JP3506735B2 - Synthetic resin pulley - Google Patents
Synthetic resin pulleyInfo
- Publication number
- JP3506735B2 JP3506735B2 JP21021393A JP21021393A JP3506735B2 JP 3506735 B2 JP3506735 B2 JP 3506735B2 JP 21021393 A JP21021393 A JP 21021393A JP 21021393 A JP21021393 A JP 21021393A JP 3506735 B2 JP3506735 B2 JP 3506735B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- cavity
- cylindrical portion
- rolling bearing
- pulley
- 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.)
- Expired - Fee Related
Links
Landscapes
- Pulleys (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、内径側に転がり軸受
を一体に設けた合成樹脂製プーリに関するものである。
【０００２】
【従来の技術】オルタネータ等の自動車の補機を駆動す
るベルトの案内用プーリには転がり軸受付きの合成樹脂
製プーリが一般に使用されている。
【０００３】この種の合成樹脂製プーリとして、図５お
よび図６に示したものが従来から知られている。この合
成樹脂製プーリは、転がり軸受２０と、その周りに一体
成形された合成樹脂部本体２１とから成り、合成樹脂部
本体２１は、転がり軸受２０の外輪に固着された内径円
筒部２２と、ベルト案内面を有する外径円筒部２３と、
内外円筒部２２、２３間に設けられた円板部２４および
その円板部２４に形成された放射状の複数のリブ２５と
を有している。
【０００４】合成樹脂部本体２１は、ガラス繊維等の強
化繊維を１５乃至４０数％充填した強化ナイロン６６、
６１０、６１２、あるいはポリフェニレンサルファイド
（ＰＰＳ）とミネラルの複合材料等の材料で形成されて
いる。
【０００５】上記合成樹脂製プーリは、リブ２５間の各
間隔内の円板部２４上にそれぞれゲート２６が、リブ２
５と同数形成されている。ゲート２６は、内外円筒部２
２、２３の中間位置で、隣接するリブ２５間の２等分位
置を通る放射線上に設けられている。したがって、各リ
ブ２５に注目すると、リブ２５の両側の２つのゲート２
６は、リブ２５に対して対称位置に配置されている。
【０００６】製造においては、図６に示すような下型２
７と上型２８とから成る金型が使用される。転がり軸受
２０は、下型２７と上型２８との間に形成されたキャビ
ティの中央部にセットされ、その転がり軸受２０をイン
サート部品としてその周りのキャビティに溶融樹脂が圧
入充填される。
【０００７】図６における２９は内径円筒部２２用のキ
ャビティ、３０は外径円筒部２３用のキャビティ、３１
は円板部２４用のキャビティ、３２はリブ２５用のキャ
ビティを示し、円板部用キャビティ３１にはランナー３
３の先端に形成されたゲート３４が開口している。
【０００８】
【発明が解決しようとする課題】ところで、従来の合成
樹脂製プーリにおいては、円板部２４上にゲート３４が
配置されているため、円板部２４から内径円筒部用キャ
ビティ２９および外径円筒部用キャビティ３０に流入し
た溶融樹脂は、低温化してから合流することになる。
【０００９】このため、内径円筒部用キャビティ２９お
よび外径円筒部用キャビティ３０における溶融樹脂のヒ
ケ量は、他のキャビティにおける溶融樹脂のヒケ量より
少なく、成形後、表面に凸部が生じ、その凸部により、
内外円筒部２２、２３の真円度が低下するという不都合
がある。
【００１０】この発明は上記の不都合を解消し、合成樹
脂製のプーリの内外円筒部の精度を向上させると共に、
プーリ全体の強度を向上させることを技術的課題として
いる。
【００１１】
【課題を解決するための手段】上記の課題を解決するた
めに、この発明においては、転がり軸受と、その周りに
一体成形された合成樹脂部本体とから成り、合成樹脂部
本体は、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
数のリブとを有する合成樹脂製プーリにおいて、前記内
外円筒部の隣接するリブの内端部間および外端部間と対
向する位置にゲートを交互に配置した構成としている。
【００１２】
【作用】上記の構成において、内外両円筒部の各ゲート
から圧入充填された溶融樹脂は、内外両円筒部に流入
し、その両円筒部を周方向に流れて合流すると共に、各
ゲート間にあるリブ用キャビティの内径端と外径端から
外方向および内方向に流れて合流する。そのため、内外
両円筒部には余り低温化しない溶融樹脂が流入すること
になり、凸部の発生が抑えられると共に、転がり軸受へ
の熱影響を極力抑えることができる。
【００１３】
【実施例】以下、この発明の実施例を添付図面の図１乃
至図４に基づいて説明する。
【００１４】図１および図２に示すように、合成樹脂製
プーリは、転がり軸受１と、その周囲に成形された合成
樹脂部本体２とからなる。合成樹脂部本体２は、転がり
軸受１の外輪１ａに固着する内径円筒部３と、ベルト案
内面を有する外径円筒部４と、内外両円筒部３、４間に
設けられた円板部５およびその円板部５の両面に放射状
に設けられた複数のリブ６とを有する。
【００１５】合成樹脂部本体２の材質は、前述従来の合
成樹脂部本体と同様であるため、説明を省略する。
【００１６】内径円筒部３には複数のゲート７が、リブ
６の２倍の夾角αに相当する間隔をおいて周方向に等間
隔に形成されている。
【００１７】また、外径円筒部４には複数のゲート８が
リブ６の２倍の夾角αに相当する間隔をおいて周方向に
等間隔に形成されている。これらのゲート７、８は、隣
接するリブ６の２等分位置を通る放射線上に配置され、
内径円筒部３のゲート７と外径円筒部４のゲート８とは
周方向に半ピッチ位置がずれ、周方向に千鳥状に配置さ
れている。
【００１８】ここで、内径円筒部３のゲート７は、内径
円筒部３の外径寄りに、一方、外径円筒部４のゲート８
は外径円筒部４の内径寄りに配置する方が溶融樹脂の流
れの関係で好ましい。
【００１９】図３および図４は、合成樹脂製プーリの成
形用金型を示す。金型は、下型９と上型１０とから成
る。転がり軸受１は、下型９と上型１０との間のキャビ
ティ中央部にセットされ、その転がり軸受１をインサー
ト部品としてその周りのキャビティに溶融樹脂が圧入充
填される。
【００２０】ここで、１１は内径円筒部３用のキャビテ
ィ、１２は外径円筒部４用のキャビティ、１３は円板部
５用のキャビティ、１４はリブ６用のキャビティをそれ
ぞれ示し、内径円筒部用キャビティ１１にゲート孔１
５、外径円筒部用のキャビティ１２にゲート孔１６が開
口している。１７はランナーを示す。
【００２１】転がり軸受１のセット状態において、ゲー
ト孔１５、１６のそれぞれに溶融樹脂を圧入充填する
と、ゲート孔１５からの溶融樹脂は、内径円筒部用キャ
ビティ１１内を流れて円板部用キャビティ１３およびリ
ブ用キャビティ１４にも広がる。一方、ゲート孔１６か
らの溶融樹脂は、外径円筒部用キャビティ１２内を流れ
て円板部用キャビティ１３およびリブ用キャビティ１４
に広がり、円板部用キャビティ１３およびリブ用キャビ
ティ１４内においてゲート孔１５からの溶融樹脂と合流
し、各キャビティを充填する。
【００２２】このように、別々のゲート孔１５、１６か
ら流入した溶融樹脂は、各ゲート孔１５、１６間に位置
するリブ用キャビティ１４内と、内径円筒部用キャビテ
ィ１１内および外径円筒部用キャビティ１２内でそれぞ
れで合流するため、あまり低温化しない状態で合流する
ことになり、充分に混合した状態となる。このため、内
外両円筒部３、４、円板部５およびリブ６にはウェルド
が生じず、合成樹脂製プーリの各部強度が均一化すると
共に、転がり軸受１には熱影響がなく、内外円筒部３、
４の精度が安定向上する。
【００２３】
【発明の効果】以上のように、この発明に係る合成樹脂
製プーリにおいては、内外円筒部の隣接するリブの内端
部間および外端部間と対向する位置にゲートを交互に形
成したので、ゲートから圧入充填された溶融樹脂は内外
円筒部用キャビティにスムーズに広がって低温化しない
状態で合流することになり、その結果、内外円筒部の精
度が向上すると共に、合成樹脂製プーリの各部強度が均
一化し、また、転がり軸受には熱影響がなく、軸受機能
が阻害されることがないという効果を奏する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pulley integrally provided with a rolling bearing on the inner diameter side. 2. Description of the Related Art A pulley made of a synthetic resin with a rolling bearing is generally used as a pulley for guiding a belt for driving an auxiliary machine of an automobile such as an alternator. FIGS. 5 and 6 show a conventional synthetic resin pulley of this type. The synthetic resin pulley includes a rolling bearing 20 and a synthetic resin portion main body 21 integrally formed therearound. The synthetic resin portion main body 21 includes An outer cylindrical portion 23 having a belt guide surface,
It has a disk portion 24 provided between the inner and outer cylindrical portions 22 and 23 and a plurality of radial ribs 25 formed on the disk portion 24. The synthetic resin portion main body 21 is made of a reinforced nylon 66 filled with fifteen to forty percent of reinforcing fibers such as glass fibers.
610, 612 or a material such as a composite material of polyphenylene sulfide (PPS) and mineral. [0005] In the above-mentioned synthetic resin pulley, a gate 26 is provided on the disk portion 24 within each interval between the ribs 25, and the ribs 2 are provided.
5 and the same number. The gate 26 includes the inner and outer cylindrical portions 2.
It is provided on the radiation passing through the bisecting position between the adjacent ribs 25 at an intermediate position between 2 and 23. Therefore, focusing on each rib 25, the two gates 2 on both sides of the rib 25
6 is arranged at a symmetrical position with respect to the rib 25. In manufacturing, a lower mold 2 as shown in FIG.
A mold composed of 7 and an upper mold 28 is used. The rolling bearing 20 is set at the center of a cavity formed between the lower die 27 and the upper die 28, and the rolling bearing 20 is used as an insert component to press-fit a molten resin into the surrounding cavity. In FIG. 6, reference numeral 29 denotes a cavity for the inner cylindrical portion 22; 30 denotes a cavity for the outer cylindrical portion 23;
Indicates a cavity for the disk portion 24, 32 indicates a cavity for the rib 25, and a runner 3 is provided in the disk portion cavity 31.
The gate 34 formed at the tip of the third port 3 is open. In the conventional pulley made of synthetic resin, since the gate 34 is disposed on the disk portion 24, the cavity 29 for the inner diameter cylindrical portion and the cavity 29 are formed from the disk portion 24. The molten resin that has flowed into the outer diameter cylindrical portion cavity 30 joins after the temperature is lowered. For this reason, the amount of sink of the molten resin in the cavity 29 for the inner diameter cylindrical portion and the cavity 30 for the outer diameter cylindrical portion is smaller than the amount of sink of the molten resin in the other cavities. By the convex part,
There is a disadvantage that the roundness of the inner and outer cylindrical portions 22 and 23 is reduced. The present invention solves the above disadvantages, improves the accuracy of the inner and outer cylindrical portions of the pulley made of synthetic resin, and
It is a technical task to improve the strength of the entire pulley. [0011] In order to solve the above-mentioned problems, the present invention comprises a rolling bearing and a synthetic resin portion main body integrally formed therearound. 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 cylindrical portions, and a plurality of ribs radially formed on the disk portion. The gates are alternately arranged at positions opposing the inner ends and the outer ends of adjacent ribs of the inner and outer cylindrical portions. In the above arrangement, the molten resin press-fitted from the gates of the inner and outer cylindrical portions flows into the inner and outer cylindrical portions, flows in the two cylindrical portions in the circumferential direction, and joins. It flows outward and inward from the inner and outer diameter ends of the rib cavity between the gates and merges. Therefore, the molten resin that does not become low in temperature flows into the inner and outer cylindrical portions, so that the occurrence of the convex portions is suppressed, and the thermal influence on the rolling bearing can be suppressed as much as possible. An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings. As shown in FIGS. 1 and 2, the synthetic resin pulley includes a rolling bearing 1 and a synthetic resin portion main body 2 formed around the rolling bearing. The synthetic resin portion main body 2 includes an inner cylindrical portion 3 fixed to the outer ring 1a of the rolling bearing 1, an outer cylindrical portion 4 having a belt guide surface, and a disk portion 5 provided between the inner and outer cylindrical portions 3, 4. And a plurality of ribs 6 radially provided on both surfaces of the disk portion 5. The material of the synthetic resin portion main body 2 is the same as that of the above-mentioned conventional synthetic resin portion main body, and the description is omitted. A plurality of gates 7 are formed in the inner cylindrical portion 3 at equal intervals in the circumferential direction at an interval corresponding to twice the included angle α of the rib 6. A plurality of gates 8 are formed on the outer diameter cylindrical portion 4 at equal intervals in the circumferential direction at intervals corresponding to twice the included angle α of the ribs 6. These gates 7, 8 are arranged on a ray passing through the bisected position of the adjacent rib 6,
The gate 7 of the inner diameter cylindrical portion 3 and the gate 8 of the outer diameter cylindrical portion 4 are shifted from each other by a half pitch in the circumferential direction, and are arranged in a staggered manner in the circumferential direction. Here, the gate 7 of the inner diameter cylindrical portion 3 is located near the outer diameter of the inner diameter cylindrical portion 3, while the gate 8 of the outer diameter cylindrical portion 4 is connected to the gate 8.
It is more preferable to dispose it closer to the inner diameter of the outer cylindrical portion 4 in view of the flow of the molten resin. FIGS. 3 and 4 show a mold for molding a synthetic resin pulley. The mold includes a lower mold 9 and an upper mold 10. The rolling bearing 1 is set at the center of the cavity between the lower mold 9 and the upper mold 10, and the rolling resin 1 is used as an insert component to press-fill the surrounding cavity with molten resin. Here, reference numeral 11 denotes a cavity for the inner cylindrical portion 3, 12 denotes a cavity for the outer cylindrical portion 4, 13 denotes a cavity for the disk portion 5, and 14 denotes a cavity for the rib 6, respectively. Gate hole 1 in the part cavity 11
5. A gate hole 16 is opened in the cavity 12 for the outer diameter cylindrical portion. Reference numeral 17 denotes a runner. When the molten resin is press-fitted into each of the gate holes 15 and 16 in the set state of the rolling bearing 1, the molten resin from the gate hole 15 flows through the cavity 11 for the inner diameter cylindrical portion, and flows into the cavity 11 for the disk portion. 13 and the rib cavity 14. On the other hand, the molten resin from the gate hole 16 flows in the cavity 12 for the outer diameter cylindrical portion, and flows into the disk portion cavity 13 and the rib cavity 14.
And merges with the molten resin from the gate hole 15 in the disk portion cavity 13 and the rib cavity 14 to fill each cavity. As described above, the molten resin flowing from the separate gate holes 15 and 16 is supplied to the inside of the rib cavity 14 located between the gate holes 15 and 16 and the inside of the cavity 11 for the inner diameter cylindrical portion and the outer diameter cylindrical portion. Since they merge together in the cavity 12, they merge in a state where the temperature is not so low, and a sufficiently mixed state is obtained. For this reason, no weld is generated in the inner and outer cylindrical portions 3 and 4, the disk portion 5 and the rib 6, the strength of each portion of the synthetic resin pulley is made uniform, and the rolling bearing 1 is not affected by heat. Part 3,
4 stably improves the accuracy. As described above, in the synthetic resin pulley according to the present invention, the gates are alternately arranged at positions opposing the inner ends and the outer ends of adjacent ribs of the inner and outer cylindrical portions. As a result, the molten resin press-fitted from the gate spreads smoothly into the inner and outer cylindrical part cavities and joins without lowering the temperature.As a result, the accuracy of the inner and outer cylindrical parts is improved, and the synthetic resin The strength of each part of the pulley is made uniform, and there is an effect that the rolling bearing is not affected by heat and the bearing function is not hindered.
【図面の簡単な説明】
【図１】この発明に係る合成樹脂製プーリの一実施例を
示す正面図
【図２】同上の縦断側面図
【図３】図１のIII −III 線断面における成形金型の断
面図
【図４】図１のIV−IV線断面における成形金型の断面図
【図５】従来の合成樹脂製プーリを示す一部省略の正面
図
【図６】図５のVI−VI線断面における成形金型の断面図
【符号の説明】
１ 転がり軸受
２ 合成樹脂部本体
３ 内径円筒部
４ 外径円筒部
５ 円板部
６ リブ
７、８ ゲートBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of a synthetic resin pulley according to the present invention. FIG. 2 is a longitudinal side view of the same. FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a cross-sectional view of a molding die taken along a line IV-IV in FIG. 1. FIG. 5 is a partially omitted front view showing a conventional synthetic resin pulley. FIG. 6 is a VI of FIG. Cross-sectional view of the molding die in the section taken along the line VI.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−34260（ＪＰ，Ａ) 特開 平１−229168（ＪＰ，Ａ) 実開 平２−94962（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16H 55/32 - 55/56 B29C 45/00 - 45/84 B29D 31/00 B29L 31:32 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-34260 (JP, A) JP-A-1-229168 (JP, A) JP-A-2-94962 (JP, U) (58) Field (Int.Cl. 7 , DB name) F16H 55/32-55/56 B29C 45/00-45/84 B29D 31/00 B29L 31:32
Claims (1)
た合成樹脂部本体とから成り、合成樹脂部本体は、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リブとを
有する合成樹脂製プーリにおいて、前記内外円筒部の隣
接するリブの内端部間および外端部間と対向する位置に
ゲートを交互に配置したことを特徴とする合成樹脂製プ
ーリ。(57) [Claims 1] A rolling bearing and a synthetic resin portion main body integrally formed therearound, wherein the synthetic resin portion main body has an inner diameter cylindrical portion fixed to an outer ring of the rolling bearing. A synthetic resin pulley having an outer diameter cylindrical portion having a belt guide surface, a disk portion provided between the inner and outer cylindrical portions, and a plurality of ribs radially formed on the disk portion; Wherein the gates are alternately arranged at positions opposing the inner ends and the outer ends of adjacent ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21021393A JP3506735B2 (en) | 1993-08-25 | 1993-08-25 | Synthetic resin pulley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21021393A JP3506735B2 (en) | 1993-08-25 | 1993-08-25 | Synthetic resin pulley |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0763249A JPH0763249A (en) | 1995-03-07 |
| JP3506735B2 true JP3506735B2 (en) | 2004-03-15 |
Family
ID=16585665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21021393A Expired - Fee Related JP3506735B2 (en) | 1993-08-25 | 1993-08-25 | Synthetic resin pulley |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3506735B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000002317A (en) * | 1998-06-16 | 2000-01-07 | Nippon Seiko Kk | Pulley |
| JP2009174638A (en) | 2008-01-24 | 2009-08-06 | Jtekt Corp | Resin pulley |
| JP6277830B2 (en) * | 2014-04-01 | 2018-02-14 | 日本精工株式会社 | Synthetic resin pulley manufacturing method |
| JP2017065642A (en) * | 2015-10-02 | 2017-04-06 | 株式会社ブリヂストン | Non-pneumatic tire and its manufacturing method |
-
1993
- 1993-08-25 JP JP21021393A patent/JP3506735B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0763249A (en) | 1995-03-07 |
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