13 may be provided on the radial side of any one of the three contact protrusions 15 in the circumferential direction.

[第2実施形態]
図6を用いて、第2実施形態の樹脂成形体1について説明する。尚、図6において、上記図1−図4に示す構成と同一の構成部分については、同一の符号を付してその説明を省略又は簡略する。
[Second Embodiment]
The resin molded product 1 of the second embodiment will be described with reference to FIG. In FIG. 6, the same components as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

上記した第1実施形態では、樹脂成形体1の周縁部12の接触突出部15が、カラー3の外筒面に面接触する接触面としての円弧面15aを有している。この構造では、カラー3が取付孔11に対して軸心Oに直交する何れかの方向に相対移動するのを規制するうえで、円弧面15aを有する接触突出部15が周縁部12に周方向二箇所以上設けられていればよい。 In the first embodiment described above, the contact protruding portion 15 of the peripheral edge portion 12 of the resin molded body 1 has an arcuate surface 15a as a contact surface that makes surface contact with the outer cylinder surface of the collar 3. In this structure, in order to restrict the collar 3 from moving relative to the mounting hole 11 in any direction orthogonal to the axis O, the contact protrusion 15 having the arcuate surface 15a is circumferentially oriented around the peripheral edge 12. It suffices if two or more places are provided.

これに対して、第2実施形態の樹脂成形体1では、周縁部12の接触突出部15が、カラー3の外筒面に線接触する接触部15bを有している。接触突出部15は、非接触円弧部14の円弧面14aに対して仮想円柱の軸心O側へ突出している。接触突出部15は、仮想円柱の軸心O側に断面弦状に広がる板状の板面部15cを有している。上記の接触部15bは、板面部15c上において軸心Oに対して平行に延びる方向に線状に形成される。 On the other hand, in the resin molded body 1 of the second embodiment, the contact protruding portion 15 of the peripheral edge portion 12 has a contact portion 15b that makes line contact with the outer cylinder surface of the collar 3. The contact projecting portion 15 projects toward the axial center O side of the virtual cylinder with respect to the arc surface 14a of the non-contact arc portion 14. The contact protruding portion 15 has a plate-shaped plate surface portion 15c extending in a chord-like cross section on the O-side of the axis of the virtual cylinder. The contact portion 15b is formed linearly on the plate surface portion 15c in a direction extending parallel to the axis O.

接触部15bを有する接触突出部15は、周縁部12に周方向三箇所以上(本実施形態では周方向三箇所)設けられている。周方向三箇所の接触突出部15は、互いに同一形状に形成されており、周方向に等間隔に離間して設けられている。非接触円弧部14は、取付孔11周囲の周縁部12に周方向三箇所以上(本実施形態では周方向三箇所)設けられている。 The contact protruding portion 15 having the contact portion 15b is provided on the peripheral edge portion 12 at three or more locations in the circumferential direction (three locations in the circumferential direction in the present embodiment). The three contact protrusions 15 in the circumferential direction are formed to have the same shape as each other, and are provided at equal intervals in the circumferential direction. The non-contact arc portion 14 is provided at three or more locations in the circumferential direction (three locations in the circumferential direction in the present embodiment) on the peripheral edge portion 12 around the mounting hole 11.

非接触円弧部14及び接触突出部15は、樹脂成形体1の取付孔11周囲の周縁部12において周方向に交互に配置されている。接触突出部15の接触部15bの軸心Oからの距離は、非接触円弧部14の円弧面14aの軸心Oからの距離(すなわち円弧半径)よりも短い。 The non-contact arc portion 14 and the contact protrusion 15 are alternately arranged in the circumferential direction at the peripheral edge portion 12 around the mounting hole 11 of the resin molded body 1. The distance of the contact portion 15b of the contact protrusion 15 from the axis O is shorter than the distance of the arc surface 14a of the non-contact arc portion 14 from the axis O (that is, the radius of the arc).

カラー3は、取付孔11に圧入或いは焼嵌めにより嵌合される。接触突出部15とカラー3とは、互いに所定の締め代を有するように形成されている。一方、非接触円弧部14とカラー3とは、接触突出部15とカラー3との締め代に比して小さい或いはゼロの締め代を有するように形成されている。接触突出部15の接触部15bは、取付孔11へのカラー3の嵌合状態においてカラー3の外筒面に線接触する。取付孔11へのカラー3の嵌合は、カラー3が周方向三箇所の接触突出部15の接触部15bにより軸心O側に向けて押されるように行われると共に、カラー3の外筒面と非接触円弧部14との間に隙間Sが形成されるように行われる。 The collar 3 is fitted into the mounting hole 11 by press fitting or shrink fitting. The contact protrusion 15 and the collar 3 are formed so as to have a predetermined tightening allowance with each other. On the other hand, the non-contact arc portion 14 and the collar 3 are formed so as to have a tightening allowance smaller or zero than the tightening allowance between the contact protruding portion 15 and the collar 3. The contact portion 15b of the contact protrusion 15 makes line contact with the outer cylinder surface of the collar 3 in the state where the collar 3 is fitted into the mounting hole 11. The collar 3 is fitted into the mounting hole 11 so that the collar 3 is pushed toward the axial center O side by the contact portions 15b of the contact protrusions 15 at three points in the circumferential direction, and the outer cylinder surface of the collar 3 is fitted. It is performed so that a gap S is formed between the non-contact arc portion 14 and the non-contact arc portion 14.

この嵌合構造によれば、カラー3の軸心が取付孔11の軸心Oからずれることすなわちカラー3が取付孔11に対して軸心Oに直交する何れかの方向に相対移動することは規制されるので、取付孔11でのカラー3の保持力を確保することができる。また、上記の嵌合状態においてカラー3の外筒面と接触突出部15の接触部15bとが線接触する接触面積は、面接触時の接触面積に比べて小さいので、カラー3を取付孔11に挿入する際の組み付け性を向上させることができる。 According to this fitting structure, the axis of the collar 3 is displaced from the axis O of the mounting hole 11, that is, the collar 3 moves relative to the mounting hole 11 in any direction orthogonal to the axis O. Since it is regulated, the holding force of the collar 3 in the mounting hole 11 can be secured. Further, in the above-mentioned fitting state, the contact area where the outer cylinder surface of the collar 3 and the contact portion 15b of the contact protrusion 15 make line contact is smaller than the contact area at the time of surface contact, so that the collar 3 is attached to the mounting hole 11. It is possible to improve the assembling property when inserting into.

ウェルド部13は、周縁部12における接触突出部15の接触部15bの径方向外側に、すなわち、接触突出部15の接触部15bの位置を通るように周縁部12に設けられている。尚、ウェルド部13は、周縁部12に設けられた複数箇所の接触突出部15のうち成形時における樹脂の最下流側の一箇所の接触突出部15に設けられていればよい。また、ウェルド部13は、ウェルドラインLが接触突出部15の接触部15bから径方向外側に向けて延びる線に沿うように設けられていることが望ましい。 The weld portion 13 is provided on the peripheral edge portion 12 so as to pass the radial outside of the contact portion 15b of the contact protruding portion 15 on the peripheral edge portion 12, that is, the position of the contact portion 15b of the contact protruding portion 15. The weld portion 13 may be provided at one of the plurality of contact protrusions 15 provided on the peripheral edge 12 on the most downstream side of the resin at the time of molding. Further, it is desirable that the weld portion 13 is provided so that the weld line L is provided along a line extending radially outward from the contact portion 15b of the contact protrusion 15.

上記構造を有する樹脂成形体1において、カラー3が取付孔11に嵌合された状態では、周縁部12に、軸心O側から各接触突出部15の接触部15bに向けた方向に応力が作用する。その応力の一つが作用する方向がウェルド部13に対してウェルドラインLに沿った径方向になると共に、他の応力がウェルド部13とは異なる部位(具体的には、ウェルド部13から周方向120°だけ離間した部位)に生じるので、ウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力は小さい。 In the resin molded body 1 having the above structure, when the collar 3 is fitted in the mounting hole 11, stress is applied to the peripheral edge portion 12 in the direction from the axial center O side toward the contact portion 15b of each contact protruding portion 15. It works. The direction in which one of the stresses acts is the radial direction along the weld line L with respect to the weld portion 13, and the other stress is different from the weld portion 13 (specifically, the circumferential direction from the weld portion 13). Since it occurs at a portion separated by 120 °), the force that separates the opposing portions 12a and 12b acting on the weld portion 13 in the circumferential direction and the radial direction is small.

また、上記の如く接触部15bに向けた方向の応力が作用すると、周縁部12における接触突出部15間の非接触円弧部14に、周方向に引き延ばす力が集中する。更に、非接触円弧部14の円弧面14aとカラー3の外筒面との間には、隙間Sが形成されるので、その非接触円弧部14が周方向へ引き延ばされ易い。このため、接触突出部15のウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力は抑制される。 Further, when the stress in the direction toward the contact portion 15b acts as described above, the force for stretching in the circumferential direction is concentrated on the non-contact arc portion 14 between the contact protrusions 15 on the peripheral edge portion 12. Further, since a gap S is formed between the arc surface 14a of the non-contact arc portion 14 and the outer cylinder surface of the collar 3, the non-contact arc portion 14 is easily stretched in the circumferential direction. Therefore, the force that separates the opposing portions 12a and 12b acting on the weld portion 13 of the contact protruding portion 15 in the circumferential direction and the radial direction is suppressed.

また、ウェルド部13が接触突出部15の接触部15bの位置を通って設けられている状態で、樹脂成形体1の周縁部12に、ウェルド部13に対してウェルドラインLに沿って径方向に向いた応力が発生すると、周縁部12におけるウェルド部13を挟んだ周方向両側の対向部12a,12bはそれぞれ、カラー3から互いに略同じ大きさの応力で径方向外側に接触圧を受ける。このため、両対向部12a,12bが径方向に相対的にずれるように変形することは抑制される。 Further, in a state where the weld portion 13 is provided through the position of the contact portion 15b of the contact protrusion portion 15, the peripheral portion 12 of the resin molded body 1 is radially relative to the weld portion 13 along the weld line L. When a stress is generated in the peripheral portion 12, the opposing portions 12a and 12b on both sides of the weld portion 13 in the peripheral portion 12 receive contact pressure outward from the collar 3 with substantially the same stress as each other in the radial direction. Therefore, the deformation of the opposing portions 12a and 12b so as to be relatively displaced in the radial direction is suppressed.

更に、カラー3が取付孔11に嵌合された状態では、周縁部12に、軸心O側から非接触円弧部14の円弧面14aに向けた方向に作用する応力は発生しない。この場合、周縁部12におけるウェルド部13を挟んだ周方向両側の対向部12a,12bがそれぞれカラー3から周方向に受ける力の差はほとんどなく、それらの対向部12a,12bに互いに周方向異なる方向の力が作用することはなく或いは小さいので、両対向部12a,12bが周方向に相対的にずれるように変形することは抑制される。 Further, when the collar 3 is fitted in the mounting hole 11, no stress is generated on the peripheral edge portion 12 in the direction from the axial center O side toward the arcuate surface 14a of the non-contact arc portion 14. In this case, there is almost no difference in the forces of the peripheral portions 12 facing each other on both sides of the weld portion 13 in the circumferential direction from the collar 3 in the circumferential direction, and the opposing portions 12a and 12b are different from each other in the circumferential direction. Since the force in the direction does not act or is small, it is suppressed that the opposing portions 12a and 12b are deformed so as to be relatively displaced in the circumferential direction.

このように、周縁部12において、ウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力が小さく或いは略ゼロであり、ウェルド部13を周方向に挟んだ対向部12a,12bが径方向に相対的にずれる変形及び周方向に相対的にずれる変形が共に抑制される。従って、樹脂成形体1の構造においても、周縁部12のウェルド部13における伸び変形或いは歪み変形を低減させることができるので、そのウェルド部13の、対向部12a,12bの周方向への相対的ずれや径方向への相対的ずれによる破断を抑えることができる。 As described above, in the peripheral edge portion 12, the force for separating the opposing portions 12a and 12b acting on the weld portion 13 in the circumferential direction and the radial direction is small or substantially zero, and the facing portion 12a sandwiching the weld portion 13 in the circumferential direction is small or substantially zero. , 12b is suppressed both in the radial direction and in the circumferential direction. Therefore, even in the structure of the resin molded body 1, since the elongation deformation or the strain deformation in the weld portion 13 of the peripheral portion 12 can be reduced, the relative of the weld portion 13 in the circumferential direction of the facing portions 12a and 12b. Breakage due to displacement or relative displacement in the radial direction can be suppressed.

また、周縁部12において、カラー3の外筒面に接触しない非接触円弧部14は、仮想円柱の軸心Oを中心にした仮想円の円周上に沿うように形成されている。この構造では、非接触円弧部14とカラー3の外筒面との間の隙間Sが周方向に亘って均一な径方向幅を有する。このため、樹脂成形体1の構造によれば、例えば周縁部12においてカラー3の外筒面に接触しない部位が例えば楕円の周上に沿うように形成される構造に比べて、非接触円弧部14をウェルドラインLと平行な方向に引き延ばし易くなっている。 Further, in the peripheral edge portion 12, the non-contact arc portion 14 that does not contact the outer cylinder surface of the collar 3 is formed so as to be along the circumference of the virtual circle centered on the axis O of the virtual cylinder. In this structure, the gap S between the non-contact arc portion 14 and the outer cylinder surface of the collar 3 has a uniform radial width over the circumferential direction. Therefore, according to the structure of the resin molded body 1, for example, the non-contact arc portion is formed in the peripheral portion 12 so that the portion that does not contact the outer cylinder surface of the collar 3 is formed along the circumference of the ellipse, for example. 14 is easily stretched in a direction parallel to the weld line L.

また、この樹脂成形体1の構造においては、接触突出部15とカラー3との締め代が予め想定される大きさに比して大きい寸法であっても、周縁部12の接触部15bから径方向外側に作用する力が増加するだけであり、ウェルド部13に作用する対向部12a,12b同士を周方向や径方向に引き離す力はほとんど変わらない。従って、樹脂成形体1の構造においても、接触突出部15とカラー3との締め代寸法の不良を低減することができ、その良品幅を拡大することができる。このため、樹脂成形体1の歩留まりを向上させることができ、コストダウンを図ることができる。 Further, in the structure of the resin molded body 1, even if the tightening allowance between the contact protrusion 15 and the collar 3 is larger than the size assumed in advance, the diameter from the contact portion 15b of the peripheral edge portion 12 Only the force acting on the outer side of the direction increases, and the force for pulling the opposing portions 12a and 12b acting on the weld portion 13 apart from each other in the circumferential direction and the radial direction is almost the same. Therefore, even in the structure of the resin molded body 1, it is possible to reduce the defect of the tightening allowance dimension between the contact protrusion 15 and the collar 3, and it is possible to expand the width of the good product. Therefore, the yield of the resin molded product 1 can be improved, and the cost can be reduced.

ところで、上記の第2実施形態においては、接触突出部15が、カラー3の外筒面に線接触する接触部15bを有し、その接触部15bが、取付孔11の軸心O側に断面弦状に広がる板状の板面部15c上において軸心Oに対して平行に延びる方向に線状に形成される。しかし、本発明はこれに限定されるものではない。例えば、図7に示す如く、接触部15bが、その板面部15cに代えて、取付孔11の軸心O側に山状又は瘤状に出っ張った出張部15dの頂点上において軸心Oに対して平行に延びる方向に線状に形成されていてもよい。この変形形態の構造でも、第2実施形態の構造と同様の効果を得ることができる。 By the way, in the second embodiment described above, the contact protruding portion 15 has a contact portion 15b that makes line contact with the outer cylinder surface of the collar 3, and the contact portion 15b has a cross section on the axial center O side of the mounting hole 11. It is formed linearly on a plate-shaped plate surface portion 15c extending in a string shape in a direction extending parallel to the axis O. However, the present invention is not limited to this. For example, as shown in FIG. 7, the contact portion 15b replaces the plate surface portion 15c with respect to the axial center O on the apex of the business trip portion 15d protruding toward the axial center O side of the mounting hole 11 in a mountain-shaped or concave shape. It may be formed linearly in a direction extending in parallel. Even with this modified structure, the same effect as that of the structure of the second embodiment can be obtained.

また、上記の第2実施形態においては、接触部15bを有する接触突出部15は、周縁部12に周方向三箇所設けられている。しかし、本発明はこれに限定されるものではない。その接触部15bを有する接触突出部15が、その周縁部12に周方向四箇所以上設けられていてもよい。例えば、図8に示す如く、この接触突出部15が、周縁部12に周方向四箇所設けられていてもよい。尚、周方向四箇所の接触突出部15は、互いに同一形状に形成されていてよく、また、周方向に等間隔に離間して設けられていてよい。また、ウェルド部13は、周方向四箇所の接触突出部15のうち何れか一の接触突出部15の径方向外側に設けられていればよい。 Further, in the second embodiment described above, the contact protruding portion 15 having the contact portion 15b is provided on the peripheral edge portion 12 at three locations in the circumferential direction. However, the present invention is not limited to this. The contact protruding portion 15 having the contact portion 15b may be provided at four or more locations in the circumferential direction on the peripheral edge portion 12. For example, as shown in FIG. 8, the contact protruding portions 15 may be provided on the peripheral edge portion 12 at four locations in the circumferential direction. The four contact protrusions 15 in the circumferential direction may be formed in the same shape as each other, or may be provided at equal intervals in the circumferential direction. Further, the weld portion 13 may be provided on the radial side of any one of the four contact protrusions 15 in the circumferential direction.

また、上記の第2実施形態においては、周縁部12の接触突出部15の接触部15bが、カラー3の外筒面に線接触する。しかし、本発明はこれに限定されるものではなく、その接触部15bが、カラー3の外筒面に点接触するものであってもよい。この変形形態において、この接触突出部15は、軸方向に離間して点在するように配置されるものであってよい。 Further, in the second embodiment described above, the contact portion 15b of the contact protrusion 15 of the peripheral edge portion 12 makes line contact with the outer cylinder surface of the collar 3. However, the present invention is not limited to this, and the contact portion 15b may make point contact with the outer cylinder surface of the collar 3. In this modified form, the contact protrusions 15 may be arranged so as to be scattered in the axial direction.

尚、本発明は、上述した実施形態や変形形態に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で種々の変更を施すことが可能である。 The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention.

1:樹脂成形体、2:締結対象部材、3:カラー、4:ボルト、10:フランジ部、11:取付孔、12:周縁部、13:ウェルド部、14:非接触円弧部、14a:円弧面、15:接触突出部、15a:円弧面(接触面)、15b:接触部。 1: Resin molded body 2: Fastening target member 3: Collar, 4: Bolt, 10: Flange part, 11: Mounting hole, 12: Peripheral part, 13: Weld part, 14: Non-contact arc part, 14a: Arc Surface, 15: contact protrusion, 15a: arcuate surface (contact surface), 15b: contact portion.

Claims (3)

円筒状のカラーが嵌合される取付孔と、前記取付孔の周囲に形成される周縁部と、を備える樹脂成形体であって、
前記周縁部は、
成形時における樹脂の合流により形成されるウェルド部と、
仮想円柱の側面に沿う円弧面が形成され、前記カラーの外筒面に対して非接触である非接触円弧部と、
周方向において二箇所又は三箇所設けられ、それぞれ、前記非接触円弧部の前記円弧面に対して前記仮想円柱の軸心側へ突出すると共に、周方向に円弧状に広がりかつ軸方向に平行に延びるように形成された、前記カラーの外筒面に面接触する接触面を有する接触突出部と、
を有し、
前記接触突出部は、前記カラーに対して所定の締め代を有するように形成され、
前記ウェルド部は、前記周縁部のうち前記接触突出部の前記接触面が形成された対応領域に設けられ
前記非接触円弧部は、前記ウェルド部のウェルドラインと平行な方向に引き延ばす力が集中するような周方向位置に配置されている、樹脂成形体。
A resin molded product comprising a mounting hole into which a cylindrical collar is fitted and a peripheral edge formed around the mounting hole.
The peripheral portion
Weld part formed by merging of resins during molding,
An arc surface along the side surface of the virtual cylinder is formed, and a non-contact arc portion that is non-contact with the outer cylinder surface of the collar and a non-contact arc portion.
Two or three locations are provided in the circumferential direction, and each of the non-contact arc portion projects toward the axial center of the virtual cylinder with respect to the arc surface, and spreads in an arc shape in the circumferential direction and parallel to the axial direction. A contact protrusion having a contact surface that is formed to extend and has a contact surface that makes surface contact with the outer cylinder surface of the collar.
Have,
The contact protrusion is formed so as to have a predetermined tightening allowance with respect to the collar.
The weld portion is provided in a corresponding region of the peripheral portion where the contact surface of the contact protrusion is formed .
The non-contact arc portion is a resin molded body arranged at a circumferential position in which a stretching force is concentrated in a direction parallel to the weld line of the weld portion .
前記ウェルド部は、前記接触突出部の周方向中央位置を通るように設けられている、請求項1に記載の樹脂成形体。 The resin molded product according to claim 1, wherein the weld portion is provided so as to pass through a central position in the circumferential direction of the contact protrusion portion. 前記樹脂成形体は、繊維強化樹脂により形成されている、請求項1乃至の何れか一項に記載の樹脂成形体。 The resin molded body according to any one of claims 1 to 2 , wherein the resin molded body is made of a fiber reinforced resin.
JP2017135014A 2017-07-10 2017-07-10 Resin molded body Active JP6805988B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017135014A JP6805988B2 (en) 2017-07-10 2017-07-10 Resin molded body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017135014A JP6805988B2 (en) 2017-07-10 2017-07-10 Resin molded body

Publications (2)

Publication Number Publication Date
JP2019015382A JP2019015382A (en) 2019-01-31
JP6805988B2 true JP6805988B2 (en) 2020-12-23

Family

ID=65358404

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017135014A Active JP6805988B2 (en) 2017-07-10 2017-07-10 Resin molded body

Country Status (1)

Country Link
JP (1) JP6805988B2 (en)

Also Published As

Publication number Publication date
JP2019015382A (en) 2019-01-31

Similar Documents

Publication Publication Date Title
KR101534091B1 (en) Attachment arrangement for composite wheels
JP5474710B2 (en) Torque transmission tolerance ring
CN106795908B (en) Bearing cap for internal combustion engine
US20120298832A1 (en) Vibration-damping device
US7524116B2 (en) Cage for tapered ball bearings
KR20180132903A (en) A combination comprising a housing and a flange,
US8758149B1 (en) Elastomeric coupling having clamp ring with flanges providing torsional stiffness characteristics
JP6805988B2 (en) Resin molded body
JP5310970B2 (en) Device for securing a plastic component to a support part
KR20180064512A (en) Shaft coupling
JP2006118582A (en) Female screw part
CN213360779U (en) Fixing device
KR20190006625A (en) Joint flange for pipe
US20170044966A1 (en) Micro shear hub dual ring isolator
JPH10274268A (en) Vibration isolation bush and bush assembly
JP2016223571A (en) Fitting structure between through-hole of resin member and collar
KR102298921B1 (en) Bush Indenting Device using Bush Guide
JP5503610B2 (en) Forging die
KR20020005624A (en) A piston and a piston rod for an internal combustion engine
JP2003269509A (en) Vibration control bush
JP6990913B2 (en) Piping joint structure
JPH07280013A (en) Vibration isolating bushing
WO2018101211A1 (en) Structure for attaching resin member
JP2021116862A (en) Fastening structure
JP2022077146A (en) Center bearing support

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190828

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20200619

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200623

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20200807

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20201104

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20201117

R150 Certificate of patent or registration of utility model

Ref document number: 6805988

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150