JPS61159129A - Detecting device for oil leak of shaft seal - Google Patents
Detecting device for oil leak of shaft sealInfo
- Publication number
- JPS61159129A JPS61159129A JP59278979A JP27897984A JPS61159129A JP S61159129 A JPS61159129 A JP S61159129A JP 59278979 A JP59278979 A JP 59278979A JP 27897984 A JP27897984 A JP 27897984A JP S61159129 A JPS61159129 A JP S61159129A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- shaft seal
- reservoir
- shaft
- leak
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
- G01M3/2869—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals for seals not incorporated in a pipe joint
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は軸シールの油漏洩検知装置に関し、詳しくは、
主駆動軸を経て軸シールの外部へ流出する作動油を検出
する装置に関する。これは、油圧ポンプなど圧力を有す
る作動油が流通する油圧機器などの分野で利用されるも
のである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil leak detection device for a shaft seal.
The present invention relates to a device for detecting hydraulic oil flowing out of a shaft seal through a main drive shaft. This is used in the field of hydraulic equipment, such as hydraulic pumps, in which hydraulic fluid under pressure flows.
電動機あるいはエンジンなどで駆動される油圧ポンプに
おいては、軸受の破損やピストン回りの損傷など本体内
部での故障を除いて最も多く生じる不具合は、軸シール
での油漏れである。従来は、ケーシングから油漏れがあ
って始めて目視確認されるので、不具合の発見が遅れて
修理に手間取ったり、それを搭載した車両などの稼働効
率を低下させたり、その漏洩油で油圧ポンプ自体やその
周囲の車体さらには路上などを汚染する問題が起こって
いる。In hydraulic pumps driven by electric motors or engines, the most common problem, other than failures inside the main body such as bearing damage or damage around the piston, is oil leakage from the shaft seal. Conventionally, oil leakage from the casing was first detected visually, so the discovery of the problem was delayed, making repairs time-consuming, reducing the operating efficiency of vehicles equipped with it, and causing damage to the hydraulic pump itself or There is a problem of contamination of surrounding car bodies and roads.
ところで、油圧ポンプを搭載する油圧パワーショベルな
どが年々大型化され、種々の装置や部品が使用されるよ
うになってきているので、パワーショベルの保守や点検
の面から、油圧ポンプを始めとした各種作動装置などの
長寿命化・信頼性の向上・手入れの不要化・誤動作の防
止などの要求が一層強まっている。そのために、各装置
における故障の発生率の低減と、その早期の検知を可能
にするための検知の自動化が望まれている。By the way, hydraulic power excavators equipped with hydraulic pumps are becoming larger year by year, and various devices and parts are being used. There are growing demands for longer lifespans, improved reliability, no need for maintenance, prevention of malfunctions, etc. of various operating devices. For this reason, it is desired to reduce the occurrence rate of failures in each device and to automate detection to enable early detection.
上述した油圧ポンプは技術の向上でその寿命が延びては
いるが、耐久性に限りがある。オイルシールなどの軸シ
ールも例外でなく、その保守面などから自動的に油漏れ
を検知することが必要とされる。その上、その検知装置
自体も他の装置以上に長寿命化・信頼性の向上・手入れ
の不要化・誤動作の防止などが要求されるわけであり、
油圧パワーショベルのようにその動きが多様でしかも振
動の激しいものに搭載されている場合でも、トラブルの
発生し難いものでなければならない。Although improvements in technology have extended the lifespan of the hydraulic pumps described above, their durability is limited. Shaft seals such as oil seals are no exception, and from the standpoint of maintenance, it is necessary to automatically detect oil leaks. Furthermore, the detection device itself is required to have a longer lifespan, improved reliability, requires no maintenance, and prevents malfunctions than other devices.
It must be able to resist problems even when mounted on something that moves in a variety of ways and is subject to strong vibrations, such as a hydraulic power shovel.
本発明は上述の問題に鑑みてなされたもので、その目的
は、油圧ポンプなどの軸シールからの油漏れを自動的に
検出でき、その検知に必要な構成品が長寿命・高信頼性
・手入れ不要なものであり、検出に当たっては、車体の
傾斜・振動に影響されることなく誤動作しない軸シール
の油漏洩検知装置を提供することである。The present invention was made in view of the above-mentioned problems, and its purpose is to automatically detect oil leakage from the shaft seal of a hydraulic pump, etc., and to ensure that the components necessary for the detection have a long life, high reliability, and It is an object of the present invention to provide an oil leakage detection device for a shaft seal that does not require maintenance and is not affected by tilting or vibration of a vehicle body and does not malfunction.
本発明の軸シールの油漏洩検知装置の特徴とするところ
を、第1図(a)、 (b)を参照して説明すると、
ケーシング内の作動油が主駆動軸3を経て外部へ流出す
るのを防止する軸シール5と、その主駆動軸3の最外部
側に設けられた塵埃などの侵入を防止するダストシール
部材10との間に、オイルポケット11が形成され、軸
シール5からの漏洩油がオイルポケット11の下部に滴
下して滞留する油溜り13が設置され、その油溜りに滞
留した漏洩油の有無あるいは滞留量を検出する検知手段
14が、油溜り13に臨むように配設されていることで
ある。The features of the shaft seal oil leak detection device of the present invention will be explained with reference to FIGS. 1(a) and 1(b).
A shaft seal 5 that prevents the hydraulic oil in the casing from flowing out through the main drive shaft 3 and a dust seal member 10 provided on the outermost side of the main drive shaft 3 that prevents dust from entering. In between, an oil pocket 11 is formed, and an oil reservoir 13 is installed in which leaked oil from the shaft seal 5 drips to the lower part of the oil pocket 11 and remains therein. The detection means 14 for detection is arranged so as to face the oil sump 13.
以下に、本発明をそれが適用される装置の実施例を用い
て詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below using examples of devices to which the present invention is applied.
第2図は一般的な油圧ポンプ1の外観で、ポンプ本体2
には主駆動軸3、軸受4、軸シール5などが設けられて
いる。ポンプ本体2には、本体を閉止しているフランジ
6を貫通した主駆動軸3の先端にカップリング7が取付
けられ、図示しない電動機やエンジンなどの駆動源から
の動力が供給されるようになっている。なお、本体ケー
シングには作動油の吸入口あるいは吐出口8が開口され
、油タンクから汲み上げた作動油を加圧して所定の各油
圧アクチュエータに供給し、その作動によりショベルや
それを支えるアームなどの傾動が行なわれるようになっ
ている。ちなみに、その油圧ポンプの本体2は鎖線で示
すような支持具9でもって、油圧パワーショベルなどの
所定位置に装着される。Figure 2 shows the appearance of a typical hydraulic pump 1, with the pump body 2
is provided with a main drive shaft 3, a bearing 4, a shaft seal 5, etc. A coupling 7 is attached to the pump body 2 at the tip of a main drive shaft 3 that passes through a flange 6 that closes the body, and power is supplied from a drive source such as an electric motor or an engine (not shown). ing. A hydraulic oil inlet or discharge port 8 is opened in the main body casing, and the hydraulic oil pumped up from the oil tank is pressurized and supplied to each predetermined hydraulic actuator. A tilting motion is to be performed. Incidentally, the main body 2 of the hydraulic pump is mounted at a predetermined position on a hydraulic power shovel or the like using a support 9 as shown by the chain line.
第1図(a)は主駆動軸3を軸承する部分の拡大図で、
本体ケーシング内の作動油が主駆動軸3を伝って外部へ
流出するのを防止する軸シール5が、軸受4に隣り合っ
てその外側部に設けられている。この軸シール5は通常
使用されるよく知られたオイルシールなとであって、主
駆動軸3に外嵌され、環状空間に挿入されて内部側のリ
ップ5aの径を縮小させるリング状のコイルスプリング
5Mにより、軸周囲の油密が図られている。一方、主駆
動軸3の最外部側には、塵埃などのケーシング内への侵
入を防止するダストシール部材10が設けられている。FIG. 1(a) is an enlarged view of the part that supports the main drive shaft 3.
A shaft seal 5 that prevents hydraulic oil in the main body casing from flowing out through the main drive shaft 3 is provided adjacent to the bearing 4 on its outer side. This shaft seal 5 is a commonly used and well-known oil seal, and is a ring-shaped coil that is fitted onto the outside of the main drive shaft 3 and inserted into the annular space to reduce the diameter of the inner lip 5a. The spring 5M ensures oil tightness around the shaft. On the other hand, a dust seal member 10 is provided on the outermost side of the main drive shaft 3 to prevent dust from entering the casing.
このダストシール部材と上述の軸シール5との間のケー
シング内に、オイルポケット11が形成されている。こ
のオイルポケットはケーシングに形成された導油路12
に連通され、その導油路の下部先端に、軸シール5から
の漏洩油が滴下して滞留する油溜り13が、第1図(b
)に示すようにケーシング内などに設置されている。な
お、オイルポケット11は軸シール5を越えてダストシ
ール部材10方向に漏出してきた漏洩油を、ケーシング
外に漏洩させることなく、導油路12に導けばよいので
、その形状や寸法はケーシング内の空間的な余裕や軸シ
ール5とダストシール部材10の配置の葦ね合いで、任
意に採ることができる。主駆動軸3のオイルポケット1
1部に鍔状のオイル切りなどが取付けられていると、ダ
ストシール部材10側への漏出をほとんど無くすことが
できて都合がよい。An oil pocket 11 is formed in the casing between this dust seal member and the above-mentioned shaft seal 5. This oil pocket is an oil guide path 12 formed in the casing.
At the lower tip of the oil guide path, there is an oil reservoir 13 in which leaked oil from the shaft seal 5 drips and accumulates, as shown in Figure 1 (b).
), it is installed inside the casing, etc. Note that the oil pocket 11 only needs to guide the leaked oil that has leaked beyond the shaft seal 5 toward the dust seal member 10 to the oil guide path 12 without leaking it outside the casing, so its shape and dimensions are determined according to the inside of the casing. Any arrangement can be made depending on the space available and the arrangement of the shaft seal 5 and dust seal member 10. Oil pocket 1 of main drive shaft 3
It is convenient if a flange-shaped oil cutter or the like is attached to one part, since leakage to the dust seal member 10 side can be almost eliminated.
油溜り13には、そこに滞留した漏洩油の有無あるいは
滞留量の検出手段である近接スイッチ14が臨まされて
いる。これは、例えば図示のようなケーシングに穿設さ
れた孔に嵌るホルダ15に支持され、そのホルダがねじ
式の噛み合いで取付けられる。ホルダ15の先端には近
接スイッチ14の受感部が出ていて、その下に油溜り1
3の油面にフロート16が浮かべられている。近接スイ
ッチ14が磁気式、渦電流式や静電容量式などのもので
あれば、フロート16の上下に磁性板17が貼付される
。なお、その磁性板は上面だけでもよいが、フロート1
6が万一転倒する場合のことを考慮して両面に設けてお
(とよい。そして、油溜り13は図示では比較的浅いが
、車体の揺動などを考慮して深くしておくのが好ましい
。その油溜り13の底部にはプラグ18が取付けられ、
それを外すこにより、必要に応じて滞留した漏洩油を廃
棄できるようになっている。A proximity switch 14, which is a means for detecting the presence or absence of leaked oil stagnant therein or the amount of stagnant oil, faces the oil sump 13. This is supported, for example, by a holder 15 that fits into a hole drilled in the casing as shown, and the holder is attached by threaded engagement. The sensing part of the proximity switch 14 protrudes from the tip of the holder 15, and an oil reservoir 1 is located below it.
A float 16 is floating on the oil surface of 3. If the proximity switch 14 is of a magnetic type, eddy current type, capacitance type, etc., magnetic plates 17 are attached above and below the float 16. Note that the magnetic plate may be used only on the top surface, but the float 1
It is recommended that oil reservoirs 13 be provided on both sides in case the vehicle falls over.Although the oil reservoir 13 is relatively shallow in the illustration, it is recommended to make it deep in consideration of the rocking of the vehicle body. Preferably, a plug 18 is attached to the bottom of the oil reservoir 13,
By removing it, the accumulated leaked oil can be disposed of if necessary.
このような構成の実施例によれば、以下に述べるように
して、軸シール5からの漏洩油の有無の検知やその量の
検出が行なわれる。According to the embodiment having such a configuration, the presence or absence of oil leaking from the shaft seal 5 and the amount thereof are detected as described below.
油圧ポンプ1は作動油を吸入し、主駆動軸3の回転に伴
って吐出口8から高圧油が吐出する。その吸入・圧縮・
吐出の行程において、必ずといつよいほど僅かではある
が油漏れが起こる。その漏洩油は、一旦ケーシング内に
流出してドレンラインあるいは吸入ラインに帰還される
ようになっている。このとき、ライン圧力は大気圧より
高く、主駆動軸3からの油漏れは軸シール5によって防
止される。しかし、長時間の使用によりそのシール性能
が低下したとき、作動油は軸受4を通り軸シール5のリ
ップ5aからオイルポケット11に流出する。その漏出
油は導油路12を経て油溜り13に貯留される。油溜り
にはフロート16が配設されているので、滞留油量に応
じてそれが上昇する。近接スイッチ14の受感部に接近
するフロートの上面に磁性板17が貼付されているので
、ケーブル19の一部を介して供給される電流が変化す
る。それによる電気信号が他のケーブルを介して出力さ
れ、図示しないコントロールユニットなどに伝送される
。磁性板17の接近度合によりその信号に強弱が出るの
で、滞留油量の多少を検出することもできる。なお、近
接スイッチ14が上述した電気的な他の方法による検出
であっても、同様な作動により油量の定性的なオン・オ
フ検知や定量的な検出が行なわれる。The hydraulic pump 1 sucks hydraulic oil, and discharges high-pressure oil from a discharge port 8 as the main drive shaft 3 rotates. Its inhalation, compression,
During the discharge process, oil leakage always occurs, albeit a very small amount. The leaked oil once flows into the casing and is returned to the drain line or suction line. At this time, the line pressure is higher than atmospheric pressure, and oil leakage from the main drive shaft 3 is prevented by the shaft seal 5. However, when the sealing performance deteriorates due to long-term use, the hydraulic oil flows through the bearing 4 and flows out from the lip 5a of the shaft seal 5 into the oil pocket 11. The leaked oil passes through the oil guide path 12 and is stored in the oil reservoir 13. Since a float 16 is disposed in the oil reservoir, it rises in accordance with the amount of retained oil. Since the magnetic plate 17 is attached to the upper surface of the float that approaches the sensing part of the proximity switch 14, the current supplied through a part of the cable 19 changes. The resulting electrical signal is output via another cable and transmitted to a control unit (not shown) or the like. Since the strength of the signal varies depending on the degree of proximity of the magnetic plate 17, it is also possible to detect the amount of retained oil. It should be noted that even if the proximity switch 14 is detected by the other electrical method described above, qualitative on/off detection or quantitative detection of the oil amount is performed in the same manner.
この近接スイッチは、構造がシンプルで可動部がなく、
油量に応じて変動するフロートも単純な形状のものでよ
いので、その検出寿命は極めて長いものとなる。しかも
、手入れがほとんど不要であり、車体の傾斜・揺れ・振
動による誤動作もほとんどなく、その信頼性が飛躍的に
向上する。This proximity switch has a simple structure and no moving parts.
Since the float that changes depending on the amount of oil may have a simple shape, its detection life is extremely long. What's more, it requires almost no maintenance, and there are almost no malfunctions caused by tilting, shaking, or vibration of the vehicle body, dramatically improving its reliability.
第3図は異なる実施例で、検出手段として超音波センサ
20が採用されたものである。このセンサは、発信され
た超音波信号の空気中における透過性が油中に比べて悪
いことを利用したもので、空気中での減衰が大きく対面
壁からの反射波が弱められ、それによって滞留油量が検
出できるようになっている。したがって、センサ面での
油量が増すと反射波量が増加するのである。FIG. 3 shows a different embodiment, in which an ultrasonic sensor 20 is employed as the detection means. This sensor takes advantage of the fact that the transmitted ultrasonic signal has poor permeability in the air compared to oil, and the attenuation in the air is large, weakening the reflected waves from the facing wall and causing the stagnation. The amount of oil can be detected. Therefore, as the amount of oil on the sensor surface increases, the amount of reflected waves increases.
このようにいずれの例においても、検出手段により、軸
シールからの漏洩油の有無や量を自動的かつ遠隔的に検
出することができる。通常、油圧ショベルなどに搭載し
た油圧ポンプの主駆動軸部は狭隘でしかも汚れがひど(
、その目視確認などの点検が困難であるが、その必要も
なくなり、それを搭載した車両の保守作業量を大きく軽
減することができる。As described above, in any of the examples, the presence or absence and amount of oil leaking from the shaft seal can be automatically and remotely detected by the detection means. Normally, the main drive shaft of a hydraulic pump mounted on a hydraulic excavator is narrow and often dirty (
Although visual inspection and other inspections are difficult, this is no longer necessary, and the amount of maintenance work for vehicles equipped with it can be greatly reduced.
本発明は以上の実施例の詳細な説明から判るように、軸
シールとダストシール部材との間にオイルポケットを形
成し、軸シールからの漏洩油をオイルポケットに連通ず
る油溜りに滞留させ、それを検出手段で検出できるよう
にしたので、油圧ポンプの油漏れを事前に知ることがで
き、漏洩による種々のトラブルの発生を解消できる。し
かも、その装置自体の構造が簡単で、保守・点検作業が
不要または軽減され、油圧パワーショベルなど車両全体
でのメンテナンスが容易なものとなる。加えて、その検
出装置は車体の傾き・揺れ・4振動にほとんど影響され
なく、したがって、誤動作や誤信号の発生も回避される
。As can be seen from the detailed description of the embodiments above, the present invention forms an oil pocket between the shaft seal and the dust seal member, causes leaked oil from the shaft seal to stay in an oil reservoir communicating with the oil pocket, and Since this can be detected by the detection means, oil leakage from the hydraulic pump can be known in advance, and various troubles caused by leakage can be avoided. Furthermore, the structure of the device itself is simple, maintenance and inspection work is unnecessary or reduced, and maintenance of the entire vehicle such as a hydraulic power shovel becomes easy. In addition, the detection device is almost unaffected by tilting, shaking, and four vibrations of the vehicle body, thus preventing malfunctions and generation of false signals.
第1図(a)は本発明の軸シールの油漏洩検知装置を装
着した油圧ポンプの要部断面図、第1図(b)は同図(
a)のn−n線矢視断面図、第2図は油圧ポンプの全体
外観図の1例、第3図は異なる実施例の断面図である。
3−主駆動軸、5−軸シール、10・−ダストシール部
材、11−オイルポケット、13−油溜り、14.20
−検出手段(近接スイッチ、超音波センサ)。
代理人 弁理士 吉相 勝俊(ばか1名)第1図(a)
■
9J1図(b)FIG. 1(a) is a sectional view of the main parts of a hydraulic pump equipped with the shaft seal oil leakage detection device of the present invention, and FIG. 1(b) is the same figure (
FIG. 2 is an example of an overall external view of a hydraulic pump, and FIG. 3 is a sectional view of a different embodiment. 3-Main drive shaft, 5-Axis seal, 10-Dust seal member, 11-Oil pocket, 13-Oil reservoir, 14.20
- detection means (proximity switch, ultrasonic sensor); Agent Patent attorney Katsutoshi Yoshiso (one idiot) Figure 1 (a) ■ Figure 9J1 (b)
Claims (1)
出するのを防止する軸シールと、その主駆動軸の最外部
側に設けられた塵埃などの侵入を防止するダストシール
部材との間に、オイルポケットが形成され、 前記軸シールからの漏洩油が前記オイルポケットの下部
に滴下して滞留する油溜りが設置され、その油溜りに滞
留した漏洩油の有無あるいは滞留量を検出する検出手段
が、油溜りに臨むように配設されていることを特徴とす
る軸シールの油漏洩検知装置。(1) Between the shaft seal that prevents the hydraulic oil in the casing from flowing out through the main drive shaft and the dust seal member provided on the outermost side of the main drive shaft that prevents dust from entering. An oil pocket is formed in the shaft seal, and an oil reservoir is installed in which leaked oil from the shaft seal drips and stays at the bottom of the oil pocket, and a detection method is installed to detect the presence or absence of leaked oil accumulated in the oil reservoir or the amount of accumulated oil. An oil leak detection device for a shaft seal, characterized in that the means is arranged so as to face an oil reservoir.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59278979A JPS61159129A (en) | 1984-12-29 | 1984-12-29 | Detecting device for oil leak of shaft seal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59278979A JPS61159129A (en) | 1984-12-29 | 1984-12-29 | Detecting device for oil leak of shaft seal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61159129A true JPS61159129A (en) | 1986-07-18 |
Family
ID=17604732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59278979A Pending JPS61159129A (en) | 1984-12-29 | 1984-12-29 | Detecting device for oil leak of shaft seal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61159129A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2618525A1 (en) * | 1987-07-22 | 1989-01-27 | Hucke Hans | DEVICE FOR PREVENTING LEAKS ON A MECHANICAL APPARATUS COMPRISING A SEALED FLUID CHAMBER, IN PARTICULAR A PUMP |
JPH0360047U (en) * | 1989-10-12 | 1991-06-13 | ||
JP2006138678A (en) * | 2004-11-10 | 2006-06-01 | Sumitomo Chemical Co Ltd | Apparatus equipped with oil leakage detection means |
DE102005051552A1 (en) * | 2005-10-26 | 2007-05-03 | Franz Kessler Gmbh | Leakage monitoring device e.g. for liquid supplying in machine tools, has channel for planned leakage of fluid and leakage liquid detector records level of leakage liquid in tubing |
WO2008120399A1 (en) * | 2007-04-03 | 2008-10-09 | Nok Corporation | Hermetic closure structure |
EP2336743A1 (en) * | 2009-12-17 | 2011-06-22 | Carl Freudenberg KG | Seal arrangement |
CN102288366A (en) * | 2011-05-13 | 2011-12-21 | 青岛开世密封工业有限公司 | Shell-rotation tester for muddy water resistance of sealing ring and testing method thereof |
JP2011256942A (en) * | 2010-06-09 | 2011-12-22 | Aisan Industry Co Ltd | Exhaust gas flow passage valve |
JP2021032381A (en) * | 2019-08-28 | 2021-03-01 | Nok株式会社 | Sealing device and sealing structure |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4967051A (en) * | 1972-11-03 | 1974-06-28 |
-
1984
- 1984-12-29 JP JP59278979A patent/JPS61159129A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4967051A (en) * | 1972-11-03 | 1974-06-28 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2618525A1 (en) * | 1987-07-22 | 1989-01-27 | Hucke Hans | DEVICE FOR PREVENTING LEAKS ON A MECHANICAL APPARATUS COMPRISING A SEALED FLUID CHAMBER, IN PARTICULAR A PUMP |
JPH0360047U (en) * | 1989-10-12 | 1991-06-13 | ||
JP2006138678A (en) * | 2004-11-10 | 2006-06-01 | Sumitomo Chemical Co Ltd | Apparatus equipped with oil leakage detection means |
DE102005051552A1 (en) * | 2005-10-26 | 2007-05-03 | Franz Kessler Gmbh | Leakage monitoring device e.g. for liquid supplying in machine tools, has channel for planned leakage of fluid and leakage liquid detector records level of leakage liquid in tubing |
DE102005051552B4 (en) * | 2005-10-26 | 2009-09-17 | Franz Kessler Gmbh | Leakage monitoring device |
WO2008120399A1 (en) * | 2007-04-03 | 2008-10-09 | Nok Corporation | Hermetic closure structure |
EP2336743A1 (en) * | 2009-12-17 | 2011-06-22 | Carl Freudenberg KG | Seal arrangement |
JP2011256942A (en) * | 2010-06-09 | 2011-12-22 | Aisan Industry Co Ltd | Exhaust gas flow passage valve |
CN102288366A (en) * | 2011-05-13 | 2011-12-21 | 青岛开世密封工业有限公司 | Shell-rotation tester for muddy water resistance of sealing ring and testing method thereof |
JP2021032381A (en) * | 2019-08-28 | 2021-03-01 | Nok株式会社 | Sealing device and sealing structure |
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