JP2010125822A - Annular resin molded article - Google Patents

Annular resin molded article Download PDF

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JP2010125822A
JP2010125822A JP2008306284A JP2008306284A JP2010125822A JP 2010125822 A JP2010125822 A JP 2010125822A JP 2008306284 A JP2008306284 A JP 2008306284A JP 2008306284 A JP2008306284 A JP 2008306284A JP 2010125822 A JP2010125822 A JP 2010125822A
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web
resin molded
resin
molded product
flow control
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JP5264447B2 (en
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Yasumi Wakabayashi
康未 若林
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Tigers Polymer Corp
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Tigers Polymer Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular resin molded article having improved rigidity while maintaining preferable size accuracy, provided by integrating an insert member and a resin member according to insert molding. <P>SOLUTION: The annular resin molded article 11 comprises: a resin molded part which is composed of a web 13, a boss 12 and a rim 14 and is injection-molded from a plurality of gates 31 concentrically at substantially regular intervals on the web 13 surface; and the insert member 21 which has through-holes 22 perforated on parts opposite to the gates 31 and is embedded in the web 13, whereby the resin molded part is integrally formed around the insert member 21. Therein, the annular resin molded article 11 is characterized in that a flow control part 16 which is protruded or recessed from or into the web is disposed on the web in such a shape as to cover the through-holes 22 viewing from the axial direction of the annular resin molded article 11. The flow control part 16 is preferably circular viewing from the axial direction and, further, is preferably disposed concentrically with the through-holes 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、インサート成形により形成される環状樹脂成形品、特に金属インサートにより剛性を大きくしながらも寸法精度の優れた樹脂製歯車に関するものである。 The present invention relates to an annular resin molded product formed by insert molding, and more particularly to a resin gear having excellent dimensional accuracy while increasing rigidity by a metal insert.

近年、金属代替品として汎用されているエンジニアリングプラスチックにより射出成形される合成樹脂歯車、プーリー等の環状樹脂成形品は、外周面や内周面の真円度等に厳しい精度が要求されている一方、相手側の歯車やラック等と噛み合って動力伝達する際に受ける機械的力に耐える剛性を大きくしたものが要求されている。 In recent years, cyclic resin molded products such as synthetic resin gears and pulleys that are injection-molded with engineering plastics that are widely used as metal substitutes are required to have strict accuracy with respect to the roundness of the outer peripheral surface and inner peripheral surface. Therefore, there is a demand for a material having increased rigidity to withstand the mechanical force that is received when power is transmitted by meshing with a gear or rack on the other side.

そこで、樹脂成形部特にウェブ内に金属インサートを埋設した樹脂歯車等の環状樹脂成形品をインサート成形することが提案されている。そして、この種の成形品では、従来、周方向に連続した円盤状の金属インサートを成形用金型内に配し、金型内に溶融樹脂を注入固化せしめて、金属インサートとボス、ウェブ、リムならびに歯等からなる樹脂成形部とを一体形成するが、樹脂の成形収縮を周方向に亘りできる限り均一化するため、ウェブの表面に同心円上に略等間隔に設けられた複数のゲートから樹脂を注入し射出成形している。 Therefore, it has been proposed to insert-mold an annular resin molded product such as a resin gear in which a metal insert is embedded in a resin molded portion, particularly a web. And in this type of molded product, conventionally, a disc-shaped metal insert continuous in the circumferential direction is arranged in a molding die, and molten resin is injected and solidified in the mold, so that the metal insert, boss, web, The resin molding part consisting of the rim and teeth etc. is integrally formed, but in order to make the molding shrinkage of the resin uniform as much as possible in the circumferential direction, from a plurality of gates provided on the surface of the web concentrically at substantially equal intervals Resin is injected and injection molded.

しかしながら、ゲートから注入した樹脂は、金属インサートの表面上に沿って樹脂成形部の片面のウェブ、ボス、リム等を充填してから、金属インサートの裏面側に廻り込んで他面の樹脂成形部を充填成形していくため、樹脂の流れが不均一で偏ったものとなり、また樹脂の注入開始から終了まで成形に要する時間や樹脂の流動距離が長くなり、歯部をはじめとする樹脂成形部への充填不均一を招き、良好な寸法精度が得られないという問題があった。また、金型内の樹脂成形部の樹脂流動路が狭い場合には流動抵抗が大きくなり、成形性が悪化して成形品の精密成形に対する大きな障害となる。 However, the resin injected from the gate fills the web, boss, rim, etc. on one side of the resin molded part along the surface of the metal insert, and then wraps around the back side of the metal insert to form the resin molded part on the other side. The resin flow is uneven and uneven, and the time required for molding from the start to the end of resin injection and the flow distance of the resin become longer. There was a problem that non-uniform filling was caused and good dimensional accuracy could not be obtained. Moreover, when the resin flow path of the resin molding part in a metal mold | die is narrow, flow resistance becomes large and a moldability deteriorates and becomes a big obstacle with respect to the precision shaping | molding of a molded article.

かかる課題を解決する技術としては、特許文献１に記載された技術があり、出願人によって実用化されている。当該技術においては、ウェブに同心円状に設けられるゲート位置に対向する位置に、インサート部材に貫通穴を穿設して、該貫通孔により、ゲートから射出した樹脂がインサート部材の表側と裏側に流動して樹脂成形部を形成することにより、良好な寸法精度を維持しながら剛性を向上させた成形品を得ることができる。
特開２００２−３４７０８１号公報 As a technique for solving such a problem, there is a technique described in Patent Document 1, which has been put into practical use by the applicant. In this technique, a through hole is formed in the insert member at a position opposite to the gate position provided concentrically on the web, and the resin injected from the gate flows to the front side and the back side of the insert member through the through hole. By forming the resin molded portion, it is possible to obtain a molded product with improved rigidity while maintaining good dimensional accuracy.
JP 2002-347081 A

しかしながら、特許文献１に記載された技術においてもなお、図６に示すように、射出された樹脂がインサート部材９２の表側と裏側に均一に回り込むことができず、成形品の寸法精度が悪化するなどの成形不良を起こすことがあった。例えば、図６に示すように、ゲート９１から射出された溶融樹脂が、ゲートと反対側の面（裏面）には、ゲート側の面（表面）よりも遅れて達し（左側図）、そのため、ウェブ部分のキャビティ９３内に広がっていくのが裏面側では相対的に遅くなってしまい、表面と裏面との樹脂の充填状況の差異によって、インサート部材９２が面外方向に変形してしまうことがある（右側図）。かかる状態で樹脂歯車の射出成形が行われると、面外方向に弾性変形したインサート部材の復元力によって樹脂歯車が変形してしまい、良好な寸法精度を維持できなくなったり、あるいは、インサート部材の面外変形が著しい場合には、インサート部材９２がウェブ表面に露出したりして、成形不良となる。 However, even in the technique described in Patent Document 1, as shown in FIG. 6, the injected resin cannot uniformly wrap around the front side and the back side of the insert member 92, and the dimensional accuracy of the molded product deteriorates. In some cases, molding defects such as For example, as shown in FIG. 6, the molten resin injected from the gate 91 reaches the surface (back surface) opposite to the gate later than the surface (front surface) on the gate side (left side view). Spreading in the cavity 93 of the web portion is relatively slow on the back surface side, and the insert member 92 may be deformed in the out-of-plane direction due to the difference in the resin filling state between the front surface and the back surface. Yes (right side). If injection molding of the resin gear is performed in such a state, the resin gear is deformed by the restoring force of the insert member elastically deformed in the out-of-plane direction, and it becomes impossible to maintain good dimensional accuracy, or the surface of the insert member When the external deformation is significant, the insert member 92 is exposed on the web surface, resulting in molding failure.

また、ウェブとインサート部材の配置によっては、逆に、ゲートと反対側の面の方が、ゲート側の面よりも、溶融樹脂の充填が速くなることもあり、その場合も、同様に精度劣化や成形不良の原因となるため、表面側と裏面側の樹脂充填の速度を均一化して、樹脂成形品の成形不良や精度劣化を防止することが望まれていた。 In addition, depending on the arrangement of the web and the insert member, on the contrary, the surface opposite to the gate may be filled faster with the molten resin than the surface on the gate side. Therefore, it has been desired to make the resin filling speed uniform on the front surface side and the back surface side to prevent molding defects and accuracy deterioration of the resin molded product.

従って、本発明の目的は、良好な寸法精度を維持しつつ剛性を向上した成形品であって、インサート部材と樹脂部材とをインサート成形により一体化した環状樹脂成形品を提供することにある。 Accordingly, an object of the present invention is to provide a molded product having improved rigidity while maintaining good dimensional accuracy, and an annular resin molded product in which an insert member and a resin member are integrated by insert molding.

発明者は、鋭意検討の結果、成型品軸方向から見て貫通穴を覆うような形状にウェブから突出あるいは凹入するような流れ制御部を設けると、インサート部材の表側と裏側の樹脂流れを均一に調整できることを知見し、本発明を完成させた。 As a result of intensive studies, the inventor provided a flow control unit that protrudes or recessed from the web into a shape that covers the through hole when viewed from the axial direction of the molded product, and the resin flow on the front and back sides of the insert member is reduced. The present invention was completed by finding that it can be adjusted uniformly.

本発明は、樹脂成形部が、ウェブ、ウェブの内周部に形成されるボスおよびウェブの外周部に形成されるリムとからなり、ウェブ表面に同心円上に略等間隔に設けられた複数のゲートから射出成形されるとともに、少なくとも前記ウェブ内に前記ゲートに対向する部位に貫通孔を穿設したインサート部材を埋設し、前記インサート部材の周囲に前記樹脂成形部を一体的に形成した環状樹脂成形品において、環状樹脂成形品の軸方向から見て貫通穴を覆うような形状でウェブから突出あるいは凹入する流れ制御部をウェブに設けたことを特徴とする環状樹脂成形品である。 In the present invention, the resin molded portion is composed of a web, a boss formed on the inner peripheral portion of the web, and a rim formed on the outer peripheral portion of the web, and a plurality of the resin molded portions provided on the web surface at substantially equal intervals on a concentric circle An annular resin that is injection-molded from a gate, has an embedded insert member having a through-hole formed in at least a portion of the web facing the gate, and integrally forms the resin molding portion around the insert member In the molded product, the annular resin molded product is characterized in that the web is provided with a flow control unit that protrudes or is recessed from the web in a shape that covers the through hole when viewed from the axial direction of the cyclic resin molded product.

また、本発明においては、流れ制御部が環状樹脂成形品の軸方向から見て円形状に設けられることが好ましく（請求項２）、さらに、流れ制御部が環状樹脂成形品の軸方向から見て貫通孔と同心円状に設けられることが好ましい（請求項３）。 In the present invention, the flow control unit is preferably provided in a circular shape when viewed from the axial direction of the annular resin molded product (Claim 2), and the flow control unit is viewed from the axial direction of the cyclic resin molded product. And preferably provided concentrically with the through hole.

本発明によれば、ウェブ肉厚内に金属インサートを埋設した環状樹脂成形品であっても、金属インサートの表裏両面での樹脂の流れを確実に制御してほぼ均等に樹脂を充填・成形収縮させることができ、インサート部材の面外変形を抑制し、成形不良を防止するとともに、環状樹脂成形品の寸法精度を良好に維持して、剛性が高いにもかかわらず高精度な環状樹脂成形品を得ることができる。 According to the present invention, even in the case of an annular resin molded product in which a metal insert is embedded in the web wall thickness, the resin flow on both the front and back surfaces of the metal insert is reliably controlled, and the resin is almost uniformly filled / molded and contracted. Highly accurate annular resin molded product despite high rigidity while suppressing the out-of-plane deformation of the insert member, preventing defective molding, and maintaining good dimensional accuracy of the annular resin molded product Can be obtained.

また、流れ制御部を円形状に設ければ（請求項２）、成形金型の調整が行いやすくなり、高精度の樹脂歯車を得るための労力が節約される。さらに、流れ制御部を貫通孔と同心円状に設ければ（請求項３）、得られる環状樹脂成形品の精度をさらに高めることができる。 If the flow control unit is provided in a circular shape (Claim 2), the mold can be easily adjusted, and labor for obtaining a highly accurate resin gear can be saved. Furthermore, if the flow control part is provided concentrically with the through hole (Claim 3), the accuracy of the obtained annular resin molded product can be further increased.

本発明の環状樹脂成形品の実施形態としては外歯歯車やプーリーなどの円盤状成形品が挙げられるが、以下、外歯歯車を例として、図面を参照しながら本発明の実施形態を説明する。 Embodiments of the annular resin molded product of the present invention include disk-shaped molded products such as external gears and pulleys. Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking the external gear as an example. .

図１は、本発明による環状樹脂成形品を外歯歯車に応用した一実施例について、その表面側及び裏面側の平面形状、およびそのＡ−Ａ断面構造を示す図である。 FIG. 1 is a diagram showing a planar shape of a front surface side and a back surface side of an annular resin molded product according to the present invention applied to an external gear, and its AA cross-sectional structure.

本実施例における合成樹脂歯車１１は、樹脂成形部として、図示しない回転軸がその軸孔に一体的に嵌着される中空円筒状のボス１２と、このボス１２の外周からその半径方向に延びる回転軸方向に肉抜きされた円環状のウェブ１３と、このウェブ１３の外周から半径方向に広がる円環状のリム１４とからなり、リム１４の外周には所定ピッチの歯部１５が形成されている。そして、インサート部材として、図２に示すような貫通孔２２を有するドーナツ状の金属インサートプレート２１が上記樹脂成形部の射出成形時に、ウェブ１３の内部にインサートされている。 The synthetic resin gear 11 according to the present embodiment includes a hollow cylindrical boss 12 in which a rotation shaft (not shown) is integrally fitted in the shaft hole as a resin molded portion, and extends radially from the outer periphery of the boss 12. An annular web 13 that is thinned in the rotation axis direction and an annular rim 14 that spreads radially from the outer periphery of the web 13, and tooth portions 15 having a predetermined pitch are formed on the outer periphery of the rim 14. Yes. As the insert member, a donut-shaped metal insert plate 21 having a through-hole 22 as shown in FIG. 2 is inserted into the web 13 during the injection molding of the resin molding part.

上記合成樹脂歯車１１は、射出成形時にウェブ１３表面に同心円上に略等間隔に設けられた６点のゲート３１から図示しない成形金型のキャビティ内に注入され、各ゲート３１を中心にして放射状に広がる溶融樹脂により形成されるが、金属インサートプレート２１の周方向に沿って各ゲート３１に対向して穿設された複数の貫通孔２２を直ちに通過して裏面側のキャビティにも表面側と同様に樹脂が速やかに充填される。 The synthetic resin gear 11 is injected into a cavity of a molding die (not shown) from six gates 31 provided on the surface of the web 13 at substantially equal intervals on the surface of the web 13 at the time of injection molding. However, it immediately passes through a plurality of through holes 22 formed so as to face the gates 31 along the circumferential direction of the metal insert plate 21, and the cavity on the back side also has a surface side. Similarly, the resin is quickly filled.

本実施例における合成樹脂歯車においては、さらに、ウェブ１３のゲート３１が設けられる面（表面）とは反対側の面（裏面）には、ゲート３１および貫通孔２２と対向する位置に、歯車軸方向から見て貫通孔２２全体を覆うように貫通孔よりも大径の円形状を有する流れ制御部１６が、短円柱状にウェブ１３から突き出すような形状で設けられている。 In the synthetic resin gear in the present embodiment, the gear shaft is located on the surface (back surface) opposite to the surface (front surface) on which the gate 31 of the web 13 is provided, at a position facing the gate 31 and the through hole 22. A flow control unit 16 having a circular shape larger in diameter than the through hole is provided in a shape that protrudes from the web 13 in a short column shape so as to cover the entire through hole 22 when viewed from the direction.

本実施例においては、流れ制御部１６を設けたことによって、ゲート３１側からウェブ裏面側のキャビティの入り口が比較的広く設けられるようになるので、ウェブ裏面側への溶融樹脂の供給を促進することができる。従って、従来技術の樹脂歯車において、図６に示したようにウェブ表側の樹脂供給が速く、ウェブ裏面側の樹脂供給が遅くなるような場合に、本実施例のような流れ制御部１６を設けることにより、図３にゲート付近の拡大断面図として示すように、ウェブ表面とウェブ裏面との樹脂供給の速度差を補償することができ、金属インサートプレート２１の表裏両面側において、各ゲート３１から流入する樹脂のリム１４やその外周の歯部１５に到達する時間差を均一化して、金属インサートプレート２１の面外変形を未然に防止するあるいは抑制するとともに、樹脂冷却の熱履歴に差が生じなくすることができ、成形品の精度劣化や成形不良を防止することができる。 In this embodiment, since the flow control unit 16 is provided, the entrance of the cavity on the back side of the web from the gate 31 side becomes relatively wide, so the supply of molten resin to the back side of the web is promoted. be able to. Accordingly, in the conventional resin gear, as shown in FIG. 6, when the resin supply on the front side of the web is fast and the resin supply on the back side of the web is slow, the flow control unit 16 as in this embodiment is provided. Thus, as shown in an enlarged cross-sectional view in the vicinity of the gate in FIG. 3, it is possible to compensate for the difference in the resin supply speed between the web surface and the back surface of the web. The time difference to reach the inflowing resin rim 14 and the teeth 15 on the outer periphery thereof is made uniform to prevent or suppress the out-of-plane deformation of the metal insert plate 21, and there is no difference in the heat history of resin cooling. It is possible to prevent deterioration in accuracy and molding failure of the molded product.

特に、本発明においては、樹脂歯車１１の軸方向から見て、貫通孔２２全体を覆うように流れ制御部１６を設けているので、表面と裏面の溶融樹脂の流れのコントロールを非常に効果的に行うことができ、流れ制御部の直径や高さを変更することにより、裏面側のキャビティへの樹脂の流れやすさを調整し、表面と裏面の流れ速度の均一化を容易に図ることができる。 In particular, in the present invention, since the flow control unit 16 is provided so as to cover the entire through-hole 22 when viewed from the axial direction of the resin gear 11, it is very effective to control the flow of the molten resin on the front and back surfaces. By changing the diameter and height of the flow control unit, it is possible to adjust the ease of resin flow into the cavity on the back side, and to easily make the flow velocity on the front and back sides uniform. it can.

また、本実施形態においては、軸方向から見て円形状を有する流れ制御部１６が円柱状に突出して設けられているため、成形金型の調整もしやすい。すなわち、ウェブ表面と裏面の樹脂の流れを均一化すべく、流れ制御部１６の径や高さを調整する場合には、成形金型の流れ制御部１６を形成する部分が単純な円柱形状穴であるため、拡径や穴を深くする加工が簡単であり、金型の調整が行いやすい。 Moreover, in this embodiment, since the flow control part 16 which has circular shape seeing from an axial direction is provided protruding in the column shape, it is easy to adjust a molding die. That is, when adjusting the diameter and height of the flow control unit 16 in order to make the flow of the resin on the front and back surfaces of the web uniform, the part forming the flow control unit 16 of the molding die is a simple cylindrical hole. Therefore, it is easy to expand the diameter and deepen the hole, and it is easy to adjust the mold.

さらに、本実施形態においては、樹脂歯車１１の軸方向から見て、貫通孔２２と同心円状に円柱状の流れ制御部１６を設けている。流れ制御部１６を貫通孔２２と同心円状に設けることは本発明の必須要件ではないが、そのようにすれば、ゲート３１位置から、ウェブ１３全体に均一に樹脂を広げることができ、高精度な射出成形品の製造に好適である。 Further, in the present embodiment, the cylindrical flow control unit 16 is provided concentrically with the through hole 22 when viewed from the axial direction of the resin gear 11. Although it is not an essential requirement of the present invention to provide the flow control unit 16 concentrically with the through-hole 22, by doing so, it is possible to spread the resin uniformly from the position of the gate 31 to the entire web 13, and high accuracy. It is suitable for manufacturing a simple injection molded product.

以上、図示実施例につき説明したが、本発明は上記実施例の態様のみに限定されるものでなく、種々の改変をして実施することができる。以下に本発明の他の実施形態について説明するが、以下の説明においては、上記実施形態と異なる部分を中心に説明し、同様である部分についてはその説明を省略する。 As described above, the illustrated embodiment has been described. However, the present invention is not limited to the embodiment described above, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above-described embodiment will be mainly described, and descriptions of the same portions will be omitted.

上記実施形態では、環状樹脂成形品として外歯歯車１１について説明したが、本発明の環状樹脂成形品としては歯車のほか、円周カム、プーリー、ウォーム等であってもよく、また、歯車も平歯車形態に限られず傘歯車、はすば歯車等の形態であってもよい。 In the above embodiment, the external gear 11 has been described as an annular resin molded product. However, the annular resin molded product of the present invention may be a gear, a circumferential cam, a pulley, a worm, or the like. It is not limited to a spur gear form, and may be a bevel gear, a helical gear, or the like.

また、流れ制御部１６の形状は、上記形状に限られず、例えば、図４に示すように、ゲート３１に対向する貫通孔２２を覆うような円形断面を有する円柱状窪み部分によって流れ制御部１６’を形成しても良い。流れ制御部を設けていないときの環状樹脂成形品のウェブ表側の樹脂供給が遅く、ウェブ裏面側の樹脂供給が速いような場合には、図４に示すような流れ制御部１６’を設けることにより、ウェブ表面とウェブ裏面との樹脂供給の速度の差を補償し、均一化することができ、同様の効果を発揮できる。すなわち、本発明の流れ制御部は、環状樹脂成形品の軸方向から見て、貫通孔２２を覆うような形状でウェブから突出または凹入する形状であれば良く、流れ制御部が突出するか凹入するかは特に限定されるものではない。 Further, the shape of the flow control unit 16 is not limited to the above shape, and for example, as shown in FIG. 4, the flow control unit 16 is formed by a cylindrical depression having a circular cross section that covers the through hole 22 facing the gate 31. 'May be formed. When the resin supply on the web front side of the annular resin molded product is slow and the resin supply on the web back side is fast when the flow control unit is not provided, a flow control unit 16 ′ as shown in FIG. 4 is provided. Thus, the difference in the resin supply speed between the web surface and the web back surface can be compensated and uniformed, and the same effect can be exhibited. That is, the flow control unit of the present invention may be any shape that covers or protrudes from the web in a shape that covers the through-hole 22 when viewed from the axial direction of the annular resin molded product. There is no particular limitation as to whether or not it is recessed.

この実施形態においても、流れ制御部１６’の形状を円柱状の窪み部分で形成されるようにすれば、成形金型の改修・調整時に、流れ制御部１６’の径や深さの変更を容易に行うことができ、より好ましい。すなわち、流れ制御部は、環状樹脂成形品の軸方向から見て、円形状に設けられていることが好ましい。なお、流れ制御部を軸方向から見て、円形状に設けることは必須ではないので、樹脂の流れの調整上の要件などに応じて、流れ制御部を楕円や四角形、あるいは円環状に設けても良い。 Also in this embodiment, if the shape of the flow control unit 16 ′ is formed of a cylindrical depression, the diameter and depth of the flow control unit 16 ′ can be changed when the molding die is modified or adjusted. It can be easily performed and is more preferable. That is, the flow control unit is preferably provided in a circular shape when viewed from the axial direction of the annular resin molded product. In addition, since it is not essential to provide the flow control unit in a circular shape when viewed from the axial direction, the flow control unit is provided in an ellipse, a quadrangle, or an annular shape in accordance with the requirements for adjustment of the resin flow. Also good.

さらに、図５には、流れ制御部の構成に関し、さらに他の実施形態を示す。本実施形態においては、流れ制御部１７は、ウェブ１３のゲート３１が設けられた側すなわち表面側に、貫通孔２２を覆うような円形断面を有する窪み形状に設けられている。本実施形態においても、流れ制御部１７の働きにより、ウェブのゲートが設けられた面（表面）側の樹脂流れ速度が抑えられて、ウェブ表面とウェブ裏面との樹脂供給の速度を均一化することができ、高精度の樹脂歯車を得ることができる。 Further, FIG. 5 shows still another embodiment regarding the configuration of the flow control unit. In the present embodiment, the flow control unit 17 is provided in a concave shape having a circular cross section that covers the through hole 22 on the side of the web 13 where the gate 31 is provided, that is, on the surface side. Also in the present embodiment, the flow control unit 17 functions to suppress the resin flow speed on the surface (front surface) side on which the web gate is provided, and uniformize the resin supply speed between the web surface and the web back surface. And a highly accurate resin gear can be obtained.

このように、流れ制御部は、ウェブの表面側（ゲートが設けられた面側）、ウェブの裏面側（ゲートとは反対側）のいずれに設けても良く、ウェブ表面とウェブ裏面との樹脂供給の速度が均一化されるように、円柱状に突出させたり、凹入させ（窪ませ）たりして樹脂の流れを調整すればよい。 As described above, the flow control unit may be provided on either the front side of the web (the side where the gate is provided) or the back side of the web (the side opposite to the gate). What is necessary is just to adjust the flow of resin by making it protrude in a column shape or making it indent (dent) so that the speed | rate of supply may be equalized.

本発明の環状樹脂成形品によれば、環状樹脂成形品の寸法精度を良好に維持して、剛性が高いにもかかわらず高精度な環状樹脂成形品を得ることができ、ＯＡ機器などに活用できてその利用価値が高い。 According to the cyclic resin molded product of the present invention, the dimensional accuracy of the cyclic resin molded product can be maintained satisfactorily, and a highly accurate cyclic resin molded product can be obtained despite its high rigidity. It is possible to use it.

本発明の第１の実施形態を示す図である。It is a figure which shows the 1st Embodiment of this invention. ウェブに埋設されるインサート部材を示す正面図である。It is a front view which shows the insert member embed | buried under a web. 本発明の第１の実施形態おける溶融樹脂の流れを示す図である。It is a figure which shows the flow of the molten resin in the 1st Embodiment of this invention. 本発明における流れ制御部の他の実施形態を示す図である。It is a figure which shows other embodiment of the flow control part in this invention. 本発明における流れ制御部のさらに他の実施形態を示す図である。It is a figure which shows other embodiment of the flow control part in this invention. 従来例における溶融樹脂の流れを示す図である。It is a figure which shows the flow of the molten resin in a prior art example.

符号の説明Explanation of symbols

１１ 環状樹脂成形品（合成樹脂製外歯歯車）
１２ ボス
１３ ウェブ
１４ リム
１５ 歯部
１６、１６’ 流れ制御部
１７ 流れ制御部
２１ インサート部材
２２ 貫通孔
３１ 樹脂の射出ゲート 11 Annular resin molded product (synthetic resin external gear)
12 Boss 13 Web 14 Rim 15 Teeth 16, 16 ′ Flow Control Unit 17 Flow Control Unit 21 Insert Member 22 Through-hole 31 Resin Injection Gate

Claims (3)

樹脂成形部が、ウェブ、ウェブの内周部に形成されるボスおよびウェブの外周部に形成されるリムとからなり、ウェブ表面に同心円上に略等間隔に設けられた複数のゲートから射出成形されるとともに、少なくとも前記ウェブ内に前記ゲートに対向する部位に貫通孔を穿設したインサート部材を埋設し、前記インサート部材の周囲に前記樹脂成形部を一体的に形成した環状樹脂成形品において、
環状樹脂成形品の軸方向から見て貫通穴を覆うような形状でウェブから突出あるいは凹入する流れ制御部をウェブに設けたことを特徴とする環状樹脂成形品。 The resin molding part consists of a web, a boss formed on the inner peripheral part of the web, and a rim formed on the outer peripheral part of the web, and injection molding from a plurality of gates provided on the web surface at substantially equal intervals on a concentric circle. In addition, in an annular resin molded product in which an insert member having a through hole formed at least in a portion facing the gate in the web is embedded, and the resin molded portion is integrally formed around the insert member,
An annular resin molded product characterized in that a flow control unit is provided on the web so as to protrude or dent from the web in a shape that covers the through hole when viewed from the axial direction of the annular resin molded product. 流れ制御部が環状樹脂成形品の軸方向から見て円形状に設けられたことを特徴とする請求項１に記載の環状樹脂成形品。 The annular resin molded product according to claim 1, wherein the flow control unit is provided in a circular shape when viewed from the axial direction of the cyclic resin molded product. 流れ制御部が環状樹脂成形品の軸方向から見て貫通孔と同心円状に設けられたことを特徴とする請求項２に記載の環状樹脂成形品。 The annular resin molded product according to claim 2, wherein the flow control unit is provided concentrically with the through hole when viewed from the axial direction of the cyclic resin molded product.
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JP2013127267A (en) * 2011-12-16 2013-06-27 Honda Motor Co Ltd Gear, worm gear mechanism with the gear, and electric power steering apparatus with the worm gear mechanism
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