JPH09112704A - Oil seal - Google Patents

Oil seal

Info

Publication number
JPH09112704A
JPH09112704A JP7295952A JP29595295A JPH09112704A JP H09112704 A JPH09112704 A JP H09112704A JP 7295952 A JP7295952 A JP 7295952A JP 29595295 A JP29595295 A JP 29595295A JP H09112704 A JPH09112704 A JP H09112704A
Authority
JP
Japan
Prior art keywords
shaft
bumper
seal lip
oil seal
section
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.)
Pending
Application number
JP7295952A
Other languages
Japanese (ja)
Inventor
Kenichi Yarimizu
健一 鎗水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nok Corp
Original Assignee
Nok Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nok Corp filed Critical Nok Corp
Priority to JP7295952A priority Critical patent/JPH09112704A/en
Publication of JPH09112704A publication Critical patent/JPH09112704A/en
Pending legal-status Critical Current

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  • Sealing With Elastic Sealing Lips (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a clearance between a seal lip and a shaft even if the shaft causes large eccentricity, provide excellent sealing performance, prevent contact force of a bumper to the shaft from becoming too large, and provide excellent durability performance. SOLUTION: As for an oil seal in which a bellows like flexible section 2 is provided on an inner peripheral side of an outer peripheral mounting section 1 and a bumper 3 and a seal lip 4 are provided on an inner peripheral side of the flexible section 2, the shape of a cross section of the flexible section 2 is substantially formed into a W-shape, and it has the length by which the flexible section 2 on a pull-out side is extended sufficiently when a shaft 5 causes large eccentricity and reduces the degree of pulling out from a compression side.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、密封装置の一種で
あるオイルシールに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal which is a kind of a sealing device.

【0002】[0002]

【従来の技術】図3に示すように、自動車等のステアリ
ングに用いられるダスト用のオイルシール(ダストシー
ル)は、従来、外周取付部1の内周側にベロー状の可撓
部2を一体成形し、可撓部2の内周側にバンパー3を一
体成形し、バンパー3の軸方向一端側(図上上側)に、
軸5に摺動自在に密接するシールリップ4を一体成形し
ている。
2. Description of the Related Art As shown in FIG. 3, an oil seal (dust seal) for dust used in steering of an automobile or the like is conventionally integrally formed with a bellows-shaped flexible portion 2 on an inner peripheral side of an outer peripheral mounting portion 1. Then, the bumper 3 is integrally formed on the inner peripheral side of the flexible portion 2, and one end side (upper side in the figure) of the bumper 3 in the axial direction is
A seal lip 4 that slidably comes into close contact with the shaft 5 is integrally formed.

【0003】しかしながら上記従来のオイルシールにお
いては、可撓部2の断面形状が略v字形とされていて、
その長さが短いために、以下の問題がある。
However, in the above-mentioned conventional oil seal, the cross-sectional shape of the flexible portion 2 is substantially v-shaped,
Due to its short length, there are the following problems.

【0004】すなわち、図3に示したように、軸5が大
きく偏心した際に、バンパー3およびシールリップ4が
円周上の一部において軸方向に移動(矢印x)して軸5
に対して大きく傾き、この結果、シールリップ4の軸5
に対する接触状態が大きく変化するために、図4(B)
に示すように、シールリップ4と軸5との間に円周上の
一部において隙間6が発生し、この隙間6から漏れが発
生する問題がある。またこの隙間6が発生する位置に対
して略180度変位した位置では、バンパー3の軸5に
対する接触力が大きくなり過るために、バンパー3が早
期に摩耗する問題がある。
That is, as shown in FIG. 3, when the shaft 5 is largely eccentric, the bumper 3 and the seal lip 4 move axially (arrow x) in a part of the circumference, and the shaft 5 moves.
With a large inclination to the shaft 5 of the seal lip 4.
4 (B) because the contact state with respect to
As shown in FIG. 3, there is a problem that a gap 6 is generated in a part of the circumference between the seal lip 4 and the shaft 5, and a leak is generated from the gap 6. Further, at a position displaced by approximately 180 degrees with respect to the position where the gap 6 is generated, the contact force of the bumper 3 with respect to the shaft 5 becomes excessively large, which causes a problem that the bumper 3 is worn early.

【0005】[0005]

【発明が解決しようとする課題】本発明は以上の点に鑑
み、軸が大きく偏心してもシールリップと軸との間に隙
間が発生することがなく、もって優れた密封性能を発揮
するとともに、バンパーの軸に対する接触力が大きくな
り過ぎることがなく、もって優れた耐久性能を発揮する
ことが可能なオイルシールを提供することを目的とす
る。
In view of the above points, the present invention provides excellent sealing performance without causing a gap between the seal lip and the shaft even when the shaft is largely eccentric. An object of the present invention is to provide an oil seal capable of exhibiting excellent durability performance without the contact force of the bumper on the shaft becoming too large.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、本発明のオイルシールは、外周取付部の内周側にベ
ロー状の可撓部を設け、前記可撓部の内周側にバンパー
およびシールリップを設けたオイルシールにおいて、前
記可撓部の断面形状を略w字形とすることにした。
In order to achieve the above object, an oil seal of the present invention is provided with a bellows-shaped flexible portion on the inner peripheral side of an outer peripheral mounting portion and a bumper on the inner peripheral side of the flexible portion. Further, in the oil seal provided with the seal lip, the flexible portion has a substantially w-shaped cross-section.

【0007】[0007]

【作用】上記構成を備えた本発明のオイルシールのよう
に、可撓部の断面形状が略w字形とされていると、軸が
大きく偏心した際に、引張り側の可撓部が十分に伸ばさ
れる長さを有しており、また圧縮側からの引張りが少な
くなるために、バンパーおよびシールリップが軸方向に
移動しにくくなる。したがってシールリップの軸に対す
る接触状態が大きく変化することがないために、シール
リップと軸との間に隙間が発生するのを防止するととも
に、バンパーの軸に対する接触力が大きくなり過ぎるの
を防止することが可能となる。
When the flexible portion has a substantially w-shaped cross section like the oil seal of the present invention having the above-mentioned structure, when the shaft is largely eccentric, the flexible portion on the pulling side is sufficiently formed. Since it has a length to be extended and the tension from the compression side is reduced, the bumper and the seal lip are hard to move in the axial direction. Therefore, since the contact state of the seal lip with respect to the shaft does not change significantly, it is possible to prevent a gap from being generated between the seal lip and the shaft and prevent the contact force of the bumper against the shaft from becoming too large. It becomes possible.

【0008】[0008]

【発明の実施の形態】可撓部の断面形状を略v字形から
略w字形に変更したことは、その形状の相違からして一
重ベローを二重ベローに変更したと換言することがで
き、また一般論からして、その長さを長くしたと言うこ
とができる。wの向きは、軸方向の何れであっても良
い。
BEST MODE FOR CARRYING OUT THE INVENTION Changing the cross-sectional shape of a flexible portion from a substantially v-shape to a substantially w-shape can be rephrased as changing a single bellows to a double bellow due to the difference in shape. From the general theory, it can be said that the length is increased. The direction of w may be either the axial direction.

【0009】[0009]

【実施例】つぎに本発明の実施例を図面にしたがって説
明する。
Next, an embodiment of the present invention will be described with reference to the drawings.

【0010】図1は当該実施例に係るオイルシールの半
裁断面を示しており、このオイルシールは、エンジンル
ーム(車外)から車内へ泥水等が侵入することがないよ
うにこれを防止するステアリング用のダストシールとし
て用いられる。
FIG. 1 shows a half-cut cross section of an oil seal according to this embodiment. This oil seal is for steering that prevents muddy water from entering the vehicle from the engine room (outside the vehicle). It is used as a dust seal.

【0011】ゴムまたは樹脂等のゴム状弾性材(高分子
材料)によって成形された環状の外周取付部1の内周側
にベロー状の可撓部(ベロー部とも称する)2が一体成
形されており、この可撓部2の内周側に環状のバンパー
3が一体成形され、このバンパー3の軸方向一端側(図
上上側)に、軸5に摺動自在に密接する環状のシールリ
ップ(第一のシールリップまたはメインリップとも称す
る)4が一体成形され、このシールリップ4の外周面に
設けられた環状の装着溝4aにガータスプリング7が嵌
着され、シールリップ4の軸方向一端側、すなわち先端
側に、軸5に摺動自在に密接する環状の第二のシールリ
ップ8が一体成形され、バンパー3に保形リング9が埋
設され、可撓部2の半裁断面形状が略w字形に成形され
ている。
A bellows-shaped flexible portion (also referred to as a bellows portion) 2 is integrally formed on the inner peripheral side of an annular outer peripheral mounting portion 1 formed of a rubber-like elastic material (polymer material) such as rubber or resin. An annular bumper 3 is integrally formed on the inner peripheral side of the flexible portion 2, and an annular seal lip (on the upper side in the figure) of the bumper 3 in the axial direction slidably closes to the shaft 5 ( A first seal lip or a main lip) 4 is integrally formed, and a garter spring 7 is fitted into an annular mounting groove 4a provided on the outer peripheral surface of the seal lip 4, and one end side in the axial direction of the seal lip 4 That is, on the tip side, an annular second seal lip 8 slidably in contact with the shaft 5 is integrally molded, a shape-retaining ring 9 is embedded in the bumper 3, and the semi-section shape of the flexible portion 2 is substantially w. It is shaped like a letter.

【0012】すなわち、方向としてバンパー3の軸方向
一端側にシールリップ4が一体成形されていることを前
提として、外周取付部1から軸方向他端側(図上下側)
に向けて可撓部2が始まっており、この可撓部2が、軸
方向他端側に向けて延びた第一テーパ部2a、第一屈曲
部2b、軸方向一端側に向けて延びた第二テーパ部2
c、第二屈曲部2d、再度軸方向他端側に向けて延びた
第三テーパ部2e、第三屈曲部2f、再度軸方向一端側
に向けて延びた第四テーパ部2gをこの順番に一体に備
えており、第四テーパ部2gの軸方向一端側にバンパー
3が一体成形されている。
That is, assuming that the seal lip 4 is integrally formed on one end side in the axial direction of the bumper 3 as a direction, the other end side in the axial direction from the outer peripheral mounting portion 1 (upper and lower sides in the drawing).
The flexible portion 2 starts toward the first flexible portion 2 and the flexible portion 2 extends toward the other end side in the axial direction, the first tapered portion 2a, the first bent portion 2b, and one end side in the axial direction. Second taper part 2
c, the second bent portion 2d, the third tapered portion 2e extending again toward the other axial end, the third bent portion 2f, and the fourth tapered portion 2g extending again toward the one axial end in this order. The bumper 3 is integrally provided, and the bumper 3 is integrally formed on one end side in the axial direction of the fourth tapered portion 2g.

【0013】第二のシールリップ8は、シールリップ4
の先端部に連続して設けられた基端側円筒部8aと、こ
の基端側円筒部8aに連続して設けられた先窄まりのテ
ーパ部8bと、このテーパ部8bに連続して設けられた
先端側円筒部8cとを備え、かつ断面形状を略三角形に
形成された独自の軸5に対する摺動部8dを備えてお
り、またその自由状態における内径寸法がシールリップ
4の自由状態における内径寸法より小さく設定され、更
に図示したように、全体に薄く長く、軸5に対する締め
代が大きくなり過ぎないように成形されている。保形リ
ング9は金属等の剛材によって断面略矩形状に成形され
ており、またその外周面をバンパー3に対して表面露出
させている。外周取付部1には、金属等剛材製の補強環
10が埋設されている。
The second seal lip 8 is the seal lip 4
Of the base end side cylindrical portion 8a provided continuously to the tip end portion of the above, a tapered taper portion 8b provided continuously to the base end side cylindrical portion 8a, and provided continuously to the taper portion 8b. And a sliding portion 8d for the unique shaft 5 having a substantially triangular cross-section, and the inner diameter of the seal lip 4 in the free state. It is set smaller than the inner diameter dimension, and as shown in the drawing, it is thin and long as a whole, and is shaped so that the tightening margin for the shaft 5 does not become too large. The shape-retaining ring 9 is formed of a rigid material such as metal into a substantially rectangular cross section, and the outer peripheral surface of the shape-retaining ring 9 is exposed to the bumper 3. A reinforcing ring 10 made of a rigid material such as metal is embedded in the outer peripheral mounting portion 1.

【0014】上記構成を備えたオイルシールにおいて
は、可撓部2の断面形状が略w字形とされているため
に、軸5が大きく偏心した際に、引張り側の可撓部2が
十分に伸ばされる長さを有しており、また圧縮側からの
引張りが少なくなるために、バンパー3およびシールリ
ップ4が軸方向に移動しにくい。したがってシールリッ
プ4の軸5に対する接触状態が大きく変化することがな
いために、シールリップ4と軸5との間に隙間が発生す
るのを防止することができ、これによって密封性能を向
上させることができる。図2は、シールリップ4が軸方
向に移動しにくくなったことを実験の結果として示した
もので、グラフ上、当該実施例に係るオイルシールが
「□」プロットで示されている。「〇」プロットは、図
5に示した、可撓部2の断面形状を略v字形とした第一
比較例に係るオイルシール、「△」プロットは、図6に
示した、可撓部2の断面形状を略u字形とした第二比較
例に係るオイルシールである。尚、グラフの縦軸の「リ
ップ先端の軸方向距離」は、図3における距離xのこと
である。
In the oil seal having the above structure, since the flexible portion 2 has a substantially w-shaped cross section, when the shaft 5 is largely eccentric, the flexible portion 2 on the pulling side is sufficiently formed. The bumper 3 and the seal lip 4 are difficult to move in the axial direction because they have a length to be extended and the tension from the compression side is reduced. Therefore, since the contact state of the seal lip 4 with the shaft 5 does not change significantly, it is possible to prevent a gap from being generated between the seal lip 4 and the shaft 5, thereby improving the sealing performance. You can FIG. 2 shows, as a result of an experiment, that the seal lip 4 becomes difficult to move in the axial direction, and the oil seal according to the example is shown by a “□” plot on the graph. The “◯” plot is the oil seal according to the first comparative example in which the cross-sectional shape of the flexible portion 2 shown in FIG. 5 is substantially v-shaped, and the “Δ” plot is the flexible portion 2 shown in FIG. 6. Is an oil seal according to a second comparative example having a substantially u-shaped cross section. The "axial distance of the lip tip" on the vertical axis of the graph means the distance x in FIG.

【0015】また上記構成を備えたオイルシールにおい
ては、同じ理由から、バンパー3の軸5に対する接触力
が大きくなり過ぎるのを防止することができ、これによ
ってバンパー3が早期に摩耗するのを抑えて耐久性能を
向上させることができる。
Further, in the oil seal having the above-mentioned structure, for the same reason, it is possible to prevent the contact force of the bumper 3 with respect to the shaft 5 from becoming excessively large, thereby suppressing the early wear of the bumper 3. The durability performance can be improved.

【0016】[0016]

【発明の効果】本発明は、以下の効果を奏する。The present invention has the following effects.

【0017】すなわち、上記構成を備えた本発明のオイ
ルシールにおいては、可撓部の断面形状が略w字形とさ
れているために、軸が大きく偏心した際に、引張り側の
可撓部が十分に伸ばされる長さを有しており、また圧縮
側からの引張りが少なくなるために、バンパーおよびシ
ールリップが軸方向に移動しにくい。したがってシール
リップの軸に対する接触状態が大きく変化することがな
いために、シールリップと軸との間に隙間が発生するの
を防止することができ、これによって密封性能を向上さ
せることができる。また同じ理由から、バンパーの軸に
対する接触力が大きくなり過ぎるのを防止することがで
き、これによってバンパーが早期に摩耗するのを抑えて
耐久性能を向上させることができる。
That is, in the oil seal of the present invention having the above structure, since the flexible portion has a substantially w-shaped cross section, when the shaft is largely eccentric, the flexible portion on the pulling side is The bumper and the seal lip do not easily move in the axial direction because they have a sufficiently extended length and the tension from the compression side is reduced. Therefore, since the contact state of the seal lip with the shaft does not change significantly, it is possible to prevent a gap from being generated between the seal lip and the shaft, thereby improving the sealing performance. Further, for the same reason, it is possible to prevent the contact force of the bumper with respect to the shaft from becoming too large, and thus it is possible to suppress early wear of the bumper and improve the durability performance.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例に係るオイルシールの半裁断面
FIG. 1 is a half cutaway view of an oil seal according to an embodiment of the present invention.

【図2】軸の偏心量とシールリップ先端部の軸方向距離
の関係を示すグラフ図
FIG. 2 is a graph showing the relationship between the shaft eccentricity and the axial distance of the seal lip tip.

【図3】従来例に係るオイルシールの作動状態を示す断
面図
FIG. 3 is a cross-sectional view showing an operating state of an oil seal according to a conventional example.

【図4】(A)は図3におけるA部拡大図、(B)は図
3におけるB部拡大図
4A is an enlarged view of part A in FIG. 3, and FIG. 4B is an enlarged view of part B in FIG.

【図5】第一比較例に係るオイルシールの半裁断面図FIG. 5 is a half-cut sectional view of an oil seal according to a first comparative example.

【図6】第二比較例に係るオイルシールの半裁断面図FIG. 6 is a half cutaway view of an oil seal according to a second comparative example.

【符号の説明】[Explanation of symbols]

1 外周取付部 2 可撓部 2a,2c,2e,2g テーパ部 2b,2d,2f 屈曲部 3 バンパー 4 シールリップ 4a 装着溝 5 軸 6 隙間 7 ガータスプリング 8 第二のシールリップ 8a 基端側円筒部 8b テーパ部 8c 先端側円筒部 8d 摺動部 9 保形リング 10 補強環 1 Outer peripheral mounting portion 2 Flexible portion 2a, 2c, 2e, 2g Tapered portion 2b, 2d, 2f Bent portion 3 Bumper 4 Seal lip 4a Mounting groove 5 Shaft 6 Gap 7 Garter spring 8 Second seal lip 8a Base side cylinder Part 8b Tapered part 8c Tip side cylindrical part 8d Sliding part 9 Shape retention ring 10 Reinforcement ring

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 外周取付部(1)の内周側にベロー状の
可撓部(2)を設け、前記可撓部(2)の内周側にバン
パー(3)およびシールリップ(4)を設けたオイルシ
ールにおいて、前記可撓部(2)の断面形状を略w字形
としたことを特徴とするオイルシール。
1. A bellows-shaped flexible part (2) is provided on the inner peripheral side of the outer peripheral mounting part (1), and a bumper (3) and a seal lip (4) are provided on the inner peripheral side of the flexible part (2). In the oil seal provided with, the flexible part (2) has a substantially w-shaped cross section.
JP7295952A 1995-10-20 1995-10-20 Oil seal Pending JPH09112704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7295952A JPH09112704A (en) 1995-10-20 1995-10-20 Oil seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7295952A JPH09112704A (en) 1995-10-20 1995-10-20 Oil seal

Publications (1)

Publication Number Publication Date
JPH09112704A true JPH09112704A (en) 1997-05-02

Family

ID=17827233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7295952A Pending JPH09112704A (en) 1995-10-20 1995-10-20 Oil seal

Country Status (1)

Country Link
JP (1) JPH09112704A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6546738B2 (en) * 2001-07-24 2003-04-15 Sanyo Electric Co., Ltd. Stirling refrigerator
JP2006162014A (en) * 2004-12-10 2006-06-22 Nok Corp Sealing device
WO2009034871A1 (en) * 2007-09-14 2009-03-19 Eagle Industry Co., Ltd. Installation structure for lip type seal
JP2010216607A (en) * 2009-03-18 2010-09-30 Nok Corp Sealing device
JP2015014309A (en) * 2013-07-04 2015-01-22 光洋シーリングテクノ株式会社 Sealing device
US9163731B2 (en) 2008-05-15 2015-10-20 Eagle Industry Co., Ltd. Lip type seal
DE102019210136A1 (en) * 2019-07-10 2021-01-14 Zf Friedrichshafen Ag Radial shaft seal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6546738B2 (en) * 2001-07-24 2003-04-15 Sanyo Electric Co., Ltd. Stirling refrigerator
JP2006162014A (en) * 2004-12-10 2006-06-22 Nok Corp Sealing device
WO2009034871A1 (en) * 2007-09-14 2009-03-19 Eagle Industry Co., Ltd. Installation structure for lip type seal
US8011672B2 (en) 2007-09-14 2011-09-06 Eagle Industry Co., Ltd. Installation structure for lip type seal
KR101476599B1 (en) * 2007-09-14 2014-12-26 이글 고우교 가부시기가이샤 Installation structure for lip type seal
US9163731B2 (en) 2008-05-15 2015-10-20 Eagle Industry Co., Ltd. Lip type seal
JP2010216607A (en) * 2009-03-18 2010-09-30 Nok Corp Sealing device
JP2015014309A (en) * 2013-07-04 2015-01-22 光洋シーリングテクノ株式会社 Sealing device
DE102019210136A1 (en) * 2019-07-10 2021-01-14 Zf Friedrichshafen Ag Radial shaft seal

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