JP2021092313A - gear - Google Patents

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Publication number
JP2021092313A
JP2021092313A JP2020189925A JP2020189925A JP2021092313A JP 2021092313 A JP2021092313 A JP 2021092313A JP 2020189925 A JP2020189925 A JP 2020189925A JP 2020189925 A JP2020189925 A JP 2020189925A JP 2021092313 A JP2021092313 A JP 2021092313A
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gear
strength
frp
plastic
gears
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清子 内田
Kiyoko Uchida
清子 内田
隆志 内田
Takashi Uchida
隆志 内田
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Abstract

To provide an FRP gear that is lightweight and has strength to solve such the problem that a metal gear has strength but heavy while a plastic gear is lightweight but poor in strength.SOLUTION: A gear includes a key groove in a boss part. The boss part is made of laminated FRP continuous fiber fabric sheets. The fiber continues from an inner periphery including a key groove periphery to an outer periphery in a boss part peripheral direction.SELECTED DRAWING: Figure 1

Description

本発明は、繊維強化プラスチック（FRP）製歯車に関する。 The present invention relates to fiber reinforced plastic (FRP) gears.

歯車の素材は金属あるいはプラスチックが用いられている。金属歯車は、強度はあるが重い、プラスチック歯車は金属歯車に比べ強度は落ちるが軽い。 The material of the gear is metal or plastic. Metal gears are strong but heavy, and plastic gears are less strong but lighter than metal gears.

金属歯車のように強度があり、プラスチック歯車のように軽い歯車が望まれる。 Gears that are as strong as metal gears and light as plastic gears are desired.

FRPは軽くて強度もあり、FRPで歯車を製作すれば強くて軽い歯車が得られる。 FRP is light and strong, and if you make gears with FRP, you can get strong and light gears.

下記先行技術文献に見られるようにFRP歯車が検討されている。 FRP gears are being studied as seen in the prior art literature below.

特開平５−２８０６１７Japanese Patent Application Laid-Open No. 5-280617 特許第５３９１９０１Patent No. 5391901 特開２０１６−８３８９２JP 2016-83892

金属歯車は、強度はあるが重い、プラスチック歯車は軽いが金属歯車程の強度はない。プラスチック歯車並みに軽く金属歯車並みあるいは以上に強度のある歯車を得ることが課題である。軽くて強度のある歯車を得るには使用素材の選択が必要である。その素材としてFRPが適している。FRPは金属並み、あるいは以上の強度を有し、かつ、プラスチック並みの質量である。歯車は、歯部、回転軸を取り付けるボス部、歯部とボス部とを結ぶハブ部からなる。歯車で強度要求の厳しい部分は歯部である。従い、プラスチック歯車の歯部を強度の高いFRPで製作することが考えられる。特許文献１、２はFRP製歯部の成形方法を記載している。また、ハブ部の強度は歯部程には必要ではないため、これら文献はハブ部素材として従来のプラスチックあるいはプラスチックに短繊維を混ぜたコンパウンドでの成形を記載している。歯部が高強度化すると、つぎに高強度化が必要な部分はボス部である。歯部に負荷が加わると、回転軸とボス部との間で、特に、回転軸と歯車との滑りを防ぐためのキー溝周りは歯部負荷以上の負荷が発生する。この故に、歯部の高強度化を活かすためにはボス部を高強度化しなければならない。 Metal gears are strong but heavy, and plastic gears are light but not as strong as metal gears. The challenge is to obtain gears that are as light as plastic gears or stronger than metal gears. In order to obtain light and strong gears, it is necessary to select the material to be used. FRP is suitable as the material. FRP has strength equal to or higher than that of metal, and has a mass equivalent to that of plastic. The gear consists of a tooth portion, a boss portion to which a rotating shaft is attached, and a hub portion connecting the tooth portion and the boss portion. The part of the gear where the strength requirement is strict is the tooth part. Therefore, it is conceivable to manufacture the teeth of plastic gears with high-strength FRP. Patent Documents 1 and 2 describe a method for molding an FRP tooth portion. Further, since the strength of the hub portion is not as high as that of the tooth portion, these documents describe molding with a conventional plastic or a compound in which short fibers are mixed with the plastic as the hub portion material. When the tooth portion is strengthened, the next portion that needs to be strengthened is the boss portion. When a load is applied to the tooth portion, a load equal to or greater than the tooth load is generated between the rotating shaft and the boss portion, particularly around the keyway for preventing slippage between the rotating shaft and the gear. Therefore, in order to take advantage of the increased strength of the tooth portion, the boss portion must be increased in strength.

ボス部を高強度化する案として文献１は金属ボスを使用している。文献２はボス部については特段の記載はなく、ハブ部とボス部は一体化しており、ボス部の強度はプラスチックあるいはプラスチックに短繊維を混ぜて作られるコンパウンドの強度となる。本発明では、キー溝を有する文献1の金属製ボスを歯部と同様にキー溝周りを含む周方向に連続した長繊維を有するFRP織物シートを多重に巻きかけ積層成形することにより歯部負荷以上の負荷に耐えられ、かつ、金属ボスより軽量なボスを実現する。さらに、上記周方向長繊維と斜向するように螺旋状にFRPシートを混合積層すればボス部の捩じり剛性を更に高めることができる。
文献３はボス部を同文献図３のようにFRPシートを同芯状に巻き付ける方法でボス部を製作する。この方法で得られた歯車にキー溝を設けるには、芯部内面に溝加工をほどこすことになり、巻き付けられたFRPシートの繊維はキー溝深さ相当部分が切断されるため、長繊維強度は得られずキー溝部の強度は大きく低下する。
なお、プラスチックあるいはコンパウンド製ハブ部をも連続繊維FRPで成形するとさらに高強度化ができる。 Document 1 uses a metal boss as a plan to increase the strength of the boss portion. Document 2 does not particularly describe the boss portion, the hub portion and the boss portion are integrated, and the strength of the boss portion is the strength of plastic or a compound made by mixing short fibers with plastic. In the present invention, the metal boss of Document 1 having a key groove is wound with multiple FRP woven sheets having long fibers continuous in the circumferential direction including the circumference of the key groove as in the case of the tooth portion, and the tooth portion is loaded. A boss that can withstand the above load and is lighter than a metal boss is realized. Further, if the FRP sheet is mixed and laminated spirally so as to be oblique to the long fibers in the circumferential direction, the torsional rigidity of the boss portion can be further increased.
In Document 3, the boss portion is manufactured by winding the FRP sheet concentrically as shown in FIG. 3 of the same document. In order to provide a keyway in the gear obtained by this method, the inner surface of the core must be grooved, and the fiber of the wound FRP sheet is cut at the portion corresponding to the keyway depth, so that it is a long fiber. The strength cannot be obtained and the strength of the keyway portion is greatly reduced.
If the hub part made of plastic or compound is also molded with continuous fiber FRP, the strength can be further increased.

本発明の歯車は金属製歯車と同程度ないしは以上の強度を有し、プラスチック歯車と同程度に軽量であり、現在使われている金属製あるいはプラスチック製歯車を代替できる。 The gear of the present invention has the same or higher strength than the metal gear, is as light as the plastic gear, and can replace the currently used metal or plastic gear.

本発明例Example of the present invention 本発明例の構成Configuration of the example of the present invention

歯部１は連続FRPシートを複数層巻きかけ積層する。その製法の一例が特許文献１あるいは２に記載されている。 A plurality of layers of continuous FRP sheets are wound around the tooth portion 1 and laminated. An example of the manufacturing method is described in Patent Document 1 or 2.

ハブ部２はプラスチックあるいは炭素繊維やガラス繊維等の短繊維とプラスチックからなるコンパウンドからなる一実施例であり、特許文献１、２にも記載されている。 The hub portion 2 is an example made of a compound made of plastic or short fibers such as carbon fiber or glass fiber and plastic, and is also described in Patent Documents 1 and 2.

ボス部３は、歯部同様、連続FRPシートを複数層巻きかけ積層成形する。ボス部内周からキー溝周りを含め外周まで繊維は連続している Like the tooth portion, the boss portion 3 is laminated by winding a plurality of layers of continuous FRP sheets. The fibers are continuous from the inner circumference of the boss to the outer circumference including around the keyway.

図１は本発明の複合材製歯車の概形例である。
図２は本発明の複合材製歯車の構成例である。 FIG. 1 is a schematic example of the composite gear of the present invention.
FIG. 2 is a configuration example of the composite gear of the present invention.

本発明は、現在主流である金属製歯車、プラスチック製歯車に対し、当二者の特長を併せ持つ、軽量・高強度のFRP歯車を提供する。FRP歯車は錆びず、転動音が小さい。機械装置に組み込まれている従来歯車の代替が可能であり、その強度の高さから、機械装置の小型化や高性能化に寄与する。 The present invention provides a lightweight, high-strength FRP gear that has the features of the two, as opposed to the metal gears and plastic gears that are currently mainstream. FRP gears do not rust and the rolling noise is small. It is possible to replace the conventional gears built into the mechanical device, and due to its high strength, it contributes to the miniaturization and high performance of the mechanical device.

１ FRP製歯部（周方向に連続繊維シートを積層）の例
２ コンパウンドプラスチック製ハブの例
３ FRP製ボス部(周方向に繊維が連続した繊維織物FRPシートを積層) 1 Example of FRP tooth part (laminated continuous fiber sheet in the circumferential direction) 2 Example of compound plastic hub 3 FRP boss part (laminated fiber woven FRP sheet with continuous fibers in the circumferential direction)

本発明の歯車は金属製歯車と同程度ないしは以上の強度を有し、プラスチック歯車と同程度に軽量であり、現在使われている金属製あるいはプラスチック製歯車を代替できる。特に、チェーン駆動を行う装置において、スプロケット重量の大きな部分をハブ部重量が占める。このハブ部に本願を適用すれば装置の軽量化を図ることができる。 The gear of the present invention has the same or higher strength than the metal gear, is as light as the plastic gear, and can replace the currently used metal or plastic gear. In particular, in a device for driving a chain, the weight of the hub portion occupies a large part of the weight of the sprocket. If the present application is applied to this hub portion, the weight of the device can be reduced.

Claims (1)

ボス部にキー溝を有する歯車において、ボス部がFRP連続繊維織物シートの積層により成形され、ボス部周方向に繊維がキー溝周りを含む内周から外周まで連続していることを特徴とする歯車 In a gear having a key groove in the boss portion, the boss portion is formed by laminating FRP continuous fiber woven sheets, and the fibers are continuous from the inner circumference including the circumference of the key groove to the outer circumference in the circumferential direction of the boss portion. gear
JP2020189925A 2019-12-03 2020-11-14 gear Pending JP2021092313A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019218785 2019-12-03
JP2019218785 2019-12-03

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JP2021092313A true JP2021092313A (en) 2021-06-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06218839A (en) * 1992-09-26 1994-08-09 Deutsche Forsch & Vers Luft Raumfahrt Ev Production of ring for gear having internal teeth and external teeth and use of said combination ring for forming internal gear and external gear
CN201162787Y (en) * 2008-01-25 2008-12-10 嘉兴学院 Anti-creep electric motor coupling spindle
JP2016083892A (en) * 2014-10-28 2016-05-19 株式会社ジェイテクト Gear, and manufacturing method of the gear

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06218839A (en) * 1992-09-26 1994-08-09 Deutsche Forsch & Vers Luft Raumfahrt Ev Production of ring for gear having internal teeth and external teeth and use of said combination ring for forming internal gear and external gear
CN201162787Y (en) * 2008-01-25 2008-12-10 嘉兴学院 Anti-creep electric motor coupling spindle
JP2016083892A (en) * 2014-10-28 2016-05-19 株式会社ジェイテクト Gear, and manufacturing method of the gear

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