JP4269530B2 - Bearing with resin pulley and manufacturing method thereof - Google Patents

Bearing with resin pulley and manufacturing method thereof Download PDF

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JP4269530B2
JP4269530B2 JP2001063113A JP2001063113A JP4269530B2 JP 4269530 B2 JP4269530 B2 JP 4269530B2 JP 2001063113 A JP2001063113 A JP 2001063113A JP 2001063113 A JP2001063113 A JP 2001063113A JP 4269530 B2 JP4269530 B2 JP 4269530B2
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bearing
cylindrical portion
diameter cylindrical
cavity
resin
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JP2002266990A (en
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忠弘 寺田
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JTEKT Corp
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JTEKT Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、自動車のタイミングベルトや補機駆動ベルト等において、ベルトの張力調整や走行経路の変更のために使用されるアイドラ軸受やテンショナ軸受等に好適な樹脂プーリ付き軸受に関する。
【０００２】
【従来の技術】
従来より、自動車の補機にエンジンの回転動力を伝達するための補機駆動用ベルト等で使用される軸受には、その重量軽減ならびにコスト削減のため、転がり軸受の金属製の外輪の外周面に合成樹脂製のプーリを一体成形してなる樹脂プーリ付き軸受が用いられている。
【０００３】
従来の樹脂プーリ付き軸受４０の一例を、図４および図５を用いて説明する。樹脂プーリ付き軸受４０は、転がり軸受４１の外周に樹脂プーリ４２を一体成形してなる。転がり軸受４１は、内輪４３、外輪４４、玉やころの転動体４５等にて構成されている。また、樹脂プーリ４２は、転がり軸受４１の外輪４４に固着した内径円筒部４６と、ベルト案内面４８を有する外径円筒部４７と、内径円筒部４６と外径円筒部４７の間に設けた円板部４９とから構成されている。
【０００４】
樹脂プーリ４２は、合成樹脂の射出成形によって製造している。すなわち、図６に示すように、上型５０と下型５１の間に転がり軸受４１を芯出し固定し、上型５０と下型５１とスライド型５７の周りのキャビティに溶融樹脂を充填する。
【０００５】
ここで、５２は内径円筒部４６用のキャビティ、５３は外径円筒部４７用のキャビティ、５４は円板部４９用のキャビティである。また、内径円筒部用のキャビティ５２の片端面には、ランナ５６に接続されたゲート孔５５が開口している。
【０００６】
樹脂プーリ４２の成形に際しては、成形金型に転がり軸受４１をセットした状態で、ランナ５６を介してゲート孔５５から溶融樹脂を充填する。各キャビティ５２，５３，５４内に充填された溶融樹脂は固化し、型開きを行って樹脂プーリ４２が形成される。
【０００７】
【発明が解決しようとする課題】
樹脂プーリ４２の射出成形に際し、各ゲート孔５５から注入された溶融樹脂ｒは、内径円筒部用のキャビティ５２内を軸受の軸方向に流入する。内径円筒部用のキャビティ５２内を流れる溶融樹脂ｒが円板部用のキャビティ５４部分に達すると、円板部用のキャビティ５４内に流れ込む。これは、円板部４９の軸受軸方向の厚みＦが、内径円筒部４６の軸受径方向の厚みＥより大きく、溶融樹脂ｒは抵抗の少ない厚肉の円板部用のキャビティ５４内に進もうとするためである。ただし、溶融樹脂ｒの全てが円板部用のキャビティ５４内に流入するのではなく、一部は内径円筒部用のキャビティ５２内をゲート孔５５の反対側端面Ｓに向かって進む。
【０００８】
円板部用のキャビティ５４内に流入した溶融樹脂ｒ1は、外径円筒部用のキャビティ５３内に流入する。外径円筒部用のキャビティ５３内に溶融樹脂ｒ1が完全に充填されると、内径円筒部用のキャビティ５２のゲート孔５５の反対側端面Ｓにも溶融樹脂ｒ2が充填される。
【０００９】
このように、内径円筒部用のキャビティ５２のゲート孔５５の反対側端面Ｓには、外径円筒部用のキャビティ５３内に溶融樹脂ｒ1が充填された後、溶融樹脂ｒ2が充填されるため、当該反対側端面Ｓでは溶融樹脂ｒ2の充填に時間がかかってしまう。そのため、溶融樹脂ｒ2が完全に充填される前に反対側端面Ｓに流入した溶融樹脂ｒ2が硬化し、外径円筒部用のキャビティ５３内に溶融樹脂ｒ1が完全に充填された後に、反対側端面Ｓに溶融樹脂ｒ2が流入できなくなり、反対側端面Ｓ部分に空洞が生じたり、あるいは、先に流入した溶融樹脂ｒ2の合流部にて発生するウェルド部の接合強度が低下することがあった。
【００１０】
空洞が生じると、樹脂プーリ４２の反対側端面Ｓ部分において強度が著しく低下する。また、反対側端面Ｓは転がり軸受４１の外輪４４の近傍に位置するため、ウェルド部の接合強度が低下すると、使用時に、樹脂製のプーリ４２と金属製の外輪４４との線膨張係数の違いによって、当該ウェルド部分を起点として、樹脂プーリ４２にクラックが発生する。これらの結果、樹脂プーリ４２が破損するという問題があった。
【００１１】
この発明は、樹脂プーリの内径円筒部におけるゲート孔の反対側端面に空洞やウェルド部の接合強度が低下するのを抑制し、樹脂プーリの破損を防止することができる樹脂プーリ付き軸受およびその製造方法を提供することを目的とする。
【００１２】
【課題を解決するための手段】
本発明の請求項１は、転がり軸受の外輪の外周面に樹脂製のプーリを一体成形した樹脂プーリ付き軸受であって、前記樹脂プーリは、片端面に樹脂注入用ゲート孔が配置され、かつ前記転がり軸受の外輪に固着する内径円筒部と、ベルト案内面を有する外径円筒部と、内外径円筒部間に設けられた円板部とを有し、前記内径円筒部の軸受径方向の厚みを、前記円板部の軸受軸方向の厚みより大きくしたことを特徴とするものである。
【００１３】
なお、内径円筒部の軸受径方向の厚みＡと、円板部の軸受軸方向の厚みＢとの好ましい関係は、０．７×Ａ≦Ｂ≦０．９５×Ａである。
【００１４】
本発明の請求項１の樹脂プーリ付き軸受によると、樹脂プーリの内径円筒部の軸受径方向の厚みを、円板部の軸受軸方向の厚みより大きくしたことで、内径円筒部の片端面のゲート孔より注入した溶融樹脂が、ゲート孔の反対側端面に流入して充填された後、円板部を通して外径円筒部に流入するため、内径円筒部におけるゲート孔の反対側端面に溶融樹脂が素早く充填され、空洞やウェルド部の接合強度が低下するのを抑制できる。
【００１５】
本発明の請求項２は、転がり軸受の外輪の外周面に樹脂製のプーリを一体成形した樹脂プーリ付き軸受であって、片端面に樹脂注入用ゲート孔が配置され、かつ前記樹脂プーリは、前記転がり軸受の外輪に固着する内径円筒部と、ベルト案内面を有する外径円筒部と、内外径円筒部間に設けられた円板部およびその円板部に放射状に形成された複数の補強リブとを有し、前記内径円筒部の軸受径方向の厚みを、前記円板部の軸受軸方向の厚みより大きくしたことを特徴とするものである。
【００１６】
なお、内径円筒部の軸受径方向の厚みＡと、円板部の軸受軸方向の厚みＢとの好ましい関係は、０．７×Ａ≦Ｂ≦０．９５×Ａである。
【００１７】
本発明の請求項２の樹脂プーリ付き軸受によると、樹脂プーリの内径円筒部の軸受径方向の厚みを、円板部の軸受軸方向の厚みより大きくしたことで、内径円筒部の片端面のゲート孔より注入した溶融樹脂が、ゲート孔の反対側端面に流入して充填された後、円板部を通して外径円筒部に流入するため、内径円筒部におけるゲート孔の反対側端面に溶融樹脂が素早く充填され、空洞やウェルド部の接合強度が低下するのを抑制できる。しかも、内径円筒部の軸受径方向の厚みが円板部の軸受軸方向の厚みより大きくなるように、円板部の厚みを薄くしても、円板部に放射状に形成した複数の補強リブによって補強できる。
【００１８】
本発明の請求項４は、転がり軸受の外輪の外周面に樹脂製のプーリを一体成形する樹脂プーリ付き軸受の製造方法であって、片端面に樹脂注入用ゲート孔を有した内径円筒部用のキャビティと、外径円筒部用のキャビティと、内外径円筒部のキャビティ間に設けられた円板部用のキャビティとからなり、前記内径円筒部用のキャビティの軸受径方向の厚みを前記円板部用のキャビティの軸受軸方向の厚みより大きくした成形金型内に、転がり軸受を配置して型締めする型締工程と、前記ゲート孔から溶融樹脂をキャビティ内に射出し、前記内径円筒部用のキャビティの前記ゲート孔とは反対側端面に充填した後、前記円板部用のキャビティと前記外径円筒部用のキャビティとを充填する射出工程とを含む方法である。
【００１９】
本発明の請求項４の樹脂プーリ付き軸受の製造方法によると、成形金型の内径円筒部用のキャビティの軸受径方向の厚みを、円板部用のキャビティの軸受軸方向の厚みより大きくしたことで、内径円筒部用のキャビティの片端面のゲート孔より注入した溶融樹脂が、ゲート孔の反対側端面に流入して充填された後、円板部用のキャビティを通して外径円筒部用のキャビティに流入するため、樹脂プーリの内径円筒部におけるゲート孔の反対側端面に溶融樹脂が素早く充填され、空洞やウェルド部の接合強度が低下するのを抑制できる。
【００２０】
【発明の実施の形態】
（実施の形態１）
本発明の実施の形態１について、図１および図２を用いて説明する。
【００２１】
図１は、転がり軸受１１の外周に樹脂プーリ１２を一体成形してなる樹脂プーリ付き軸受１０の部分断面図を示している。転がり軸受１１は、内輪１３、外輪１４、玉やころの転動体１５等にて構成されている。また、樹脂プーリ１２は、転がり軸受１１の外輪１４に固着した内径円筒部１６と、ベルト案内面１８を有する外径円筒部１７と、内径円筒部１６と外径円筒部１７の間に設けた円板部１９とから構成されている。
【００２２】
内径円筒部１６の軸受径方向の厚みＡは、円板部１９の軸受軸方向の厚みＢより大きく形成されている。厚みＡと厚みＢの関係は、Ａ＞Ｂであればよいが、好ましくは、０．７×Ａ≦Ｂ≦０．９５×Ａとする。
【００２３】
次に、樹脂プーリ１２の成形について、図２を用いて説明する。
【００２４】
図２において、成形金型は上型２０と下型２１とスライド型２７とからなり、２２は内径円筒部１６用のキャビティ、２３は外径円筒部１７用のキャビティ、２４は円板部１９用のキャビティである。また、内径円筒部用のキャビティ２２の片端面には、ランナ２６に接続されたゲート孔２５が開口している。
【００２５】
樹脂プーリ１２の成形に際しては、成形金型に転がり軸受１１をセットした状態で、ランナ２６を介してゲート孔２５から溶融樹脂を充填する。各キャビティ２２，２３，２４内に充填された溶融樹脂は固化し、型開きを行って樹脂プーリ１２が形成される。
【００２６】
樹脂プーリ１２の射出成形に際し、各ゲート孔２５から注入された溶融樹脂Ｒは、内径円筒部用のキャビティ２２内を軸受の軸方向に流入する。内径円筒部用のキャビティ２２内を流れる溶融樹脂Ｒが円板部用のキャビティ２４部分に達すると、そのまま内径円筒部用のキャビティ２２内をゲート孔２５の反対側端面Ｓに向かって流れ込む。これは、内径円筒部１６の軸受径方向の厚みＡが、円板部１９の軸受軸方向の厚みＢより大きく、溶融樹脂Ｒは抵抗の少ない厚肉の内径円筒部用のキャビティ２２内に進もうとするためである。ただし、溶融樹脂Ｒの全てが内径円筒部用のキャビティ２２内を反対側端面Ｓに向かって進むのではなく、一部は円板部用のキャビティ２４内に流れ込む。
【００２７】
内径円筒部用のキャビティ２２内のゲート孔２５の反対側端面Ｓに溶融樹脂Ｒ1が完全に充填されると、円板部用のキャビティ２４内に流入した溶融樹脂Ｒ2が、外径円筒部用のキャビティ２３内に充填され、樹脂プーリ１２が成形される。
【００２８】
このように、各ゲート孔２５から注入された溶融樹脂Ｒは、まず、内径円筒部用のキャビティ２２内のゲート孔２５の反対側端面Ｓに流入するため、短時間で反対側端面Ｓ部分に溶融樹脂が充填され、空洞やウェルド部の接合強度が低下するのを抑制できる。
（実施の形態２）
本発明の実施の形態２について、図３を用いて説明する。
【００２９】
図２は、転がり軸受１１の外周に樹脂プーリ３１を一体成形してなる樹脂プーリ付き軸受３０の断面図を示している。転がり軸受１１は、実施の形態１と同様であり、内輪１３、外輪１４、玉やころの転動体１５等にて構成されている。また、樹脂プーリ３１は、転がり軸受１１の外輪１４に固着した内径円筒部３２と、ベルト案内面３４を有する外径円筒部３３と、内径円筒部３２と外径円筒部３３の間に設けた円板部３５と、円板部３５の両面に所定間隔置きに放射状に形成した複数の補強リブ３６とから構成されている。
【００３０】
内径円筒部３２の軸受径方向の厚みＣは、円板部３５の軸受軸方向の厚みＤより大きく形成されている。厚みＣと厚みＤの関係は、Ｃ＞Ｄであればよく、好ましくは、０．７×Ｃ≦Ｄ≦０．９５×Ｃとする。ただし、樹脂プーリ３１の円板部３５は補強リブ３６によって補強されているため、強度上の問題が生じない範囲において、円板部３５の軸受軸方向の厚みＤを薄くし、Ｄ＜０．７×Ｃとなるようにしてもよい。
【００３１】
なお、樹脂プーリ３１は、図２と同様に、補強リブ用のキャビティを備えた成形金型を用いて射出成形する。
【００３２】
このように、補強リブ３６を有した樹脂プーリ３１においても、実施の形態１と同様、ゲート孔から注入された溶融樹脂は、まず、内径円筒部用のキャビティ内のゲート孔の反対側端面Ｓに流入するため、短時間で反対側端面Ｓ部分に溶融樹脂が充填され、空洞やウェルド部の接合強度が低下するのを抑制できる。
【００３３】
【発明の効果】
本発明の樹脂プーリ付き軸受およびその製造方法によれば、樹脂プーリの内径円筒部におけるゲート孔の反対側端面に空洞やウェルド部の接合強度が低下するのを抑制し、樹脂プーリの破損を防止することができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施の形態１における樹脂プーリ付き軸受の部分断面図である。
【図２】本発明の実施の形態１における樹脂プーリの成形工程の断面図である。
【図３】本発明の実施の形態２における樹脂プーリ付き軸受の部分断面図である。
【図４】従来の樹脂プーリ付き軸受の正面図である。
【図５】図４のＶ-Ｖ断面図である。
【図６】従来の樹脂プーリの成形工程の断面図である。
【符号の説明】
１０，３０ 樹脂プーリ付き軸受
１１ 転がり軸受
１２，３１ 樹脂プーリ
１３ 内輪
１４ 外輪
１５ 転動体
１６，３２ 内径円筒部
１７，３３ 外径円筒部
１８，３４ ベルト案内面
１９，３５ 円板部
３６ 補強リブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing with a resin pulley that is suitable for an idler bearing, a tensioner bearing, and the like that are used for adjusting belt tension and changing a traveling path in an automobile timing belt, an auxiliary machine driving belt, and the like.
[0002]
[Prior art]
Conventionally, in order to reduce the weight and reduce the cost of bearings used in auxiliary machinery driving belts for transmitting engine rotational power to automobile auxiliary machinery, the outer peripheral surface of the metal outer ring of the rolling bearing is used. In addition, a bearing with a resin pulley formed by integrally molding a pulley made of synthetic resin is used.
[0003]
An example of a conventional bearing 40 with a resin pulley will be described with reference to FIGS. A bearing 40 with a resin pulley is formed by integrally molding a resin pulley 42 on the outer periphery of a rolling bearing 41. The rolling bearing 41 includes an inner ring 43, an outer ring 44, ball and roller rolling elements 45, and the like. The resin pulley 42 is provided between the inner diameter cylindrical portion 46 fixed to the outer ring 44 of the rolling bearing 41, the outer diameter cylindrical portion 47 having the belt guide surface 48, and the inner diameter cylindrical portion 46 and the outer diameter cylindrical portion 47. It is comprised from the disc part 49. FIG.
[0004]
The resin pulley 42 is manufactured by synthetic resin injection molding. That is, as shown in FIG. 6, the rolling bearing 41 is centered and fixed between the upper die 50 and the lower die 51, and the cavity around the upper die 50, the lower die 51, and the slide die 57 is filled with molten resin.
[0005]
Here, 52 is a cavity for the inner diameter cylindrical portion 46, 53 is a cavity for the outer diameter cylindrical portion 47, and 54 is a cavity for the disc portion 49. A gate hole 55 connected to the runner 56 is opened on one end face of the cavity 52 for the inner diameter cylindrical portion.
[0006]
When molding the resin pulley 42, the molten resin is filled from the gate hole 55 through the runner 56 with the rolling bearing 41 set in the molding die. The molten resin filled in each of the cavities 52, 53, 54 is solidified and the mold is opened to form the resin pulley 42.
[0007]
[Problems to be solved by the invention]
At the time of injection molding of the resin pulley 42, the molten resin r injected from each gate hole 55 flows in the axial direction of the bearing through the cavity 52 for the inner diameter cylindrical portion. When the molten resin r flowing in the inner diameter cylindrical cavity 52 reaches the disk portion cavity 54, it flows into the disk portion cavity 54. This is because the thickness F of the disc portion 49 in the bearing axial direction is larger than the thickness E of the inner diameter cylindrical portion 46 in the bearing radial direction, and the molten resin r advances into the cavity 54 for the thick disc portion with less resistance. This is to try. However, not all of the molten resin r flows into the disk portion cavity 54, but a part of the molten resin r advances toward the opposite end surface S of the gate hole 55 in the inner diameter cylindrical portion cavity 52.
[0008]
The molten resin r 1 flowing into the disk portion cavity 54 flows into the outer diameter cylindrical portion cavity 53. When the cavity 53 for the outer diameter cylindrical portion is completely filled with the molten resin r 1 , the opposite end face S of the gate hole 55 of the cavity 52 for the inner diameter cylindrical portion is also filled with the molten resin r 2 .
[0009]
As described above, the end surface S opposite to the gate hole 55 of the cavity 52 for the inner diameter cylindrical portion is filled with the molten resin r 1 in the cavity 53 for the outer diameter cylindrical portion, and then filled with the molten resin r 2. Therefore, it takes time to fill the molten resin r 2 on the opposite end surface S. Therefore, after the opposite end surface molten resin r 2 which has flown into the S is cured, the molten resin r 1 in the cavity 53 for the outer diameter cylinder is completely filled before the molten resin r 2 are completely filled The molten resin r 2 cannot flow into the opposite side end surface S, and a cavity is formed in the opposite side end surface S, or the weld strength of the weld portion generated at the junction of the molten resin r 2 that has flowed in first decreases. There was something to do.
[0010]
When the cavity is generated, the strength is remarkably lowered at the opposite end face S portion of the resin pulley 42. Further, since the opposite end surface S is located in the vicinity of the outer ring 44 of the rolling bearing 41, if the weld strength of the weld portion decreases, the difference in linear expansion coefficient between the resin pulley 42 and the metal outer ring 44 during use. Thus, a crack is generated in the resin pulley 42 starting from the weld portion. As a result, there is a problem that the resin pulley 42 is damaged.
[0011]
The present invention suppresses a decrease in bonding strength of a cavity or a weld portion on an end surface opposite to a gate hole in an inner diameter cylindrical portion of a resin pulley, and prevents the resin pulley from being damaged and its manufacture It aims to provide a method.
[0012]
[Means for Solving the Problems]
Claim 1 of the present invention is a bearing with a resin pulley in which a resin pulley is integrally formed on an outer peripheral surface of an outer ring of a rolling bearing, wherein the resin pulley has a resin injection gate hole disposed on one end surface thereof, and An inner diameter cylindrical portion fixed to the outer ring of the rolling bearing, an outer diameter cylindrical portion having a belt guide surface, and a disk portion provided between the inner and outer diameter cylindrical portions, the bearing diameter direction of the inner diameter cylindrical portion The thickness is larger than the thickness of the disk portion in the bearing axial direction.
[0013]
A preferable relationship between the thickness A in the bearing radial direction of the inner cylindrical portion and the thickness B in the bearing axial direction of the disc portion is 0.7 × A ≦ B ≦ 0.95 × A.
[0014]
According to the bearing with the resin pulley of the first aspect of the present invention, the thickness of the inner diameter cylindrical portion of the resin pulley in the bearing radial direction is made larger than the thickness of the disk portion in the bearing axial direction. The molten resin injected from the gate hole flows into the opposite end face of the gate hole and fills, and then flows into the outer diameter cylindrical part through the disk part. Therefore, the molten resin is applied to the opposite end face of the gate hole in the inner diameter cylindrical part. Can be quickly filled, and the bonding strength of the cavity and the weld can be prevented from being lowered.
[0015]
Claim 2 of the present invention is a bearing with a resin pulley in which a resin pulley is integrally formed on the outer peripheral surface of an outer ring of a rolling bearing, wherein a resin injection gate hole is disposed on one end surface, and the resin pulley is An inner diameter cylindrical portion fixed to the outer ring of the rolling bearing, an outer diameter cylindrical portion having a belt guide surface, a disk portion provided between the inner and outer diameter cylindrical portions, and a plurality of reinforcements formed radially on the disk portion. The thickness of the cylindrical part of the inner diameter in the bearing radial direction is larger than the thickness of the disk part in the bearing axial direction.
[0016]
A preferable relationship between the thickness A in the bearing radial direction of the inner cylindrical portion and the thickness B in the bearing axial direction of the disc portion is 0.7 × A ≦ B ≦ 0.95 × A.
[0017]
According to the bearing with the resin pulley of claim 2 of the present invention, the thickness of the inner diameter cylindrical portion of the resin pulley in the bearing radial direction is made larger than the thickness of the disk portion in the bearing axial direction. The molten resin injected from the gate hole flows into the opposite end face of the gate hole and fills, and then flows into the outer diameter cylindrical part through the disk part. Therefore, the molten resin is applied to the opposite end face of the gate hole in the inner diameter cylindrical part. Can be quickly filled, and the bonding strength of the cavity and the weld can be prevented from being lowered. In addition, a plurality of reinforcing ribs formed radially on the disk portion even if the thickness of the disk portion is reduced so that the thickness of the inner diameter cylindrical portion in the bearing radial direction is larger than the thickness of the disk portion in the bearing axial direction. Can be reinforced by.
[0018]
According to a fourth aspect of the present invention, there is provided a method of manufacturing a bearing with a resin pulley in which a resin pulley is integrally formed on the outer peripheral surface of an outer ring of a rolling bearing, wherein the inner diameter cylindrical portion has a resin injection gate hole on one end surface. A cavity for the outer diameter cylindrical portion, and a cavity for the disk portion provided between the cavities of the inner and outer diameter cylindrical portions, and the thickness of the cavity for the inner diameter cylindrical portion in the bearing radial direction is into the molding die is made larger than the bearing axis of the thickness of the cavity of the plate part, a mold clamping step of clamping by placing the rolling bearing, the molten resin from the gate hole is injected into the cavity, the inner diameter after filling in the opposite end face and the gate hole of the cavity for the circular tube portion, the method comprising an injection step of filling the cavity for the cavity for the disc portion the outer cylindrical portion.
[0019]
According to the method for manufacturing a bearing with a resin pulley according to claim 4 of the present invention, the thickness in the bearing radial direction of the cavity for the inner diameter cylindrical portion of the molding die is made larger than the thickness in the bearing axial direction of the cavity for the disk portion. Thus, after the molten resin injected from the gate hole on one end face of the cavity for the inner diameter cylindrical part flows into the opposite end face of the gate hole and is filled, the resin for the outer diameter cylinder part passes through the cavity for the disk part. Since it flows into the cavity, molten resin is quickly filled into the opposite end face of the gate hole in the inner diameter cylindrical portion of the resin pulley, and it is possible to suppress a decrease in the bonding strength of the cavity and the weld portion.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG.
[0021]
FIG. 1 shows a partial cross-sectional view of a bearing 10 with a resin pulley formed by integrally molding a resin pulley 12 on the outer periphery of a rolling bearing 11. The rolling bearing 11 includes an inner ring 13, an outer ring 14, ball and roller rolling elements 15, and the like. The resin pulley 12 is provided between the inner diameter cylindrical portion 16 fixed to the outer ring 14 of the rolling bearing 11, the outer diameter cylindrical portion 17 having the belt guide surface 18, and the inner diameter cylindrical portion 16 and the outer diameter cylindrical portion 17. It is comprised from the disc part 19. FIG.
[0022]
A thickness A in the bearing radial direction of the inner cylindrical portion 16 is formed larger than a thickness B in the bearing axial direction of the disc portion 19. The relationship between the thickness A and the thickness B may be A> B, but preferably 0.7 × A ≦ B ≦ 0.95 × A.
[0023]
Next, molding of the resin pulley 12 will be described with reference to FIG.
[0024]
In FIG. 2, the molding die includes an upper die 20, a lower die 21, and a slide die 27, 22 is a cavity for the inner diameter cylindrical portion 16, 23 is a cavity for the outer diameter cylindrical portion 17, and 24 is a disk portion 19. Cavity for use. Further, a gate hole 25 connected to the runner 26 is opened on one end face of the cavity 22 for the inner diameter cylindrical portion.
[0025]
When molding the resin pulley 12, the molten resin is filled from the gate hole 25 through the runner 26 with the rolling bearing 11 set in a molding die. The molten resin filled in the cavities 22, 23, 24 is solidified and the mold is opened to form the resin pulley 12.
[0026]
At the time of injection molding of the resin pulley 12, the molten resin R injected from each gate hole 25 flows in the axial direction of the bearing through the cavity 22 for the inner diameter cylindrical portion. When the molten resin R flowing in the inner cylindrical portion cavity 22 reaches the disk portion cavity 24 portion, the molten resin R flows into the inner cylindrical portion cavity 22 toward the opposite end surface S of the gate hole 25 as it is. This is because the thickness A in the bearing radial direction of the inner diameter cylindrical portion 16 is larger than the thickness B in the bearing axial direction of the disc portion 19 and the molten resin R advances into the cavity 22 for the thick inner diameter cylindrical portion with less resistance. This is to try. However, not all of the molten resin R travels in the cavity 22 for the inner diameter cylindrical portion toward the opposite end surface S, but a part flows into the cavity 24 for the disk portion.
[0027]
When the opposite end face S of the gate hole 25 in the cavity 22 for the inner diameter cylindrical portion is completely filled with the molten resin R 1, the molten resin R 2 that has flowed into the cavity 24 for the disk portion becomes the outer diameter cylinder. The resin pulley 12 is molded by filling the cavity 23 for part.
[0028]
As described above, the molten resin R injected from each gate hole 25 first flows into the opposite end surface S of the gate hole 25 in the cavity 22 for the inner diameter cylindrical portion, so that the molten resin R enters the opposite end surface S portion in a short time. It can suppress that the molten resin is filled and the joint strength of a cavity and a weld part falls.
(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG.
[0029]
FIG. 2 is a sectional view of a bearing 30 with a resin pulley formed by integrally molding a resin pulley 31 on the outer periphery of the rolling bearing 11. The rolling bearing 11 is the same as that of the first embodiment, and includes an inner ring 13, an outer ring 14, rolling elements 15 such as balls and rollers, and the like. The resin pulley 31 is provided between the inner diameter cylindrical portion 32 fixed to the outer ring 14 of the rolling bearing 11, the outer diameter cylindrical portion 33 having the belt guide surface 34, and the inner diameter cylindrical portion 32 and the outer diameter cylindrical portion 33. The disc portion 35 includes a plurality of reinforcing ribs 36 that are radially formed on both surfaces of the disc portion 35 at predetermined intervals.
[0030]
A thickness C in the bearing radial direction of the inner cylindrical portion 32 is formed to be larger than a thickness D in the bearing axial direction of the disc portion 35. The relationship between the thickness C and the thickness D may be C> D, and preferably 0.7 × C ≦ D ≦ 0.95 × C. However, since the disc portion 35 of the resin pulley 31 is reinforced by the reinforcing ribs 36, the thickness D in the bearing axial direction of the disc portion 35 is reduced and D <0. It may be set to 7 × C.
[0031]
The resin pulley 31 is injection-molded using a molding die provided with a cavity for reinforcing ribs, as in FIG.
[0032]
As described above, in the resin pulley 31 having the reinforcing ribs 36 as well, the molten resin injected from the gate hole is first subjected to the end surface S on the opposite side of the gate hole in the cavity for the inner diameter cylindrical portion. Therefore, it is possible to suppress a decrease in the bonding strength of the cavity and the weld portion by filling the opposite end surface S portion with the molten resin in a short time.
[0033]
【The invention's effect】
According to the bearing with a resin pulley of the present invention and the method of manufacturing the same, it is possible to suppress a decrease in the bonding strength of the cavity and the weld portion on the opposite end surface of the gate hole in the inner diameter cylindrical portion of the resin pulley, thereby preventing the resin pulley from being damaged. The effect that it can do is acquired.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a bearing with a resin pulley according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a resin pulley molding process according to Embodiment 1 of the present invention.
FIG. 3 is a partial sectional view of a bearing with a resin pulley according to a second embodiment of the present invention.
FIG. 4 is a front view of a conventional bearing with a resin pulley.
FIG. 5 is a cross-sectional view taken along the line VV of FIG.
FIG. 6 is a cross-sectional view of a conventional resin pulley molding process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 30 Bearing with resin pulley 11 Rolling bearing 12, 31 Resin pulley 13 Inner ring 14 Outer ring 15 Rolling element 16, 32 Inner diameter cylindrical part 17, 33 Outer diameter cylindrical part 18, 34 Belt guide surface 19, 35 Disc part 36 Reinforcement rib

Claims (4)

転がり軸受の外輪の外周面に樹脂製のプーリを一体成形した樹脂プーリ付き軸受であって、
前記樹脂プーリは、片端面に樹脂注入用ゲート孔が配置され、かつ前記転がり軸受の外輪に固着する内径円筒部と、ベルト案内面を有する外径円筒部と、内外径円筒部間に設けられた円板部とを有し、
前記内径円筒部の軸受径方向の厚みを、前記円板部の軸受軸方向の厚みより大きくしたことを特徴とする樹脂プーリ付き軸受。A bearing with a resin pulley in which a resin pulley is integrally formed on the outer peripheral surface of an outer ring of a rolling bearing,
The resin pulley has a resin injection gate hole disposed on one end surface thereof, and is provided between an inner diameter cylindrical portion fixed to an outer ring of the rolling bearing, an outer diameter cylindrical portion having a belt guide surface, and an inner and outer diameter cylindrical portion. A disc part,
A bearing with a resin pulley, wherein a thickness of the inner cylindrical portion in a bearing radial direction is larger than a thickness of the disk portion in a bearing axial direction. 転がり軸受の外輪の外周面に樹脂製のプーリを一体成形した樹脂プーリ付き軸受であって、
前記樹脂プーリは、片端面に樹脂注入用ゲート孔が配置され、かつ前記転がり軸受の外輪に固着する内径円筒部と、ベルト案内面を有する外径円筒部と、内外径円筒部間に設けられた円板部およびその円板部に放射状に形成された複数の補強リブとを有し、
前記内径円筒部の軸受径方向の厚みを、前記円板部の軸受軸方向の厚みより大きくしたことを特徴とする樹脂プーリ付き軸受。A bearing with a resin pulley in which a resin pulley is integrally formed on the outer peripheral surface of an outer ring of a rolling bearing,
The resin pulley has a resin injection gate hole disposed on one end surface thereof, and is provided between an inner diameter cylindrical portion fixed to an outer ring of the rolling bearing, an outer diameter cylindrical portion having a belt guide surface, and an inner and outer diameter cylindrical portion. A plurality of reinforcing ribs formed radially on the disk part and the disk part,
A bearing with a resin pulley, wherein a thickness of the inner cylindrical portion in a bearing radial direction is larger than a thickness of the disk portion in a bearing axial direction. 内径円筒部の軸受径方向の厚みＡと、円板部の軸受軸方向の厚みＢとの関係を、０．７×Ａ≦Ｂ≦０．９５×Ａとした請求項１または請求項２記載の樹脂プーリ付き軸受。  The relation between the thickness A in the bearing radial direction of the inner diameter cylindrical portion and the thickness B in the bearing axial direction of the disc portion is 0.7 × A ≦ B ≦ 0.95 × A. Bearing with resin pulley. 転がり軸受の外輪の外周面に樹脂製のプーリを一体成形する樹脂プーリ付き軸受の製造方法であって、
片端面に樹脂注入用ゲート孔を有した内径円筒部用のキャビティと、外径円筒部用のキャビティと、内外径円筒部のキャビティ間に設けられた円板部用のキャビティとからなり、前記内径円筒部用のキャビティの軸受径方向の厚みを前記円板部用のキャビティの軸受軸方向の厚みより大きくした成形金型内に、転がり軸受を配置して型締めする型締工程と、
前記ゲート孔から溶融樹脂をキャビティ内に射出し、前記内径円筒部用のキャビティの前記ゲート孔とは反対側端面に充填した後、前記円板部用のキャビティと前記外径円筒部用のキャビティとを充填する射出工程とを含む樹脂プーリ付き軸受の製造方法。A method of manufacturing a bearing with a resin pulley, in which a resin pulley is integrally formed on an outer peripheral surface of an outer ring of a rolling bearing,
A cavity for an inner diameter cylindrical portion having a resin injection gate hole on one end surface, a cavity for an outer diameter cylindrical portion, and a cavity for a disk portion provided between the cavities of the inner and outer diameter cylindrical portions, A mold clamping step in which a rolling bearing is disposed and clamped in a molding die in which the thickness in the bearing radial direction of the cavity for the inner diameter cylindrical portion is larger than the thickness in the bearing axial direction of the cavity for the disk portion;
The molten resin from the gate hole is injected into the cavity, after filling the end surface opposite from said gate hole of the cavity for the inner cylindrical portion, the outer-diameter cylindrical portion and the cavity for the disc portion The manufacturing method of the bearing with a resin pulley including the injection | emission process which fills the cavity for an object.
JP2001063113A 2001-03-07 2001-03-07 Bearing with resin pulley and manufacturing method thereof Expired - Fee Related JP4269530B2 (en)

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