JP2001208166A - Resin gear and method of manufacturing the same - Google Patents
Resin gear and method of manufacturing the sameInfo
- Publication number
- JP2001208166A JP2001208166A JP2000018505A JP2000018505A JP2001208166A JP 2001208166 A JP2001208166 A JP 2001208166A JP 2000018505 A JP2000018505 A JP 2000018505A JP 2000018505 A JP2000018505 A JP 2000018505A JP 2001208166 A JP2001208166 A JP 2001208166A
- Authority
- JP
- Japan
- Prior art keywords
- metal bush
- resin
- reinforcing fiber
- fiber base
- detent
- 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
Landscapes
- Gears, Cams (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属製ブッシュを
鋳込み成形した樹脂歯車とその製造法に関する。殊に、
金属製ブッシュとその周囲に配置した補強繊維基材とを
成形金型に収容し、成形金型に注入した液状樹脂を補強
繊維基材に含浸して金属製ブッシュを鋳込み成形した樹
脂歯車、すなわち、注入成形による樹脂歯車に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin gear formed by casting a metal bush and a method of manufacturing the same. In particular,
A resin gear in which a metal bush and a reinforcing fiber base material arranged around the metal bush are housed in a molding die, and a liquid resin injected into the molding die is impregnated into the reinforcing fiber base material and the metal bush is cast and molded. , A resin gear formed by injection molding.
【０００２】[0002]
【従来の技術】金属製ブッシュを鋳込み成形した樹脂歯
車は、金属製ブッシュと樹脂部分の結合強度を確保する
ことが重要である。上記注入成形による樹脂歯車の製造
は、成形金型を閉じたときの圧力で補強繊維基材を変形
させることにより、金属製ブッシュ外周面から放射状に
多数突出した回り止めを補強繊維基材に食い込ませた状
態とし、この状態で、成形金型に液状樹脂を注入して実
施する。前記液状樹脂の注入時ならびにその硬化時に補
強繊維基材が変形して前記食い込みが促進されることは
殆どなく、この点が、予め樹脂を含浸した補強繊維基材
を加熱加圧成形し金属製ブッシュを鋳込み成形する樹脂
歯車の製造と大きく異なっている。すなわち、前記加熱
加圧成形では、補強繊維基材が樹脂の流動と共に動いて
回り止め周囲に充填されるので、補強繊維基材を含む樹
脂部分と金属製ブッシュの結合が確実で結合強度も大き
くなる。それに対し、注入成形では、樹脂の流動に伴う
補強繊維基材の移動が起こりにくいので、回り止め周囲
への補強繊維基材の充填が不足になりがちである。2. Description of the Related Art In a resin gear formed by casting and molding a metal bush, it is important to ensure the bonding strength between the metal bush and the resin portion. In the production of the resin gear by the injection molding, the reinforcing fiber base is deformed by the pressure when the molding die is closed, so that a large number of detents radially protruding from the outer peripheral surface of the metal bush are cut into the reinforcing fiber base. In this state, a liquid resin is injected into a molding die and the operation is performed. At the time of injecting the liquid resin and at the time of curing thereof, the reinforcing fiber base material is hardly deformed and the biting is hardly promoted. This is significantly different from the manufacture of resin gears in which bushes are cast. That is, in the heat-press molding, the reinforcing fiber base moves with the flow of the resin and is filled around the detent, so that the resin portion including the reinforcing fiber base and the metal bush are securely connected and the bonding strength is large. Become. On the other hand, in the injection molding, since the movement of the reinforcing fiber base due to the flow of the resin hardly occurs, the filling of the reinforcing fiber base around the detent tends to be insufficient.
【０００３】強度、耐熱性、耐摩耗性、寸法安定性を高
度に求められる樹脂歯車（例えば、自動車部品用）にお
いては、補強繊維として繊維長を長くすること、高強度
のアラミド繊維を採用することなどが検討されている。
また、補強繊維基材の形態も、編み物、織布、繊維間を
ニードルパンチにより結合したフェルト状物などが検討
されている。このような場合の注入成形では、成形金型
を閉じる圧力で起こる補強繊維基材の変形が少なくな
る。[0003] In resin gears (for example, for automobile parts) which are required to have high strength, heat resistance, abrasion resistance and dimensional stability, the fiber length is to be lengthened and a high-strength aramid fiber is used as a reinforcing fiber. That is being considered.
In addition, knitted fabrics, woven fabrics, felt-like materials in which fibers are joined by needle punching, and the like have been studied as the form of the reinforcing fiber base material. In the injection molding in such a case, the deformation of the reinforcing fiber base caused by the pressure for closing the molding die is reduced.
【０００４】[0004]
【発明が解決しようとする課題】注入成形による樹脂歯
車おいては、成形金型を閉じる圧力で起こる補強繊維基
材の変形が少ないと、回り止め周囲への補強繊維基材の
充填が不足し、この部分は樹脂リッチとなる。補強繊維
基材の含有量が少ない樹脂リッチの部分は機械強度が小
さくなるので、金属製ブッシュと樹脂部分の結合強度が
低下する心配がある。In a resin gear formed by injection molding, if the deformation of the reinforcing fiber base caused by the closing pressure of the molding die is small, the filling of the reinforcing fiber base around the detent is insufficient. This portion becomes resin-rich. Since the resin-rich portion having a small content of the reinforcing fiber base material has low mechanical strength, there is a concern that the bonding strength between the metal bush and the resin portion may be reduced.
【０００５】本発明は、金属製ブッシュとその周囲に配
置した補強繊維基材とを成形金型に収容し、成形金型に
注入した液状樹脂を補強繊維基材に含浸して金属製ブッ
シュを鋳込み成形してなる、すなわち、注入成形による
樹脂歯車を対象としている。本発明が解決しようとする
課題は、前記樹脂歯車において、補強繊維基材を回り止
め周囲に十分に充填することにより、金属製ブッシュと
補強繊維基材を含む樹脂部分の結合強度を大きくするこ
とである。According to the present invention, a metal bush and a reinforcing fiber base disposed around the metal bush are housed in a molding die, and the reinforcing resin base is impregnated with a liquid resin injected into the molding die to form the metal bush. It is intended for resin gears formed by casting, that is, injection molding. The problem to be solved by the present invention is to increase the bonding strength between the metal bush and the resin part including the reinforcing fiber base by sufficiently filling the reinforcing fiber base around the detent in the resin gear. It is.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明に係る注入成形による樹脂歯車は、金属製ブ
ッシュが次のような構成を備えていることを特徴とす
る。すなわち、金属製ブッシュ外周面には多数の回り止
めが放射状に突出し、回り止め厚さは金属製ブッシュ厚
さよりも薄く、隣接する回り止め間にできる凹面は、金
属製ブッシュ面方向の断面形状が円弧状又はそれに近い
形状であることを特徴とする。In order to solve the above-mentioned problems, a resin gear by injection molding according to the present invention is characterized in that a metal bush has the following configuration. That is, a large number of detents project radially on the outer peripheral surface of the metal bush, the thickness of the detent is smaller than the thickness of the metal bush, and the concave surface formed between the adjacent detents has a cross-sectional shape in the metal bush surface direction. It is characterized by an arc shape or a shape close thereto.
【０００７】上述したように、注入成形における補強繊
維基材の回り止め周囲への充填は、成形金型を閉じたと
きの圧力で補強繊維基材が変形することにより行なわれ
る。円弧状又はそれに近い断面形状の上記凹面へは、変
形した補強繊維基材が滑るように入り込む。これに加え
て、回り止め厚さを金属製ブッシュ厚さより薄くするこ
とにより、回り止めは補強繊維基材中に埋没する。これ
らの作用により、補強繊維基材の回り止め周囲への充填
性は良好となり、回り止め周囲には補強繊維基材を含ま
ない樹脂リッチの部分ができにくい。樹脂リッチの部分
は機械強度が小さいので、金属製ブッシュの周囲に樹脂
リッチの部分ができると損傷しやすく、そこから始まっ
た損傷は樹脂歯車の歯の部分に向かって伝播しやすい。
しかし、本発明に係る樹脂歯車は、金属製ブッシュ周囲
に補強繊維基材が十分に充填されているので損傷しにく
く、その結果、金属製ブッシュと補強繊維基材を含む樹
脂部分の結合強度は大きいものとなる。As described above, the filling of the reinforcing fiber base around the detent in the injection molding is performed by the deformation of the reinforcing fiber base by the pressure when the molding die is closed. The deformed reinforcing fibrous base material slips into the concave surface having a circular arc shape or a sectional shape similar thereto. In addition, by making the thickness of the detent less than the thickness of the metal bush, the detent is buried in the reinforcing fiber substrate. Due to these effects, the filling property of the reinforcing fiber base around the detent is improved, and a resin-rich portion not containing the reinforcing fiber base is hardly formed around the detent. Since the resin-rich portion has low mechanical strength, the resin-rich portion is easily damaged when a resin-rich portion is formed around the metal bush, and the damage started therefrom is easily propagated toward the tooth portion of the resin gear.
However, the resin gear according to the present invention is hardly damaged because the reinforcing fiber base is sufficiently filled around the metal bush, and as a result, the bonding strength between the metal bush and the resin portion including the reinforcing fiber base is reduced. It will be big.
【０００８】金属製ブッシュ外周面に放射状に突出した
回り止めは、頂部の厚さが厚く基部の厚さが薄いアンダ
ーカット形状であることが望ましい。好ましくは、アン
ダーカットの掘り込み深さｄは、回り止め高さｈの３０
〜８５％である。It is desirable that the detents radially protruding from the outer peripheral surface of the metal bush have an undercut shape having a thick top portion and a thin base portion. Preferably, the digging depth d of the undercut is 30 of the detent height h.
~ 85%.
【０００９】樹脂歯車の回転時には、回り止めが樹脂部
分を剪断しようとする力が発生するが、回り止めをアン
ダーカット形状にすることにより断面で見たときの樹脂
部分の面積が増えるので、前記剪断力受ける側として好
都合である。また、樹脂部分の熱膨張率は金属製ブッシ
ュの熱膨張率より大きい。従って、熱膨張によって、樹
脂部分は金属製ブッシュから径方向へ離れようとする
が、上記のアンダーカット形状は、この動きを妨げるよ
うに作用する。尚、アンダーカットの掘り込み深さｄ
が、回り止め高さｈの８５％を越えると、回り止め基部
の強度が小さくなってくるので、８５％程度にとどめる
ことが好ましい。When the resin gear rotates, a force is generated by the detent to shear the resin portion. However, by forming the detent into an undercut shape, the area of the resin portion when viewed in cross section increases. It is convenient as the side receiving the shearing force. Further, the coefficient of thermal expansion of the resin portion is larger than the coefficient of thermal expansion of the metal bush. Therefore, the resin portion tends to move radially away from the metal bush due to thermal expansion, but the undercut shape acts to prevent this movement. The undercut depth d
However, if it exceeds 85% of the detent height h, the strength of the detent base decreases, so it is preferable to keep it at about 85%.
【００１０】このような注入成形による樹脂歯車は、次
のように製造する。金属製ブッシュとその周囲に配置し
た補強繊維基材とを成形金型に収容し、成形金型に液状
樹脂を注入して補強繊維基材に含浸し金属製ブッシュを
鋳込み成形するのであるが、前記金属製ブッシュとし
て、その外周面に多数の回り止めを放射状に突出させ、
回り止め厚さを金属製ブッシュの厚さより薄くし、隣接
する回り止め間にできる凹面の断面（金属製ブッシュ面
方向の断面）形状を円弧状又はそれに近い曲線にした構
成を採用する。そして、成形金型を閉じたときの圧力で
補強繊維基材を変形させることにより、回り止め周囲に
補強繊維基材を充填して、回り止めを補強繊維基材に食
い込ませた状態とする。この状態で、成形金型に液状樹
脂を注入して補強繊維基材に浸透させる。[0010] The resin gear by such injection molding is manufactured as follows. A metal bush and a reinforcing fiber base arranged around the metal bush are housed in a molding die, a liquid resin is injected into the molding die, the reinforcing fiber base is impregnated, and the metal bush is cast and molded. As the metal bush, a large number of detents are projected radially on the outer peripheral surface thereof,
The thickness of the detent is made smaller than the thickness of the metal bush, and a concave cross-section (cross-section in the direction of the metal bush) formed between adjacent detents is formed into an arc or a curve close thereto. Then, the reinforcing fiber base material is deformed by the pressure when the molding die is closed, so that the reinforcing fiber base material is filled around the detent and the detent is made to bite into the reinforcing fiber substrate. In this state, a liquid resin is injected into a molding die and penetrates the reinforcing fiber base material.
【００１１】[0011]
【発明の実施の形態】本発明においては、補強繊維基材
として種々の形態を採用することができる。例えば、図
４に示すように、アラミド繊維糸を織ったり編んだりし
て形成した筒状体１を軸方向に巻き上げリング状に形成
した補強繊維基材２である。そのほかにも、繊維間をニ
ードルパンチにより結合したフェルト状物を筒状ないし
はロール状に巻き、これを軸方向へ蛇腹状に圧縮した補
強繊維基材等を採用することができる。フェルト状物を
構成するアラミド繊維は、繊維長を５０mm程度にするの
が適当である。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, various forms can be adopted as a reinforcing fiber base material. For example, as shown in FIG. 4, a reinforcing fiber base 2 is formed by winding a tubular body 1 formed by weaving or knitting an aramid fiber yarn in an axial direction and forming a ring shape. In addition, it is possible to employ a reinforcing fiber base material or the like in which a felt-like material in which fibers are joined together by a needle punch is wound into a cylindrical or roll shape, and this is compressed in a bellows shape in the axial direction. It is appropriate that the aramid fiber constituting the felt-like material has a fiber length of about 50 mm.
【００１２】金属製ブッシュの周囲に上記の補強繊維基
材を配置して成形金型に収容し、補強繊維基材に樹脂を
含浸して、金属製ブッシュを鋳込み成形する。例えば、
図５に示すように、補強繊維基材２を成形金型２１内で
２段に重ね、中央には金属製ブッシュ１１を配置して、
成形金型２１を閉じる。成形金型を閉じるときの圧力で
補強繊維基材２を圧縮変形させて金属製ブッシュ１１の
形状になじませ、成形金型内を減圧にし、液状樹脂（架
橋ポリアミノアミド、エポキシ樹脂、ポリイミドなど）
を注入して補強繊維基材に浸透させ加熱硬化させる。補
強繊維基材を含む樹脂部分（外周）に切削加工により歯
を形成し、図２に示したような樹脂歯車とする。図２
（ａ）に示すように、金属製ブッシュ１１の外周面には
多数の回り止め１２が放射状に突出し、図２（ｂ）に示
すように、その回り止め１２の周囲に補強繊維基材が十
分に充填され、回り止め１２と補強繊維基材を含む樹脂
部分とが一体となっている。アラミド繊維、殊に、パラ
系アラミド繊維は極めて高強度である。パラ系アラミド
繊維だけで補強繊維基材を構成すると、上記の切削加工
性が低下するので、メタ系アラミド繊維を併用するとよ
い。両繊維の混紡糸で筒状体１を形成したり、両繊維を
併用してフェルト状物を構成する。両繊維の併用は、回
り止め周囲への補強繊維基材充填性を高める上でも好都
合である。The reinforcing fiber base is placed around a metal bush, accommodated in a molding die, and the reinforcing fiber base is impregnated with a resin, and the metal bush is cast and formed. For example,
As shown in FIG. 5, the reinforcing fiber base material 2 is stacked in two steps in a molding die 21, and a metal bush 11 is arranged in the center,
The molding die 21 is closed. The reinforcing fiber base material 2 is compressed and deformed by the pressure at the time of closing the molding die, conforms to the shape of the metal bush 11, and the pressure inside the molding die is reduced, and a liquid resin (crosslinked polyaminoamide, epoxy resin, polyimide, etc.)
Is injected and penetrated into the reinforcing fiber base to be cured by heating. The teeth are formed by cutting on the resin portion (outer periphery) including the reinforcing fiber base material to obtain a resin gear as shown in FIG. FIG.
As shown in FIG. 2A, a large number of detents 12 protrude radially from the outer peripheral surface of the metal bush 11, and as shown in FIG. And the detent 12 and the resin portion including the reinforcing fiber base are integrated. Aramid fibers, particularly para-aramid fibers, have extremely high strength. If the reinforcing fiber base is composed only of para-aramid fibers, the above-mentioned machinability is reduced. Therefore, it is preferable to use meta-aramid fibers in combination. The cylindrical body 1 is formed from a blended yarn of both fibers, or a felt-like material is formed by using both fibers in combination. The combined use of both fibers is also advantageous in enhancing the filling of the reinforcing fiber base around the detent.
【００１３】本発明において重要な点は、回り止め１２
の構成である。以下、発明の実施の形態を詳述する。図
１に示すように、回り止め１２は、金属製ブッシュ１１
の外周面に放射状に多数突出させるが、多数とは１０個
又はそれを越えるような個数、好ましくは１５個以上で
ある。これらを金属製ブッシュ１１の外周面に等角度で
配置する。回り止めを数個配置した程度では、１個の回
り止めが樹脂部分を剪断しようとする力が大きくなり、
樹脂部分が破壊されやすい。多数の回り止めを等角度で
配置することにより、１個の回り止めが樹脂部分を剪断
しようとする力は小さくなり、かつ、各回り止めの剪断
力は均一になる。回り止め間にできる凹面１３は、金属
製ブッシュ面方向の断面形状が円弧又はそれに近い曲線
である。円弧の半径Ｒは、補強繊維基材がパラ系アラミ
ド繊維とメタ系アラミド繊維の併用の場合、５〜２mm程
度が適当である。１mm程度になると、円弧状であっても
補強繊維基材の充填性が低下してくる。回り止め１２の
厚さは、金属製ブッシュ１１の厚さの１／３程度にする
のが適当である。図１（ｂ）に示すように、回り止め１
２は、頂部の厚さが厚く基部の厚さが薄いアンダーカッ
ト形状にするのが好ましいが、特に、アンダーカットの
掘り込み深さｄを回り止め高さｈの３０〜８５％にする
と、金属製ブッシュと樹脂部分の結合強度を一層大きく
することができる。An important point in the present invention is that the detent 12
It is a structure of. Hereinafter, embodiments of the present invention will be described in detail. As shown in FIG. 1, the detent 12 is a metal bush 11.
A large number is radially protruded from the outer peripheral surface of, but the number is 10 or more, preferably 15 or more. These are arranged at equal angles on the outer peripheral surface of the metal bush 11. When several detents are arranged, the force of one detent trying to shear the resin part increases,
The resin part is easily broken. By arranging a large number of detents at equal angles, the force of one detent trying to shear the resin portion is reduced, and the shear force of each detent is uniform. The concave surface 13 formed between the detents has a cross section in the direction of the surface of the metal bush which is a circular arc or a curve close thereto. When the reinforcing fiber base is a combination of para-aramid fibers and meta-aramid fibers, the radius R of the arc is suitably about 5 to 2 mm. When it is about 1 mm, the filling property of the reinforcing fiber base material is reduced even in the case of an arc shape. It is appropriate that the thickness of the detent 12 is about 1/3 of the thickness of the metal bush 11. As shown in FIG.
2 is preferably an undercut shape having a thick top portion and a thin base portion. In particular, when the digging depth d of the undercut is set to 30 to 85% of the detent height h, metal The bonding strength between the bush made of resin and the resin portion can be further increased.
【００１４】[0014]
【実施例】実施例 パラ系アラミド繊維とメタ系アラミド繊維の混紡糸（混
紡質量比５０／５０，２０番手）で織った筒状体１（目
付け量１３０ｇ／ｍ2）を準備した。この筒状体１を軸
方向に巻き上げてなる補強繊維基材２を２個用い、金属
製ブッシュ１１と共に、上記図５を参照して説明した方
法により、注入成形を行なった。補強繊維基材２への樹
脂含浸は、減圧状態（１３００Pa）にした成形金型２１
に架橋ポリアミノアミドを注入して行なった。ここで、
金属製（鋼製）ブッシュ１１は、厚さ９mm，回り止め１
２を含む外径５２mm，回り止め１２を含まない外径４９
mmである。回り止め１２は、１５°間隔で２４個配置さ
れている。その高さｈは１．５mm、頂部の厚さは３mmで
ある。回り止め間にできる凹面１３は、半径Ｒ３mm，深
さ１．３mmである。従って、凹面１３の最も深い箇所で
も回り止め１２を含まない外周面との間には０．２mmの
段差を生じている。成形した補強繊維基材を含む樹脂部
分は、外径８０mmであり、切削加工により外周に歯を形
成した（歯数２２）。上記の条件を一定にし、図１
（ｂ）を参照して説明したアンダーカットの掘り込み深
さｄを０，０．５，０．７５，１，１．２５mmの範囲で
変えた樹脂歯車を準備し、金属製ブッシュと樹脂部分の
結合強度を評価した。尚、掘り込み深さｄが０の場合
は、アンダーカット形状ではなく、回り止めの頂部から
基部まで同じ３mm厚さとした場合である。前記アンダー
カットの掘り込み深さｄを、回り止め高さｈに対する割
合に換算すると、それぞれ、０，３３，５０，６７，８
３％である。結合強度の評価は、固定した鋼製歯車に上
記各樹脂歯車を噛み合わせ、樹脂歯車の回転軸を捻じっ
て、金属製ブッシュと樹脂部分の界面の破壊荷重を測定
するものである。破壊荷重は、両者の結合部で樹脂部分
にクラックが発生する時点の大きさとした。クラック
は、いずれも樹脂部分と回り止めの界面から歯に向かっ
て入る。結果を、図３に示す。図３から、アンダーカッ
トの掘り込み深さｄが、回り止め高さｈの３０〜８５％
のときに、一層結合強度が顕著になることが分かる。EXAMPLES A cylindrical body 1 (basis weight 130 g / m 2 ) woven from a blended yarn of a para-aramid fiber and a meta-aramid fiber (mixing ratio 50/50, 20th count) was prepared. Injection molding was performed by using the two reinforcing fiber bases 2 formed by winding up the cylindrical body 1 in the axial direction and the metal bush 11 by the method described with reference to FIG. The resin impregnation into the reinforcing fiber base 2 is performed by using a molding die 21 in a reduced pressure state (1300 Pa).
The injection was carried out by injecting a crosslinked polyaminoamide. here,
The metal (steel) bush 11 has a thickness of 9 mm and a detent 1
Outer diameter 52mm including 2 and outer diameter 49 not including detent 12
mm. Twenty-four rotation stoppers 12 are arranged at intervals of 15 °. Its height h is 1.5 mm and its top thickness is 3 mm. The concave surface 13 formed between the detents has a radius R of 3 mm and a depth of 1.3 mm. Accordingly, even at the deepest point of the concave surface 13, a step of 0.2 mm is generated between the concave surface 13 and the outer peripheral surface not including the detent 12. The resin portion including the formed reinforcing fiber base material had an outer diameter of 80 mm, and teeth were formed on the outer periphery by cutting (22 teeth). With the above conditions kept constant, FIG.
A resin gear is prepared in which the undercut digging depth d described with reference to (b) is changed in the range of 0, 0.5, 0.75, 1, 1.25 mm, and a metal bush and a resin part are prepared. Was evaluated for bonding strength. When the digging depth d is 0, it is not the undercut shape but the same thickness of 3 mm from the top to the base of the detent. When the undercut dug depth d is converted into a ratio to the non-rotation height h, 0, 33, 50, 67, and 8 are obtained, respectively.
3%. In the evaluation of the bonding strength, each of the resin gears is engaged with a fixed steel gear, and the rotating shaft of the resin gear is twisted to measure a breaking load at an interface between the metal bush and the resin portion. The breaking load was the magnitude at which cracking occurred in the resin portion at the joint between the two. All cracks enter the teeth from the interface between the resin portion and the detent. The results are shown in FIG. From FIG. 3, the undercut digging depth d is 30 to 85% of the detent height h.
It can be seen that the bonding strength becomes more remarkable at the time.
【００１５】従来例 上記実施例において、凹面１３の断面形状を矩形にし
た。深さは１．３mmである。また、アンダーカットの掘
り込み深さｄを、０．７５mmとした。図６に、その金属
製ブッシュの平面図と要部拡大図を示す。実施例と同様
に破壊荷重を測定して結果を、図３に併せて示した。Conventional Example In the above embodiment, the cross section of the concave surface 13 was made rectangular. The depth is 1.3 mm. The undercut depth d was 0.75 mm. FIG. 6 shows a plan view and a main part enlarged view of the metal bush. The breaking load was measured in the same manner as in the example, and the results are shown in FIG.
【００１６】[0016]
【発明の効果】上述のように、本発明に係る注入成形に
よる樹脂歯車は、金属製ブッシュの回り止めの構成を特
定することにより、金属製ブッシュと樹脂部分の結合強
度を大きくすることができる。As described above, in the resin gear formed by injection molding according to the present invention, by specifying the structure of the metal bush, the joint strength between the metal bush and the resin portion can be increased. .
【図１】本発明に係る樹脂歯車に適用する金属製ブッシ
ュの平面図と要部拡大図（ａ）及びＡ−Ａ’線に沿う断
面図（ｂ）である。FIG. 1 is a plan view of a metal bush applied to a resin gear according to the present invention, an enlarged view of a main part (a), and a cross-sectional view taken along line AA ′ (b).
【図２】本発明に係る樹脂歯車の平面図（ａ）及びＢ−
Ｂ’線に沿う断面図（ｂ）である。FIG. 2 is a plan view (a) of a resin gear according to the present invention and FIG.
It is sectional drawing (b) along line B '.
【図３】樹脂歯車の金属製ブッシュと樹脂部分の界面の
破壊荷重を示す曲線図である。FIG. 3 is a curve diagram showing a breaking load at an interface between a metal bush of a resin gear and a resin portion.
【図４】本発明に係る樹脂歯車に適用する補強繊維基材
の一例を示す説明図である。FIG. 4 is an explanatory view showing an example of a reinforcing fiber base applied to the resin gear according to the present invention.
【図５】本発明に係る樹脂歯車を成形する様子を示す説
明図である。FIG. 5 is an explanatory view showing a state in which the resin gear according to the present invention is molded.
【図６】従来の樹脂歯車に適用する金属製ブッシュの平
面図と要部拡大図である。FIG. 6 is a plan view and an enlarged view of a main part of a metal bush applied to a conventional resin gear.
１は筒状体 ２は補強繊維基材 １１は金属製ブッシュ １２は回り止め １３は凹面 ２１は成形金型 1 is a cylindrical body 2 is a reinforcing fiber base 11 is a metal bush 12 is a detent 13 is a concave surface 21 is a molding die
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3J030 AC02 BB02 BC01 BC10 CA10 4F204 AA29 AA39 AA40 AB03 AD03 AD05 AD16 AD24 AH12 AK01 EA03 EB12 EF05 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J030 AC02 BB02 BC01 BC10 CA10 4F204 AA29 AA39 AA40 AB03 AD03 AD05 AD16 AD24 AH12 AK01 EA03 EB12 EF05
Claims (4)
繊維基材とを成形金型に収容し、成形金型に注入した液
状樹脂を補強繊維基材に含浸して金属製ブッシュを鋳込
み成形した樹脂歯車において、 前記金属製ブッシュの外周面には多数の回り止めが放射
状に突出し、回り止め厚さは金属製ブッシュの厚さより
薄く、隣接する回り止め間にできる凹面は金属製ブッシ
ュ面方向の断面形状が円弧状又はそれに近い曲線である
ことを特徴とする樹脂歯車。1. A metal bush and a reinforcing fiber substrate disposed around the metal bush are housed in a molding die, and the liquid resin injected into the molding die is impregnated into the reinforcing fiber substrate to cast and cast the metal bush. In the resin gear, a large number of detents radially protrude from the outer peripheral surface of the metal bush, the thickness of the detent is thinner than the thickness of the metal bush, and the concave surface formed between the adjacent detents is directed to the surface of the metal bush. Wherein the cross-sectional shape of the resin gear is an arc or a curve close thereto.
が薄いアンダーカット形状である請求項１記載の樹脂歯
車。2. The resin gear according to claim 1, wherein the detent has an undercut shape having a thick top portion and a thin base portion.
止め高さｈの３０〜８５％である請求項２記載の樹脂歯
車。3. The resin gear according to claim 2, wherein the depth d of the undercut is 30 to 85% of the non-rotating height h.
繊維基材とを成形金型に収容し、成形金型に液状樹脂を
注入して補強繊維基材に含浸し金属製ブッシュを鋳込み
成形する樹脂歯車の製造において、 前記金属製ブッシュとして、 その外周面に多数の回り止めを放射状に突出させ、 回り止め厚さを金属製ブッシュの厚さより薄くし、 隣接する回り止め間にできる凹面の断面（金属製ブッシ
ュ面方向の断面）形状を円弧状又はそれに近い曲線にし
た構成を採用し、 成形金型を閉じたときの圧力で補強繊維基材を変形させ
ることにより、回り止めを補強繊維基材に食い込ませた
状態とし、この状態で、成形金型に液状樹脂を注入する
ことを特徴とする樹脂歯車の製造法。4. A metal bush and a reinforcing fiber base arranged around the metal bush are housed in a molding die, a liquid resin is injected into the molding die, and the reinforcing fiber base is impregnated and the metal bush is cast and molded. In the manufacture of resin gears, a number of detents are projected radially on the outer peripheral surface of the metal bush, the thickness of the detent is made smaller than the thickness of the metal bush, and a concave surface formed between adjacent detents is formed. The cross section (cross section in the direction of the surface of the metal bush) has an arc shape or a curve close to it, and the reinforcing fiber base is deformed by the pressure when the molding die is closed, so that the detent is prevented from turning. A method of manufacturing a resin gear, characterized by injecting a liquid resin into a molding die in a state where the resin gear is cut into a base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000018505A JP3980239B2 (en) | 2000-01-27 | 2000-01-27 | Resin gear and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000018505A JP3980239B2 (en) | 2000-01-27 | 2000-01-27 | Resin gear and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001208166A true JP2001208166A (en) | 2001-08-03 |
| JP3980239B2 JP3980239B2 (en) | 2007-09-26 |
Family
ID=18545348
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000018505A Expired - Lifetime JP3980239B2 (en) | 2000-01-27 | 2000-01-27 | Resin gear and manufacturing method thereof |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007063422A1 (en) | 2006-12-19 | 2008-07-17 | Suzuki Motor Corporation, Hamamatsu | Plastic gear |
| CN102734428A (en) * | 2012-06-19 | 2012-10-17 | 无锡宇吉科技有限公司 | Ratchet wheel |
| JP2019048431A (en) * | 2017-09-12 | 2019-03-28 | 株式会社Ｓｕｂａｒｕ | Metal-fiber-reinforced resin bonded member and method of manufacturing the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5589606B2 (en) | 2010-06-28 | 2014-09-17 | 日本ガスケット株式会社 | Resin rotating body and manufacturing method thereof |
-
2000
- 2000-01-27 JP JP2000018505A patent/JP3980239B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007063422A1 (en) | 2006-12-19 | 2008-07-17 | Suzuki Motor Corporation, Hamamatsu | Plastic gear |
| US7814809B2 (en) | 2006-12-19 | 2010-10-19 | Suzuki Motor Corporation | Plastic gear |
| DE102007063422B4 (en) * | 2006-12-19 | 2012-03-22 | Suzuki Motor Corporation | Plastic gear |
| CN102734428A (en) * | 2012-06-19 | 2012-10-17 | 无锡宇吉科技有限公司 | Ratchet wheel |
| JP2019048431A (en) * | 2017-09-12 | 2019-03-28 | 株式会社Ｓｕｂａｒｕ | Metal-fiber-reinforced resin bonded member and method of manufacturing the same |
| JP7026466B2 (en) | 2017-09-12 | 2022-02-28 | 株式会社Subaru | Metal-fiber reinforced resin joint member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3980239B2 (en) | 2007-09-26 |
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