JP4442868B2 - Resin gear - Google Patents

Resin gear Download PDF

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JP4442868B2
JP4442868B2 JP2004105949A JP2004105949A JP4442868B2 JP 4442868 B2 JP4442868 B2 JP 4442868B2 JP 2004105949 A JP2004105949 A JP 2004105949A JP 2004105949 A JP2004105949 A JP 2004105949A JP 4442868 B2 JP4442868 B2 JP 4442868B2
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gear
shaft member
resin
fitting
gear portion
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JP2005291323A (en
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昭博 上辻
彰弘 立見
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Daihatsu Motor Co Ltd
Starlite Co Ltd
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Daihatsu Motor Co Ltd
Starlite Co Ltd
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Description

本発明は、金属製軸部材に樹脂製歯車部を射出成形により形成した樹脂歯車に関する。   The present invention relates to a resin gear in which a resin gear portion is formed on a metal shaft member by injection molding.

トルク伝達部材として採用される樹脂歯車では、図６（ａ）に示すように、金属製軸部材３０に樹脂製歯車部３１を射出成形により形成するのが一般的である。ところで、歯車部３１を射出成形する場合、該歯車部３１の肉厚等に起因したひけ３２が生じるおそれがあり、歯車部３１の寸法精度が悪化するという問題がある。   In a resin gear employed as a torque transmission member, as shown in FIG. 6A, a resin gear portion 31 is generally formed on a metal shaft member 30 by injection molding. By the way, when the gear part 31 is injection-molded, there is a possibility that sink marks 32 may be generated due to the thickness of the gear part 31, and the dimensional accuracy of the gear part 31 is deteriorated.

このようなひけの発生を防止するには、図６（ｂ）に示すように、歯車部３１に軸方向に延びるぬすみ３３を周方向に所定間隔をあけて形成したり、あるいは図６（ｃ）に示すように、軸部材３０の樹脂成形部３０ａの径を大きくして歯車部３１の肉厚を小さくしたりすることが考えられる。   In order to prevent the occurrence of such sink marks, as shown in FIG. 6B, a thinning 33 extending in the axial direction is formed in the gear portion 31 at a predetermined interval in the circumferential direction, or FIG. It is conceivable to increase the diameter of the resin molded portion 30a of the shaft member 30 and reduce the thickness of the gear portion 31 as shown in FIG.

一方、樹脂歯車のトルク伝達力を高める観点から、金属製軸部材に金属製接合部材を圧入により接合し、該接合部材を介して軸部材と樹脂製歯車部とを結合することにより、軸部材から接合部材を介して歯車部にトルクを伝達する場合がある（例えば、特許文献１参照）。
特開２００２−３０３３６２号公報 On the other hand, from the viewpoint of increasing the torque transmission force of the resin gear, by joining the metal joint member to the metal shaft member by press-fitting and connecting the shaft member and the resin gear portion via the joint member, the shaft member is obtained. In some cases, torque is transmitted to the gear portion from the joint to the gear portion (see, for example, Patent Document 1).
JP 2002-303362 A

しかしながら、上記従来の歯車部にぬすみを形成する構造では、金型に薄肉のぬすみ部を形成する必要があり、繰り返しの使用によってぬすみ部が損傷し易く、型寿命が短くなるとともに、金型の構造が複雑となるという問題がある。また上記軸部材の径を大きくする構造では、樹脂歯車全体の重量が増えるという問題がある。   However, in the conventional structure in which the gear portion is formed with a thin portion, it is necessary to form a thin portion of the thin portion in the mold, and the thin portion is easily damaged by repeated use, and the mold life is shortened. There is a problem that the structure becomes complicated. Further, the structure in which the diameter of the shaft member is increased has a problem that the weight of the entire resin gear increases.

また、上記従来の軸部材と歯車部とを金属製接合部材を介して結合する構造を採用した場合には、接合部材が金属であることから、樹脂歯車全体の重量が増えるという問題がある。   Moreover, when the structure which couple | bonds the said conventional shaft member and gear part via a metal joining member is employed, since the joining member is a metal, there exists a problem that the weight of the whole resin gear increases.

本発明は、上記従来の状況に鑑みてなされたもので、型構造の複雑化や重量の増加を招くことなくひけの発生を防止できるとともに、トルク伝達力を確保できる樹脂歯車を提供することを目的としている。   The present invention has been made in view of the above-described conventional situation, and provides a resin gear that can prevent the occurrence of sink without causing a complicated mold structure and an increase in weight, and can secure a torque transmission force. It is aimed.

請求項１の発明は、金属製軸部材を囲むように樹脂製歯車部を射出成形してなる樹脂歯車において、上記歯車部内に、樹脂製インサート部材を埋設し、該インサート部材を、上記軸部材の外周面の少なくとも一部に嵌合する嵌合部と、該嵌合部の外周面に一体形成され、軸方向長さが上記嵌合部より長い幅広部とを有するものとし、該幅広部と上記軸部材との間には隙間が形成されており、上記幅広部に、軸方向に延び、該幅広部の外周側と上記隙間とを連通させる複数の内外連通スリットを形成し、上記歯車部を構成する樹脂の一部は、上記内外連通スリット及び上記隙間に充填されており、上記軸部材の外周面の、上記歯車部の上記隙間部分が当接する部分に凹凸を形成したことを特徴としている。 The invention of claim 1 is a resin gear formed by injection molding a resin gear portion so as to surround a metal shaft member. A resin insert member is embedded in the gear portion, and the insert member is connected to the shaft member. A fitting portion that fits into at least a part of the outer peripheral surface, and a wide portion that is integrally formed on the outer peripheral surface of the fitting portion and that has an axial length longer than the fitting portion. A gap is formed between the shaft member and the shaft member, and a plurality of internal and external communication slits are formed in the wide portion so as to extend in the axial direction and connect the outer peripheral side of the wide portion and the clearance. Part of the resin constituting the part is filled in the inner and outer communication slits and the gap, and irregularities are formed on the outer peripheral surface of the shaft member where the gap part of the gear part abuts. It is said.

請求項１の発明に係る樹脂歯車によれば、歯車部内に、軸部材に嵌合する嵌合部と、該嵌合部より軸方向に長く延びる幅広部を有する樹脂製インサート部材を埋設したので、歯車部に肉厚に起因したひけが発生するのを防止することができ、歯車部の寸法精度を確保することができる。その結果、従来の金型に薄肉のぬすみ部を形成する場合に比べて型寿命を延長できるとともに、型構造を簡単にできる。また樹脂製インサート部材を埋設する構造であるので、従来の軸部材を大径にしたり，金属製接合部材を介在させたりする場合に比べて重量を低減できる。   According to the resin gear according to the first aspect of the present invention, the resin insert member having the fitting portion fitted to the shaft member and the wide portion extending in the axial direction from the fitting portion is embedded in the gear portion. Further, it is possible to prevent sink marks due to the wall thickness from occurring in the gear portion, and to ensure the dimensional accuracy of the gear portion. As a result, the mold life can be extended and the mold structure can be simplified as compared with the case where a thin thin portion is formed in a conventional mold. Further, since the resin insert member is embedded, the weight can be reduced as compared with the case where the conventional shaft member has a large diameter or a metal joining member is interposed.

またインサート部材の嵌合部を幅広部より軸方向に短くしたので、幅広部と軸部材との隙間に歯車部が入り込み、それだけ軸部材と歯車部との接触面積を増やすことができ、両者を強固に固着できる。   Moreover, since the fitting part of the insert member is made shorter in the axial direction than the wide part, the gear part enters the gap between the wide part and the shaft member, and the contact area between the shaft member and the gear part can be increased accordingly, Can be firmly fixed.

本発明では、内外連通スリットと軸外周部に囲まれた樹脂歯車部が当接する軸部分に凹凸部を形成したので、軸部材と歯車部との嵌合力及び接合面積を増やすことができ、両者をより一層強固に固着することができ、重量の増加を招くことなく所望のトルク伝達力を確保することができる。 In the present invention, since the concavo-convex portion is formed in the shaft portion where the resin gear portion surrounded by the inner and outer communication slits and the outer peripheral portion of the shaft abuts, the fitting force and the joint area between the shaft member and the gear portion can be increased. Can be more firmly fixed, and a desired torque transmission force can be secured without causing an increase in weight.

本発明では、インサート部材の幅広部に複数の内外連通スリットを形成したので、インサート部材と歯車部との接合面積を増やすことができ、両者の密着結合性をより一層高めることができ、歯車部全体の剛性を向上できる。
 In the present invention , since a plurality of internal and external communication slits are formed in the wide portion of the insert member, the joint area between the insert member and the gear portion can be increased, and the tightness of both can be further enhanced, and the gear portion Overall rigidity can be improved.

また上記各スリットを介して成形樹脂が軸部材とインサート部材との間に回り込み易くなり、成形樹脂を均一に充填することができ、歯車部の精度及び品質を高めることができる。   Further, the molding resin can easily flow between the shaft member and the insert member through the slits, and the molding resin can be uniformly filled, and the accuracy and quality of the gear portion can be improved.

以下、本発明の実施の形態を添付図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１及び図２は、本発明の一実施形態による樹脂歯車を説明するための図であり、図１は樹脂歯車の断面図、図２（ａ）〜図２（ｄ）はそれぞれ樹脂製インサート部材の正面図，側面図，背面図，断面側面図（図２（ｃ）のIIｄ−IIｄ線断面図）である。   1 and 2 are views for explaining a resin gear according to an embodiment of the present invention. FIG. 1 is a sectional view of the resin gear, and FIGS. 2 (a) to 2 (d) are resin inserts. It is the front view of a member, a side view, a rear view, and a cross-sectional side view (IId-IId sectional view taken on the line of FIG.2 (c)).

図において、１は例えば乾式のトルク伝達部材として採用される樹脂歯車を示しており、これは棒状の金属製軸部材２の軸端部２ａの外周面に平歯車を構成する樹脂製歯車部３を射出成形により形成してなるものである。この樹脂歯車１は、例えば、軸部材２の軸長さが１４０ｍｍ程度、歯車部３の直径が３５ｍｍ程度で、重量が１３０ｇ程度のものである。 In the figure, reference numeral 1 denotes a resin gear employed as, for example, a dry torque transmission member, which is a resin gear portion 3 constituting a spur gear on the outer peripheral surface of a shaft end portion 2a of a rod-shaped metal shaft member 2. Is formed by injection molding. In the resin gear 1, for example, the shaft member 2 has an axial length of about 140 mm, the gear portion 3 has a diameter of about 35 mm, and a weight of about 130 g.

上記歯車部３には該歯車部３と同じ材料からなる樹脂製インサート部材４が埋設されている。このインサート部材４は歯車部３とは別工程にて形成されたものである。即ち、上記歯車部３は、予め形成されたインサート部材４を軸部材２に嵌合装着して金型５にセットし、この状態で射出成形されたものである。この金型５は、下型６とこれに開閉可能に配置された上型７とで上記歯車部３に対応した形状のキャビティ７ｃを形成してなるものである。上記該キャビティ７ｃには各ゲート７ｂを介してスプル７ａが連通接続されている。   A resin insert member 4 made of the same material as that of the gear portion 3 is embedded in the gear portion 3. The insert member 4 is formed in a separate process from the gear portion 3. That is, the gear portion 3 is formed by injection molding in this state by fitting and mounting a preformed insert member 4 to the shaft member 2 and setting it in the mold 5. The mold 5 is formed by forming a cavity 7c having a shape corresponding to the gear portion 3 with a lower mold 6 and an upper mold 7 arranged to be openable and closable. A sprue 7a is connected to the cavity 7c through each gate 7b.

上記インサート部材４は、上記軸部材２の軸端部２ａの外周面全面に嵌合装着された円筒状の嵌合部４ａと、これの外周面に一体形成された円筒状の幅広部４ｂとを有している。この嵌合部４ａには上記軸端部２ａの軸方向中央部が嵌合挿入される嵌合孔４ａ′が形成されている。なお上記嵌合部４ａは軸部材２に対して軸方向への移動を阻止する程度の緩く嵌合させれば良いが、圧入により強固に嵌合させてもよい。 The insert member 4 includes a cylindrical fitting portion 4a fitted and mounted on the entire outer peripheral surface of the shaft end portion 2a of the shaft member 2, and a cylindrical wide portion 4b integrally formed on the outer peripheral surface thereof. have. The fitting portion 4a is formed with a fitting hole 4a 'into which the axial center portion of the shaft end portion 2a is fitted and inserted. The fitting portion 4a may be loosely fitted to the shaft member 2 so as to prevent movement in the axial direction, but may be firmly fitted by press fitting.

上記幅広部４ｂは上記嵌合部４ａより軸方向に長く形成されており、また該幅広部４ｂの外周面は上記歯車部３の歯元面３ａに近接している。このようにして幅広部４ｂと軸部材２との間には隙間ｓが形成されている。   The wide portion 4b is formed longer in the axial direction than the fitting portion 4a, and the outer peripheral surface of the wide portion 4b is close to the tooth root surface 3a of the gear portion 3. Thus, a gap s is formed between the wide portion 4 b and the shaft member 2.

上記幅広部４ｂの右側端面には軸方向に延びる一対の脚部４ｃが突出形成されている。この各脚部４ｃを上記金型５の下型６の合わせ面６ａに当接することによりインサート部材４の位置決めを行うようになっている。   A pair of leg portions 4c extending in the axial direction is formed on the right end surface of the wide portion 4b. The insert member 4 is positioned by contacting each leg 4c with the mating surface 6a of the lower mold 6 of the mold 5.

また上記幅広部４ｂには該幅広部４ｂの両外縁からそれぞれ軸方向内側に延びる内外連通スリット４ｄが周方向に８つ形成されている。この各連通スリット４ｄにより幅広部４ｂの外側と内側の上記隙間ｓとが連通されている。   The wide portion 4b has eight inner and outer communication slits 4d extending inward in the axial direction from both outer edges of the wide portion 4b. Each communication slit 4d communicates the gap s on the outside and the inside of the wide portion 4b.

上記軸部材２の軸端部２ａの、上記歯車部３が形成される部分、つまり上記嵌合部４ａの左右両側部分には凹凸部２ｂ，２ｂが形成されている。この凹凸部２ｂは例えばローレット加工により形成されたものであり、これにより歯車部３との嵌合力及び接触面積を増やしている。   Concave and convex portions 2b and 2b are formed on the shaft end portion 2a of the shaft member 2 where the gear portion 3 is formed, that is, on both the left and right portions of the fitting portion 4a. The uneven portion 2b is formed by, for example, knurling, and thereby increases the fitting force with the gear portion 3 and the contact area.

上記樹脂歯車１を射出成形するには、予め形成されたインサート部材４を軸部材２に嵌合装着し、該軸部材２を金型５にセットし、各スプル７ａからゲート７ｂを介してキャビティ７ｃ内に成形樹脂を注入する。すると成形樹脂がインサート部材４の各連通スリット４ｄを通って幅広部４ｂと軸部材２との隙間ｓに流入しつつキャビティ７ｃ内全域に充填される。しかる後、金型５を開いて各ゲート７ｂをカットし、これにより歯車部３が形成される。   In order to injection mold the resin gear 1, a preformed insert member 4 is fitted and attached to a shaft member 2, the shaft member 2 is set on a mold 5, and a cavity is formed from each sprue 7 a through a gate 7 b. A molding resin is injected into 7c. Then, the molding resin fills the entire area of the cavity 7 c while flowing into the gap s between the wide portion 4 b and the shaft member 2 through each communication slit 4 d of the insert member 4. Thereafter, the mold 5 is opened to cut each gate 7b, whereby the gear portion 3 is formed.

本実施形態によれば、軸部材２が挿入される嵌合部４ａと、歯車部３の歯元面３ａに近接し、かつ軸方向に延びる幅広部４ｂとを有する樹脂製インサート部材４を歯車部３内に埋設したので、歯車部３に肉厚に起因したひけが発生するのを防止することができ、歯車部３の寸法精度を確保することができる。その結果、従来の薄肉のぬすみ部を形成する場合に比べて金型の寿命を延長できるとともに、金型構造を簡単にできる。   According to the present embodiment, the resin insert member 4 having the fitting portion 4a into which the shaft member 2 is inserted and the wide portion 4b that is close to the tooth root surface 3a of the gear portion 3 and extends in the axial direction is used as the gear. Since it is embedded in the portion 3, it is possible to prevent sinking due to the thickness of the gear portion 3, and to ensure the dimensional accuracy of the gear portion 3. As a result, the life of the mold can be extended and the mold structure can be simplified as compared with the case where a thin thin portion is formed.

また樹脂製インサート部材４を歯車部３内に埋設する構造であるので、従来の軸部材を大径にしたり，金属製接合部材を介在させたりする場合に比べて樹脂歯車１全体の重量を低減できる。さらに上記歯車部３と同じ材料からなるインサート部材４をインサートしたので、歯車部３とインサート部材４との密着性を向上でき、歯車部３の剛性を高めることができる。   Further, since the resin insert member 4 is embedded in the gear portion 3, the overall weight of the resin gear 1 is reduced as compared with the case where the conventional shaft member has a large diameter or a metal joining member is interposed. it can. Furthermore, since the insert member 4 made of the same material as that of the gear portion 3 is inserted, the adhesion between the gear portion 3 and the insert member 4 can be improved, and the rigidity of the gear portion 3 can be increased.

さらに幅広部４ｂと軸部材２との間に隙間ｓを形成したので、該隙間ｓに歯車部３を充填することにより両者２，３の接触面積を増やすことができ、強固に固着することができる。   Further, since the gap s is formed between the wide part 4b and the shaft member 2, the contact area between the two parts 2 and 3 can be increased by filling the gap s with the gear part 3, and can be firmly fixed. it can.

本実施形態では、上記軸部材２の歯車部３の形成部分に凹凸部２ｂを形成したので、軸部材２と歯車部３との嵌合力，接触面積を増やすことができ、それだけ両者２，３をより一層強固に固着することができ、重量の増加を招くことなく所望のトルク伝達力を確保することができる。なお、上述の従来公報では、軸部材からの駆動力を接合部材を介して歯車部に伝達する構造であるのに対して、本実施形態では、軸部材２から歯車部３に直接駆動力を伝達することができる。   In the present embodiment, since the uneven portion 2b is formed in the portion where the gear portion 3 of the shaft member 2 is formed, the fitting force and the contact area between the shaft member 2 and the gear portion 3 can be increased. Can be more firmly fixed, and a desired torque transmission force can be ensured without increasing the weight. In the above-described conventional publication, the driving force from the shaft member is transmitted to the gear portion via the joining member, whereas in the present embodiment, the driving force is directly applied from the shaft member 2 to the gear portion 3. Can communicate.

本実施形態では、上記インサート部材４の幅広部４ｂに軸方向に延びる複数の内外連通スリット４ｄを形成したので、インサート部材４と歯車部３との接合面積を増やすことができ、両者３，４の密着結合性をより一層高めることができ、歯車部３全体の剛性を向上できる。   In the present embodiment, since the plurality of inner and outer communication slits 4d extending in the axial direction are formed in the wide portion 4b of the insert member 4, the joining area between the insert member 4 and the gear portion 3 can be increased. Can be further improved, and the rigidity of the entire gear portion 3 can be improved.

また上記各スリット４ｄを介して成形樹脂が軸部材２と幅広部４ｂとの隙間ｓに回り込み易くなり、成形樹脂を均一に充填することができ、歯車部３の精度及び品質をより一層高めることができる。   Further, the molding resin can easily enter the gap s between the shaft member 2 and the wide portion 4b through the slits 4d, and the molding resin can be uniformly filled, and the accuracy and quality of the gear portion 3 can be further improved. Can do.

なお、上記実施形態では、インサート部材４の嵌合部４ａを軸部材２の周方向全面に嵌合させた場合を説明したが、本発明では、嵌合部を軸部材の周方向の一部，あるいは軸方向の一部に嵌合させてもよく、例えば図３〜図５に示すような各種の変形例が考えられる。   In addition, although the said embodiment demonstrated the case where the fitting part 4a of the insert member 4 was fitted to the whole circumferential direction of the shaft member 2, in this invention, a fitting part is a part of the circumferential direction of a shaft member. Alternatively, it may be fitted to a part in the axial direction. For example, various modifications as shown in FIGS.

図３は、嵌合部４ａを断面形状概ね十字形状とし、このうち対向する２つの嵌合部４ａを軸部材２に嵌合させた例である。なお、各嵌合部４ａを９０度角度ごとに嵌合させてもよい。   FIG. 3 shows an example in which the fitting portion 4 a has a substantially cross-shaped cross section, and two fitting portions 4 a facing each other are fitted to the shaft member 2. In addition, you may fit each fitting part 4a for every 90 degree | times angle.

図４は、インサート部材４の軸方向両端部に嵌合部４ａ，４ａを形成し、一方の嵌合部４ａを軸部材２の周方向全面に嵌合させ、他方の嵌合部４ａを軸部材２の周方向の一部に嵌合させた例である。   In FIG. 4, fitting portions 4 a and 4 a are formed at both axial end portions of the insert member 4, one fitting portion 4 a is fitted to the entire circumferential direction of the shaft member 2, and the other fitting portion 4 a is pivoted. This is an example in which a part of the member 2 in the circumferential direction is fitted.

図５は、インサート部材４の軸方向一端部に嵌合部４ａを形成し、該嵌合部４ａを軸部材２の周方向に嵌合させた例である。   FIG. 5 is an example in which a fitting portion 4 a is formed at one axial end of the insert member 4 and the fitting portion 4 a is fitted in the circumferential direction of the shaft member 2.

本発明の一実施形態による樹脂歯車を説明するための断面図である。It is sectional drawing for demonstrating the resin gear by one Embodiment of this invention. 上記樹脂歯車のインサート部材の図である。It is a figure of the insert member of the said resin gear. 上記インサート部材の第１変形例を示す断面図である。It is sectional drawing which shows the 1st modification of the said insert member. 上記インサート部材の第２変形例を示す断面図である。It is sectional drawing which shows the 2nd modification of the said insert member. 上記インサート部材の第３変形例を示す断面図である。It is sectional drawing which shows the 3rd modification of the said insert member. 従来の一般的な樹脂歯車を示す図である。It is a figure which shows the conventional general resin gearwheel.

符号の説明Explanation of symbols

１ 樹脂歯車
２ 軸部材
２ｂ 凹凸部
３ 歯車部
３ａ 歯元面
４ インサート部材
４ａ 嵌合部
４ｂ 幅広部
４ｄ 内外連通スリット DESCRIPTION OF SYMBOLS 1 Resin gear 2 Shaft member 2b Uneven part 3 Gear part 3a Root surface 4 Insert member 4a Fitting part 4b Wide part 4d Internal / external communication slit

Claims (1)

金属製軸部材を囲むように樹脂製歯車部を射出成形してなる樹脂歯車において、上記歯車部内に、樹脂製インサート部材を埋設し、該インサート部材を、上記軸部材の外周面の少なくとも一部に嵌合する嵌合部と、該嵌合部の外周面に一体形成され、軸方向長さが上記嵌合部より長い幅広部とを有するものとし、該幅広部と上記軸部材との間には隙間が形成されており、上記幅広部に、軸方向に延び、該幅広部の外周側と上記隙間とを連通させる複数の内外連通スリットを形成し、上記歯車部を構成する樹脂の一部は、上記内外連通スリット及び上記隙間に充填されており、上記軸部材の外周面の、上記歯車部の上記隙間部分が当接する部分に凹凸を形成したことを特徴とする樹脂歯車。 In a resin gear formed by injection molding a resin gear portion so as to surround a metal shaft member, a resin insert member is embedded in the gear portion, and the insert member is at least a part of the outer peripheral surface of the shaft member. And a wide portion that is integrally formed on the outer peripheral surface of the fitting portion and whose axial length is longer than that of the fitting portion, and between the wide portion and the shaft member. A gap is formed in the wide portion, and a plurality of internal and external communication slits that extend in the axial direction and communicate with the outer peripheral side of the wide portion and the gap are formed, and one of the resins constituting the gear portion is formed. The resin gear is characterized in that the portion is filled in the inner and outer communication slits and the gap, and irregularities are formed on the outer peripheral surface of the shaft member where the gap portion of the gear portion contacts .
JP2004105949A 2004-03-31 2004-03-31 Resin gear Expired - Lifetime JP4442868B2 (en)

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