JP2006220176A - Synthetic resin gear - Google Patents

Synthetic resin gear Download PDF

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Publication number
JP2006220176A
JP2006220176A JP2005031940A JP2005031940A JP2006220176A JP 2006220176 A JP2006220176 A JP 2006220176A JP 2005031940 A JP2005031940 A JP 2005031940A JP 2005031940 A JP2005031940 A JP 2005031940A JP 2006220176 A JP2006220176 A JP 2006220176A
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Japan
Prior art keywords
web
rim
boss
synthetic resin
resin gear
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JP2005031940A
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Japanese (ja)
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JP2006220176A5 (en
Inventor
Kiyobumi Hiroi
清文 廣井
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Tigers Polymer Corp
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Tigers Polymer Corp
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Publication date
Application filed by Tigers Polymer Corp filed Critical Tigers Polymer Corp
Priority to JP2005031940A priority Critical patent/JP2006220176A/en
Publication of JP2006220176A publication Critical patent/JP2006220176A/en
Publication of JP2006220176A5 publication Critical patent/JP2006220176A5/ja
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provided a synthetic resin gear injection-molded with high dimensional accuracy. <P>SOLUTION: The synthetic resin gear comprises a cylindrical boss 2 into the axial hole of which a rotating shaft, not illustrated, is integrally fitted, an annular web 3 extending from the outer peripheral face of the boss 2 to the radial direction, and an annular rim 4 expanding from the outer periphery of the web 3 to the radial direction. A prescribed pitch tooth portion 5 is formed on the outer peripheral face of the rim 4. The web 3 has a first web portion 3a connected to the vicinity of the cross center of the rim 4, a stepped portion 3b, and a second web portion 3c connected to the vicinity of the cross end of the boss 2. The radial length of the first web portion 3a is smaller than that of the second web portion 3c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、合成樹脂製歯車、特に高い寸法精度を持つ合成樹脂製歯車に関するものである。 The present invention relates to a synthetic resin gear, and more particularly to a synthetic resin gear having high dimensional accuracy.

従来、一般に、ウェブのある円筒射出成形品、例えば、合成樹脂製歯車において、ウェブの肉厚が厚い時には、ウェブの径方向の収縮により、ウェブと同位置に相当する円筒外周面がヒケて凹んだり、薄い時には突っ張って凸んだり、外周面の直径寸法、真円度、同軸度、振れなどが悪化する問題があり、これを解消する必要があった。特許文献１には、外周側円筒部の幅方向端部から外周側円筒部と円板状部との接続部に向かうにしたがって、外周側円筒部の肉厚を漸減させることにより、外周側円筒部の収縮量が幅方向に沿ってほぼ均等化し、外周側円筒部と円板状部との接続部におけるヒケの発生を抑えることができるため、外形形状の高精度化を図ることができるとの記載がされている。
特開２００４−１３８１３７号公報 Conventionally, in general, in a cylindrical injection molded product having a web, for example, a synthetic resin gear, when the web is thick, the cylindrical outer peripheral surface corresponding to the same position as the web is indented and dented due to shrinkage in the radial direction of the web. However, there is a problem that the diameter, roundness, concentricity, runout, etc. of the outer peripheral surface worsen when it is thin, and it is necessary to solve this problem. In Patent Document 1, the outer peripheral side cylinder portion is gradually reduced from the widthwise end of the outer peripheral side cylindrical portion toward the connecting portion between the outer peripheral side cylindrical portion and the disk-shaped portion, thereby reducing the outer peripheral side cylindrical portion. The amount of shrinkage of the part can be substantially equalized along the width direction, and the occurrence of sink marks at the connecting part between the outer cylindrical part and the disk-like part can be suppressed. Is described.
JP 2004-138137 A

しかしながら、この外周面の凹凸を無くすためには、ウェブやリムの肉厚を調整し成形条件と共にトライアンドエラーを繰り返すことが必要になる。しかも、強度上、ウェブやリムの肉厚調整にも図面上の限度があり、凹凸を改善できない場合が多くあった。 However, in order to eliminate the irregularities on the outer peripheral surface, it is necessary to adjust the thickness of the web and rim and repeat the trial and error together with the molding conditions. In addition, due to strength, there is a limit on the thickness adjustment of the web and rim, and there are many cases where unevenness cannot be improved.

上記問題を解決するため本発明者らは、鋭意研究を重ねた結果、従来全く考えられていなかったボスとリムの間に一体連結するウェブを階段状に形成し、リムからウェブの階段状部までの距離を極力短く形成することで、寸法精度の高い合成樹脂製歯車を得られることを知見し、本発明を完成するに至ったものである。 In order to solve the above problems, the present inventors have conducted extensive research and, as a result, formed a stepped web that is integrally connected between the boss and the rim, which has never been considered in the past. It has been found that a synthetic resin gear having high dimensional accuracy can be obtained by forming the distance up to as short as possible, and the present invention has been completed.

すなわち、本発明は、中心部に形成されたボス、ボスの外周方向に同心円上に形成されたリム、ボスとリムの間に一体連結された階段状のウェブ、リムの外周部に形成された歯部からなる合成樹脂製歯車であって、上記ウェブは、リムの幅方向中央付近に連結された第１ウェブ部，段差部及びボスの幅方向端部付近に連結された第２ウェブ部を有し、第１ウェブ部の径方向長さが第２ウェブ部のそれに比して短く形成されていることを手段としたものである。 That is, the present invention is formed on the boss formed at the center, the rim formed concentrically in the outer circumferential direction of the boss, the step-like web integrally connected between the boss and the rim, and the outer rim of the rim. A synthetic resin gear comprising tooth portions, wherein the web includes a first web portion connected near the center in the width direction of the rim, a step portion, and a second web portion connected near the end in the width direction of the boss. And the length of the first web portion in the radial direction is shorter than that of the second web portion.

本発明によれば、ウェブを階段状に形成し、リムからウェブの階段状部までの距離を極力短く形成することで、リム及び歯部に影響するウェブの収縮影響を軽減させ、外周面の凹凸を解消させることができる。なお、本発明の合成樹脂製歯車は、平歯歯車だけではなくハスバ歯車等であってもよい。 According to the present invention, the web is formed in a stepped shape, and the distance from the rim to the stepped portion of the web is made as short as possible to reduce the shrinkage effect of the web that affects the rim and the tooth portion, and Unevenness can be eliminated. The synthetic resin gear of the present invention may be a helical gear or the like as well as a spur gear.

以下、本発明による合成樹脂製歯車を平歯歯車に応用した実施例を参照して説明する。 Hereinafter, the synthetic resin gear according to the present invention will be described with reference to an embodiment in which it is applied to a spur gear.

図１は本願発明の合成樹脂製歯車を平歯歯車に応用した平面図であって、合成樹脂製歯車１は、図示しない回転軸がその軸孔に一体的に嵌着される円筒状のボス２と、このボス２の外周面からその外周方向に延びる環状のウェブ３と、このウェブ３の外周から外周方向に広がる環状のリム４とからなり、リム４の外周面には所定ピッチの歯部５から構成されている。 FIG. 1 is a plan view in which a synthetic resin gear of the present invention is applied to a spur gear. A synthetic resin gear 1 is a cylindrical boss in which a rotating shaft (not shown) is integrally fitted in a shaft hole. 2, an annular web 3 extending in the outer circumferential direction from the outer peripheral surface of the boss 2, and an annular rim 4 extending in the outer circumferential direction from the outer periphery of the web 3. It consists of part 5.

図２は、図１中のＡ−Ａ矢視断面図であって、ボス２とリム４の間に一体連結されているウェブ３は第１ウェブ部３ａ，段差部３ｂ，第２ウェブ部３ｃで構成され、第１ウェブ部３ａはリム４の幅方向中央付近の位置でリム４と連結され、段差部３ｂを介して、第２ウェブ部３ｃはボス２の幅方向端部付近の位置でボス２と連結されている。上記第１ウェブ部３ａの径方向における長さは上記第２ウェブ部３ｃのそれに比して極端に短く形成してある。 2 is a cross-sectional view taken along the line AA in FIG. 1, and the web 3 integrally connected between the boss 2 and the rim 4 includes a first web portion 3a, a step portion 3b, and a second web portion 3c. The first web portion 3a is connected to the rim 4 at a position near the center of the rim 4 in the width direction, and the second web portion 3c is located at a position near the width direction end of the boss 2 via the step portion 3b. It is connected to the boss 2. The length of the first web portion 3a in the radial direction is extremely shorter than that of the second web portion 3c.

本願発明の合成樹脂製歯車を平歯歯車に応用した平面図である。It is a top view which applied the synthetic resin gear of the present invention to a spur gear. 図１中のＡ−Ａ矢視断面図である。It is AA arrow sectional drawing in FIG.

符号の説明Explanation of symbols

１ 合成樹脂製歯車
２ ボス
３ ウェブ
３ａ 第１ウェブ部
３ｂ 段差部
３ｃ 第２ウェブ部
４ リム
５ 歯部

DESCRIPTION OF SYMBOLS 1 Synthetic resin gear 2 Boss 3 Web 3a 1st web part 3b Step part 3c 2nd web part 4 Rim 5 Tooth part

Claims (1)

中心部に形成されたボス、ボスの外周方向に同心円上に形成されたリム、ボスとリムの間に一体連結された階段状のウェブ、リムの外周部に形成された歯部からなる合成樹脂製歯車であって、上記ウェブは、リムの幅方向中央付近に連結された第１ウェブ部，段差部及びボスの幅方向端部付近に連結された第２ウェブ部を有し、第１ウェブ部の径方向長さが第２ウェブ部のそれに比して短く形成されている合成樹脂製歯車。 A synthetic resin comprising a boss formed in the center, a rim formed concentrically in the outer circumferential direction of the boss, a stepped web integrally connected between the boss and the rim, and a tooth formed on the outer periphery of the rim. The gear has a first web portion connected near the center in the width direction of the rim, a step portion, and a second web portion connected near the end portion in the width direction of the boss. A synthetic resin gear in which the radial length of the portion is shorter than that of the second web portion.
JP2005031940A 2005-02-08 2005-02-08 Synthetic resin gear Pending JP2006220176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005031940A JP2006220176A (en) 2005-02-08 2005-02-08 Synthetic resin gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005031940A JP2006220176A (en) 2005-02-08 2005-02-08 Synthetic resin gear

Publications (2)

Publication Number Publication Date
JP2006220176A true JP2006220176A (en) 2006-08-24
JP2006220176A5 JP2006220176A5 (en) 2007-08-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8100026B2 (en) * 2006-06-07 2012-01-24 Enplas Corporation Plastic injection-molded gear

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07180761A (en) * 1993-11-04 1995-07-18 Robert Bosch Gmbh Holder for transmission gear on shaft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07180761A (en) * 1993-11-04 1995-07-18 Robert Bosch Gmbh Holder for transmission gear on shaft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8100026B2 (en) * 2006-06-07 2012-01-24 Enplas Corporation Plastic injection-molded gear

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