JP2553098B2 - Ring for shape retention - Google Patents
Ring for shape retentionInfo
- Publication number
- JP2553098B2 JP2553098B2 JP62216002A JP21600287A JP2553098B2 JP 2553098 B2 JP2553098 B2 JP 2553098B2 JP 62216002 A JP62216002 A JP 62216002A JP 21600287 A JP21600287 A JP 21600287A JP 2553098 B2 JP2553098 B2 JP 2553098B2
- Authority
- JP
- Japan
- Prior art keywords
- ring
- boot
- diameter
- joint
- small
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/703—Bellows
Landscapes
- Sealing Devices (AREA)
- Diaphragms And Bellows (AREA)
Description
【発明の詳細な説明】 〔産業上の利用範囲〕 この発明はジョイントブーツ保形用リングに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application range] The present invention relates to a joint boot shape retaining ring.
従来、産業機械および自動車等に用いられるジョイン
ト、たとえばステアリングラック等速ジョイントまたは
ボールジョイントなどを高速で長時間運転すると、ジョ
イント自体からの発熱およびグリースの剪断に起因する
発熱によってブーツ（保護カバー）自体が軟らかくな
り、その結果機械的強度（弾性率）が低下し、ブーツが
膨張して径が大きくなり、ブーツに加わる遠心力はさら
に大きくなる。このような繰り返しによって、ブーツの
径はますます太くなり、損傷の恐れがある。したがっ
て、このような問題を解決するために、ブーツの蛇腹部
分の谷部に弾性体リングを装着する方法が採られていた
が、この方法では、通常の場合、弾性体自体の温度に対
する機械的特性がブーツ自体の特性ときわめて類似して
いるため、改善効果が多少得られたとしても、根本的解
決には至らなかった。しかも、弾性体リングには一般に
合成ゴム（NBRなど）が使用されるので摩擦係数が大き
く、ブーツ自体の材質とも近似しているので、回転に伴
う伸縮によってブーツの表面を摩耗させるということに
もなった。Conventionally, when a joint used in industrial machines, automobiles, etc., such as a steering rack constant velocity joint or a ball joint, is operated at high speed for a long time, the boot (protective cover) itself is generated due to heat generated from the joint itself and heat generated by shearing of grease. Becomes softer, and as a result, the mechanical strength (elastic modulus) decreases, the boot expands, the diameter increases, and the centrifugal force applied to the boot further increases. With such repetition, the diameter of the boot becomes larger and there is a risk of damage. Therefore, in order to solve such a problem, a method of attaching an elastic body ring to the valley of the bellows part of the boot was adopted, but in this method, in the usual case, the mechanical body against the temperature of the elastic body itself is used. Since the characteristics are very similar to those of the boot itself, even if some improvement effect was obtained, it was not a fundamental solution. Moreover, since synthetic rubber (NBR, etc.) is generally used for the elastic ring, it has a large coefficient of friction and is similar to the material of the boot itself, so it also wears the surface of the boot due to expansion and contraction due to rotation. became.
このように従来の技術においては、耐熱性、耐油性に
優れ、かつ、摩擦係数が小さく、ジョイント部分のグリ
ース温度が上昇しても軟化することなく、摩耗係数も小
さいジョイントブーツ保形用リングは得られないという
問題点があった。As described above, in the conventional technology, the joint boot shape retaining ring which has excellent heat resistance and oil resistance, has a small friction coefficient, does not soften even when the grease temperature of the joint portion rises, and has a small wear coefficient is There was a problem that I could not get it.
上記の問題点を解決するために、この発明において
は、熱可塑性フッ素樹脂と含フッ素エラストマーとの組
成物で形成されたジョイントブーツ保形用リングとする
手段を採用したものである。以下その詳細を述べる。In order to solve the above problems, the present invention adopts a means for forming a joint boot shape-retaining ring formed of a composition of a thermoplastic fluororesin and a fluoroelastomer. The details are described below.
まず、この発明における熱可塑性フッ素樹脂は四フッ
化エチレン・エチレン系共重合樹脂、フッ化ビニリデン
系樹脂、三フッ化エチレン・エチレン系共重合樹脂、フ
ッ化ビニリデン・四フッ化エチレン系共重合樹脂等で耐
熱性、耐摩擦摩耗性の優れた樹脂であり、たとえば、旭
硝子社製の商品名アフロンCOP、呉羽化学社製の商品名K
Fポリマー、アライドケミカル社製の商品名ハーラーな
どを挙げることが出来る。First, the thermoplastic fluororesin in this invention is tetrafluoroethylene / ethylene copolymer resin, vinylidene fluoride resin, ethylene trifluoride / ethylene copolymer resin, vinylidene fluoride / tetrafluoroethylene copolymer resin. It is a resin with excellent heat resistance and abrasion resistance, such as Aflon COP manufactured by Asahi Glass Co., Ltd. and K manufactured by Kureha Chemical Co., Ltd.
Examples include F polymer and the product name Harler manufactured by Allied Chemical Company.
つぎにこの発明における含フッ素エラストマーは、四
フッ化エチレン・プロピレン系共重合エラストマー、フ
ッ化ビニリデン・六フッ化プロピレン系共重合エラスト
マーなどで、耐熱性、耐薬品性、耐油性などに富む合成
ゴムであり、たとえば旭硝子社製の商品名アフラス、ダ
イキン社製の商品名ダイエルなどを挙げることが出来
る。Next, the fluorine-containing elastomer in the present invention is a tetrafluoroethylene / propylene-based copolymer elastomer, vinylidene fluoride / hexafluoropropylene-based copolymer elastomer, or the like, which is a synthetic rubber excellent in heat resistance, chemical resistance, oil resistance and the like. For example, the product name Afras manufactured by Asahi Glass Co., Ltd. and the product name DAIEL manufactured by Daikin Co., Ltd. can be mentioned.
そして、このような熱可塑性フッ素樹脂と含フッ素エ
ラストマーとの混合割合は30:70から70:30の範囲である
ことが望ましい。なぜならば、熱可塑性フッ素樹脂が上
記の下限値未満の少量のときは摩擦係数が大であり、ま
た逆に上限値を越える多量のときはゴム弾性に乏しく、
シール性に劣り、使用上好ましくないからである。The mixing ratio of such a thermoplastic fluororesin and the fluoroelastomer is preferably in the range of 30:70 to 70:30. Because, when the amount of the thermoplastic fluororesin is less than the above lower limit, the friction coefficient is large, and conversely, when the amount exceeds the upper limit, the rubber elasticity is poor,
This is because the sealability is poor and it is not preferable in use.
さらに、この発明の組成物をリング状に成形する方法
は特に限定されるものではないが、たとえばフッ素ゴム
の加工法を用い、フィラーとしてフッ素樹脂を添加する
か、または溶融フッ素樹脂の加工法を用い、フィラーと
してフッ素ゴムを添加する方法を用いるとよい。Further, the method of molding the composition of the present invention into a ring shape is not particularly limited, but for example, a processing method of fluororubber is used, and a fluororesin is added as a filler, or a processing method of molten fluororesin is used. It is preferable to use a method of adding fluororubber as a filler.
この発明のような塑性体と弾性体とからなる塑性物を
用いたリングは、リングに加わる遠心力（応力）に比例
して変形するのではなく、遠心力（応力）が大きくなる
につれてむしろ歪みにくくなり、また温度上昇に対して
も弾性率は余り低下しないという作用を示す。A ring using a plastic material composed of a plastic body and an elastic body as in the present invention does not deform in proportion to the centrifugal force (stress) applied to the ring, but rather distorts as the centrifugal force (stress) increases. It also has the effect that the elastic modulus does not decrease so much even when the temperature rises.
実施例および比較例に用いたジョイントブーツは図に
示すような二つの山部と二つの谷（溝）部を有するシリ
コーンゴム製の蛇腹であり、ジョイント部分に装着した
ときの各部分の外径は小径取付け部１は39mm、大径取付
け部２は100mm、小径山部３は73mm、大径山部４は90m
m、小径谷部５は52mm、大径谷部６は67mmのものであっ
た。The joint boots used in the examples and comparative examples are bellows made of silicone rubber having two peaks and two valleys (grooves) as shown in the figure, and the outer diameter of each part when attached to the joint part. Is 39 mm for the small diameter mounting part 1, 100 mm for the large diameter mounting part 2, 73 mm for the small diameter mountain part 3 and 90 m for the large diameter mountain part 4.
m, the small-diameter valley portion 5 was 52 mm, and the large-diameter valley portion 6 was 67 mm.
また、この発明のジョイントブーツ保形用リングとし
て、四フッ化エチレン・エチレン共重合体からなる塑性
体（旭硝子社製：商品名アフロンCOP Ｃ−88A）と四フ
ッ化エチレン・プロピレン共重合体からなる弾性体（同
社製：商品名アフラス150P）とを重量比40:60に配合し
た組成物を300℃の金型で加熱加圧成形しＯリングを得
た。ショアー硬度D75程度にした太さ5.7mm、内径がそれ
ぞれ51.6mmおよび66.6mmの小径リング７および大径リン
グ８を作製し、それぞれを小径谷部５および大径谷部６
に装着した。The joint boot shape-retaining ring of the present invention comprises a tetrafluoroethylene / ethylene copolymer plastic (Asahi Glass Co., Ltd .: trade name AFLON COP C-88A) and a tetrafluoroethylene / propylene copolymer. An elastic body (manufactured by the same company: trade name: Aflas 150P) was mixed at a weight ratio of 40:60 with heat and pressure molding in a mold at 300 ° C to obtain an O-ring. A small-diameter ring 7 and a large-diameter ring 8 having a thickness of 5.7 mm and inner diameters of 51.6 mm and 66.6 mm, respectively, having a Shore hardness of D75, are produced, and the small-diameter valley portion 5 and the large-diameter valley portion 6 are respectively formed.
I attached it to.
つぎにこのような保形用リングを装着したジョイント
ブーツについて室温（25℃）下の回転膨張試験を実施し
た。ここで回転膨張試験は室温雰囲気下にてジョイント
ブーツを各回転数で15分間回転させ、その後回転させな
がらジョイントブーツの山部外径をハイトゲージを用い
て測定した。この条件のもとに膨張変形量（回転膨張試
験前後の値の差）を求め、得られた値を表にまとめた。
なお、異常変形とは上記膨張変形量が10mm以上となる現
象である。Next, a joint boot equipped with such a shape retaining ring was subjected to a rotational expansion test at room temperature (25 ° C). Here, in the rotational expansion test, the joint boot was rotated at each rotation speed for 15 minutes in a room temperature atmosphere, and then the outer diameter of the mountain portion of the joint boot was measured using a height gauge while rotating. Under these conditions, the amount of expansion deformation (difference between the values before and after the rotational expansion test) was obtained, and the obtained values are summarized in the table.
The abnormal deformation is a phenomenon in which the expansion deformation amount is 10 mm or more.
一方、この発明の保形用リングの効果を比較するため
に、上記のジョイントブーツのみの場合（比較例１）、
および上記の小径リング７および大径リング８と形状寸
法の全く同じNBR（ニトリルブタジエンラバー、硬度シ
ョアーHs 70）製リングを前記と同様ブーツに装着して
（比較例２）回転膨張試験を行ない、それぞれについて
得られた値を表に併記した。 On the other hand, in order to compare the effect of the shape-retaining ring of the present invention, in the case of only the joint boot (Comparative Example 1),
And a ring made of NBR (nitrile butadiene rubber, hardness shore H s 70) having the same shape and dimensions as those of the small-diameter ring 7 and the large-diameter ring 8 was mounted on the boot in the same manner as described above (Comparative Example 2), and a rotational expansion test was conducted. The values obtained for each are also shown in the table.
以上の表から、この発明の実施例は比較例１および２
に比べ、膨張変形量は少なく、回転が高速になるにつれ
て膨張変形量の差が大きくなることが明らかとなった。From the above table, the examples of the present invention are comparative examples 1 and 2.
It was found that the amount of expansion and deformation was smaller than that in Example 1, and the difference in the amount of expansion and deformation increased as the rotation speed increased.
以上のことから明らかなように、この発明のジョイン
トブーツ保形用リングは耐熱性は勿論、摩擦係数も小さ
く、ジョイント部分のグリース温度が上昇しても軟化す
ることなく、摩擦係数も小さく、高速回転時においても
ブーツの膨張を充分に抑制することができる。したがっ
て、この発明の意義はきわめて大きいということができ
る。As is apparent from the above, the joint boot shape retaining ring of the present invention has not only heat resistance but also a small friction coefficient, does not soften even when the grease temperature of the joint portion rises, has a small friction coefficient, and has a high speed. The expansion of the boot can be sufficiently suppressed even during rotation. Therefore, it can be said that the significance of the present invention is extremely large.
図はこの発明のジョイントブーツ保形用リングの実施状
態を例示する要部縦断面図である。 １……小径取付け部、２……大径取付け部、３……小径
山部、４……大径山部、５……小径谷部、６……大径谷
部、７……小径リング、８……大径リング。FIG. 1 is a longitudinal sectional view of an essential part illustrating an implementation state of a joint boot shape retaining ring according to the present invention. 1 ... Small diameter mounting portion, 2 ... Large diameter mounting portion, 3 ... Small diameter mountain portion, 4 ... Large diameter mountain portion, 5 ... Small diameter valley portion, 6 ... Large diameter valley portion, 7 ... Small diameter ring , 8 ... Large diameter ring.
Claims (1)
ーとからなることを特徴とするジョイントブーツ保形用
リング。1. A joint boot shape retaining ring comprising a thermoplastic fluororesin and a fluoroelastomer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62216002A JP2553098B2 (en) | 1987-08-29 | 1987-08-29 | Ring for shape retention |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62216002A JP2553098B2 (en) | 1987-08-29 | 1987-08-29 | Ring for shape retention |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6458867A JPS6458867A (en) | 1989-03-06 |
| JP2553098B2 true JP2553098B2 (en) | 1996-11-13 |
Family
ID=16681767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62216002A Expired - Fee Related JP2553098B2 (en) | 1987-08-29 | 1987-08-29 | Ring for shape retention |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2553098B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8262488B2 (en) | 2007-08-17 | 2012-09-11 | Ntn Corporation | Silicone boot for constant velocity universal joint and constant velocity universal joint |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6184848A (en) * | 1984-10-03 | 1986-04-30 | Matsushita Electric Ind Co Ltd | Substrate for bump formation |
| JPH071531Y2 (en) * | 1987-08-31 | 1995-01-18 | キーパー株式会社 | Flexible boots for constant velocity joints |
| US11940020B2 (en) * | 2020-12-07 | 2024-03-26 | Steering Solutions Ip Holding Corporation | Rubber outboard deflector ring |
-
1987
- 1987-08-29 JP JP62216002A patent/JP2553098B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8262488B2 (en) | 2007-08-17 | 2012-09-11 | Ntn Corporation | Silicone boot for constant velocity universal joint and constant velocity universal joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6458867A (en) | 1989-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |