JPH0446125Y2 - - Google Patents
Info
- Publication number
- JPH0446125Y2 JPH0446125Y2 JP1985193432U JP19343285U JPH0446125Y2 JP H0446125 Y2 JPH0446125 Y2 JP H0446125Y2 JP 1985193432 U JP1985193432 U JP 1985193432U JP 19343285 U JP19343285 U JP 19343285U JP H0446125 Y2 JPH0446125 Y2 JP H0446125Y2
- Authority
- JP
- Japan
- Prior art keywords
- scraper
- shaft
- seal
- oil
- elastic member
- 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 description 3
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
この考案は往復動する軸部とハウジングとの間
を密封するオイルシールに関するものである。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an oil seal that seals between a reciprocating shaft portion and a housing.
（従来の技術）
従来この種のオイルシール、例えばラツクアン
ドピニオン方式のパワーステアリングのオイルシ
ール部分に使用されるオイルシールａは、第３図
に示すように、ハウジングｂと往復動するラツク
軸部ｃとの間に装着され、弾性部材ｄの外周シー
ル部ｅが上記ハウジングｂとの間を密封するとと
もに、内周シール部ｆが上記ラツク軸部ｃとの間
を密封するようにされている。(Prior Art) Conventionally, this type of oil seal, for example, an oil seal a used in the oil seal portion of a rack-and-pinion power steering system, has a rack shaft portion that reciprocates with a housing b, as shown in FIG. c, and the outer circumferential seal part e of the elastic member d seals between the housing b and the inner circumferential seal part f seals between the rack shaft part c. .
ところで、上記内周シール部ｆはくさび形状断
面のリツプｇを有し、これが上記ラツク軸部ｃの
外周面に摺接して、この部位にあまり大きな摺動
抵抗が生じないようにされている。ｈは芯金、ｉ
はバツクアツプリング、ｊは締付ばねである。 By the way, the inner circumferential seal part f has a lip g with a wedge-shaped cross section, and this is in sliding contact with the outer circumferential surface of the rack shaft part c, so that very large sliding resistance is not generated at this part. h is core metal, i
is a back-up spring, and j is a tightening spring.
（考案が解決しようとする問題点）
しかしながら、このような構造では以下に述べ
るような問題があり、その改良が要望されてい
た。(Problems to be Solved by the Invention) However, such a structure has the following problems, and improvements have been desired.
すなわち、パワーステアリングの使用中には経
時的にギアの摩耗粉等が生じるが、上記構造はこ
れら摩耗粉等の異物の侵入を積極的に防止する機
能を備えておらず、また上記リツプｇとラツク軸
部ｃとの摺接部の接触面積がきわめて小さい。こ
れがため、ラツク軸部ｃの矢符Ａ，Ｂ方向への往
復動作時に、これらの異物が上記摺接部にかみ込
んだり、あるいはこの摺接部を介して油中に混入
することになる。そして、上記摺接部にかみ込ん
だ異物がラツク軸部ｃの往復動作に伴つて上記リ
ツプｇを傷つけて損傷の原因となつたり、油もれ
の原因となつたり、あるいは油の早期交換を余儀
なくされていた。 In other words, gear wear particles are generated over time during power steering use, but the structure described above does not have a function to actively prevent foreign matter such as these wear particles from entering. The contact area of the sliding portion with the rack shaft portion c is extremely small. For this reason, when the rack shaft c reciprocates in the directions of arrows A and B, these foreign substances get caught in the sliding contact part or get mixed into the oil through this sliding contact part. Foreign matter caught in the sliding contact portion may damage the lip g as the rack shaft c reciprocates, causing damage, causing oil leakage, or requiring early oil replacement. I was forced to do it.
（問題点を解決するための手段）
本考案はかかる従来の問題点に鑑みてなされた
ものであつて、本考案のオイルシールは、弾性部
材の内周シール部の軸方向外側に、プラスチツク
材料からなる異物侵入防止用のスクレーパが設け
られ、該スクレーパの軸穴は、その内径が密封す
べき往復動軸部の外径よりも若干小さく設定され
て、該軸部に摺接可能とされ、前記スクレーパの
複数個所に、摺動抵抗減少用のスリツトが前記軸
穴に臨んで設けられ、前記スクレーパの適当個所
に、空気流通孔が複数個設けられていることを特
徴とする。(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and the oil seal of the present invention has a plastic material on the axially outer side of the inner peripheral seal portion of the elastic member. A scraper for preventing intrusion of foreign matter is provided, and the inner diameter of the scraper is set to be slightly smaller than the outer diameter of the reciprocating shaft to be sealed, so that the scraper can come into sliding contact with the shaft, The scraper is characterized in that slits for reducing sliding resistance are provided at a plurality of locations facing the shaft hole, and a plurality of air circulation holes are provided at appropriate locations on the scraper.
（作用）
弾性部材の内周シール部の軸方向外側に設けた
スクレーパは、経時的に発生したギアの摩耗粉等
の異物が侵入するのを防止して、該異物による上
記内周シール部のリツプの損傷や油もれ、あるい
は油中への異物の混入を防止する。(Function) The scraper provided on the axially outer side of the inner seal of the elastic member prevents foreign matter such as wear particles of gears generated over time from entering, and prevents the foreign matter from damaging the inner seal. Prevents lip damage, oil leakage, and foreign matter from entering the oil.
（実施例）
以下、本考案の実施例を図面に基いて説明す
る。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
本考案に係る往復動用オイルシールを用いたシ
ール構造を第１図に示し、該シール構造は具体的
にはラツクアンドピニオン方式のパワーステアリ
ングにおけるラツク軸部１とハウジング２とのオ
イルシール部分のものであつて、該ハウジング２
の一部分に上記ラツク軸部１を内外に挿通させる
軸穴２ａが設けられ、該軸穴２ａとラツク軸部１
との間部分にオイルシール３が装着されている。 A seal structure using a reciprocating oil seal according to the present invention is shown in FIG. 1, and this seal structure is specifically for an oil seal portion between a rack shaft portion 1 and a housing 2 in a rack-and-pinion power steering system. and the housing 2
A shaft hole 2a through which the rack shaft portion 1 is inserted inside and outside is provided in a part, and the shaft hole 2a and the rack shaft portion 1 are connected to each other.
An oil seal 3 is installed between the two.
オイルシール３は、金属製の芯金４およびバツ
クアツプリング５とゴム製の弾性部材６とが加流
接着されてなる環状のもので、異物侵入防止用の
スクレーパ７および締付ばね８を備えている。 The oil seal 3 is an annular member made of a metal core 4, a back-up spring 5, and a rubber elastic member 6 bonded together by hot-flow bonding, and is equipped with a scraper 7 and a tightening spring 8 to prevent foreign matter from entering. ing.
上記芯金４は断面がＬ字型状に形成されるとと
もに上記弾性部材６は断面が芯金４に沿う略コ字
形状に形成され、該弾性部材６の内周部分に上記
バツクアツプリング５が設けられている。また、
上記弾性部材６は外周シール部９と内周シール部
１０とを備え、該内周シール部１０のリツプ１１
の外周部分に上記締付ばね８が嵌着されている。 The core metal 4 has an L-shaped cross section, and the elastic member 6 has a substantially U-shaped cross section along the core metal 4. is provided. Also,
The elastic member 6 includes an outer seal portion 9 and an inner seal portion 10, and a lip 11 of the inner seal portion 10.
The above-mentioned tightening spring 8 is fitted onto the outer periphery of the .
スクレーパ７はプラスチツク材料からなる薄肉
の環状のもので、スクレーパ本体１２と取付部１
３とが一体成形されてなる。該取付部１３は上記
弾性部材６の取付内径面１４に対応した円筒状と
され、その基端部には膨出した環状の段部１３ａ
が形成されている。また、これに対応して、上記
取付内径面１４の軸方向内側端部には嵌合溝１４
ａが全周にわたつて形成されている。そして、該
嵌合溝１４ａに上記段部１３ａが嵌着固定される
とともに、上記取付内径面１４に取付部１３の外
径面１３ｂが密着状に嵌合されて、スクレーパ７
が弾性部材６に取り付けられている。 The scraper 7 is a thin ring-shaped thing made of plastic material, and includes a scraper body 12 and a mounting part 1.
3 are integrally molded. The mounting portion 13 has a cylindrical shape corresponding to the mounting inner diameter surface 14 of the elastic member 6, and has a bulging annular step portion 13a at its base end.
is formed. Correspondingly, a fitting groove 14 is provided at the axially inner end of the mounting inner diameter surface 14.
A is formed all around the circumference. Then, the stepped portion 13a is fitted and fixed into the fitting groove 14a, and the outer diameter surface 13b of the mounting portion 13 is tightly fitted into the inner diameter surface 14 of the mounting, so that the scraper 7
is attached to the elastic member 6.
スクレーパ本体１２は上記ラツク軸部１を挿通
する軸穴１５を有し、該軸穴１５は互いに反対方
向へ傾斜した２つの内径面１５ａ，１５ｂを有し
て、その断面がくさび形状に形成されている。軸
穴１５の最小径部つまり上記両径面１５ａ，１５
ｂの交差部１５ｃは、上記弾性部材６のリツプ１
１と同様に、上記ラツク軸部１の外径よりも若干
小さい径寸法とされて、該ラツク軸部１の外周面
に摺接可能とされている。 The scraper main body 12 has a shaft hole 15 through which the rack shaft portion 1 is inserted, and the shaft hole 15 has two inner diameter surfaces 15a and 15b that are inclined in opposite directions, and the cross section thereof is formed into a wedge shape. ing. The minimum diameter portion of the shaft hole 15, that is, the above-mentioned both diameter surfaces 15a, 15
The intersection portion 15c of the elastic member 6
1, the diameter is slightly smaller than the outer diameter of the rack shaft 1, so that it can come into sliding contact with the outer peripheral surface of the rack shaft 1.
また、上記スクレーパ本体１２には摺動抵抗減
少用のスリツト１６が周方向へ所定間隔をもつて
複数設けられている。該スリツト１６は、第２図
に示すように、スクレーパ本体１２の半径方向に
延びて形成され、その内端が軸穴１５に臨んでい
る。これにより、該軸穴１５はその径寸法が増減
可能とされ、上記ラツク軸部１が矢符Ａ，Ｂ方向
へ往復動作するに際しては、該ラツク軸部１の外
周面に弾発的に摺接するとともに、その摺動抵抗
が最小限に抑えられるようになされている。 Further, the scraper main body 12 is provided with a plurality of slits 16 for reducing sliding resistance at predetermined intervals in the circumferential direction. As shown in FIG. 2, the slit 16 is formed to extend in the radial direction of the scraper body 12, and its inner end faces the shaft hole 15. As a result, the diameter of the shaft hole 15 can be increased or decreased, and when the rack shaft 1 reciprocates in the directions of arrows A and B, it slides elastically on the outer peripheral surface of the rack shaft 1. The sliding resistance is minimized.
また、上記スリツト１６の外端部には空気流通
孔１７が連続状に設けられている。該空気流通孔
１７はスクレーパ７の内側と外側とを連通して、
内側と外側に圧力差が生じるのを防止するための
もので、その径寸法は上記目的およびスクレーパ
７の形状寸法等を考慮して設定される。また、上
記空気流通孔１７は必ずしもすべてのスリツト１
６に対応して設ける必要はなく、また該スリツト
１６と別個独立に設けてもよく、これらスリツト
１６の配設数や配設個所は上記径寸法に対応して
設定される。 Furthermore, air circulation holes 17 are continuously provided at the outer end of the slit 16. The air circulation hole 17 communicates the inside and outside of the scraper 7,
This is to prevent a pressure difference from occurring between the inside and the outside, and its diameter is set in consideration of the above purpose and the shape and size of the scraper 7. Furthermore, the air circulation holes 17 are not necessarily provided in all the slits 1.
6, and may be provided separately from the slits 16, and the number and locations of these slits 16 are set in accordance with the above-mentioned diameter dimension.
しかして、以上の構成により、ラツク軸部１が
矢符Ａ，Ｂ方向へ往復動作すると、弾性部材６の
外周シール部９がハウジング２との間の密封作用
をなすとともに、内周シール部１０のリツプ１１
が上記ラツク軸部１の外周面に摺接して、該ラツ
ク軸部１との間の密封作用をなし、ラツク軸部１
とハウジング２との間のオイルシールが確保され
る。一方、スクレーパ７は、スクレーパ本体１２
がラツク軸部１の外周面に摺接して、パワーステ
アリングの使用により経時的に生じたギアの摩耗
粉等の異物が軸方向内側（矢符Ｂ方向）へ侵入す
るのを防止して、該異物が上記リツプ１１とラツ
ク軸１との間の摺接部にかみ込んだり、あるいは
この摺接部を介して油中に混入するのを防ぐ。 With the above configuration, when the rack shaft portion 1 reciprocates in the directions of arrows A and B, the outer seal portion 9 of the elastic member 6 performs a sealing action with the housing 2, and the inner seal portion 10 Lip 11
is in sliding contact with the outer circumferential surface of the rack shaft 1 to perform a sealing action between the rack shaft 1 and the rack shaft 1.
An oil seal between the housing 2 and the housing 2 is ensured. On the other hand, the scraper 7 has a scraper main body 12
is in sliding contact with the outer circumferential surface of the easy shaft portion 1, and prevents foreign matter such as gear wear particles generated over time due to the use of power steering from entering inward in the axial direction (in the direction of arrow B). This prevents foreign matter from getting caught in the sliding contact between the lip 11 and the rack shaft 1, or from entering the oil through this sliding contact.
この場合において、上記摺接部の摺動抵抗はス
リツト１６…の作用により最小限に抑えられると
ともに、スクレーパ７の内外は空気流通孔１７…
により連通されて、圧力差が生ずるのを有効に防
止される。 In this case, the sliding resistance of the sliding contact portion is minimized by the action of the slits 16, and the air circulation holes 17 are located inside and outside the scraper 7.
This effectively prevents pressure differences from occurring.
なお、本考案は図示例のようにラツクアンドピ
ニオン方式のパワーステアリングのほか、他の同
様の構造を有するオイルシール部すなわち往復動
する軸部とハウジングとの間のオイルシール部に
も適用することができる。 Note that the present invention can be applied not only to rack-and-pinion type power steering as shown in the illustrated example, but also to other oil seal parts having a similar structure, that is, oil seal parts between the reciprocating shaft part and the housing. I can do it.
（考案の効果）
以上詳述したように、本考案によれば、以下に
列挙するような種々のすぐれた効果が得られる。(Effects of the invention) As detailed above, according to the present invention, various excellent effects as listed below can be obtained.
(1) 弾性部材の内周シール部の軸方向外側に、異
物の侵入を積極的に防止するスクレーパが設け
られているから、オイルシールの外部に生じた
ギアの摩耗粉等の異物が上記内周シール部のリ
ツプと往復動軸部との摺接部にかみ込んだり、
ここを介してオイルシールの内部の油中に混入
するのを防止することができ、上記リツプの損
傷や油もれ、あるいは油の汚れなどが防止され
る。(1) Since a scraper is provided on the axially outer side of the inner peripheral seal of the elastic member to actively prevent foreign matter from entering, foreign matter such as gear abrasion powder generated outside the oil seal is removed from the inside. It may get caught in the sliding contact between the lip of the peripheral seal and the reciprocating shaft, or
Through this, it is possible to prevent the oil from entering the oil inside the oil seal, thereby preventing damage to the lip, oil leakage, and oil stains.
(2) スクレーパの軸穴の内径が、密封すべき往復
動軸部の外径よりも若干小さく設定されるとと
もに、該軸穴に臨む摺動抵抗減少用スリツト
が、スクレーパの複数個所に設けられているか
ら、スクレーパの軸穴は、上記往復動軸部が往
復動作するに際して、該軸部の外周面に弾発的
に摺接するとともに、その摺動抵抗が最小限に
抑えられる。(2) The inner diameter of the shaft hole of the scraper is set to be slightly smaller than the outer diameter of the reciprocating shaft to be sealed, and slits facing the shaft hole to reduce sliding resistance are provided at multiple locations on the scraper. Therefore, when the reciprocating shaft section reciprocates, the shaft hole of the scraper resiliently slides into contact with the outer circumferential surface of the shaft section, and the sliding resistance thereof is minimized.
(3) スクレーパの適当個所に、空気流通孔が複数
個設けられて、スクレーパの内側と外側が連通
されているから、スクレーパ内外に圧力差の生
ずるのが有効に防止される。(3) Since a plurality of air circulation holes are provided at appropriate locations on the scraper and the inside and outside of the scraper are communicated with each other, pressure differences between the inside and outside of the scraper can be effectively prevented.
第１図は本考案の一実施例であるオイルシール
を示す側面縦断面図、第２図は同シールのスクレ
ーパの一部を示す第１図の−線に沿つた正面
図、第３図は従来のオイルシールを示す第１図に
対応した図である。
１……ラツク軸部（往復動軸部）、２……ハウ
ジング、３……オイルシール、６……弾性部材、
７……スクレーパ、１０……内周シール部、１１
……リツプ、１５……軸穴、１６……スリツト、
１７……空気流通孔。
Fig. 1 is a side longitudinal sectional view showing an oil seal that is an embodiment of the present invention, Fig. 2 is a front view taken along the - line in Fig. 1 showing a part of the scraper of the seal, and Fig. 3 is a side view showing an oil seal as an embodiment of the present invention. FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional oil seal. 1...Rack shaft part (reciprocating shaft part), 2...Housing, 3...Oil seal, 6...Elastic member,
7... Scraper, 10... Inner seal portion, 11
...Rip, 15...Shaft hole, 16...Slit,
17...Air circulation hole.
Claims (1)
スチツク材料からなる異物侵入防止用のスクレー
パが設けられ、 該スクレーパの軸穴は、その内径が密封すべき
往復動軸部の外径よりも若干小さく設定されて、
該軸部に摺接可能とされ、 前記スクレーパの複数個所に、摺動抵抗減少用
のスリツトが前記軸穴に臨んで設けられ、 前記スクレーパの適当個所に、空気流通孔が複
数個設けられている ことを特徴とする往復動用オイルシール。[Scope of Claim for Utility Model Registration] A scraper made of plastic material to prevent foreign matter from entering is provided on the axially outer side of the inner circumferential seal portion of the elastic member, and the shaft hole of the scraper has a reciprocating motion whose inner diameter is to be sealed. It is set slightly smaller than the outer diameter of the shaft,
The scraper is capable of sliding contact with the shaft, slits for reducing sliding resistance are provided at a plurality of locations on the scraper facing the shaft hole, and a plurality of air circulation holes are provided at appropriate locations on the scraper. A reciprocating oil seal characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985193432U JPH0446125Y2 (en) | 1985-12-16 | 1985-12-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985193432U JPH0446125Y2 (en) | 1985-12-16 | 1985-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62100372U JPS62100372U (en) | 1987-06-26 |
| JPH0446125Y2 true JPH0446125Y2 (en) | 1992-10-29 |
Family
ID=31149447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985193432U Expired JPH0446125Y2 (en) | 1985-12-16 | 1985-12-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0446125Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4205862C1 (en) * | 1992-02-26 | 1993-06-17 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
| JP5221398B2 (en) * | 2009-01-08 | 2013-06-26 | 株式会社東芝 | Steam valve device and power generation equipment provided with the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548902U (en) * | 1978-09-27 | 1980-03-31 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54118556U (en) * | 1978-02-07 | 1979-08-20 |
-
1985
- 1985-12-16 JP JP1985193432U patent/JPH0446125Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548902U (en) * | 1978-09-27 | 1980-03-31 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62100372U (en) | 1987-06-26 |
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