JP2590225B2 - Plastic mold gear - Google Patents
Plastic mold gearInfo
- Publication number
- JP2590225B2 JP2590225B2 JP21498288A JP21498288A JP2590225B2 JP 2590225 B2 JP2590225 B2 JP 2590225B2 JP 21498288 A JP21498288 A JP 21498288A JP 21498288 A JP21498288 A JP 21498288A JP 2590225 B2 JP2590225 B2 JP 2590225B2
- Authority
- JP
- Japan
- Prior art keywords
- rim
- boss
- rib
- gear
- plastic molded
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、プラスチツクモールドギヤに係り、特に、
ギヤ精度が高く、かつ伝達力の大きなプラスチツクモー
ルドギヤに関する。The present invention relates to a plastic molded gear, and more particularly, to a plastic molded gear.
The present invention relates to a plastic molded gear having high gear accuracy and large transmission force.
プラスチツクモールドギヤは、騒音が小さく、安価で
ある等の利点を有し、広く使用されている。Plastic molded gears have advantages such as low noise and low cost, and are widely used.
しかしながら、従来形プラスチツクモールドギヤの最
大の欠点は、負荷能力が小さく、かつ高精度が得られな
いことであり、このため、従来、その用途は、例えば実
公昭57−31651号公報に示されるように、非常に小さな
伝達力でよい用途や回転精度を必要としない用途に限ら
れていた。However, the biggest disadvantages of the conventional plastic molded gear are that the load capacity is small and high accuracy cannot be obtained. Therefore, the conventional use thereof is as shown in, for example, Japanese Utility Model Publication No. 57-31651. In addition, it has been limited to applications that require a very small transmission force and applications that do not require rotational accuracy.
これをさらに詳述すると、プラスチツクギヤは、疲労
強度，耐摩耗性等の性能面から、ポリアセタール樹脂を
使用することが多い。一般に、エンジニアリングプラス
チツクは、比較的大きな成形収縮率を有するが、ポリア
セタールの場合、1.6〜2.2％程度の成形収縮率を有し、
また冷却速度によつて成形収縮率が変化する性質を有し
ている。このため、前記したプラスチツクモールドギヤ
の伝達力を増すために肉厚を厚くしようとすると、ヒケ
が生じて精度が低下するばかりでなく、芯部にボイドが
発生し、強度が逆に低下する問題があり、このようなこ
とから、従来形プラスチツクモールドギヤは、精度が低
く、また伝達能力を増すことが困難で、その使用範囲が
限定されていた。More specifically, a plastic gear is often made of a polyacetal resin in terms of performance such as fatigue strength and wear resistance. In general, engineering plastics have a relatively large molding shrinkage, while polyacetal has a molding shrinkage of about 1.6 to 2.2%,
Further, it has the property that the molding shrinkage changes depending on the cooling rate. For this reason, when the thickness is increased to increase the transmission force of the plastic mold gear, not only the sink is generated and the accuracy is reduced, but also a void is generated in the core and the strength is reduced conversely. For this reason, conventional plastic molded gears have low accuracy and it is difficult to increase the transmission capacity, and the range of use is limited.
本発明の目的は、前記した従来技術の問題点を解決
し、高精度で伝達能力の大きさプラスチツクモールドギ
ヤを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a plastic molded gear having high transmission capability and high precision.
前記目的は、筒形状のボスと、このボスの外周から外
周方向に延在するように一体に形成されている円盤状の
ディスク部と、このディスク部と、このディスク部の外
周に一体に形成されている筒形状のリム部と、このリム
部の外周に形成されるギヤ用の歯とを有するプラスチツ
クで一体にモールド形成されているプラスチツクモール
ドギヤにおいて、 前記ディスク部の側面に長さの長い大リブと長さの短
い小リブをそれぞれ放射状に多数形成し、前記大リブの
内周端は前記ボスの外周に、前記小リブの外周端は前記
リム部の内周にそれぞれ連接して一体になるように形成
し、前記大リブの外周端は前記リム部の内周より、前記
小リブの内周端は前記ボスの外周よりそれぞれ離間する
ように形成することにより達成される。The object is to form a cylindrical boss, a disk-shaped disk portion integrally formed so as to extend from the outer periphery of the boss in the outer peripheral direction, and to integrally form the disk portion and the outer periphery of the disk portion. A plastic molded gear integrally formed of a plastic having a cylindrical rim portion and gear teeth formed on the outer periphery of the rim portion, wherein a long side is provided on the side surface of the disk portion. A large number of large ribs and a plurality of small ribs having a short length are formed radially, and the inner peripheral end of the large rib is connected to the outer periphery of the boss, and the outer peripheral end of the small rib is connected to the inner periphery of the rim portion. This is achieved by forming such that the outer peripheral end of the large rib is spaced apart from the inner periphery of the rim portion, and the inner peripheral end of the small rib is spaced apart from the outer periphery of the boss.
また、前記目的は、プラスチツクモールドギヤのデイ
スク部とリムのみを連結しボスに至らないリブを設ける
ことによつても達成される。Further, the above object is also achieved by providing a rib which connects only the disk portion and the rim of the plastic molded gear and does not reach the boss.
さらに、前記目的は、プラスチツクモールドギヤのリ
ムからボスに至る間にリブを設け、その間に切欠部を設
けて、それぞれのリブを独立させることによつても達成
される。Further, the above object is also achieved by providing a rib between the rim of the plastic molded gear and the boss and providing a notch therebetween to make each rib independent.
プラスチツクモールドギヤの精度および伝達能力を向
上させる方策を見出すため、第４図に示す形状の実験用
プラスチツクモールドギヤを製作し、リム厚さｔを変化
させた時の伝達力ＴおよびJISによる精度等級を第５図
に示す。伝達力Ｔは、減速装置（図示せず）に本モール
ドギヤを組込んで測定したトルクと破損までの運転回数
との関係から、104回で破損したトルク値を相対値で示
す。In order to find a way to improve the accuracy and transmission capacity of plastic molded gears, an experimental plastic molded gear with the shape shown in Fig. 4 was manufactured, and the transmission force T when the rim thickness t was changed and the accuracy grade according to JIS Is shown in FIG. Transmission force T from the relationship between the operating frequency to failure torque was measured incorporating the present Morudogiya the reduction gear (not shown), indicating the torque values were destroyed 10 4 times as a relative value.
次に、前記実験に使用した試験品の破損形態を調べて
みると、第６図および第７図に示す２つの形態があるこ
とが判明した。このうち、第６図のものは、リム厚さｔ
＝3mm以下のものにみられ、第７図のものは、これより
厚い場合にみられた。また、第７図の破断面を観察する
と、ボイドが発生していることが認められ測定値のバラ
ツキが大きくなつているのは、このためである。一方、
リム厚さｔ＝3mm以下のものでは、運転時間の経過に伴
い、リム部の直径が小さくなる現象が認められた。な
お、これは、第８図に示すように、運転時の伝達力Ftに
対し噛合い圧力角αにより Fr＝Ftsinα で表わされるラジアル荷重Frがリム部を内側に縮める方
向に働くが、リムの厚さが小さい領域においては、この
力により両端付近が内側に変形し、伝達トルクを主に中
央部のみで負担する形となつており、伝達トクルが小さ
くなつているためであることが判明した。一方、精度等
級について調べてみると、リム厚さが大きくなるにつれ
てヒケが大きくなるため悪化するが、特に2mmを超えて
から大きく悪化することが分つた。Next, when examining the broken form of the test article used in the above experiment, it was found that there were two forms shown in FIG. 6 and FIG. Among them, FIG. 6 shows the rim thickness t.
= 3 mm or less, and that of FIG. 7 was observed when the thickness was larger than this. Observation of the fractured surface in FIG. 7 shows that voids were generated, and the dispersion of the measured values was large. on the other hand,
With the rim thickness t = 3 mm or less, a phenomenon was observed in which the diameter of the rim portion became smaller as the operation time elapsed. Note that this is, as shown in FIG. 8, in a direction radial load F r represented by F r = F t sin .alpha by meshing pressure angle α with respect to the transmission force F t during operation reduce the rim portion inwardly Although it works, in the area where the rim thickness is small, the vicinity of both ends is deformed inward due to this force, and the transmission torque is mainly borne only at the central part, and the transmission torque is small. It turned out to be. On the other hand, when examining the accuracy class, it was found that as the rim thickness increased, sink marks became larger and thus worsened.
このような実験結果にもとづき、本発明においては、
プラスチツクモールドギヤの形状を、前記〔課題を解決
するための手段〕の項に示した形状とすることにより、
リム厚さを精度が悪化しない厚さに押えると共に、リム
の精度に影響を与えない長さのリブを設けて、リムの内
側方向への補強をおこなうようにしたものである。Based on such experimental results, in the present invention,
By making the shape of the plastic mold gear the shape shown in the section of the above-mentioned [Means for Solving the Problems],
The rim thickness is suppressed to a thickness that does not deteriorate the accuracy, and a rib having a length that does not affect the accuracy of the rim is provided to reinforce the rim inward.
以下、本発明を、第１図および第２図の一実施例にも
とづいて説明すると、本発明に係るプラスチツクモール
ドギヤの縦断正面図である第１図、および同側面図であ
る第２図においては、１はプラスチツクモールドギヤの
ボス、２はデイスク部、３はリム、４は歯、６は大リブ
で、大リブ６は、デイスク部２とボス１に連結し、リム
３付近まで伸び、リム３には連結されることなく、均等
に設けられている。７は小リブで、小リブ７は、デイス
ク部２とリム３にのみ連結して、これまた前記大リブ６
と同様、均等に設けられている。Hereinafter, the present invention will be described with reference to one embodiment of FIGS. 1 and 2. FIG. 1 is a longitudinal sectional front view of a plastic molded gear according to the present invention, and FIG. 2 is a side view of the same. 1 is a plastic molded gear boss, 2 is a disk portion, 3 is a rim, 4 is a tooth, 6 is a large rib, and the large rib 6 is connected to the disk portion 2 and the boss 1 and extends to the vicinity of the rim 3, The rim 3 is provided evenly without being connected. 7 is a small rib, and the small rib 7 is connected only to the disk portion 2 and the rim 3 and is also connected to the large rib 6.
Like the above, they are provided evenly.
本発明は以上のごときであり、前記実施例において
は、プラスチツクモールドギヤのリム精度に影響を与え
ない長さの大小２種類のリブ6,7を設けたことにより、
リム厚さを精度が悪化しない厚さに押えることができ、
試作実験によれば、第５図に示すように、その精度等級
が６級から４級に２クラス向上すると同時に、ギヤ伝達
トルクを約25％向上させることができた。The present invention is as described above, and in the above embodiment, by providing two types of large and small ribs 6, 7 having a length that does not affect the rim accuracy of the plastic molded gear,
The rim thickness can be reduced to a thickness that does not degrade accuracy,
According to the prototype experiment, as shown in FIG. 5, the accuracy class was improved from class 6 to class 4 by two classes, and at the same time, the gear transmission torque was able to be improved by about 25%.
また、前記実施例に示すプラスチツクモールドギヤの
精度と、第３図に符号５で示すリブ構造を採用した従来
形プラスチツムモールドギヤの精度とを、両歯面噛合い
試験によつて比較すると、第９図に示す従来形ギヤの精
度に比べて、第10図に示す本実施例ギヤの精度の方が、
著しく良好な結果が出ていることが分かる。In addition, comparing the precision of the plastic molded gear shown in the above embodiment with the precision of the conventional plastic molded gear employing the rib structure indicated by reference numeral 5 in FIG. Compared to the precision of the conventional gear shown in FIG. 9, the precision of the gear of the present embodiment shown in FIG.
It can be seen that remarkably good results are obtained.
第11図は本発明の他の実施例を示し、第11図の実施例
においては、プラスチツクモールドギヤのデイスク部２
とリム３のみを連結しボス１に至らないリブ８を設けた
ものであつて、この構成によつても、前記第１の実施例
と同様の効果を奏することができる。FIG. 11 shows another embodiment of the present invention. In the embodiment of FIG. 11, the disk portion 2 of the plastic mold gear is provided.
The rim 3 is connected to the rim 3 only, and the rib 8 that does not reach the boss 1 is provided. With this configuration, the same effect as in the first embodiment can be obtained.
第12図は本発明のさらに他の実施例を示し、第12図の
実施例においては、プラスチツクモールドギヤのリム３
からボス１に至る間にリブ9,10を設け、その間に切欠部
11を設けて、それぞれのリブ9,10を独立させたものであ
つて、この実施例によつても、前記第１および第２の実
施例と同様の効果を奏することができる。FIG. 12 shows still another embodiment of the present invention. In the embodiment of FIG. 12, the rim 3 of the plastic mold gear is provided.
Ribs 9 and 10 are provided between
Since the ribs 11 and 11 are provided to make the ribs 9 and 10 independent of each other, this embodiment can also provide the same effects as those of the first and second embodiments.
〔発明の効果〕 以上、本発明によれば、プラスチツクモールドギヤの
伝達力を大幅に向上させることができるだけでなく、そ
の精度をも大巾に向上させることができ、従来形プラス
チツクモールドギヤの欠点、すなわち負荷能力が小さ
く、精度が悪い欠点を解決することができ、その使用範
囲を大いに拡大することができる。[Effects of the Invention] As described above, according to the present invention, not only can the transmission force of the plastic molded gear be significantly improved, but also its precision can be greatly improved, and the disadvantages of the conventional plastic molded gear In other words, it is possible to solve the disadvantage that the load capacity is small and the accuracy is low, and the range of use can be greatly expanded.
第１図は本発明に係るプラスチツクモールドギヤの一実
施例を示す縦断正面図、第２図は同側面図、第３図は従
来形プラスチツクモールドギヤの側面図、第４図は本発
明者が先に製作した実験用プラスチツクモールドギヤの
縦断面正面図、第５図はプラスチツクモールドギヤのリ
ム厚と伝達トルクおよび精度等級を示す性能図、第６図
および第７図はプラスチツクモールドギヤの歯の破損形
態を示す斜視図、第８図はギヤ伝達力の分力を示す説明
図、第９図および第10図はそれぞれ従来形プラスチツク
モールドギヤおよび前記実施例に示す本発明プラスチツ
クモールドギヤの両歯面噛合い試験データを示す図、第
11図および第12図はそれぞれ本発明の異なつた実施例を
示すプラスチツクモールドギヤの側面図である。 １……ボス、２……デイスク部、３……リム、４……
歯、６……大リブ、７……小リブ。FIG. 1 is a longitudinal sectional front view showing an embodiment of a plastic molded gear according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a side view of a conventional plastic molded gear, and FIG. FIG. 5 is a vertical sectional front view of the experimentally produced plastic molded gear, FIG. 5 is a performance diagram showing the rim thickness, transmission torque and accuracy class of the plastic molded gear, and FIGS. 6 and 7 are the teeth of the plastic molded gear. FIG. 8 is a perspective view showing a broken form, FIG. 8 is an explanatory view showing a component force of a gear transmission force, and FIGS. 9 and 10 are both teeth of a conventional plastic mold gear and the plastic mold gear of the present invention shown in the above embodiment. FIG. 10 is a diagram showing surface meshing test data,
FIG. 11 and FIG. 12 are side views of a plastic molded gear showing different embodiments of the present invention. 1 ... boss, 2 ... disk part, 3 ... rim, 4 ...
Tooth, 6 ... large rib, 7 ... small rib.
Claims (3)
方向に延在するように一体に形成されている円盤状のデ
ィスク部と、このディスク部と、このディスク部の外周
に一体に形成されている筒形状のリム部と、このリム部
の外周に形成されるギヤ用の歯とを有するプラスチツク
で一体にモールド形成されているプラスチツクモールド
ギヤにおいて、 前記ディスク部の側面に長さの長い大リブと長さの短い
小リブをそれぞれ放射状に多数形成し、前記大リブの内
周端は前記ボスの外周に、前記小リブの外周端は前記リ
ム部の内周にそれぞれ連接して一体になるように形成
し、前記大リブの外周端は前記リム部の内周より、前記
小リブの内周端は前記ボスの外周よりそれぞれ離間する
ように形成したことを特徴とするプラスチックモールド
ギヤ。1. A cylindrical boss, a disk-shaped disk portion integrally formed so as to extend from the outer periphery of the boss in the outer peripheral direction, and an integral part of the disk portion and the outer periphery of the disk portion. In a plastic molded gear integrally molded with a plastic having a cylindrical rim portion formed and gear teeth formed on an outer periphery of the rim portion, a side of the disc portion has a length. A large number of long large ribs and a small number of short ribs each having a short length are radially formed, and the inner peripheral end of the large rib is connected to the outer periphery of the boss, and the outer peripheral end of the small rib is connected to the inner periphery of the rim portion. A plastic rib formed so that an outer peripheral end of the large rib is separated from an inner periphery of the rim portion and an inner peripheral end of the small rib is separated from an outer periphery of the boss. gear .
びディスク部を有するプラスチックモールドギヤにおい
て、ディスク部とリムのみを連結しボスに至らないリブ
を設けたことを特徴とするプラスチックモールドギヤ。2. A plastic molded gear having integrally molded teeth, a rim, a boss, and a disk portion, wherein a rib that connects only the disk portion and the rim and does not reach the boss is provided.
びディスク部を有するプラスチックモールドギヤにおい
て、リムから内側に向けて延びるリム側のリブとボスか
ら外側に向けて延びるボス側のリブをそれぞれ放射状に
多数形成し、リム側のリブの内端をボスの外周より離間
させ、ボス側のリブの外端をリムの内周より離間させ、
リム側のリブとボス側のリブは側面が近接して対向する
ように配置したことを特徴とするプラスチックモールド
ギヤ。3. A plastic molded gear having integrally molded teeth, a rim, a boss, and a disc portion, wherein a rim-side rib extending inward from the rim and a boss-side rib extending outward from the boss are respectively provided. Radially forming a large number, the inner end of the rim side rib is separated from the outer periphery of the boss, the outer end of the boss side rib is separated from the inner periphery of the rim,
A plastic molded gear, wherein the rib on the rim side and the rib on the boss side are arranged so that the side faces are closely opposed to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21498288A JP2590225B2 (en) | 1988-08-31 | 1988-08-31 | Plastic mold gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21498288A JP2590225B2 (en) | 1988-08-31 | 1988-08-31 | Plastic mold gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0266363A JPH0266363A (en) | 1990-03-06 |
| JP2590225B2 true JP2590225B2 (en) | 1997-03-12 |
Family
ID=16664754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21498288A Expired - Lifetime JP2590225B2 (en) | 1988-08-31 | 1988-08-31 | Plastic mold gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2590225B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2515602Y2 (en) * | 1991-04-15 | 1996-10-30 | 三菱電機株式会社 | Planetary gear reduction starter device |
| US5852951A (en) * | 1994-10-04 | 1998-12-29 | Briggs & Stratton Corporation | Composite gear and method of making same |
| DE102017201383A1 (en) | 2017-01-30 | 2018-08-02 | Robert Bosch Gmbh | Drive wheel for a transmission drive device |
-
1988
- 1988-08-31 JP JP21498288A patent/JP2590225B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0266363A (en) | 1990-03-06 |
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