JPH0272259A - Gear made of synthetic resin - Google Patents
Gear made of synthetic resinInfo
- Publication number
- JPH0272259A JPH0272259A JP22408088A JP22408088A JPH0272259A JP H0272259 A JPH0272259 A JP H0272259A JP 22408088 A JP22408088 A JP 22408088A JP 22408088 A JP22408088 A JP 22408088A JP H0272259 A JPH0272259 A JP H0272259A
- Authority
- JP
- Japan
- Prior art keywords
- molded part
- shaped article
- resin
- shaped
- rim
- 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.)
- Granted
Links
- 229920003002 synthetic resin Polymers 0.000 title claims description 8
- 239000000057 synthetic resin Substances 0.000 title claims description 8
- 229920005989 resin Polymers 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 34
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 15
- 238000001746 injection moulding Methods 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract 3
- 239000002184 metal Substances 0.000 abstract 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000004299 exfoliation Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 13
- 239000004677 Nylon Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 229920006324 polyoxymethylene Polymers 0.000 description 3
- 229930182556 Polyacetal Natural products 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 241000282376 Panthera tigris Species 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Gears, Cams (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は合成樹脂を材料として射出成形される歯車に関
し、特に各々異なる特長を有する２種類の樹脂により形
成した歯車に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gear injection molded using synthetic resin, and particularly to a gear formed from two types of resin each having different features.
（従来の技術）
従来、樹脂成形歯車は一般にポリアセタール、ナイロン
などの合成樹脂材料を射出成形することにより製造され
ているが、成形収縮が太き（寸法精度が悪い欠点があっ
た。(Prior Art) Conventionally, resin molded gears have generally been manufactured by injection molding synthetic resin materials such as polyacetal and nylon, but this has had the disadvantage of large mold shrinkage (poor dimensional accuracy).
そこで、歯車を一次成形品部と二次成形品部とから構成
し、一次成形品部をポリカーボネイトなどの収縮率の小
さい樹脂で形成し、二次成形品部をポリアセタール、ナ
イロンなどの強度が高く油滑性に優れた樹脂で形成する
ことが提案されている（特公昭５４−２１９０３号公報
）。Therefore, the gear is made up of a primary molded part and a secondary molded part, with the primary molded part made of a resin with a low shrinkage rate such as polycarbonate, and the secondary molded part made of a high strength material such as polyacetal or nylon. It has been proposed to use a resin with excellent oil lubricity (Japanese Patent Publication No. 54-21903).
（発明が解決しようとする課題）
しかしながら、上記のような歯車にあっては、一次成形
品部と二次成形品部を形成する樹脂材料に相溶性がなく
融着しないため、回転トルクにより異材質境界面で剥離
してしまう問題点があった。(Problem to be Solved by the Invention) However, in the above-mentioned gear, the resin materials forming the primary molded part and the secondary molded part are not compatible and do not fuse together, so differences occur due to rotational torque. There was a problem of peeling at the material interface.
本発明はこのような事情に鑑みてなされたものであり、
一次成形品部と二次成形品部とが強固に結合して大きな
回転トルクが作用しても剥離することがなく、また射出
成形によりボス部と歯形部とを同一材料で形成できる利
点も有し、しかも成形収縮による悪影響を排除して精度
の良い合成樹脂歯車を提供することを目的とする。The present invention was made in view of these circumstances, and
The primary molded part and the secondary molded part are firmly connected and will not peel off even when a large rotational torque is applied, and injection molding also has the advantage that the boss part and tooth profile part can be formed from the same material. However, it is an object of the present invention to provide a synthetic resin gear with good precision by eliminating the adverse effects caused by molding shrinkage.
（課題を解決するための手段）
本発明は、樹脂成形歯車を少なくとも板状アーム部を形
成する一次成形品部と二次成形品部とから構成し、一次
成形品部には板状アーム部の側面から少なくともその外
周面に至る貫通孔をその肉厚内に穿設し、この貫通孔を
樹脂通路として一次成形品部の少なくとも外周に二次成
形品部を射出成形して形成することを特徴とするほか、
歯形部を歯形本体部を形成する一次成形品部と歯面部を
形成する二次成形品部とで構成し、歯面部は歯形本体部
の外周に射出成形した均一な薄肉の樹脂層により形成し
た合成樹脂製歯車を特徴とするものである。(Means for Solving the Problems) The present invention comprises a resin molded gear including at least a primary molded part forming a plate-shaped arm part and a secondary molded part, and the primary molded part has a plate-shaped arm part. A through hole extending from the side surface to at least the outer circumferential surface of the primary molded part is formed by injection molding a through hole in its wall thickness and using this through hole as a resin passage on at least the outer periphery of the primary molded part. In addition to the characteristics,
The tooth profile part is composed of a primary molded part that forms the tooth profile body part and a secondary molded part part that forms the tooth flank part, and the tooth flank part is formed by a uniform thin resin layer that is injection molded around the outer periphery of the tooth profile body part. It features synthetic resin gears.
（作用）
本発明にあっては、二次成形品部が一次成形品部内部の
板状アーム部側面から少なくともその外周面に至る貫通
孔を充填するとともに一次成形品部の少なくとも外周側
に射出成形により設けられており、二次成形品部の一部
として上記貫通孔に充填される樹脂は、一次成形品部の
内部においてその軸方向およびこれと直交する方向に連
続して設けられているので、二次成形品部は一次成形品
部に係止されることになり、両者の結合は非常に強固で
その一体化が高められる。(Function) In the present invention, the secondary molded part fills the through hole extending from the side surface of the plate-shaped arm inside the primary molded part to at least its outer peripheral surface, and is injected into at least the outer peripheral side of the primary molded part. The resin that is provided by molding and filled into the through hole as part of the secondary molded part is provided continuously in the axial direction and in the direction perpendicular to this inside the primary molded part. Therefore, the secondary molded part is locked to the primary molded part, and the connection between the two is very strong and their integration is enhanced.
また、上記二次成形品部の成形収縮により、両者の結合
はより強固な状態に至る。Further, due to molding shrinkage of the secondary molded part, the bond between the two becomes even stronger.
さらに、歯形本体部（一次成形品部）の外周面に均一な
薄肉の歯面部（二次成形品部）を被覆した場合は、一次
成形品部と二次成形品部の嵌合状態がより強固になるほ
か、歯面部が均一な肉厚のため成形収縮において異方性
がなく、成形収縮の予想が容易であり、精度の極めて高
い歯車を得られる。Furthermore, if the outer peripheral surface of the tooth profile body (primary molded part) is coated with a uniformly thin tooth surface (secondary molded part), the fit between the primary molded part and the secondary molded part will be improved. In addition to being strong, the tooth surface has a uniform wall thickness, so there is no anisotropy in molding shrinkage, making it easy to predict molding shrinkage, making it possible to obtain gears with extremely high precision.
（実施例）
本発明の一実施例を第１図乃至第６図に基づき説明する
。(Example) An example of the present invention will be described based on FIGS. 1 to 6.
第１図は本発明に係る歯車の正面図、第２図はそのＸ−
Ｘ線断面図である。Fig. 1 is a front view of the gear according to the present invention, and Fig. 2 is its X-
It is an X-ray cross-sectional view.
この歯車は、一次成形品部Ａと二次成形品部Ｂとが嵌合
一体化して構成されたもので、一次成形品部Ａとしてボ
ス部ｌ、板状アーム部２およびリムの一部３が形成され
、二次成形品部Ｂとしてリムの残部６および歯形部７が
形成されている。This gear is constructed by fitting and integrating a primary molded part A and a secondary molded part B. is formed, and the remaining part 6 of the rim and the toothed part 7 are formed as the secondary molded part B.
一次成形品部Ａの肉厚内には板状アーム部２の一側面２
ａからリムの一部３の外周面にまで至る貫通孔４が周方
向に沿って適宜の間隔で適当数（本実施例では８ケ）穿
設されており、この貫通孔４には二次成形品部形成の樹
脂通路として樹脂が充填８されている。One side 2 of the plate-like arm portion 2 is located within the wall thickness of the primary molded part A.
A suitable number of through holes 4 (eight holes in this embodiment) are bored at appropriate intervals along the circumferential direction from a to the outer circumferential surface of the part 3 of the rim. A resin is filled 8 as a resin passage for forming the molded part.
この一次成形品部Ａの成形にあたっては、射出成形によ
り得られた成形品に切削加工により貫通孔４を穿設して
も良いほか、中抜きピンを利用して成形時に既に貫通孔
４が設けられた射出成形品を得るようにしても良く、ま
た一次成形品部は必ずしも射出成形品である必要はなく
、他の成形方法で得られたものでも良い。When molding this primary molded part A, the through-holes 4 may be formed by cutting in the molded product obtained by injection molding, or the through-holes 4 may be formed already at the time of molding using hollow pins. Alternatively, the primary molded part does not necessarily have to be an injection molded part, and may be obtained by other molding methods.
二次成形品部Ｂの成形にあたっては、上記の一次成形品
部Ａを冷却し充分に成形収縮させてから射出成形用金型
にセットし、この金型内のキャビティに樹脂材料を充填
することにより行われるが、通常一次成形品部Ａの一側
面側において円周方向に配置された複数のビンポイント
ゲートを通して射出され、この射出された樹脂材料がま
ず一次成形品部内部の貫通孔４を樹脂通路として順次充
填した後、一次成形品部Ａのリムの一部３の外周にリム
の残部６および歯形部７を形成する。When molding the secondary molded part B, the above-mentioned primary molded part A is cooled and sufficiently molded to shrink, then set in an injection mold, and the cavity in this mold is filled with resin material. Usually, the injected resin material is injected through a plurality of bottle point gates arranged circumferentially on one side of the primary molded part A, and the injected resin material first passes through the through hole 4 inside the primary molded part. After sequentially filling the resin passages, a remaining rim portion 6 and a toothed portion 7 are formed on the outer periphery of the rim portion 3 of the primary molded part A.
この射出成形された二次成形品部Ｂは時間経過とともに
冷却硬化されることにより、歯形部７およびリムの残部
６は内周方向へ向かって成形収縮し、一次成形品部Ａと
二次成形品部Ｂとの嵌合状態は強化される。As this injection-molded secondary molded part B is cooled and hardened over time, the toothed part 7 and the remaining part 6 of the rim shrink toward the inner circumference, and the primary molded part A and the secondary molded part The fitted state with component B is strengthened.
なお、一次成形品部Ａおよび二次成形品部Ｂを形成する
樹脂材料としては、任意のものを組合せることができる
が、一次成形品部Ａには熱硬化性樹脂、ＡＢＳ樹脂、ポ
リカーボネイトなどのような収縮率が小さく歪の少ない
樹脂、二次成形品部Ｂにはナイロン３ポリアセタールな
どのように強度が高く潤滑性に優れた樹脂を用いるのが
好ましい。Note that any resin material can be used to form the primary molded part A and the secondary molded part B, but the primary molded part A may be made of thermosetting resin, ABS resin, polycarbonate, etc. For the secondary molded part B, it is preferable to use a resin with high strength and excellent lubricity such as nylon 3-polyacetal.
尚、板状アーム部２の一側面２ａから穿設する貫通孔４
は他側面２ｂまで貫通させても良い。Incidentally, a through hole 4 bored from one side 2a of the plate-like arm portion 2
may be made to penetrate to the other side surface 2b.
第３図および第４図は本発明の他の実施例を示す正面図
およびＹ−Ｙ′４１Ａ断面図である。3 and 4 are a front view and a sectional view taken along YY'41A, respectively, showing another embodiment of the present invention.
本実施例は、前記実施例と同様に一次成形品部Ｃと二次
成形品部りとが嵌合一体化されたものであるが、一次成
形品部Ｃとしてボス部１）．板状アーム部１２．リム部
１３および歯形本体部１４が形成され、二次成形品部り
として歯面部１７が形成されている点、ならびに一次成
形品部Ｃの肉厚内に板状アーム部１２の一側面１２ａか
ら歯形本体部Ｉ４の外周面に至る貫通孔１５が複数（本
実施例では８ケ）穿設されている点において前記実施例
と異なっている。In this embodiment, a primary molded part C and a secondary molded part are fitted and integrated as in the previous embodiment, but the primary molded part C includes a boss part 1). Plate arm portion 12. The rim portion 13 and the tooth-shaped main body portion 14 are formed, and the tooth surface portion 17 is formed as a secondary molded part, and within the thickness of the primary molded part C from one side 12a of the plate-like arm part 12. This embodiment differs from the previous embodiment in that a plurality of through holes 15 (eight in this embodiment) are provided to reach the outer circumferential surface of the toothed main body portion I4.
この一次成形品部Ｃと二次成形品部りとは、前記実施例
と同様の方法および樹脂材料で成形され、上記貫通孔Ｉ
５には二次成形品部形成用の樹脂通路として樹脂が充填
１８される。二次成形品部りの歯面部１７は肉厚が０，
５〜１．Ｏｍｍ程度の薄い均一な樹脂層で、歯形本体部
１４の外周にいわばコーティングする状態に被覆されて
いる。The primary molded part C and the secondary molded part are molded using the same method and resin material as in the above embodiment, and the through hole I
5 is filled with resin 18 as a resin passage for forming the secondary molded part. The tooth surface part 17 of the secondary molded part has a wall thickness of 0,
5-1. The outer periphery of the tooth-shaped main body 14 is coated with a thin and uniform resin layer of approximately 0 mm in thickness.
そして、前記実施例と同様、一次成形品部Ｃは二次成形
品部りの成形収縮により強固に嵌合一体化されている。As in the embodiment described above, the primary molded part C is firmly fitted and integrated by the molding shrinkage of the secondary molded part.
第５図および第６図は本発明のさらに他の実施例を示す
正面図および２−２線断面図である。5 and 6 are a front view and a sectional view taken along the line 2-2, respectively, showing still another embodiment of the present invention.
本実施例も、前記実施例と同様に一次成形品部Ｅと二次
成形品部Ｆとが嵌合一体化されたものであるが、一次成
形品部Ｅとしてボスの一部２１゜板状アーム部２２およ
びリム部の一部２３が形成され、二次成形品部Ｆとして
ボス残部２５．リムの残部２Ｇおよび歯形部２７が形成
されている。In this example as well, the primary molded part E and the secondary molded part F are fitted and integrated as in the previous example, but as the primary molded part E, a part of the boss is shaped like a 21° plate. An arm part 22 and a part 23 of the rim part are formed, and a boss remaining part 25. is formed as a secondary molded part F. A remaining portion 2G of the rim and toothed portions 27 are formed.
また、一次成形品部Ｅの肉厚内に板状アーム部２２の一
側面２２ａからリムの一部２３の外周面およびボスの一
部２１の内周面に至る貫通孔２４が周方向に沿って複数
（本実施例では８ケ）穿設されており、上記実施例と同
様にこの貫通孔２４には二次成形品部形成の樹脂通路と
して樹脂が充填２８されている。In addition, a through hole 24 extending from one side 22a of the plate-shaped arm portion 22 to the outer circumferential surface of the rim portion 23 and the inner circumferential surface of the boss portion 21 is provided within the wall thickness of the primary molded part E along the circumferential direction. A plurality of through holes (eight in this embodiment) are bored, and similarly to the above embodiment, the through holes 24 are filled with resin 28 as resin passages for forming the secondary molded part.
この実施例においては、一次成形品部内部の貫通孔を介
して一次成形品部の内周および外周の両側に一体化した
二次成形品部を設けるようにしであるので、二次成形品
部の成形収縮により、一次成形品部をその内外両周面か
ら挟持固定することが可能になり、このため両者の結合
は強固な状態に至る。In this embodiment, the secondary molded part is provided integrally on both sides of the inner and outer peripheries of the primary molded part through the through holes inside the primary molded part. Due to the molding shrinkage, it becomes possible to clamp and fix the primary molded part from both its inner and outer circumferential surfaces, thereby achieving a strong bond between the two.
また、歯車の歯形部とボス部とを同一の樹脂にて形成で
きるので、二次成形品部を潤滑性に富んだ樹脂で形成し
て上記画部分共に油滑性を確保することができる。Further, since the tooth profile portion and the boss portion of the gear can be formed from the same resin, the secondary molded product portion can be formed from a resin rich in lubricity to ensure oil lubricity for both the above-mentioned image portions.
（発明の効果）
以上のとおり、前記特許請求の範囲の請求項１に係る発
明にあっては、相溶性がなく融着不可能な異材質樹脂材
料から成形される歯車において、一次成形品部と二次成
形品部とは、後者が前者の内部を部分的に貫通して係止
状態に一体形成されているうえに、後者が前者の少なく
とも外側から成形収縮するので、両者の結合は緊密一体
化し非常に強固なものにすることができ、大きな回転ト
ルクを作用させても異材質境界面で剥離することなく耐
久性を向上できる。(Effect of the invention) As described above, in the invention according to claim 1 of the above claims, in a gear molded from dissimilar resin materials that are incompatible and cannot be fused, the primary molded part and the secondary molded part, the latter partially penetrates the inside of the former and is integrally formed in a locked state, and the latter undergoes molding shrinkage from at least the outside of the former, so the connection between the two is tight. It can be integrated into a very strong structure, and its durability can be improved without peeling at the interface between different materials even when a large rotational torque is applied.
また、前記請求項２に係る発明にあっては、前記の効果
に加えて、歯形部の歯形本体部と歯面部が凹凸状に嵌合
密着しており、一次成形品部と二次成形品部との結合が
一層強固になるほか、歯面部が均一な薄肉層なので、成
形収縮を適確に把握して歯車の設計や金型の製作を行う
ことができ、寸法・形状精度を大幅に向上させることが
できる。Moreover, in the invention according to claim 2, in addition to the above-mentioned effects, the tooth profile body part and the tooth surface part of the tooth profile part are fitted tightly in an uneven shape, and the primary molded part part and the secondary molded part In addition to making the bond even stronger, the tooth surface is a uniform thin layer, so it is possible to accurately understand molding shrinkage when designing gears and manufacturing molds, greatly improving dimensional and shape accuracy. can be improved.
第１図は本発明の一実施例を示す正面図、第２図はその
Ｘ−Ｘ線断面図、第３図は他の実施例を示す正面図、第
４図はそのＹ−Ｙ線断面図、第５図はさらに他の実施例
を示す正面図、第６図はその２−２線断面図である。
Ａ、Ｃ，Ｅ・・・一次成形品部、
Ｂ、Ｄ、Ｆ・・・二次成形品部、
ｌｌ・・・ボス部、
１２．２２・・・板状アーム部、
２３・・・リムの一部、４，１５．２４・・・貫通孔、
２６・・・リムの残部、７，２７・・・歯形部、・・・
リム部、 １４・・・歯形本体部、・・・歯面
部、 ２１・・・ボスの一部、・・・ボスの残部
。
出願人 タイガースポリマー株式会社代表者 澤田博
行
第
図
第 １ 図
）−Ｘ
第５図Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line X-X, Fig. 3 is a front view showing another embodiment, and Fig. 4 is a sectional view taken along the line Y-Y. FIG. 5 is a front view showing still another embodiment, and FIG. 6 is a sectional view taken along the line 2--2. A, C, E...Primary molded part, B, D, F...Secondary molded part, ll...Boss part, 12.22...Plate arm part, 23...Rim Part of 4, 15.24... through hole,
26...Remaining part of rim, 7, 27...Tooth profile part,...
Rim part, 14... Tooth profile main body part,... Tooth surface part, 21... Part of boss,... Remaining part of boss. Applicant Tigers Polymer Co., Ltd. Representative Hiroyuki Sawada Figure 1)-X Figure 5
Claims (2)
と二次成形品部とからなる歯車において、該一次成形品
部は板状アーム部の側面から少なくともその外周面に至
る貫通孔がその肉厚内に穿設され、該二次成形品部が該
貫通孔を樹脂通路として該一次成形品部の少なくとも外
周に射出成形されている合成樹脂製歯車。(1) In a gear consisting of a primary molded part and a secondary molded part forming at least a plate-shaped arm part, the primary molded part has a through hole extending from the side surface of the plate-shaped arm part to at least its outer peripheral surface. A gear made of synthetic resin, which is bored in the wall thickness, and the secondary molded part is injection molded on at least the outer periphery of the primary molded part, using the through hole as a resin passage.
面部を形成する二次成形品部とで構成され、該歯面部は
該歯形本体部の外周に射出成形された均一な薄肉の樹脂
層により形成されている請求項（１）記載の合成樹脂製
歯車。(2) The tooth profile is composed of a primary molded part that forms the tooth profile main body and a secondary molded part that forms the tooth flank, and the tooth flank is a uniform thin wall that is injection molded on the outer periphery of the tooth profile main body. The synthetic resin gear according to claim 1, wherein the synthetic resin gear is formed of a resin layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63224080A JP2516056B2 (en) | 1988-09-07 | 1988-09-07 | Synthetic resin gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63224080A JP2516056B2 (en) | 1988-09-07 | 1988-09-07 | Synthetic resin gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0272259A true JPH0272259A (en) | 1990-03-12 |
| JP2516056B2 JP2516056B2 (en) | 1996-07-10 |
Family
ID=16808246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63224080A Expired - Fee Related JP2516056B2 (en) | 1988-09-07 | 1988-09-07 | Synthetic resin gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2516056B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6941832B2 (en) * | 2002-01-15 | 2005-09-13 | Enplas Corporation | Injection molded resin gear, injection molded resin rotating body, and injection molded article |
| CN103470727A (en) * | 2013-08-15 | 2013-12-25 | 宁波市鄞州恒泰机电有限公司 | Transmission gear for electric motor bicycle |
| CN103470724A (en) * | 2013-08-15 | 2013-12-25 | 宁波市鄞州恒泰机电有限公司 | Gear |
| CN103671828A (en) * | 2013-12-26 | 2014-03-26 | 深圳市海翔铭实业有限公司 | Double-material plastic gear |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102670455B1 (en) * | 2019-09-03 | 2024-05-29 | 에이치엘만도 주식회사 | Worm Wheel of Reducer for Steering Apparatus and Manufacturing Method of The Same |
-
1988
- 1988-09-07 JP JP63224080A patent/JP2516056B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6941832B2 (en) * | 2002-01-15 | 2005-09-13 | Enplas Corporation | Injection molded resin gear, injection molded resin rotating body, and injection molded article |
| CN1298524C (en) * | 2002-01-15 | 2007-02-07 | 株式会社恩普乐 | Molded resin gear, moded resin rotaor and molded article |
| CN103470727A (en) * | 2013-08-15 | 2013-12-25 | 宁波市鄞州恒泰机电有限公司 | Transmission gear for electric motor bicycle |
| CN103470724A (en) * | 2013-08-15 | 2013-12-25 | 宁波市鄞州恒泰机电有限公司 | Gear |
| CN103671828A (en) * | 2013-12-26 | 2014-03-26 | 深圳市海翔铭实业有限公司 | Double-material plastic gear |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2516056B2 (en) | 1996-07-10 |
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