JP5168345B2 - Synthetic resin pulley with integrated bearing - Google Patents
Synthetic resin pulley with integrated bearing Download PDFInfo
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- JP5168345B2 JP5168345B2 JP2010262916A JP2010262916A JP5168345B2 JP 5168345 B2 JP5168345 B2 JP 5168345B2 JP 2010262916 A JP2010262916 A JP 2010262916A JP 2010262916 A JP2010262916 A JP 2010262916A JP 5168345 B2 JP5168345 B2 JP 5168345B2
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本発明は、軸受一体型合成樹脂プーリに関し、特に、自動車エンジンの補機あるいはカムシャフトを駆動するためのベルトあるいはタイミングベルト用のテンションナー、あるいはアイドラーとして、前記ベルトに所望の張力を付与するための軸受一体型合成樹脂プーリに関する。 TECHNICAL FIELD The present invention relates to a bearing-integrated synthetic resin pulley, and more particularly, to apply a desired tension to a belt or timing belt tensioner or idler for driving an auxiliary machine of an automobile engine or a camshaft. The present invention relates to a bearing-integrated synthetic resin pulley.
従来、自動車エンジンの補機あるいはカムシャフトを駆動するためのベルトあるいはタイミングベルトに所望の張力を付与するためのプーリとしては、軸受一体型合成樹脂プーリが広く使用されている。合成樹脂プーリは金属性プーリに比べて軽量化およびコストの低減化を図ることができるが、反面、強度的に弱いという問題がある。 Conventionally, a bearing-integrated synthetic resin pulley has been widely used as a pulley for applying a desired tension to a belt for driving an auxiliary machine of an automobile engine or a camshaft or a timing belt. Synthetic resin pulleys can be reduced in weight and cost as compared with metallic pulleys, but have a problem that they are weak in strength.
現在使用されている軸受一体型合成樹脂プーリの構造としては、図５（ａ）、（ｂ）に示すように、玉軸受Ｔｚと玉軸受の外周に固定された樹脂プーリ６ｚから構成されている。 As shown in FIGS. 5 (a) and 5 (b), the structure of the bearing-integrated synthetic resin pulley currently used is composed of a ball bearing Tz and a resin pulley 6z fixed to the outer periphery of the ball bearing. .
樹脂プーリ６ｚは内周面６２０ｚが玉軸受Ｔｚの外輪１ｚに固着される内側円筒部６２ｚと、外周面６１０ｚがベルト案内面となる外側円筒部６１ｚと、内外円筒部を連結する連結部６３ｚとから一体に構成され、連結部６３ｚには外側円筒部６１ｚの半径方向の強度を補強するために所定の厚さの補強リブ６６ｚを連結部６３ｚの両面に円周方向等間隔に放射線状に設けた構造になっていて、軽量化、コスト低減化、補強に対応した形状になっている。 The resin pulley 6z includes an inner cylindrical portion 62z whose inner peripheral surface 620z is fixed to the outer ring 1z of the ball bearing Tz, an outer cylindrical portion 61z whose outer peripheral surface 610z serves as a belt guide surface, and a connecting portion 63z that connects the inner and outer cylindrical portions. In order to reinforce the strength of the outer cylindrical portion 61z in the radial direction, the connecting portion 63z is radially provided on both surfaces of the connecting portion 63z at equal intervals in the circumferential direction. It has a shape that corresponds to weight reduction, cost reduction, and reinforcement.
射出成形品は、成形後、表面部と内部の冷却時間の差によって表面部と内部に体積収縮時間差が生じ引けといわれている変形が部分的に生じる。プーリのベルト案内面となる外周面に引けによって凹凸等の変形が生じると、案内面として適切でない形状となり、振動や異音の原因になったり、ベルトとのスリップの問題が生じる。 In the injection molded product, after molding , a difference in volume shrinkage time occurs between the surface portion and the inside due to a difference in cooling time between the surface portion and the inside, and a deformation that is said to be attracted partially occurs. If deformation such as unevenness occurs due to the pulling on the outer peripheral surface which becomes the belt guide surface of the pulley, the shape becomes inappropriate as the guide surface, which may cause vibration and noise, or cause a problem of slippage with the belt.
現行のプーリは射出成形の場合の引け発生をできるだけ少なくするために内側円筒部６２ｚ、外側円筒部６１ｚ、連結部６３ｚ、補強リブ６６ｚの厚さ寸法をできるだけ近似の寸法にするなど工夫がなされている。しかし、このように工夫をしても、外周面６１０ｚの円周方向において、内方に補強リブ６６ｚの存在するところと存在しないところの外周面６１０ｚでは、変形の程度が異なって凹凸が生じてしまい、補強リブ数が増えると凹凸数が増えてしまう。これらの凹凸は小さなものであるが、この小さな凹凸でも、プーリの回転速度や、荷重が、将来益々増加する傾向にあって、現在それほど問題になっていないレベルでも、将来、振動や異音で問題になる虞がある。この引けの問題を改善する提案として、例えば、特許文献１の内容が提案されている。 In order to minimize the occurrence of shrinkage in the case of injection molding as much as possible, the present pulley has been devised such that the thickness dimensions of the inner cylindrical portion 62z, the outer cylindrical portion 61z, the connecting portion 63z, and the reinforcing rib 66z are as approximate as possible. Yes. However, even with such a contrivance, in the circumferential direction of the outer peripheral surface 610z, the outer peripheral surface 610z where the reinforcing rib 66z is present inward and the outer peripheral surface 610z where the reinforcing rib 66z does not exist are different in degree of deformation and uneven. Therefore, when the number of reinforcing ribs increases, the number of irregularities increases. These irregularities are small, but even with these small irregularities, the rotational speed and load of the pulley tend to increase in the future. May be a problem. For example, the content of Patent Document 1 has been proposed as a proposal for improving the close problem.
しかしながら、特許文献１は、引けの問題に関しては、有効な対策の一つであるが、上記で述べた小さな凹凸によって生じる振動や異音の問題については言及していない。さらに、プーリの異音や振動、スリップのもう一つの原因としてインサート成形によって生じる軸受の回転中心とベルト案内面となるプーリ外周面との偏心の問題があり、この問題に関しても触れていない。 However, Patent Document 1 is an effective measure for the problem of shrinkage, but does not mention the problem of vibration and noise caused by the small unevenness described above. Furthermore, there is a problem of eccentricity between the rotation center of the bearing caused by insert molding and the outer peripheral surface of the pulley serving as the belt guide surface as another cause of the noise, vibration and slip of the pulley, and this problem is not mentioned.
軸受一体型合成樹脂プーリを射出成形によって成形する場合、図６を参照しながら説明する。 The case where the bearing-integrated synthetic resin pulley is molded by injection molding will be described with reference to FIG.
上型Ｕ１ｚと下型Ｌ１ｚからなる金型内の所定位置に玉軸受Ｔｚを配置し、前記金型に形成されるプーリ形状をしたキャビティＣｚに溶融樹脂を流し込むことで、軸受の外輪に樹脂プーリ６ｚが固着された軸受一体型合成樹脂プーリが成形される。図６はキャビティ内に樹脂が注入された後を示している。 A ball bearing Tz is arranged at a predetermined position in a mold composed of an upper mold U 1 z and a lower mold L 1 z, and molten resin is poured into a pulley-shaped cavity Cz formed in the mold, thereby A bearing-integrated synthetic resin pulley having the resin pulley 6z fixed to the outer ring is molded . FIG. 6 shows the state after the resin is injected into the cavity.
このとき金型の所定位置にころがり軸受を配置固定するのにコアピンＵ２ｚ，Ｌ２ｚを用いている。コアピンと軸受の内輪の嵌め合いは作業上、ゆるい嵌め合いにする必要があるから、すきまの分だけ軸受の内輪と成形される樹脂プーリ外周面との間に偏心が生じてしまう。この偏心は回転によって、振動や異音、スリップの原因となる。 At this time, the core pins U 2 z and L 2 z are used to arrange and fix the rolling bearings at predetermined positions of the mold. Since the fitting of the core pin and the inner ring of the bearing needs to be loosely fitted for work, an eccentricity is generated between the inner ring of the bearing and the outer peripheral surface of the resin pulley to be formed by the clearance. This eccentricity causes vibration, abnormal noise, and slip due to rotation.
また、プーリの連結部６３ｚを成形するキャビティ部６３ｚｃ及び補強リブ６６ｚを成形するキャビティ部６６ｚｃに注入された溶融樹脂が成形後に冷却された際に、キャビティ部６１ｚｃで成形された外側円筒部６１ｚの外周面６１０ｚに、引けによって小さな凹凸が発生する。この小さな凹凸も、将来、振動や異音で問題になる虞がある。 Further, when the molten resin injected into the cavity portion 66zc for molding the cavity 63zc and the reinforcing ribs 66z molding the connecting portion 63z of the pulley is cooled after molding, the outer cylindrical portion 61z which are molded in the cavity portion 61zc Small irregularities are generated on the outer peripheral surface 610z by shrinkage. This small unevenness may also become a problem in the future due to vibration and abnormal noise.
前述の引けから発生するベルト案内面の凹凸およびインサート成形時の偏心による問題の両方を防止するには、樹脂材料の成形加工特性の把握、精密で複雑な金型の製作、成形条件の厳密な管理などが必要になる。また、成形時の作業の煩雑さ、それによるコストと時間の増大が伴うことになる。 In order to prevent both the unevenness of the belt guide surface caused by the above-mentioned shrinkage and the problem due to eccentricity during insert molding , it is possible to grasp the molding processing characteristics of resin materials, manufacture precise and complicated molds , and strictly apply molding conditions. Management is required. In addition, the work at the time of molding is complicated, resulting in an increase in cost and time.
本発明は、このような点に鑑みなされたもので、樹脂材料の成形加工特性の把握、精密で複雑な金型の製作、成形条件の厳密な管理などを必要とすることなく、ベルト案内面の小さな凹凸およびインサート成形時の偏心の両方を防止し、異音や振動の発生を起こさないで、しかも、作業の煩雑さ、それによるコストアップを避けたインサート成形による軽量な軸受一体型合成樹脂プーリを提供することを目的としている。 The present invention has been made in view of the above points, and without requiring grasping of molding processing characteristics of a resin material, production of a precise and complicated mold , strict management of molding conditions, and the like. Lightweight bearing-integrated synthetic resin by insert molding that prevents both small unevenness and eccentricity during insert molding , does not cause abnormal noise and vibration, and avoids complicated work and cost increase The purpose is to provide a pulley.
上記の目的を達成するため、本発明は、
外輪と、内輪と、前記外内輪の間に介装された複数の転動体とからなるころがり軸受の外輪外周部に、前記内輪内径面にコアピンを接触させて軸受全体を金型で覆うインサート成形により形成した合成樹脂プーリを固着してなり、
該合成樹脂プーリはベルト案内用の外周面を有する外側円筒部と、内径側が前記外輪外周部に嵌合固着された内側円筒部と、前記外側円筒部と前記内側円筒部とを連結する連結部とを有し、
前記連結部の両側面には前記外側円筒部の半径方向強度を補強する補強リブを円周方向にわたり所定の間隔で放射状に設けてある軸受一体型合成樹脂プーリにおいて、
前記外輪の外周面に円周溝を有し、かつ
前記合成樹脂プーリの前記外周面は、回転中心に対する偏心量が小さくなるように前記合成樹脂プーリの回転中心を基準として切削又は研削された面であることを特徴とする軸受一体型合成樹脂プーリを提供する。
In order to achieve the above object, the present invention provides:
Insert molding that covers the entire bearing with a die by bringing a core pin into contact with the inner surface of the inner ring on the outer ring outer periphery of a rolling bearing comprising an outer ring, an inner ring, and a plurality of rolling elements interposed between the outer and inner rings. The synthetic resin pulley formed by
The synthetic resin pulley has an outer cylindrical portion having an outer peripheral surface for belt guidance, an inner cylindrical portion whose inner diameter side is fitted and fixed to the outer peripheral portion of the outer ring, and a connecting portion that connects the outer cylindrical portion and the inner cylindrical portion. And
In the bearing-integrated synthetic resin pulley in which reinforcing ribs that reinforce the radial strength of the outer cylindrical portion are provided radially at predetermined intervals on both side surfaces of the connecting portion,
A surface having a circumferential groove on the outer peripheral surface of the outer ring, and the outer peripheral surface of the synthetic resin pulley cut or ground on the basis of the rotation center of the synthetic resin pulley so as to reduce the amount of eccentricity with respect to the rotation center A bearing-integrated synthetic resin pulley is provided.
本発明は、前記円周溝が、前記回転中心の中心軸に直交する面に対して傾斜していることが好ましい。
また、本発明は、前記内側円筒部の内周面の軸方向の略中央部に、前記円周溝に樹脂が注入され形成された中央環状突起を有することが好ましい。
さらに、本発明は、前記内側円筒部の内周面の軸方向の両端部に、前記内周面よりも内方に突き出た両端環状突起を有することが好ましい。
本発明はまた、前記補強リブを、前記連結部の両側面で位相を変えて設けることが好ましい。
さらにまた本発明において、前記合成樹脂プーリは、ポリアミド6、ポリアミド11、ポリアミド12、ポリアミド66、ポリアミド46、ポリアミド610、ポリアミド612、芳香族ポリアミド、非晶性ポリアミドの単独または複数を混合したもの、ポリフェニレンサルファイド(ＰＰＳ)、フェノール樹脂の何れかを母材として、ガラス繊維、タルク、マイカの単独又は複数を添加した複合材料からなることが好ましい。
In the present invention, it is preferable that the circumferential groove is inclined with respect to a plane orthogonal to the central axis of the rotation center .
In the present invention, it is preferable that a central annular protrusion formed by injecting resin into the circumferential groove is formed at a substantially central portion of the inner peripheral surface of the inner cylindrical portion in the axial direction.
Furthermore, in the present invention, it is preferable that both end portions in the axial direction of the inner peripheral surface of the inner cylindrical portion have both-end annular protrusions protruding inward from the inner peripheral surface.
In the present invention, it is preferable that the reinforcing rib is provided with a phase change on both side surfaces of the connecting portion.
Furthermore, in the present invention, the synthetic resin pulley is polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 46, polyamide 610, polyamide 612, aromatic polyamide, or a mixture of amorphous polyamide, It is preferably made of a composite material in which any of polyphenylene sulfide (PPS) and phenol resin is used as a base material and glass fiber, talc and mica are added alone or in combination.
本発明によれば、樹脂材料の成形加工特性の把握、精密で複雑な金型の製作、成形条件の厳密な管理などを必要とすることなく、ベルト案内面の凹凸およびインサート成形時の偏心の両方を防止し、異音や振動の発生を起こさないで、しかも、作業の煩雑さ、それによるコストアップを避けたインサート成形による軽量な軸受一体型合成樹脂プーリを提供することができる。 According to the present invention, the unevenness of the belt guide surface and the eccentricity at the time of insert molding can be achieved without the need to grasp the molding processing characteristics of the resin material, manufacture a precise and complicated mold , and strictly control the molding conditions. It is possible to provide a lightweight bearing-integrated synthetic resin pulley by insert molding that prevents both of them, does not cause abnormal noise and vibration, and avoids complicated work and cost increase.
以下、本発明に係わる実施形態及び参考例を図面を参照しつつ説明する。 Hereinafter, embodiments and reference examples according to the present invention will be described with reference to the drawings.
（参考例）
図１によって本発明の参考例の軸受一体型合成樹脂プーリＰｕを説明する。
同図は、本参考例の断面図を示している。
軸受一体型合成樹脂プーリＰｕは玉軸受Ｔの外輪１に合成樹脂製のプーリ６が嵌合固着されている。
( Reference example )
A bearing-integrated synthetic resin pulley Pu according to a reference example of the present invention will be described with reference to FIG.
This figure shows a cross-sectional view of this reference example .
In the bearing-integrated synthetic resin pulley Pu, a synthetic resin pulley 6 is fitted and fixed to the outer ring 1 of the ball bearing T.
玉軸受Ｔの外輪１は内周部に内周軌道１ａを有し、外周面には回転中心Ｘ−Ｘに直交する面に対して所定の角度θだけ傾いた円周溝１１を有している。 The outer ring 1 of the ball bearing T has an inner circumferential track 1a on the inner circumferential portion, and a circumferential groove 11 inclined on the outer circumferential surface by a predetermined angle θ with respect to a plane orthogonal to the rotation center XX. Yes.
内輪２は、外周部に外輪の内周軌道１ａに対向する外周軌道２ａを有している。 The inner ring 2 has an outer peripheral track 2a facing the inner peripheral track 1a of the outer ring on the outer peripheral portion.
ボール３は外輪の内周軌道１ａと内輪の外周軌道２ａとの間に複数個介装されて、外内輪の相対回転を許容している。 A plurality of balls 3 are interposed between the inner race 1a of the outer ring and the outer race 2a of the inner ring to allow relative rotation of the outer inner race.
保持器４はボール３を保持している。 The cage 4 holds the ball 3.
シール５は玉軸受Ｔの両端部において、内外輪の空間を密閉している。 The seal 5 seals the space of the inner and outer rings at both ends of the ball bearing T.
樹脂プーリ６は外側円筒部６１と内側円筒部６２と両円筒部を連結する連結部６３からなっている。外側円筒部６１の外周面６１０がベルト案内面になっている。内側円筒部６２の内周面６２０は、外輪１の外周面と嵌合固定される。連結部６３の両側面６４は平面であり、その両側に大きな空間が設けられて、重量軽減のための逃げ部６５となっている。連結部６３の厚さは、外側円筒部の厚さとの関係で、外周面６１においてベルトに負荷が掛かりながら、ベルト案内する際に受ける荷重に対して強度を維持できる程度に選択することができる。外周面６１０は、回転中心Ｘ−Ｘを基準として、切削や砥石による研削などの機械加工面に仕上げられている。そのため。回転中心Ｘ−Ｘを基準とした外周面６１０の偏心量は小さく管理できる。特に、研削では数ミクロンの精度が確保できる。 The resin pulley 6 includes an outer cylindrical portion 61, an inner cylindrical portion 62, and a connecting portion 63 that connects both cylindrical portions. An outer peripheral surface 610 of the outer cylindrical portion 61 is a belt guide surface. The inner peripheral surface 620 of the inner cylindrical portion 62 is fitted and fixed to the outer peripheral surface of the outer ring 1. Both side surfaces 64 of the connecting portion 63 are flat surfaces, and large spaces are provided on both sides thereof to serve as escape portions 65 for weight reduction. The thickness of the connecting portion 63 can be selected so as to maintain the strength against the load received when guiding the belt while the belt is loaded on the outer peripheral surface 61 in relation to the thickness of the outer cylindrical portion. . The outer peripheral surface 610 is finished to a machined surface such as cutting or grinding with a grindstone with the rotation center XX as a reference. for that reason. The amount of eccentricity of the outer peripheral surface 610 based on the rotation center XX can be managed small. In particular, grinding can ensure a precision of several microns.
内周面６２０は、両端部において、内周面６２０よりも内方に突き出た両端環状突起６２１を有していて、外輪１と樹脂プーリ６との軸方向の固着を確実にしている。また、内周面６２０の軸方向の略中央部に、回転中心Ｘ−Ｘに直交する面に対して所定の角度θだけ傾いた中央環状突起６２２が形成される。この中央環状突起６２２は後述するように、インサート成形時に溶融した樹脂が外輪の円周溝１１に注入された結果形成されたものであり、外輪と樹脂の線膨張係数の差によって生じる嵌合面の円周方向クリープを防止している。 The inner peripheral surface 620 has both end annular projections 621 protruding inward from the inner peripheral surface 620 at both ends, and ensures the axial fixation between the outer ring 1 and the resin pulley 6. Further, a substantially central portion in the axial direction of the inner peripheral surface 620, a central annular projection 622 which is inclined by a predetermined angle θ for the surface perpendicular to the rotation center X-X is formed. As will be described later, the center annular protrusion 622 is formed as a result of the resin melted at the time of insert molding being injected into the circumferential groove 11 of the outer ring, and is a fitting surface caused by the difference in linear expansion coefficient between the outer ring and the resin. Prevents circumferential creep.
つぎに、軸受一体型合成樹脂プーリのインサート成形に関し図２を参照しながら説明する。 Next, insert molding of a bearing-integrated synthetic resin pulley will be described with reference to FIG.
図２は参考例をインサート成形する金型の部分断面図で、金型にすでに樹脂が注入されている状態を示す。 FIG. 2 is a partial cross-sectional view of a mold for insert- molding a reference example , and shows a state where resin is already injected into the mold.
玉軸受Ｔが上型Ｕ１と下型Ｌ１からなり、両型間にキャビティＣを有するインサート成形金型の上部コアピン部Ｕ２，下部コアピン部Ｌ２に配置される。溶融樹脂が注入部(図示略)から、キャビティＣ内に注入される。このキャビティＣは樹脂プーリと同一形状をしている。両コアピン部の外径寸法と内輪の内径寸法との差は作業性の面から数ミクロンから１０数ミクロンのすきまが出るように設定されている。注入されたキャビティ内の樹脂は、射出成形後に、金型に近い部分から先に冷却され、金型から遠い部分、すなわち内部が遅く冷却される。そのために成形完了後に先に冷却された部分の変形(引け)が生じる。ベルト案内面となる外周面に変形（引け）が生じるので、成形後は、偏心と、変形を持った状態になっている。樹脂プーリ６の内周面は外輪の円周溝１１に樹脂が注入されるので、中央環状突起６２２が形成されることになる。 The ball bearing T is composed of an upper mold U 1 and a lower mold L 1 and is disposed in an upper core pin part U 2 and a lower core pin part L 2 of an insert molding die having a cavity C between both molds. Molten resin is injected into the cavity C from an injection portion (not shown). The cavity C has the same shape as the resin pulley. The difference between the outer diameter of both core pins and the inner diameter of the inner ring is set so that a clearance of several microns to several tens of microns is obtained from the viewpoint of workability. After the injection molding, the injected resin in the cavity is cooled first from the portion close to the mold, and the portion far from the mold, that is, the inside is cooled slowly. For this reason, deformation (squeezing) of the previously cooled portion occurs after the completion of molding. Since deformation (shrinkage) occurs on the outer peripheral surface serving as the belt guide surface, after molding, the belt is eccentric and deformed. Since resin is injected into the circumferential groove 11 of the outer ring on the inner peripheral surface of the resin pulley 6, a central annular protrusion 622 is formed.
図１に示す本参考例は、射出成形後に回転中心Ｘ−Ｘを基準として、外周面を切削もしくは研削などの方法によって、前述の偏心と凹凸などの適切でない形状を修正したものである。 This reference example shown in FIG. 1 is obtained by correcting the above-mentioned inappropriate shapes such as eccentricity and unevenness by a method such as cutting or grinding of the outer peripheral surface with reference to the rotation center XX after injection molding.
この参考例では、射出成形後に樹脂プーリ６の外周面６１０を切削もしくは研削を施すので、引けから発生するベルト案内面の凹凸およびインサート成形時の偏心による問題の両方を防止することが出来、樹脂材料の成形加工特性の把握、精密で複雑な金型の製作、成形条件の厳密な管理などを必要としない。また、成形時の作業の煩雑さ、それによるコストと時間の増大が伴うことはない。 In this reference example , since the outer peripheral surface 610 of the resin pulley 6 is cut or ground after injection molding, both the unevenness of the belt guide surface caused by shrinkage and the problem due to eccentricity during insert molding can be prevented. There is no need to understand the molding characteristics of materials, manufacture precise and complex molds , and strictly control molding conditions. In addition, there is no complicated work during molding, and no increase in cost and time.
（実施形態）
次に、実施形態１を図３（ａ）、（ｂ）を参照しながら説明する。
(Embodiment)
Next, Embodiment 1 will be described with reference to FIGS. 3 (a) and 3 (b).
図３（ａ）は本実施形態の正面図を示している。図３(ｂ)は図３(ａ)の矢視Ａ−Ａの断面図を示している。 FIG. 3A shows a front view of the present embodiment . FIG.3 (b) has shown sectional drawing of arrow AA of Fig.3 (a).
本実施形態の軸受一体型合成樹脂プーリＰｕは外周面がベルト案内面となる外側円筒部６１と、互いに同心に設けられた内周面が軸受の外輪に固着される内側円筒部６２と、内外円筒部を連結する円環状の連結部６３とから構成されている。連結部６３には外側円筒部６１の半径方向の強度を補強するために所定の厚さの補強リブ６６を連結部の両側面に円周方向等間隔に放射線状に複数設けた構造になっていて、軽量化、コスト低減化、補強に対応した形状になっている。補強リブ６６間は空間部６７になっていてプーリをさらに軽量にしている。補強リブ６６は外側円筒部６１、内側円筒部６２および連結部６３と一体に成形されている。両側面に設けてある補強リブ６６の円周方向の位置は互いに一致させている。補強リブの数は、適宜設定することが出来る。 The bearing-integrated synthetic resin pulley Pu of this embodiment includes an outer cylindrical portion 61 whose outer peripheral surface is a belt guide surface, an inner cylindrical portion 62 whose inner peripheral surfaces are concentrically fixed to the outer ring of the bearing, It is comprised from the annular connection part 63 which connects a cylindrical part. In order to reinforce the strength of the outer cylindrical portion 61 in the radial direction, the connecting portion 63 has a structure in which a plurality of reinforcing ribs 66 having a predetermined thickness are provided radially at equal intervals in the circumferential direction on both side surfaces of the connecting portion. Therefore, it has a shape corresponding to weight reduction, cost reduction, and reinforcement. A space 67 is formed between the reinforcing ribs 66 to further reduce the weight of the pulley. The reinforcing rib 66 is formed integrally with the outer cylindrical portion 61, the inner cylindrical portion 62 and the connecting portion 63. The circumferential positions of the reinforcing ribs 66 provided on both side surfaces are made to coincide with each other. The number of reinforcing ribs can be set as appropriate.
本実施形態の場合、成形後に外周面に生じる凹凸は、円周方向において、外周面６１０の内方に補強リブ６６があるところと無いところで変形の程度が異なるために生じる凹凸であるが、その凹凸は小さく、機械加工によって修正する時間が短くて済む。 In the case of this embodiment, the unevenness generated on the outer peripheral surface after molding is an unevenness generated due to the difference in the degree of deformation in the circumferential direction where the reinforcing rib 66 is present and where the reinforcing rib 66 is not present. The unevenness is small, and the time required for correction by machining is short.
なお、本実施形態では、補強リブ６６は、円周方向で互いに位置を一致させているが、両側面で、適宜、位相を変えて実施してもよい。 In this embodiment , the positions of the reinforcing ribs 66 coincide with each other in the circumferential direction. However, the reinforcing ribs 66 may be appropriately changed in phase on both side surfaces.
樹脂プーリ６と玉軸受Ｔとのインサート成形による固着については、図２に示す方法をとることが出来る。ただし、本実施形態の場合は、金型のキャビティ形状は、本変形例のプーリの形状にすることは当然のことである。また、外輪外周部とプーリ内周部との固着についても実施形態１と同一である。さらに、また、インサート成形によって、樹脂プーリと軸受を一体化した後に、プーリ外周部を研削や切削など機械加工することも参考例と同一である。 The method shown in FIG. 2 can be used for fixing the resin pulley 6 and the ball bearing T by insert molding . However, in the case of this embodiment , it is natural that the cavity shape of the mold is the shape of the pulley of this modification. Further, the fixation between the outer peripheral portion of the outer ring and the inner peripheral portion of the pulley is the same as in the first embodiment. Furthermore, after the resin pulley and the bearing are integrated by insert molding , the outer peripheral portion of the pulley is machined, such as grinding or cutting, as in the reference example .
なお、参考例と同一部位、同一符号については説明を省略している。
次に、本発明の効果を確認するために行った実験について図４を参照しながら説明する。
In addition, description is abbreviate | omitted about the same site | part and the same code | symbol as a reference example .
Next, an experiment conducted for confirming the effect of the present invention will be described with reference to FIG.
本試験に使用する試験品は、実施形態１に示した軸受一体型合成樹脂プーリと同じ構造であり、本発明の実施品である。 Specimens used in this study is the same structure as the bearing integrated synthetic resin pulley shown in embodiment 1, that is a product of the present invention.
樹脂プーリの外周面寸法;７０ミリ、樹脂材料;ガラス繊維強化ポリアミド６６(商品名、アミラン ＣＭ３００６Ｇ−３０)、成形条件;前記樹脂を溶融させた状態で１００°Ｃの温度に調整された金型のキャビティ内に射出圧力１００ＭＰａで注入した。 Outer surface dimensions of resin pulley; 70 mm, resin material; glass fiber reinforced polyamide 66 (trade name, Amilan CM3006G-30), molding conditions; mold adjusted to a temperature of 100 ° C. with the resin melted Was injected at an injection pressure of 100 MPa.
溶融樹脂が冷却固化した後に成形品を取り出し、軸受の内径基準でプーリ外周面に切削加工を施し、試験品とした。 After the molten resin was cooled and solidified, the molded product was taken out, and the pulley outer peripheral surface was cut based on the inner diameter of the bearing to obtain a test product.
本試験は図４に示す試験機を用いた。この試験機は一対の回転軸にそれぞれ固定された駆動輪Ｄ１と従動輪Ｄ２との間にベルトＢを掛け渡し、このベルトＢの外周面の一部に試験プーリＴｐを荷重Ｆにより押し付ける。この試験プーリは図示しない固定部分に対し、変位自在に支持した支持軸に玉軸受Ｔの内輪を外嵌固定している。試験プーリＴｐとして、上記実施品および比較例の樹脂製プーリを組み込んで行った。試験品、比較例から１００ミリメートル離れた位置での音圧(ｄＢ)を測定した。なお、回転速度Ｓ;５０００ｒ．ｐ．ｍ／ｍｉｎ，押し付け荷重Ｆ;１２００Ｎである。音圧測定器は「ＳＯＵＮＤ ＬＥＶＥＬ ＭＥＴＥＲ ＲＩＯＮＮＡ−２４」である。 The test machine shown in FIG. 4 was used for this test. In this testing machine, a belt B is stretched between a driving wheel D 1 and a driven wheel D 2 fixed to a pair of rotating shafts, and a test pulley Tp is pressed against a part of the outer peripheral surface of the belt B by a load F. . In this test pulley, an inner ring of a ball bearing T is externally fitted and fixed to a support shaft that is supported in a displaceable manner with respect to a fixed portion (not shown). As the test pulley Tp, the above-mentioned product and the resin pulley of the comparative example were incorporated. The sound pressure (dB) at a position 100 mm away from the test product and the comparative example was measured. Rotational speed S: 5000 r. p. m / min, pressing load F; 1200N. The sound pressure measuring device is “SOUND LEVEL METER RIONNA-24”.
試験結果は表１のようであり、本発明の実施品は比較例１，２に比べ音圧が低い。 The test results are as shown in Table 1, and the product of the present invention has a lower sound pressure than Comparative Examples 1 and 2.
以上、本発明の実施品の効果を説明してきたが、本発明の樹脂プーリを構成する樹脂材料としては、ポリアミド6、ポリアミド11、ポリアミド12、ポリアミド66、ポリアミド46、ポリアミド610、ポリアミド612、芳香環を有する芳香族ポリアミド、シクロ環を有する非昌性ポリアミドの単独または複数を混合したもの、ポリフェニレンサルファイド(ＰＰＳ)、フェノール樹脂を母材としてガラス繊維などの強化繊維やタルク、マイカなどのミネラル等充填剤を添加した複合材料を使用できる。 As described above, the effect of the product of the present invention has been described. As the resin material constituting the resin pulley of the present invention, polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 46, polyamide 610, polyamide 612, aromatic Aromatic polyamides having a ring, non-changing polyamides having a cyclo ring, or a mixture of a plurality of non-changing polyamides, polyphenylene sulfide (PPS), phenolic resin as a base material, reinforcing fibers such as glass fibers, minerals such as talc and mica, etc. A composite material to which a filler is added can be used.
Ｐｕ：軸受一体型合成樹脂プーリ
Ｔ：玉軸受
１：外輪
１１：円周溝
２：内輪
３：ボール
４：保持器
５：シール
６：樹脂プーリ
６１：外側円筒部
６１０：外周面
６２：内側円筒部
６２０：内周面
６２１：両端環状突起
６２２：中央環状突起
６３：連結部
６４：両側面
６５:逃げ部
６６:補強リブ
６７:空間部
Ｕ１：上型
Ｕ２：上部コアピン部
Ｌ１：下型
Ｌ２：下部コアピン部
Ｃ：キャビティ
Pu: Bearing-integrated synthetic resin pulley T: Ball bearing 1: Outer ring 11: Circumferential groove 2: Inner ring 3: Ball 4: Cage 5: Seal 6: Resin pulley 61: Outer cylindrical portion 610: Outer cylindrical surface 62: Inner cylindrical part 620: inner peripheral surface 621: across the annular projection 622: central annular projection 63: connecting portion 64: both side surfaces 65: escape portion 66: reinforcing rib 67: space portion U 1: upper die U 2: upper core pin portion L 1: Lower mold L 2 : Lower core pin part C: Cavity
Claims (6)
該合成樹脂プーリはベルト案内用の外周面を有する外側円筒部と、内径側が前記外輪外周部に嵌合固着された内側円筒部と、前記外側円筒部と前記内側円筒部とを連結する連結部とを有し、
前記連結部の両側面には前記外側円筒部の半径方向強度を補強する補強リブを円周方向にわたり所定の間隔で放射状に設けてある軸受一体型合成樹脂プーリにおいて、
前記外輪の外周面に円周溝を有し、かつ
前記合成樹脂プーリの前記外周面は、回転中心に対する偏心量が小さくなるように前記合成樹脂プーリの回転中心を基準として切削又は研削された面であることを特徴とする軸受一体型合成樹脂プーリ。 Insert molding that covers the entire bearing with a die by bringing a core pin into contact with the inner surface of the inner ring on the outer ring outer periphery of a rolling bearing comprising an outer ring, an inner ring, and a plurality of rolling elements interposed between the outer and inner rings. The synthetic resin pulley formed by
The synthetic resin pulley has an outer cylindrical portion having an outer peripheral surface for belt guidance, an inner cylindrical portion whose inner diameter side is fitted and fixed to the outer peripheral portion of the outer ring, and a connecting portion that connects the outer cylindrical portion and the inner cylindrical portion. And
In the bearing-integrated synthetic resin pulley in which reinforcing ribs that reinforce the radial strength of the outer cylindrical portion are provided radially at predetermined intervals on both side surfaces of the connecting portion,
A surface having a circumferential groove on the outer peripheral surface of the outer ring, and the outer peripheral surface of the synthetic resin pulley cut or ground on the basis of the rotation center of the synthetic resin pulley so as to reduce the amount of eccentricity with respect to the rotation center A synthetic resin pulley with an integrated bearing.
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| JP3506739B2 (en) * | 1993-09-28 | 2004-03-15 | Ｎｔｎ株式会社 | Synthetic resin pulley |
| JP4352508B2 (en) * | 1999-05-27 | 2009-10-28 | 日本精工株式会社 | Resin pulley |
| JP4186205B2 (en) * | 2001-03-07 | 2008-11-26 | 株式会社ジェイテクト | Bearing with resin pulley |
| JP2003065424A (en) * | 2001-08-28 | 2003-03-05 | Koyo Seiko Co Ltd | Method for manufacturing bearing with resin-made pulley and outer ring of bearing |
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