JPH09112706A - Oil seal - Google Patents
Oil sealInfo
- Publication number
- JPH09112706A JPH09112706A JP7295951A JP29595195A JPH09112706A JP H09112706 A JPH09112706 A JP H09112706A JP 7295951 A JP7295951 A JP 7295951A JP 29595195 A JP29595195 A JP 29595195A JP H09112706 A JPH09112706 A JP H09112706A
- Authority
- JP
- Japan
- Prior art keywords
- flexible portion
- oil seal
- flexible
- shaft
- inner peripheral
- 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
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Abstract
(57)【要約】
【課題】 ベロー状の可撓部１を備え、可撓部１の内周
側にバンパー２およびシールリップ３を設けたオイルシ
ールについて、軸を挿入する際に可撓部１が反転しにく
く、また反転しても反転前の状態に戻り易いオイルシー
ルを提供する。
【解決手段】 軸挿入方向に対する可撓部１の凹側１ｂ
を他の部分より厚肉にすることにし、また可撓部１の屈
曲部１ｐを軸挿入方向に対して反対側に設けることにし
た。
(57) Abstract: An oil seal having a bellows-shaped flexible part (1) and a bumper (2) and a seal lip (3) provided on the inner peripheral side of the flexible part (1) is flexible when inserting a shaft. 1 provides an oil seal that is difficult to reverse and that can easily return to the state before the reverse even when it is reversed. SOLUTION: The concave side 1b of the flexible portion 1 with respect to the shaft insertion direction.
Is made thicker than other portions, and the bent portion 1p of the flexible portion 1 is provided on the opposite side to the shaft insertion direction.
Description
【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５、図６または図７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、ベロー状の可撓部１を
備えており、この可撓部１の内周側にバンパー２を一体
成形し、バンパー２の軸方向一端側（図上上側）に、軸
（図示せず）に摺動自在に密接するシールリップ３を一
体成形している。図６および図７において、符号４は、
可撓部１の外周側に一体成形された外周取付部である。2. Description of the Related Art As shown in FIG. 5, FIG. 6, or FIG. 7, an oil seal (dust seal) for dust used in steering of an automobile or the like has conventionally been provided with a bellows-shaped flexible portion 1. A bumper 2 is integrally formed on the inner peripheral side of the flexible portion 1, and a seal lip 3 that is slidably in contact with a shaft (not shown) is integrally formed on one end side (upper side in the drawing) of the bumper 2 in the axial direction. ing. 6 and 7, the reference numeral 4 is
The outer peripheral mounting portion is integrally formed on the outer peripheral side of the flexible portion 1.
【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１が偏心追随性を向上させるべく薄く長
く成形されていて、その全長Ｌに亙って同一の厚さに成
形されているために、以下の問題がある。また可撓部１
の、略円弧形に曲げられた屈曲部１ａが軸挿入方向（軸
挿入方向を矢印で示している）側（図上上側）に設けら
れているために、同じく、以下の問題がある。However, in the above-mentioned conventional oil seal, the flexible portion 1 is formed thin and long in order to improve the eccentricity following property, and is formed to have the same thickness over the entire length L thereof. There are the following problems. In addition, the flexible portion 1
Since the bent portion 1a bent in a substantially arc shape is provided on the shaft insertion direction side (the shaft insertion direction is indicated by an arrow) (upper side in the drawing), the following problems also occur.
【０００４】すなわち、図８に示すように、軸５を挿入
する際に、可撓部１が反転してそのまま伸びきった状態
となるために、密封性能が不安定となり、最悪、軸５が
大きく偏心したときに可撓部１が破損する問題がある。That is, as shown in FIG. 8, when the shaft 5 is inserted, the flexible portion 1 is inverted and is in a fully extended state, so that the sealing performance becomes unstable, and in the worst case, the shaft 5 is rotated. There is a problem that the flexible part 1 is damaged when it is largely eccentric.
【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、軸を挿入する際に可撓部が反転しにくく、また反転
しても反転前の状態に戻り易いオイルシールを提供する
ことを目的とする。SUMMARY OF THE INVENTION In view of the above points, the present invention provides an oil seal in which the flexible portion is difficult to reverse when the shaft is inserted, and even if the flexible seal is reversed, the oil seal easily returns to the state before the reverse. With the goal.
【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、本発明の請求項１によるオイルシールは、ベロー状
の可撓部を備え、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、軸挿入方
向に対する前記可撓部の凹側を他の部分より厚肉にする
ことにした。In order to achieve the above object, an oil seal according to claim 1 of the present invention comprises a bellows-shaped flexible portion, and a bumper and a seal lip are provided on the inner peripheral side of the flexible portion. In the provided oil seal, the concave side of the flexible portion with respect to the shaft insertion direction is made thicker than other portions.
【０００７】また本発明の請求項２によるオイルシール
は、ベロー状の可撓部を備え、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、前記可撓部の屈曲部を軸挿入方向に対して反対側に
設けることにした。An oil seal according to a second aspect of the present invention is an oil seal having a bellows-shaped flexible portion and a bumper and a seal lip provided on the inner peripheral side of the flexible portion. The part is provided on the opposite side to the shaft insertion direction.
【０００８】[0008]
【作用】上記構成を備えた本発明の請求項１によるオイ
ルシールのように、軸挿入方向に対する可撓部の凹側が
他の部分より厚肉にされていると、可撓部の保形力（反
転前の状態（姿勢）を維持しようとする作用）が従来よ
り大きくなるために、軸を挿入する際に可撓部が反転し
にくくなり、また万一反転しても反転前の状態に戻り易
くなる。In the oil seal according to claim 1 of the present invention having the above structure, when the concave side of the flexible portion with respect to the shaft insertion direction is thicker than the other portions, the shape retaining force of the flexible portion is maintained. Since the action to maintain the state (posture) before reversing is larger than before, it becomes difficult for the flexible part to revert when inserting the shaft, and even if it is reversed, it will return to the state before reversing. It will be easier to return.
【０００９】また上記構成を備えた本発明の請求項２に
よるオイルシールのように、可撓部の屈曲部が軸挿入方
向に対して反対側に設けられていると、可撓部が初めか
ら反転後の状態（姿勢）に置かれたようになるために、
軸を挿入する際に可撓部が反転しにくくなる。Further, as in the oil seal according to claim 2 of the present invention having the above structure, when the bent portion of the flexible portion is provided on the side opposite to the axial insertion direction, the flexible portion is provided from the beginning. In order to be placed in the state (posture) after turning over,
The flexible portion is less likely to be inverted when the shaft is inserted.
【００１０】[0010]
【発明の実施の形態】本発明の請求項１によるオイルシ
ールにおいて、軸挿入方向に対する可撓部の凹側は、波
形を呈する可撓部の断面形状のうちの、軸を挿入する方
向から見て遠い方の波底部分であって、この部分を全周
に亙って他の部分より厚肉に成形するのが好適である。BEST MODE FOR CARRYING OUT THE INVENTION In the oil seal according to claim 1 of the present invention, the concave side of the flexible portion with respect to the shaft insertion direction is seen from the direction of inserting the shaft in the cross-sectional shape of the wavy flexible portion. It is preferable that the wave bottom portion on the far side is formed thicker than the other portions over the entire circumference.
【００１１】また本発明の請求項２によるオイルシール
において、軸挿入方向に対する反対側は、軸を挿入する
方向から見て遠い側であって、ここに初めから可撓部の
屈曲部が位置するように、可撓部ないし当該オイルシー
ルを成形する。屈曲部は、従来からそうであるように、
断面円弧形に成形するのが好適である。In the oil seal according to claim 2 of the present invention, the side opposite to the shaft insertion direction is the side farther from the shaft insertion direction, and the bending portion of the flexible portion is located from the beginning. As described above, the flexible portion or the oil seal is molded. The bent part, as it has been so far,
It is preferable to form it into an arc shape in cross section.
【００１２】[0012]
【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.
【００１３】第一実施例・・・図１に示すように、当該
実施例に係るオイルシールは、先ず、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ベロ
ー状の可撓部１を備えており、この可撓部１の内周側に
環状のバンパー２が一体成形され、このバンパー２の軸
方向一端側（図上上側）に、軸（図示せず）に摺動自在
に密接する環状のシールリップ３が一体成形され、この
シールリップ３の外周面に設けられた環状の装着溝３ａ
にガータスプリング６が嵌着され、所定の径方向長さＬ
を備えた可撓部１のうちの、矢示した軸挿入方向に対す
る凹側１ｂが他の部分より厚肉（ｔ1 ＞ｔ2 ）に成形さ
れている。First Embodiment: As shown in FIG. 1, the oil seal according to the first embodiment is a bellows-shaped elastic member formed of a rubber-like elastic material (polymer material) such as rubber or resin. A flexible portion 1 is provided, and an annular bumper 2 is integrally formed on the inner peripheral side of the flexible portion 1, and one end side (upper side in the figure) of the bumper 2 in the axial direction is slid on a shaft (not shown). An annular seal lip 3 that is movably in close contact is integrally molded, and an annular mounting groove 3a is provided on the outer peripheral surface of the seal lip 3.
The garter spring 6 is fitted to the predetermined radial length L
In the flexible portion 1 provided with, the concave side 1b with respect to the axial insertion direction shown by the arrow is formed thicker (t 1 > t 2 ) than other portions.
【００１４】すなわち、全体として環状に成形された可
撓部１は、その外周側から内周側へかけて、上記した凹
側１ｂと、この凹側１ｂの内周端部であってかつ軸方向
一端部（図上上端部）から軸方向一端側に向けて連続成
形された第一テーパ部１ｃと、この第一テーパ部１ｃの
軸方向一端部に連続成形された断面円弧形の屈曲部１ｄ
と、この屈曲部１ｄの内周端部に軸方向他端側（図上下
側）に向けて連続成形された第二テーパ部１ｅとを一体
に備えており、第二テーパ部１ｅの軸方向他端部（図上
下端部）にバンパー２が一体成形されている。したがっ
て当該実施例において、上記した他の部分は、第一テー
パ部１ｃ、屈曲部１ｄおよび第二テーパ部１ｅである。That is, the flexible portion 1 formed in a ring shape as a whole extends from the outer peripheral side to the inner peripheral side thereof, and the concave side 1b and the inner peripheral end portion of the concave side 1b and the shaft. Direction one end (upper end in the figure) toward the one end in the axial direction, the first taper portion 1c is continuously formed, and the one end portion in the axial direction of the first taper portion 1c is continuously formed and has an arcuate cross section. Part 1d
And a second taper portion 1e continuously formed toward the other end in the axial direction (upper and lower sides in the drawing) at the inner peripheral end of the bent portion 1d, the axial direction of the second taper portion 1e. The bumper 2 is integrally formed at the other end (upper and lower ends in the figure). Therefore, in this embodiment, the other portions described above are the first tapered portion 1c, the bent portion 1d, and the second tapered portion 1e.
【００１５】上記構成を備えたオイルシールにおいて
は、軸挿入方向に対する可撓部１の凹側１ｂが他の部分
より厚肉に成形されているために、この厚肉の凹側１ｂ
が有ることによって、可撓部１の保形力（反転前の状態
（姿勢）を維持しようとする作用）が従来より大きくな
っている。したがって矢示した軸挿入方向に沿って軸を
挿入する際に、可撓部１が反転するのを実質的に防止す
ることができ、また万一反転しても、軸が回転するの伴
って可撓部１が反転前の状態に戻り易い。したがって当
該実施例に係るオイルシールによれば、可撓部１が反転
するのを原因として密封対象が洩れたり、可撓部１が損
傷したりするのを未然に防止することができる。In the oil seal having the above structure, since the concave side 1b of the flexible portion 1 in the shaft inserting direction is formed thicker than the other portions, the thick concave side 1b is formed.
By virtue of this, the shape-retaining force of the flexible portion 1 (the action of maintaining the state (posture) before reversal) is greater than in the past. Therefore, it is possible to substantially prevent the flexible portion 1 from reversing when the shaft is inserted along the shaft inserting direction indicated by the arrow, and even if the flexible part 1 is reversed, the shaft is rotated. The flexible portion 1 easily returns to the state before the inversion. Therefore, according to the oil seal of the embodiment, it is possible to prevent the sealing target from leaking or the flexible portion 1 from being damaged due to the flexible portion 1 being inverted.
【００１６】第二実施例・・・図２に示すように、当該
実施例に係るオイルシールは、先ず、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４を備えており、この外周取付部４の内周
側にベロー状の可撓部１が一体成形され、この可撓部１
の内周側に環状のバンパー２が一体成形され、このバン
パー２の軸方向一端側（図上上側）に、軸（図示せず）
に摺動自在に密接する環状のシールリップ３が一体成形
され、このシールリップ３の外周面に設けられた環状の
装着溝３ａにガータスプリング６が嵌着され、所定の径
方向長さＬを備えた可撓部１のうちの、矢示した軸挿入
方向に対する凹側１ｆが他の部分より厚肉（ｔ1 ＞ｔ
2 ）に成形されている。Second Embodiment: As shown in FIG. 2, an oil seal according to the second embodiment is first mounted on an annular outer periphery formed of a rubber-like elastic material (polymer material) such as rubber or resin. And a bellows-shaped flexible portion 1 integrally formed on the inner peripheral side of the outer peripheral mounting portion 4.
An annular bumper 2 is integrally formed on the inner peripheral side of the shaft, and a shaft (not shown) is attached to one end side (upper side in the drawing) of the bumper 2 in the axial direction.
An annular seal lip 3 that is slidably in close contact with is integrally molded, and a garter spring 6 is fitted into an annular mounting groove 3a provided on the outer peripheral surface of the seal lip 3 to provide a predetermined radial length L. Of the provided flexible portion 1, the concave side 1f with respect to the axis insertion direction indicated by the arrow is thicker than other portions (t 1 > t
2 ) is molded.
【００１７】すなわち、全体として環状に成形された可
撓部１は、外周取付部４から軸方向他端側（図上下側）
に向けてこの可撓部１が始まっており、その外周側から
内周側へかけて、外周取付部４の内周端部であってかつ
軸方向他端部（図上下端部）から軸方向他端側に向けて
連続成形された第一テーパ部１ｇと、この第一テーパ部
１ｇの軸方向他端部に連続成形された凹側（第一屈曲部
とも称する）１ｆと、この凹側１ｆの内周端部に軸方向
一端側に向けて連続成形された第二テーパ部１ｈと、こ
の第二テーパ部１ｈの軸方向一端部（図上上端部）に連
続成形された断面円弧形の屈曲部（第二屈曲部とも称す
る）１ｉと、この屈曲部１ｉの内周端部に軸方向他端側
に向けて連続成形された第三テーパ部１ｊとを一体に備
えており、第三テーパ部１ｊの軸方向他端部にバンパー
２が一体成形されている。したがって当該実施例におい
て、上記した他の部分は、第一テーパ部１ｇ、第二テー
パ部１ｈ、屈曲部１ｉおよび第三テーパ部１ｊである。That is, the flexible portion 1 formed in a ring shape as a whole has the other end in the axial direction from the outer peripheral mounting portion 4 (upper and lower sides in the drawing).
The flexible portion 1 starts from the outer peripheral side to the inner peripheral side from the inner peripheral end portion of the outer peripheral mounting portion 4 and the axial other end portion (lower end portion in the figure) to the shaft. A first tapered portion 1g continuously formed toward the other end in the direction, a concave side (also referred to as a first bent portion) 1f continuously formed at the other axial end of the first tapered portion 1g, and the concave portion A second taper portion 1h continuously formed toward the one end side in the axial direction at the inner peripheral end portion of the side 1f, and a cross-sectional circle continuously formed at one end portion (the upper end portion in the drawing) in the axial direction of the second taper portion 1h. An arc-shaped bent portion (also referred to as a second bent portion) 1i and a third taper portion 1j continuously formed toward the other end in the axial direction are integrally provided at an inner peripheral end portion of the bent portion 1i. The bumper 2 is integrally formed with the other end of the third tapered portion 1j in the axial direction. Therefore, in the embodiment, the other portions described above are the first tapered portion 1g, the second tapered portion 1h, the bent portion 1i, and the third tapered portion 1j.
【００１８】上記構成を備えたオイルシールにおいて
は、軸挿入方向に対する可撓部１の凹側１ｆが他の部分
より厚肉に成形されているために、この厚肉の凹側１ｆ
が有ることによって、可撓部１の保形力（反転前の状態
（姿勢）を維持しようとする作用）が従来より大きくな
っている。したがって矢示した軸挿入方向に沿って軸を
挿入する際に、可撓部１が反転するのを実質的に防止す
ることができ、また万一反転しても、軸が回転するの伴
って可撓部１が反転前の状態に戻り易い。したがって当
該実施例に係るオイルシールによれば、可撓部１が反転
するのを原因として密封対象が洩れたり、可撓部１が損
傷したりするのを未然に防止することができる。In the oil seal having the above structure, the concave side 1f of the flexible portion 1 with respect to the shaft insertion direction is formed thicker than the other portions, so that the thick concave side 1f is formed.
By virtue of this, the shape-retaining force of the flexible portion 1 (the action of maintaining the state (posture) before reversal) is greater than in the past. Therefore, it is possible to substantially prevent the flexible portion 1 from reversing when the shaft is inserted along the shaft inserting direction indicated by the arrow, and even if the flexible part 1 is reversed, the shaft is rotated. The flexible portion 1 easily returns to the state before the inversion. Therefore, according to the oil seal of the embodiment, it is possible to prevent the sealing target from leaking or the flexible portion 1 from being damaged due to the flexible portion 1 being inverted.
【００１９】第三実施例・・・図３に示すように、当該
実施例に係るオイルシールは、先ず、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４を備えており、この外周取付部４の内周
側にベロー状の可撓部１が一体成形され、この可撓部１
の内周側に環状のバンパー２が一体成形され、このバン
パー２の軸方向一端側（図上上側）に、軸（図示せず）
に摺動自在に密接する環状のシールリップ３が一体成形
され、このシールリップ３の外周面に設けられた環状の
装着溝３ａにガータスプリング６が嵌着され、所定の径
方向長さＬを備えた可撓部１のうちの、矢示した軸挿入
方向に対する凹側１ｋが他の部分より厚肉（ｔ1 ＞ｔ
2 ）に成形されている。Third Embodiment: As shown in FIG. 3, the oil seal according to the third embodiment is first mounted on an annular outer periphery formed of a rubber-like elastic material (polymer material) such as rubber or resin. And a bellows-shaped flexible portion 1 integrally formed on the inner peripheral side of the outer peripheral mounting portion 4.
An annular bumper 2 is integrally formed on the inner peripheral side of the shaft, and a shaft (not shown) is attached to one end side (upper side in the drawing) of the bumper 2 in the axial direction.
An annular seal lip 3 that is slidably in close contact with is integrally molded, and a garter spring 6 is fitted into an annular mounting groove 3a provided on the outer peripheral surface of the seal lip 3 to provide a predetermined radial length L. Of the flexible portion 1 provided, the concave side 1k with respect to the axis insertion direction shown by the arrow is thicker than other portions (t 1 > t
2 ) is molded.
【００２０】すなわち、全体として環状に成形された可
撓部１は、外周取付部４から軸方向一端側に向けてこの
可撓部１が始まっており、その外周側から内周側へかけ
て、外周取付部４の内周端部であってかつ軸方向一端部
（図上上端部）から軸方向一端側に向けて連続成形され
た第一テーパ部１ｌと、この第一テーパ部１ｌの軸方向
一端部に連続成形された断面円弧形の第一屈曲部１ｍ
と、この第一屈曲部１ｍの内周端部に軸方向他端側（図
上下側）に向けて連続成形された第二テーパ部１ｎと、
この第二テーパ部１ｎの軸方向他端部（図上下端部）に
連続成形された断面円弧形の第二屈曲部１ｏと、この第
二屈曲部１ｏの内周端部に連続成形された凹側（第三テ
ーパ部とも称する）１ｋとを一体に備えており、凹側１
ｋの軸方向一端部にバンパー２が一体成形されている。
したがって当該実施例において、上記した他の部分は、
第一テーパ部１ｌ、第一屈曲部１ｍ、第二テーパ部１ｎ
および第二屈曲部１ｏである。That is, in the flexible portion 1 formed in a ring shape as a whole, the flexible portion 1 starts from the outer peripheral mounting portion 4 toward one end side in the axial direction, and extends from the outer peripheral side to the inner peripheral side. A first taper portion 1l which is an inner peripheral end portion of the outer peripheral mounting portion 4 and which is continuously formed from one axial end portion (upper end portion in the drawing) toward one axial end portion, and the first tapered portion 11 1m of 1st bending part of circular arc shape continuously formed at one end in the axial direction
And a second taper portion 1n continuously formed toward the other end in the axial direction (upper and lower sides in the drawing) at the inner peripheral end of the first bent portion 1m,
A second bent portion 1o having an arc-shaped cross section continuously formed at the other axial end (lower end in the figure) of the second tapered portion 1n, and an inner peripheral end portion of the second bent portion 1o are continuously formed. The concave side (also referred to as the third taper portion) 1k is integrally provided, and the concave side 1
The bumper 2 is integrally formed at one end in the axial direction of k.
Therefore, in the embodiment, the other parts described above are
First taper portion 1l, first bent portion 1m, second taper portion 1n
And the second bent portion 1o.
【００２１】上記構成を備えたオイルシールにおいて
は、軸挿入方向に対する可撓部１の凹側１ｋが他の部分
より厚肉に成形されているために、この厚肉の凹側１ｋ
が有ることによって、可撓部１の保形力（反転前の状態
（姿勢）を維持しようとする作用）が従来より大きくな
っている。したがって矢示した軸挿入方向に沿って軸を
挿入する際に、可撓部１が反転するのを実質的に防止す
ることができ、また万一反転しても、軸が回転するの伴
って可撓部１が反転前の状態に戻り易い。したがって当
該実施例に係るオイルシールによれば、可撓部１が反転
するのを原因として密封対象が洩れたり、可撓部１が損
傷したりするのを未然に防止することができる。In the oil seal having the above structure, the concave side 1k of the flexible portion 1 with respect to the shaft insertion direction is formed thicker than the other portions, so that the thick concave side 1k is formed.
By virtue of this, the shape-retaining force of the flexible portion 1 (the action of maintaining the state (posture) before reversal) is greater than in the past. Therefore, it is possible to substantially prevent the flexible portion 1 from reversing when the shaft is inserted along the shaft inserting direction indicated by the arrow, and even if the flexible part 1 is reversed, the shaft is rotated. The flexible portion 1 easily returns to the state before the inversion. Therefore, according to the oil seal of the embodiment, it is possible to prevent the sealing target from leaking or the flexible portion 1 from being damaged due to the flexible portion 1 being inverted.
【００２２】第四実施例・・・図４に示すように、当該
実施例に係るオイルシールは、先ず、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ベロ
ー状の可撓部１を備えており、この可撓部１の内周側に
環状のバンパー２が一体成形され、このバンパー２の軸
方向一端側（図上上側）に、軸（図示せず）に摺動自在
に密接する環状のシールリップ３が一体成形され、この
シールリップ３の外周面に設けられた環状の装着溝３ａ
にガータスプリング６が嵌着され、可撓部１に設けられ
た唯一の断面円弧形の屈曲部１ｐが矢示した軸挿入方向
に対して反対側、すなわち軸を挿入する方向から見て遠
い側、すなわち図上上方に配置されている。Fourth Embodiment As shown in FIG. 4, the oil seal according to the fourth embodiment is first formed of a bellows-like elastic member formed of a rubber-like elastic material (polymer material) such as rubber or resin. A flexible portion 1 is provided, and an annular bumper 2 is integrally formed on the inner peripheral side of the flexible portion 1, and one end side (upper side in the figure) of the bumper 2 in the axial direction is slid on a shaft (not shown). An annular seal lip 3 that is movably in close contact is integrally molded, and an annular mounting groove 3a is provided on the outer peripheral surface of the seal lip 3.
The garter spring 6 is fitted into the flexible part 1 and the only bent part 1p having an arcuate cross section provided on the flexible part 1 is on the opposite side to the shaft inserting direction indicated by the arrow, that is, far from the shaft inserting direction. It is arranged on the side, that is, on the upper side in the drawing.
【００２３】上記構成を備えたオイルシールにおいて
は、可撓部１の唯一の屈曲部１ｐが軸挿入方向に対して
反対側に設けられているために、この可撓部１は初めか
ら反転後の状態（姿勢）に置かれたようなものである。
したがって矢示した軸挿入方向に沿って軸を挿入する際
に、可撓部１が反転するのを実質的に防止することがで
き、可撓部１が反転するのを原因として密封対象が洩れ
たり、可撓部１が損傷したりするのを未然に防止するこ
とができる。In the oil seal having the above-described structure, since the only bent portion 1p of the flexible portion 1 is provided on the opposite side with respect to the shaft insertion direction, the flexible portion 1 is reversed from the beginning. It is like being placed in the state (posture).
Therefore, it is possible to substantially prevent the flexible portion 1 from reversing when the shaft is inserted along the shaft inserting direction indicated by the arrow, and the sealing target leaks due to the reversing of the flexible portion 1. It is possible to prevent the flexible portion 1 from being damaged.
【００２４】[0024]
【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.
【００２５】すなわち、先ず、上記構成を備えた本発明
の請求項１によるオイルシールにおいては、軸挿入方向
に対する可撓部の凹側が他の部分より厚肉に成形されて
いるために、この厚肉の凹側が有ることによって、可撓
部の保形力（反転前の状態（姿勢）を維持しようとする
作用）が従来より大きくなっている。したがって軸挿入
方向に沿って軸を挿入する際に、可撓部が反転するのを
実質的に防止することができ、また万一反転しても、軸
が回転するの伴って可撓部が反転前の状態に戻り易い。
したがって当該実施例に係るオイルシールによれば、可
撓部が反転するのを原因として密封対象が洩れたり、可
撓部が損傷したりするのを未然に防止することができ
る。That is, first, in the oil seal according to claim 1 of the present invention having the above-mentioned structure, since the concave side of the flexible portion with respect to the shaft insertion direction is formed thicker than other portions, this thickness Due to the presence of the concave side of the flesh, the shape-retaining force of the flexible portion (the action of maintaining the state (posture) before reversal) is greater than in the past. Therefore, when the shaft is inserted along the shaft insertion direction, it is possible to substantially prevent the flexible portion from reversing, and even if it is reversed, the flexible portion will be rotated as the shaft rotates. It is easy to return to the state before reversal.
Therefore, according to the oil seal of the embodiment, it is possible to prevent the sealing target from leaking or the flexible portion being damaged due to the flexible portion being inverted.
【００２６】また上記構成を備えた本発明の請求項２に
よるオイルシールにおいては、可撓部の屈曲部が軸挿入
方向に対して反対側に設けられているために、この可撓
部が初めから反転後の状態（姿勢）に置かれたようなも
のである。したがって軸挿入方向に沿って軸を挿入する
際に、可撓部が反転するのを実質的に防止することがで
き、可撓部が反転するのを原因として密封対象が洩れた
り、可撓部が損傷したりするのを未然に防止することが
できる。In the oil seal according to claim 2 of the present invention having the above structure, since the bending portion of the flexible portion is provided on the side opposite to the axial insertion direction, the flexible portion is initially formed. It is like being placed in the state (posture) after flipping. Therefore, when the shaft is inserted along the shaft insertion direction, it is possible to substantially prevent the flexible portion from reversing, the leakage of the sealing target due to the reversing of the flexible portion, or the flexible portion. Can be prevented from being damaged.
【図１】本発明の第一実施例に係るオイルシールの要部
断面図FIG. 1 is a sectional view of an essential part of an oil seal according to a first embodiment of the present invention.
【図２】本発明の第二実施例に係るオイルシールの要部
断面図FIG. 2 is a sectional view of an essential part of an oil seal according to a second embodiment of the present invention.
【図３】本発明の第三実施例に係るオイルシールの要部
断面図FIG. 3 is a sectional view of an essential part of an oil seal according to a third embodiment of the present invention.
【図４】本発明の第四実施例に係るオイルシールの要部
断面図FIG. 4 is a sectional view of an essential part of an oil seal according to a fourth embodiment of the present invention.
【図５】従来例に係るオイルシールの要部断面図FIG. 5 is a sectional view of an essential part of an oil seal according to a conventional example.
【図６】従来例に係るオイルシールの要部断面図FIG. 6 is a sectional view of an essential part of an oil seal according to a conventional example.
【図７】従来例に係るオイルシールの要部断面図FIG. 7 is a cross-sectional view of essential parts of an oil seal according to a conventional example.
【図８】従来例に係るオイルシールが反転した状態を示
す要部断面図FIG. 8 is a cross-sectional view of essential parts showing a state in which an oil seal according to a conventional example is reversed.
１ 可撓部 １ａ，１ｄ，１ｉ，１ｍ，１ｏ，１ｐ 屈曲部 １ｂ，１ｆ，１ｋ 凹側 １ｃ，１ｅ，１ｇ，１ｈ，１ｊ，１ｌ，１ｎ テーパ部 ２ バンパー ３ シールリップ ３ａ 装着溝 ４ 外周取付部 ５ 軸 ６ ガータスプリング 1 flexible part 1a, 1d, 1i, 1m, 1o, 1p bent part 1b, 1f, 1k concave side 1c, 1e, 1g, 1h, 1j, 1l, 1n taper part 2 bumper 3 seal lip 3a mounting groove 4 outer peripheral mounting Part 5 axis 6 garter spring
Claims (2)
撓部（１）の内周側にバンパー（２）およびシールリッ
プ（３）を設けたオイルシールにおいて、軸挿入方向に
対する前記可撓部（１）の凹側（１ｂ）（１ｆ）（１
ｋ）を他の部分より厚肉にしたことを特徴とするオイル
シール。1. An oil seal having a bellows-shaped flexible portion (1), and a bumper (2) and a seal lip (3) provided on the inner peripheral side of the flexible portion (1), in the axial insertion direction. Concave side (1b) (1f) (1 of said flexible part (1)
An oil seal characterized in that k) is thicker than other parts.
撓部（１）の内周側にバンパー（２）およびシールリッ
プ（３）を設けたオイルシールにおいて、前記可撓部
（１）の屈曲部（１ｐ）を軸挿入方向に対して反対側に
設けたことを特徴とするオイルシール。2. An oil seal comprising a bellows-shaped flexible part (1), wherein a bumper (2) and a seal lip (3) are provided on the inner peripheral side of the flexible part (1). An oil seal characterized in that the bent portion (1p) of (1) is provided on the opposite side to the shaft insertion direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7295951A JPH09112706A (en) | 1995-10-20 | 1995-10-20 | Oil seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7295951A JPH09112706A (en) | 1995-10-20 | 1995-10-20 | Oil seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09112706A true JPH09112706A (en) | 1997-05-02 |
Family
ID=17827218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7295951A Pending JPH09112706A (en) | 1995-10-20 | 1995-10-20 | Oil seal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09112706A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025173219A1 (en) * | 2024-02-16 | 2025-08-21 | Nok株式会社 | Sealing device |
| EP4425016A4 (en) * | 2021-10-26 | 2025-10-22 | Nok Corp | STEERING DUST SEAL AND SEALING DEVICE |
-
1995
- 1995-10-20 JP JP7295951A patent/JPH09112706A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4425016A4 (en) * | 2021-10-26 | 2025-10-22 | Nok Corp | STEERING DUST SEAL AND SEALING DEVICE |
| US12578018B2 (en) | 2021-10-26 | 2026-03-17 | Nok Corporation | Steering dust seal and sealing device |
| WO2025173219A1 (en) * | 2024-02-16 | 2025-08-21 | Nok株式会社 | Sealing device |
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