JPS6318834Y2 - - Google Patents
Info
- Publication number
- JPS6318834Y2 JPS6318834Y2 JP1982176580U JP17658082U JPS6318834Y2 JP S6318834 Y2 JPS6318834 Y2 JP S6318834Y2 JP 1982176580 U JP1982176580 U JP 1982176580U JP 17658082 U JP17658082 U JP 17658082U JP S6318834 Y2 JPS6318834 Y2 JP S6318834Y2
- Authority
- JP
- Japan
- Prior art keywords
- lip
- mold
- ball
- sphere
- 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
Links
- 239000000463 material Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Description
【考案の詳細な説明】
本考案は玉軸受用プラスチツク保持器の改良に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in plastic cages for ball bearings.
従来、玉軸受用冠型プラスチツク保持器Raは
第１図に示すように、すなわち、環状部分１ａ、
片方から玉を挿入可能とする開口部をもつポケツ
ト２ａ、隣接する前記ポケツト間にある橋絡部３
ａ、前記橋絡部から軸方向に玉を抱えるように伸
長していて前記ポケツトに玉を保持するためのリ
ツプ４ａを備えている。 Conventionally, a crown-shaped plastic retainer Ra for ball bearings has an annular portion 1a, an annular portion 1a,
A pocket 2a having an opening into which a ball can be inserted from one side, and a bridge portion 3 between the adjacent pockets.
a. A lip 4a is provided which extends from the bridging portion in the axial direction so as to hold the ball and holds the ball in the pocket.
このような構成のプラスチツク保持器は、一般
に射出成形法によつて加工するが、例えば第２図
に示すような成形金型構造にあつては、保持器
Raのポケツト２ａ用の成形型６ａと、橋絡部３
ａと、リツプ４ａとの成形型７ａと環状部分１ａ
の成形型８ａを包含して、前記保持器Raを成形
後に離型（成形型から保持器を分離する）する
際、前記成形型６ａは部分球体６１ａとそれに連
なるロツド部６２ａからなつて、その接合部分６
３ａがリツプ成形のためにくびれているので前記
リツプを弾性変形させて無理抜きを行うことにな
る。 Plastic cages with such a structure are generally processed by injection molding, but for example, in the case of a mold structure as shown in FIG.
Molding die 6a for Ra's pocket 2a and bridge portion 3
a, the mold 7a of the lip 4a, and the annular portion 1a.
When releasing the retainer Ra after molding (separating the retainer from the mold), the mold 6a consists of a partial sphere 61a and a rod portion 62a connected thereto. Joint part 6
Since the lip 3a is constricted due to the lip forming, the lip is elastically deformed and forcefully removed.
その無理抜きの状態を第３図、第４図によつて
詳しく説明する。第３図は第４図の矢視Ａ−Ａか
らみた断面図、第４図はポケツト部分を開口部側
からみた正面図であつて、６ａは保持器半径方向
幅と同一寸法のポケツト成形型で６１ａはポケツ
トを成形する部分球体でその外周部は直径寸法が
ｄであり、ロツド部６２ａと一体となつて成形装
置に固定されている。 The forced removal state will be explained in detail with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view taken from arrow A-A in FIG. 4, and FIG. 4 is a front view of the pocket portion seen from the opening side, where 6a is a pocket mold having the same dimensions as the radial width of the cage. Reference numeral 61a is a partial sphere for forming the pocket, and its outer peripheral portion has a diameter of d, and is fixed to the molding device integrally with the rod portion 62a.
成形時、前記ポケツトの中心Ｏと前記球体の中
心O1とは一致しているが、離型する際に、球体
の中心O1は第３図に示すように上方に移動する。 During molding, the center O of the pocket and the center O1 of the sphere coincide, but when the mold is released, the center O1 of the sphere moves upward as shown in FIG.
ポケツトの開口部寸法ｌは玉がポケツト２ａか
ら脱落しないように、玉の直径（球体寸法よりわ
ずかに小さい）より小さいので、前記球体の中心
O1が上方に移動してO2にきたとき、無理抜き量
が最大となり、第３図に示す想像線（２点鎖線）
のようにリツプ４ａはリツプ先端部４３ａが前記
球体によつて押し拡げ力を受けて弾性変形させら
れ、第４図にて明らかなように、球体６１ａとリ
ツプ先端部４３ａの当り状態は、前記リツプ先端
部が平担部４１ａとポケツト面との陵線になつて
いて球体６１ａの直径ｄより小さい直径をもつ同
心円となつているので、リツプの両端の尖項部Ｐ
と球体外周部とで点当りになつて、リツプ半径方
向幅の中央部で球体との間にすきまδが生じるよ
うな変形のしかたになるため、リツプの変形が大
きい。 The opening dimension l of the pocket is smaller than the diameter of the ball (slightly smaller than the sphere dimension) so that the ball does not fall out of the pocket 2a, so that the center of the sphere
When O 1 moves upward and reaches O 2 , the amount of forced extraction becomes maximum, and the imaginary line (double-dashed line) shown in Figure 3
As shown in FIG. 4, the tip end 43a of the lip 4a is elastically deformed by the force applied by the sphere, and as is clear from FIG. The tip of the lip forms a ridge between the flat part 41a and the pocket surface, forming a concentric circle with a diameter smaller than the diameter d of the sphere 61a.
The deformation of the lip is large because the deformation occurs in such a way that the lip and the outer periphery of the sphere hit a point, and a gap δ is created between the lip and the sphere at the center of the radial width of the lip.
このため、リツプ根元部４２ａの応力が高くな
る。設計者はポケツトから玉の脱落を防ぐのに、
開口部寸法ｌを球体直径寸法ｄよりかなり小さく
して、前記リツプ先端部４３ａが玉を大きく抱え
るように設計上の配慮をするので、根元部４２ａ
にクラツクが入り離型時にリツプ折損が発生す
る。又、微少なクラツクで折損に至らない場合で
も、保持器を玉軸受に組込む時や、軸受使用中に
リツプが折損する事故に結びつくことがある。 Therefore, the stress at the lip root portion 42a increases. The designer tried to prevent the ball from falling out of the pocket.
Since the opening dimension l is made considerably smaller than the sphere diameter dimension d, and consideration is given to the design so that the tip end portion 43a of the lip can hold a large ball, the root portion 42a
Cracks occur in the mold and lip breakage occurs during demolding. Furthermore, even if a slight crack does not result in breakage, it may lead to an accident in which the lip breaks when the cage is assembled into a ball bearing or while the bearing is in use.
上記ではポケツト成形型の離型時の問題点につ
いてのべているが、完成された保持器を軸受に組
みこむときにもリツプ４ａは玉によつて変形させ
られるのでリツプの根元部に折損がおきることが
ある。 The above describes the problem when releasing the pocket mold, but when the completed cage is assembled into the bearing, the lip 4a is deformed by the balls, so the root part of the lip may break. Something happens.
本考案はこの問題点を解決するために、離型時
の無理抜き量を小さくしてリツプ部の折損がおき
ない玉軸受用冠型プラスチツク保持器を提供する
ことを目的とする。 In order to solve this problem, it is an object of the present invention to provide a crown-shaped plastic retainer for ball bearings that reduces the amount of forcible removal during mold release and prevents breakage of the lip portion.
次に本考案の実施例を第５図ないし第８図によ
つて説明する。第５図は本考案による保持器の要
部を示す斜視図であつて、第１図に示す従来例と
同じように、プラスチツク保持器Ｒは環状部分
１、ポケツト２、橋絡部３、リツプ４からなる構
成であるが、前記ポケツトの開口部５において、
リツプ平担部４１の先端部４３が保持器の半径方
向幅の中央から幅両側に、すなわち外側および内
側に向つて保持器成形における無理抜き量を軽減
するクサビ形状の逃げ部４４を備えていることを
特徴としている。 Next, an embodiment of the present invention will be explained with reference to FIGS. 5 to 8. FIG. 5 is a perspective view showing the main parts of the cage according to the present invention. Like the conventional example shown in FIG. 4, but in the opening 5 of the pocket,
The tip end portion 43 of the flat lip portion 41 is provided with a wedge-shaped relief portion 44 extending from the center of the radial width of the cage on both sides of the width, that is, toward the outside and inside, to reduce the amount of forced extraction during molding of the cage. It is characterized by
このようなポケツト開口部の形状を得るために
は、第６図に示すようなポケツト成形型６を用い
る。 In order to obtain such a shape of the pocket opening, a pocket mold 6 as shown in FIG. 6 is used.
第１図に示すような従来の保持器用のポケツト
成形型では部分球体６１ａとそれに連なるロツド
部６２ａの接合部の形状は球体のもつ外周の球面
とロツド端部の平面が単に交又して接合部となつ
ているのに比べ、本考案の保持器を得るための成
形型では、前記接合部に相当する部分に余肉部６
３（一体でも別体を接合してもよい）を設けてい
る。 In the conventional pocket mold for a retainer as shown in Fig. 1, the shape of the joint between the partial sphere 61a and the rod portion 62a connected thereto is such that the spherical surface on the outer periphery of the sphere and the flat surface of the rod end simply intersect and join. In contrast, in the mold for obtaining the retainer of the present invention, there is an excess thickness 6 in the part corresponding to the joint part.
3 (which may be integrated or separate pieces may be joined).
本考案に係る成形型によつて保持器を成形し、
離型する際、第７図に示すように、ポケツト成形
型６の球体６１の中心がO1から上方に移動して
O2にきたとき、リツプ４の変形は想像線のよう
に最大となる。 Molding a cage using the mold according to the present invention,
When releasing the mold, as shown in FIG. 7, the center of the sphere 61 of the pocket mold 6 moves upward from O1 .
When reaching O 2 , the deformation of lip 4 becomes maximum as shown by the imaginary line.
しかし、ポケツト開口部５に逃げ部４４が設け
られているために、第８図に示すように、リツプ
４の先端部と球体の当り点が前記リツプの半径方
向幅の中央部Ｑになるので、従来例が両端部Ｐで
当つてすきまδが生じるのに比べると前記δに相
当する量だけリツプの変形は小さくなる。このこ
とはリツプ根元部４２における応力を小さくして
クラツクが入りにくい状態を意味する。 However, since the pocket opening 5 is provided with a relief part 44, the point of contact between the tip of the lip 4 and the sphere is at the center Q of the radial width of the lip, as shown in FIG. Compared to the conventional example in which a gap δ occurs due to contact at both ends P, the deformation of the lip is reduced by an amount corresponding to δ. This means that the stress at the lip root portion 42 is reduced, making it difficult for cracks to occur.
以上実施例によつて説明した如く、本考案にお
いてはポケツト開口部の半径方向の（内外周の）
の両側に、リツプ幅の中央から縁側に向つて高さ
の増大するクサビ形状の逃げ部を設けて、従来の
保持器のようにリツプ先端部の陵線が同心円を有
していないので玉を抱くのに必要な抱え量が十分
確保出来、しかも実質的には玉を抱くのに重要で
ないリツプ半径方向の両端部が逃げているので、
離型する際にリツプの折損がなくなるし、さらに
は軸受に保持器を組込むのに必要な組込力が少く
てすむし、組込時折損もおきることはないなど品
質面で信頼性の高い保持器となる。 As explained above with reference to the embodiments, in the present invention, the radial direction (inner and outer periphery) of the pocket opening is
Wedge-shaped relief parts are provided on both sides of the lip width, increasing in height from the center of the lip width toward the edge. Unlike conventional cages, the ridges at the tip of the lip do not have concentric circles, so balls can be easily The amount of holding necessary for holding the ball is secured, and both ends of the lip in the radial direction, which are not important for holding the ball, are escaped, so
It is highly reliable in terms of quality, as there is no breakage of the lip during demolding, less assembly force is required to assemble the cage into the bearing, and no damage occurs during assembly. It becomes a retainer.
第１図ないし第４図は従来の保持器を示し、第
１図は要部斜視図、第２図は射出成形型の概略
図、第３図、第４図は説明図であつて夫々要部断
面図、要部正面図、第５図ないし第８図は本考案
の実施例を示し、第５図は要部斜視図、第６図は
ポケツト成形型の要部概略図、第７図、第８図は
説明図であつて夫々要部断面図、要部正面図であ
る。
符号の説明、Ｒ……保持器、１……環状部分、
２……ポケツト、３……橋絡部、４……リツプ、
４４……逃げ部、５……ポケツト開口部、６……
ポケツト成形型、６３……余肉部。
1 to 4 show a conventional cage, FIG. 1 is a perspective view of the main parts, FIG. 2 is a schematic diagram of an injection mold, and FIGS. 3 and 4 are explanatory views, each showing the main parts. 5 to 8 show an embodiment of the present invention, FIG. 5 is a perspective view of the main part, FIG. 6 is a schematic view of the main part of the pocket mold, and FIG. , and FIG. 8 are explanatory drawings, which are a sectional view of the main part and a front view of the main part, respectively. Explanation of symbols, R...retainer, 1...annular part,
2...Pocket, 3...Bridging section, 4...Rip,
44...Escape part, 5...Pocket opening, 6...
Pocket mold, 63...Excess portion.
Claims (1)
する開口部を備えた球面の一部によるポケツト
と、隣接するポケツト間にある橋絡部と、前記橋
絡部から軸方向に玉を抱えるように伸長している
リツプとからなるプラスチツク保持器において、
ポケツト開口部を形成している前記リツプの先端
部が半径方向内側に、リツプ幅の中央部から縁側
に向つて高さの増大するクサビ形状の逃げ部を有
していることを特徴とするプラスチツク保持器。 a pocket formed by a part of a spherical surface having an annular part, an opening into which a ball can be inserted from one side in the axial direction, a bridging part between adjacent pockets, and a ball held in the axial direction from the bridging part. In a plastic retainer consisting of a lip extending like this,
A plastic material characterized in that the distal end of the lip forming the pocket opening has a wedge-shaped relief part on the inside in the radial direction, the height increasing from the center of the lip width toward the edge. retainer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17658082U JPS5981813U (en) | 1982-11-24 | 1982-11-24 | plastic retainer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17658082U JPS5981813U (en) | 1982-11-24 | 1982-11-24 | plastic retainer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5981813U JPS5981813U (en) | 1984-06-02 |
| JPS6318834Y2 true JPS6318834Y2 (en) | 1988-05-26 |
Family
ID=30383875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17658082U Granted JPS5981813U (en) | 1982-11-24 | 1982-11-24 | plastic retainer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5981813U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008175217A (en) * | 2007-01-16 | 2008-07-31 | Ntn Corp | Double row angular contact ball bearing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007309527A (en) * | 2007-08-10 | 2007-11-29 | Jtekt Corp | Resin cage for rolling bearing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1594582A (en) * | 1977-10-27 | 1981-07-30 | Ransome Hoffmann Pollard | Cage for a rolling element bearing |
| JPS56113826A (en) * | 1979-12-24 | 1981-09-08 | Skf Kugellagerfabriken Gmbh | Plastic made snap holder for ball bearing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53163450U (en) * | 1977-05-30 | 1978-12-21 |
-
1982
- 1982-11-24 JP JP17658082U patent/JPS5981813U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1594582A (en) * | 1977-10-27 | 1981-07-30 | Ransome Hoffmann Pollard | Cage for a rolling element bearing |
| JPS56113826A (en) * | 1979-12-24 | 1981-09-08 | Skf Kugellagerfabriken Gmbh | Plastic made snap holder for ball bearing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008175217A (en) * | 2007-01-16 | 2008-07-31 | Ntn Corp | Double row angular contact ball bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5981813U (en) | 1984-06-02 |
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