JPH0446150Y2 - - Google Patents
Info
- Publication number
- JPH0446150Y2 JPH0446150Y2 JP16300486U JP16300486U JPH0446150Y2 JP H0446150 Y2 JPH0446150 Y2 JP H0446150Y2 JP 16300486 U JP16300486 U JP 16300486U JP 16300486 U JP16300486 U JP 16300486U JP H0446150 Y2 JPH0446150 Y2 JP H0446150Y2
- Authority
- JP
- Japan
- Prior art keywords
- dust cover
- thin film
- cover body
- cover
- urethane
- 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
- 239000000428 dust Substances 0.000 claims description 31
- 239000010409 thin film Substances 0.000 claims description 19
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 9
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000004519 grease Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Landscapes
- Gasket Seals (AREA)
- Sealing Devices (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
例えば自動車懸架装置および操舵装置等に使用
されるボールジヨイントのダストカバーに関す
る。[Detailed Description of the Invention] Industrial Fields of Use The present invention relates to dust covers for ball joints used in, for example, automobile suspension systems and steering systems.
従来の技術
ダストカバーを発泡ウレタンにて形成すること
は、英国特許第954690号によつて知られている。
ダストカバーを発泡ウレタンにて形成した場合
は、合成ゴムにて形成した場合に較べて、ダスト
カバー変形時の変形抵抗が極めて低く、例えばボ
ールジヨイントのボールスタツドの作動トルクを
低減するのに有効である。BACKGROUND OF THE INVENTION It is known from British Patent No. 954,690 to form a dust cover from urethane foam.
When the dust cover is made of urethane foam, the deformation resistance when the dust cover deforms is extremely low compared to when it is made of synthetic rubber, and it is effective for reducing the operating torque of ball studs in ball joints, for example. It is.
考案が解決しようとする問題点
しかしダストカバーを発泡ウレタンにて形成し
た場合、ダストカバーに適した高い柔軟性を有す
る高い発泡率で発泡形成すると、その発泡膜に通
気性が生じる。そのためこの発泡ウレタン製ダス
トカバーをボールジヨイントに使用すると、発泡
膜を透過してボールジヨイント内に水が侵入する
問題がある。と共に、ダストカバー内のグリース
等の潤滑剤が発泡膜を透過して外部へ流出する問
題がある。Problems to be Solved by the Invention However, when the dust cover is formed from urethane foam, if the dust cover is formed by foaming at a high foaming rate that has high flexibility and is suitable for the dust cover, the foamed membrane will have air permeability. Therefore, when this foamed urethane dust cover is used for a ball joint, there is a problem in that water permeates through the foam membrane and enters the ball joint. Additionally, there is a problem in that lubricant such as grease in the dust cover passes through the foamed membrane and flows out.
また、高い発泡率で発泡形成した発泡ウレタン
製ダストカバーは、その内周面同志またはその外
周面同志が接触し、相互に摩擦すると、発泡膜が
容易に破損してしまい、最も重要なシール機能を
失つてしまう問題がある。 In addition, if a dust cover made of foamed urethane formed by foaming with a high foaming rate comes into contact with its inner peripheral surfaces or its outer peripheral surfaces and rubs against each other, the foamed membrane will be easily damaged, and the most important sealing function will be There is a problem of losing the .
問題点を解決するための手段
カバー本体の発泡率を薄膜の発泡率より高くす
る。Measures to solve the problem: Make the foaming rate of the cover body higher than that of the thin film.
作 用
カバー本体内外周面に被覆したウレタン樹脂の
薄膜は、非透過性であるので、水のボールジヨイ
ント内への侵入およびグリース等の潤滑剤の外部
への流出がない、と共にダストカバー外部からの
衝撃により仮に外周面側の薄膜が破損したとして
も、残つた内周面側の薄膜によつてダストカバー
内への水の侵入が防止される。また、ウレタン樹
脂の薄膜は、発泡ウレタンに較べて摩擦に対する
強度が高いので、ダストカバーの内周面同志また
は外周面同志が接触しても容易に破損することは
ない。Function The thin film of urethane resin coated on the inner and outer circumferential surfaces of the cover body is non-permeable, preventing water from entering the ball joint and lubricants such as grease from flowing out to the outside. Even if the thin film on the outer peripheral surface side were to be damaged by the impact from the dust cover, the remaining thin film on the inner peripheral surface side would prevent water from entering into the dust cover. Further, since the thin film of urethane resin has higher strength against friction than foamed urethane, it will not be easily damaged even if the inner circumferential surfaces or outer circumferential surfaces of the dust cover come into contact with each other.
実施例
以下、本考案の実施例のその構成を図面に基づ
いて説明する。Embodiment Hereinafter, the configuration of an embodiment of the present invention will be explained based on the drawings.
第１図は本考案の実施例によるダストカバー１
０を装着したボールジヨイント１を表わしてい
る。図において、２は柄３と球状頭部５とより成
るボールスタツド、６は球状頭部５を摺動自在に
包持するアツパーベアリング、および７はソケツ
トである。柄３の外周と、ソケツト７の外周には
ダストカバー１０の取付部としてそれぞれ断面円
弧状の環状溝４，９が形成されている。 Figure 1 shows a dust cover 1 according to an embodiment of the present invention.
This shows ball joint 1 with 0 attached. In the figure, 2 is a ball stud consisting of a handle 3 and a spherical head 5, 6 is an upper bearing that slidably supports the spherical head 5, and 7 is a socket. Annular grooves 4 and 9 each having an arcuate cross section are formed on the outer periphery of the handle 3 and the outer periphery of the socket 7 as attachment parts for the dust cover 10.
ダストカバー１０は略円筒釣鐘状であり、両端
に小開口部１２および大開口部１３を有する。小
開口部１２はボールスタツド２の柄３外周の環状
溝４に、大開口部１３はソケツト７外周の環状溝
９にそれぞれ嵌合するようにセツトされている。
これら開口部１２，１３内には、コイルスプリン
グ１４，１５が埋設されているため、開口部１
２，１３が自身の緊迫力によりつぶれることはな
い。ダストカバー１０のカバー本体１１は、高い
発泡率で発泡形成した発泡ウレタン製である。こ
のカバー本体１１の内外周面１６，１７はウレタ
ン樹脂の薄膜１８，１９により別途被覆されてい
る。薄膜１８，１９は、ウレタン樹脂原料をメチ
ルエチルケトンとジメチルホルムアミドが２：３
の割合で混合された溶剤で溶かした塗料に成形後
のカバー本体を浸漬し、その後150℃／min／ｍ
で乾燥することにより形成されたものである。 The dust cover 10 has a substantially cylindrical bell shape and has a small opening 12 and a large opening 13 at both ends. The small opening 12 is set to fit into the annular groove 4 on the outer periphery of the handle 3 of the ball stud 2, and the large opening 13 is set to fit into the annular groove 9 on the outer periphery of the socket 7.
Coil springs 14 and 15 are embedded in these openings 12 and 13, so the opening 1
2 and 13 will not be crushed by their own tension. The cover body 11 of the dust cover 10 is made of urethane foam formed by foaming at a high foaming rate. The inner and outer circumferential surfaces 16 and 17 of the cover body 11 are separately coated with thin films 18 and 19 of urethane resin. The thin films 18 and 19 are made by using a urethane resin raw material of methyl ethyl ketone and dimethyl formamide in a ratio of 2:3.
The molded cover body is immersed in paint dissolved in a solvent mixed at a ratio of 150℃/min/m.
It was formed by drying it.
カバー本体１１は高い発泡率の発泡ウレタン製
であるため、水およびグリース等の潤滑剤を透過
させるが、前述の如く形成された薄膜１８，１９
は非透過性であるので、ボールジヨイント内への
水の侵入およびダストカバー内に封入されている
グリース等の潤滑剤の外部への流出を防ぐ。薄膜
１８，１９はカバー本体１１の表面全体を被覆し
ているので、仮に外周面１７側の薄膜１９が破損
したとしても、残つた内周面１６側の薄膜１８に
よりボールジヨイント内への水の侵入を防ぐこと
ができる。 Since the cover body 11 is made of urethane foam with a high foaming rate, it allows water and lubricants such as grease to pass through, but the thin films 18 and 19 formed as described above
Since it is non-permeable, it prevents water from entering the ball joint and lubricant such as grease sealed in the dust cover from flowing out. Since the thin films 18 and 19 cover the entire surface of the cover body 11, even if the thin film 19 on the outer peripheral surface 17 side is damaged, the remaining thin film 18 on the inner peripheral surface 16 side will prevent water from entering the ball joint. can prevent intrusion.
また、ボールスタツド２が傾動した場合、カバ
ー本体は高い発泡率の発泡ウレタン製であるた
め、変形抵抗が極めて低いので、ダストカバー１
０はボールスタツドの作動に柔軟に追従する。ダ
ストカバー１０のこの変形によつてその内周面同
志または外周面同志が接触しても、薄膜１８，１
９は耐摩耗性が高いのでダストカバー１０が破損
することはない。 In addition, when the ball stud 2 tilts, the cover body is made of urethane foam with a high foaming rate, so the deformation resistance is extremely low.
0 flexibly follows the movement of the ball stud. Even if the inner circumferential surfaces or outer circumferential surfaces of the dust cover 10 come into contact with each other due to this deformation, the thin films 18 and 1
Since the dust cover 9 has high wear resistance, the dust cover 10 will not be damaged.
上記実施例においては、ダストカバーの開口部
がボールスタツドおよびソケツトに対して未固定
であるが、サークリツプ等の締付金具により固定
するタイプのダストカバーでもよい。 In the above embodiment, the opening of the dust cover is not fixed to the ball stud and socket, but the dust cover may be of a type that is fixed with a fastening fitting such as a circlip.
効 果
以上のように本考案によれば、カバー本体内外
周面に被覆したウレタン樹脂の薄膜は、非透過性
であるので、水のボールジヨイント内への侵入お
よびグリース等の潤滑剤の外部への流出がない、
と共にダストカバー外部からの衝撃により仮にカ
バー本体の外周面側の薄膜が破損したとしても、
残つた内周面側の薄膜によつてダストカバー内へ
の水の侵入が防止される。また、ウレタン樹脂の
薄膜は、発泡ウレタンに較べて摩擦に対する強度
が高いので、ダストカバーの内周面同志または外
周面同志が接触しても容易に破損することはない
ので、カバー本体を高い発泡率で発泡形成した発
泡ウレタン製ダストカバーにおいて、低い変形抵
抗を損なうことなく、確実なシール性を長期間保
つことができ、またシール機能自体を失うことが
ない。Effects As described above, according to the present invention, the thin film of urethane resin coated on the inner and outer peripheral surfaces of the cover body is non-permeable, which prevents water from entering the ball joint and lubricants such as grease from entering the ball joint. There is no leakage to
Also, even if the thin film on the outer circumferential surface of the dust cover is damaged due to an impact from outside the dust cover,
The remaining thin film on the inner peripheral surface side prevents water from entering the dust cover. In addition, the thin film of urethane resin has higher resistance to friction than foamed urethane, so even if the inner or outer surfaces of the dust cover come into contact, it will not be easily damaged. A dust cover made of urethane foam formed by foaming at a high temperature can maintain reliable sealing performance for a long period of time without sacrificing its low deformation resistance, and does not lose its sealing function itself.
第１図は本考案の実施例を表わすもので、ダス
トカバーを装着したボールジヨイントの断面平面
図である。
記号の説明、１１……カバー本体、１６……内
周面、１７……外周面、１８，１９……薄膜。
FIG. 1 shows an embodiment of the present invention, and is a sectional plan view of a ball joint equipped with a dust cover. Explanation of symbols, 11... Cover body, 16... Inner peripheral surface, 17... Outer peripheral surface, 18, 19... Thin film.
Claims (1)
周面１６，１７を、該カバー本体１１と発泡率の
異なるウレタン樹脂の薄膜１８，１９にて別途被
覆したダストカバーにおいて、前記カバー本体１
１の発泡率を前記薄膜の発泡率より高くしたこと
を特徴とするダストカバー。 In a dust cover in which the inner and outer circumferential surfaces 16 and 17 of a cylindrical urethane foam cover body 11 are separately coated with thin films 18 and 19 of urethane resin having a different foaming rate from that of the cover body 11, the cover body 1
A dust cover characterized in that the foaming rate of No. 1 is higher than that of the thin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16300486U JPH0446150Y2 (en) | 1986-10-24 | 1986-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16300486U JPH0446150Y2 (en) | 1986-10-24 | 1986-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6368569U JPS6368569U (en) | 1988-05-09 |
| JPH0446150Y2 true JPH0446150Y2 (en) | 1992-10-29 |
Family
ID=31090806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16300486U Expired JPH0446150Y2 (en) | 1986-10-24 | 1986-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0446150Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2529036Y2 (en) * | 1990-09-04 | 1997-03-12 | エヌオーケー株式会社 | Dust cover |
| JP4953865B2 (en) * | 2007-03-14 | 2012-06-13 | Ｔｈｋ株式会社 | Ball joint |
| JP5302647B2 (en) * | 2008-12-09 | 2013-10-02 | 東海ゴム工業株式会社 | Covering material for connecting parts |
-
1986
- 1986-10-24 JP JP16300486U patent/JPH0446150Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6368569U (en) | 1988-05-09 |
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