JP3834079B2 - Lip seal and stern tube sealing device - Google Patents

Lip seal and stern tube sealing device Download PDF

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Publication number
JP3834079B2
JP3834079B2 JP18969995A JP18969995A JP3834079B2 JP 3834079 B2 JP3834079 B2 JP 3834079B2 JP 18969995 A JP18969995 A JP 18969995A JP 18969995 A JP18969995 A JP 18969995A JP 3834079 B2 JP3834079 B2 JP 3834079B2
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Prior art keywords
thin film
lip
seal
tip
lip seal
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JP18969995A
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JPH094719A (en
Inventor
久志 吉田
正樹 西野
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日本マリンテクノ株式会社
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

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  • Sealing With Elastic Sealing Lips (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は船舶用船尾管シール装置に用いるリップシール及び船舶用船尾管シール装置に関するものである。
【０００２】
【従来の技術】
従来の船外側船尾管シール装置を図５に示す。この船尾管シール装置では、３本のリップシールを用いた弾性体シールリングが装着され、シールリング２１及び２２は海水側を向きシールリング２３は船内側を向いて配置されている。シールリング２１は、海水を封止することに加え、いわゆるダストシールとして船外海水側からの異物がシール装置の内部に侵入することを阻止する働きを有している。また、シールリング２２及び２３は、それぞれ海水または船尾管内の潤滑油を封止する役目を果たすものである。
【０００３】
【発明が解決しようとする課題】
図５における従来の船外側船尾管シール装置２０では、シールリング２１が船外からの異物、特に、近年海中に多く浮遊するようになった漁網によって損傷を受けることが頻繁にあり、極端な場合は漁網がシールリング２１とライナー２４との隙間を通過してシールリング２２まで達し、シールリング２１，２２共に損傷することさえも見受けられる。
【０００４】
このようなシールリングの損傷を防止するために、実願昭６０−１９４９８に示されているような漁網侵入阻止リングを最後部シールリングの後部側に設けることが実施されている。しかしながら、漁網侵入阻止リング及びこれを収納する支持部材をシール装置に付加することは、シール装置が構造的に複雑になるのみならずコスト的にも高価なものにならざるを得ない。
そこで、本発明においては、漁網侵入阻止リングなどの付加的な手段を用いることなく、漁網等の海水中の異物がシール装置内に侵入することを防止する漁網侵入阻止手段を具備するシールリングを提供する。
【０００５】
【課題を解決するための手段】
本発明は、ゴムまたはエラストマー製のリップシールにおいて、リップ先端より延びてリップ正面側に向かって小径となって内径面が円錐面形状をなす薄膜をリップシールと一体に形成し、この薄膜の軸方向断面における肉厚が薄膜の根元から先端に向かって徐々に薄くなっており、かつ、この薄膜の先端が丸みを帯びておらず、さらに、薄膜の根元の内径全周にわたって窪みが設けられ、この窪みによってリップ先端と分離して形成されており、軸またはライナーを挿入しない自由状態において、リップシールの軸方向断面におけるリップ摺動面と軸心とのなす角度に比べて、薄膜の内径面と軸心とのなす角度が小さいことを特徴とする薄膜によって、漁網の侵入を阻止しリップ先端を保護するものである。
【０００６】
また、薄膜の内径面において薄膜の根元から先端まで軸方向につながる溝が設けられていてもよい。
本発明のいま一つは、複数のリップシールを用いたシールリングによって構成される船尾管シール装置において、少なくとも海水側を向いたシールリングとして上記の薄膜付リップシールを装着するものである。
【０００７】
【作用】
上記の薄膜付リップシールによれば、薄膜がリップシールと一体に形成され、リップ先端より延びてリップ正面側に向かって小径となって内径面が円錐面形状をなし、さらに薄膜の内径面と軸心とのなす角度が小さいので、回転の有無に拘らず軸またはライナーの摺動面全周に薄膜の内径面が容易に摺接することができ、また、薄膜の軸方向断面における肉厚が薄膜の根元から先端に向かって徐々に薄くなり、かつ先端が丸みを帯びていない形状となっているため、薄膜内径側の周接面と軸またはライナー面との間に漁網などの異物が潜り込むことがないので、異物がこの薄膜を通過してリップ先端まで到達することを阻止でき、さらに薄膜の根元の内径全周にわたって窪みが設けられ、この窪みによってリップ先端と薄膜とが分離して形成されているため、リップ先端の潤滑が確保され易く磨耗が生じにくい。従って、リップ先端が海中の異物によって損傷することがなく、リップシールとしての信頼性が向上する。
さらに、この薄膜付リップシールを後部船尾管シール装置の少なくとも海水側を向いたシールリングに適用することによって、船尾管シール装置を複雑構造かつ高価にすることなく、シール装置全体の信頼性を高めることができる。
【０００８】
【実施例】
以下、本発明における実施例を、図１，図２，図３及び図４に基づき説明する。図１は薄膜付リップシールの第１実施例であり、ゴムまたはエラストマー製のリップシール１のリップ先端２の相当する部分より延びた薄膜３を、リップ正面側４に向かって小径となって内径面５が円錐の曲面形状をなすようにリップシール１と一体に形成したもので、この薄膜３の軸方向断面における肉厚は薄膜の根元６から先端７に向かって徐々に薄くなっており、かつ、この薄膜３の先端７が丸みを帯びておらず、さらに、薄膜３の内径面５の全周にわたる窪み８を設け、自由状態における薄膜３の内径面５と軸心１１とのなす角度αをリップ摺動面９と軸心１１とのなす角度βに比べて小さくしたものである。従って、図２に示すように、リップシール１にライナー２４を挿入すると、角度αが小さいため薄膜３の変形を少なくすることができ、薄膜３の内径面５はライナー２４の全周にわたって隙間なく摺接する状態になる。このため、漁網等の海中の異物は薄膜３とライナー２４の間に入り込むことができなくなり、リップ先端２が海中の異物によって損傷することが防止できる。また、窪み８によってリップ先端２と薄膜３が分離して形成されるため、リップ先端２の潤滑が確保され易くなって摩耗が生じにくくなる。
【０００９】
図３は薄膜付リップシールの第２実施例であり、図１に示した第１実施例に対し、薄膜３の根元６から先端７まで軸方向につながった１本または複数の溝１０を設けたものである。この溝１０によって、ライナー２４を挿入した場合に薄膜３とリップ先端２との間に滞留している流体が薄膜３の外部にある流体と入れ替わり易くなるため、リップ先端２の潤滑及び冷却が促進されリップ先端２とその周囲の摩耗及び劣化が起こりにくくなる。
【００１０】
図４に示す船外側船尾管シール装置２０の実施例において、１，２２及び２３はプロペラ軸２５に取り付けたライナー２４に摺接するゴムまたはエラストマー製の弾性体シールリングであり、これらは船体船尾部材２６に固着されている船外側船尾管シール装置２０のハウジング部材２７よって保持されている。シールリング１及び２２は船尾側にあって海水側に向けて配列し海水を封止する作用を行う。また、シールリング２３は船内側に向けて配列し船尾管潤滑油を封止する作用を行う。この実施例においては、上記の第１実施例によって示した薄膜付のリップシール１が最後部のシールリングとして装着されており、これによって漁網等の海中の異物がシール装置内に侵入することを阻止する。
【００１１】
【発明の効果】
以上のように、本発明の薄膜付リップシールによって漁網などの海中の異物がこの薄膜を通過してリップ先端まで到達することを阻止できるので、リップ先端が異物によって損傷することがなく、その結果リップシールとしての信頼性が向上する。
さらに、この薄膜付リップシールを後部船尾管シール装置の少なくとも海水側を向いたシールリングに適用することによって、船尾管シール装置を複雑構造かつ高価にすることなく、その信頼性を高めることができる。
【図面の簡単な説明】
【図１】 本発明の薄膜付リップシールの第１実施例を示す半裁断面図である。
【図２】 本発明の第１実施例による薄膜付きリップシールにライナーを挿入した状態を示す半裁断面図である。
【図３】 本発明の薄膜付リップシールの第２実施例を示す半裁断面図である。
【図４】 本発明の第１実施例による薄膜付リップシールを船外側船尾管シール装置に装着した場合の実施例を示す半裁断面図である。
【図５】 従来の船外側船尾管シール装置を示す半裁断面図である。
【符号の説明】
１ リップシール
２ リップ先端
３ 薄膜
４ リップ正面側
５ 内径面
６ 根元
７ 先端
８ 窪み
９ リップ摺動面
１０ 溝
１１ 軸心
２０ 船外側船尾管シール装置
２１，２２，２３ シールリング
２４ ライナー
２５ プロペラ軸
２６ 船体船尾部材
２７ ハウジング部材
α 内径面５と軸心１１とのなす角度
β リップ摺動面９と軸心１１とのなす角度[0001]
[Industrial application fields]
The present invention relates to a lip seal and a stern tube sealing device for a ship that are used in a stern tube sealing device for a ship.
[0002]
[Prior art]
Conventional ship outer stern tube sealing apparatus shown in FIG. In this stern tube sealing device, an elastic seal ring using three lip seals is mounted, the seal rings 21 and 22 are arranged facing the seawater side, and the seal ring 23 is arranged facing the inside of the ship. In addition to sealing seawater, the seal ring 21 has a function of preventing foreign matter from the outboard seawater side from entering the inside of the sealing device as a so-called dust seal. The seal rings 22 and 23 serve to seal seawater or lubricating oil in the stern tube, respectively.
[0003]
[Problems to be solved by the invention]
In the conventional outboard stern tube sealing device 20 in FIG. 5 , the seal ring 21 is often damaged by foreign matter from the outside of the ship, particularly fishing nets that have recently become more floating in the sea. The fishing net passes through the gap between the seal ring 21 and the liner 24 and reaches the seal ring 22, and it can be seen that both the seal rings 21 and 22 are damaged.
[0004]
In order to prevent such damage to the seal ring, a fishing net intrusion prevention ring as shown in Japanese Utility Model Application No. 60-19498 is provided on the rear side of the rearmost seal ring. However, adding a fishing net intrusion prevention ring and a support member for housing the fishing net intrusion to the seal device inevitably makes the seal device not only structurally complex but also expensive.
Therefore, in the present invention, there is provided a seal ring provided with fishing net intrusion prevention means for preventing foreign matter in seawater such as fishing nets from entering the seal device without using additional means such as a fishing net intrusion prevention ring. provide.
[0005]
[Means for Solving the Problems]
In the lip seal made of rubber or elastomer, a thin film extending from the tip of the lip and having a small diameter toward the front surface of the lip and having a conical surface shape inside diameter is formed integrally with the lip seal. The thickness in the direction cross section gradually decreases from the base of the thin film toward the tip, and the tip of the thin film is not rounded, and further, a depression is provided over the entire inner circumference of the base of the thin film, The inner surface of the thin film is formed separately from the tip of the lip by this recess, and in the free state where the shaft or liner is not inserted, compared to the angle between the lip sliding surface and the shaft center in the axial section of the lip seal A thin film characterized by a small angle between the shaft and the axis prevents fishing nets from entering and protects the tip of the lip.
[0006]
It may also have a groove leading to the axial direction is provided in the inner surface of the thin film from the base of the thin film to the tip.
According to another aspect of the present invention, in the stern tube sealing device constituted by a seal ring using a plurality of lip seals, the lip seal with a thin film is mounted as a seal ring facing at least the seawater side.
[0007]
[Action]
According to the thin film with the lip seal described above, the thin film is formed integrally with the lip seal, the inner diameter surface becomes smaller diameter to name a conical surface shape toward the lip front extends from the lip tip, yet the inner diameter surface of the thin-film Since the angle between the shaft and the shaft center is small , the inner diameter surface of the thin film can be easily brought into sliding contact with the entire circumference of the sliding surface of the shaft or liner regardless of whether or not it is rotated. Is gradually thinned from the base of the thin film toward the tip, and the tip is not rounded.For this reason, foreign matter such as fishing nets are not present between the peripheral surface on the inner diameter side of the thin film and the shaft or liner surface. Since it does not sink in, it can prevent foreign matter from passing through this thin film and reaching the lip tip, and a dent is provided around the entire inner diameter of the base of the thin film, which separates the lip tip from the thin film. Formation Because it is, lubrication of the lip end is secured easily wear is unlikely to occur. Therefore, the lip tip is not damaged by foreign matter in the sea, and the reliability as a lip seal is improved.
Furthermore, by applying this lip seal with a thin film to a seal ring facing at least the seawater side of the rear stern tube sealing device, the reliability of the entire stern tube sealing device is increased without making the stern tube sealing device complex and expensive. be able to.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG . FIG. 1 shows a first embodiment of a lip seal with a thin film. A thin film 3 extending from a corresponding portion of a lip tip 2 of a lip seal 1 made of rubber or elastomer has a small diameter toward a lip front side 4 and has an inner diameter. The surface 5 is formed integrally with the lip seal 1 so as to form a conical curved surface, and the thickness of the thin film 3 in the axial cross section gradually decreases from the root 6 to the tip 7 of the thin film. Further, the tip 7 of the thin film 3 is not rounded, and further, a depression 8 is provided over the entire circumference of the inner diameter surface 5 of the thin film 3, and the angle formed by the inner diameter surface 5 of the thin film 3 and the axis 11 in a free state. α is made smaller than the angle β formed between the lip sliding surface 9 and the shaft center 11 . Therefore, as shown in FIG. 2, when the liner 24 is inserted into the lip seal 1, the angle α is small, so that the deformation of the thin film 3 can be reduced, and the inner diameter surface 5 of the thin film 3 has no gap over the entire circumference of the liner 24. It will be in the state of sliding contact. For this reason, foreign matter such as fishing nets cannot enter between the thin film 3 and the liner 24, and the lip tip 2 can be prevented from being damaged by foreign matter. Further, since the lip tip 2 and the thin film 3 are formed separately by the recess 8, lubrication of the lip tip 2 is easily ensured and wear is less likely to occur.
[0009]
FIG. 3 shows a second embodiment of the lip seal with a thin film. In contrast to the first embodiment shown in FIG. 1 , one or a plurality of grooves 10 connected in the axial direction from the root 6 to the tip 7 of the thin film 3 are provided. It is a thing. The groove 10 facilitates lubrication and cooling of the lip tip 2 because the fluid staying between the thin film 3 and the lip tip 2 is easily replaced with the fluid outside the thin film 3 when the liner 24 is inserted. Thus, wear and deterioration of the lip tip 2 and its surroundings are less likely to occur.
[0010]
In the embodiment of the outboard stern tube sealing device 20 shown in FIG. 4 , reference numerals 1, 22 and 23 are rubber or elastomer elastic seal rings which are in sliding contact with a liner 24 attached to the propeller shaft 25, and these are hull stern members. It is held by the housing member 27 of the outboard stern tube sealing device 20 that is fixed to 26. The seal rings 1 and 22 are on the stern side and are arranged toward the seawater side to seal the seawater. Further, the seal ring 23 is arranged toward the inner side of the ship and functions to seal the stern tube lubricating oil. In this embodiment, the lip seal 1 with a thin film shown in the first embodiment is mounted as the last seal ring, and this allows foreign matter such as fishing nets to enter the sealing device. Stop.
[0011]
【The invention's effect】
As described above, the lip seal with a thin film of the present invention can prevent foreign matter in the sea such as fishing nets from passing through this thin film and reaching the lip tip, so that the lip tip is not damaged by the foreign matter, and as a result Reliability as a lip seal is improved.
Furthermore, by applying this lip seal with a thin film to a seal ring facing at least the seawater side of the rear stern tube sealing device, the reliability of the stern tube sealing device can be enhanced without making the stern tube sealing device complicated and expensive. .
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a first embodiment of a lip seal with a thin film according to the present invention.
FIG. 2 is a half sectional view showing a state in which a liner is inserted into the lip seal with a thin film according to the first embodiment of the present invention.
FIG. 3 is a half sectional view showing a second embodiment of a lip seal with a thin film according to the present invention.
FIG. 4 is a half sectional view showing an embodiment in which the lip seal with a thin film according to the first embodiment of the present invention is mounted on an outboard stern tube sealing device.
FIG. 5 is a half cut sectional view showing a conventional outboard stern tube sealing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lip seal 2 Lip tip 3 Thin film 4 Lip front side 5 Inner diameter surface 6 Root 7 Tip 8 Indentation 9 Lip sliding surface 10 Groove 11 Axis 20 Outboard stern tube sealing device 21, 22, 23 Seal ring 24 Liner 25 Propeller shaft 26 Hull stern member 27 Housing member α Angle formed between the inner diameter surface 5 and the shaft center 11 Angle formed between the lip sliding surface 9 and the shaft center 11

Claims (3)

リップ先端より延びてリップ正面側に向かって小径となって内径面が円錐面形状をなす薄膜をリップシールと一体に形成し、この薄膜の軸方向断面における肉厚が薄膜の根元から先端に向かって徐々に薄くなっており、かつこの薄膜の先端が丸みを帯びておらず、薄膜の根元の内径全周にわたって窪みが設けられ、この窪みによってリップ先端と薄膜とが分離して形成されており、軸またはライナーを挿入しない自由状態において、リップシールの軸方向断面におけるリップ摺動面と軸心とのなす角度に比べて、薄膜の内径面と軸心とのなす角度が小さいことを特徴とするゴムまたはエラストマー製の薄膜付リップシール。A thin film extending from the tip of the lip and having a small diameter toward the front side of the lip and having a conical shape on the inner diameter is formed integrally with the lip seal, and the thickness of the thin film in the axial section extends from the base of the thin film toward the tip. and gradually thin Te, and not the tip of the thin film is rounded, it is provided a recess for the base of the inner diameter the entire circumference of the thin film, the lip tip and the thin film are formed separately by the recess In the free state in which the shaft or liner is not inserted, the angle formed between the inner surface of the thin film and the shaft center is smaller than the angle formed between the lip sliding surface and the shaft center in the axial section of the lip seal. A lip seal with a thin film made of rubber or elastomer. 薄膜の内径面において薄膜の根元から先端まで軸方向につながる溝が設けられていることを特徴とする請求項１に記載の薄膜付リップシール。The lip seal with a thin film according to claim 1, wherein a groove is provided on the inner diameter surface of the thin film in the axial direction from the base to the tip of the thin film. 複数のリップシールを用いたシールリングによって構成され、少なくとも海水側を向いたシールリングとして、請求項１または２に記載の薄膜付リップシールを装着することを特徴とする船尾管シール装置。 3. A stern tube sealing device, comprising a seal ring using a plurality of lip seals, wherein the lip seal with a thin film according to claim 1 or 2 is mounted as a seal ring facing at least a seawater side.
JP18969995A 1995-06-20 1995-06-20 Lip seal and stern tube sealing device Expired - Lifetime JP3834079B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18969995A JP3834079B2 (en) 1995-06-20 1995-06-20 Lip seal and stern tube sealing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18969995A JP3834079B2 (en) 1995-06-20 1995-06-20 Lip seal and stern tube sealing device

Publications (2)

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JPH094719A JPH094719A (en) 1997-01-07
JP3834079B2 true JP3834079B2 (en) 2006-10-18

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JP2008111509A (en) * 2006-10-31 2008-05-15 Nok Corp Oil seal
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