JPS627029Y2 - - Google Patents
Info
- Publication number
- JPS627029Y2 JPS627029Y2 JP1981118476U JP11847681U JPS627029Y2 JP S627029 Y2 JPS627029 Y2 JP S627029Y2 JP 1981118476 U JP1981118476 U JP 1981118476U JP 11847681 U JP11847681 U JP 11847681U JP S627029 Y2 JPS627029 Y2 JP S627029Y2
- Authority
- JP
- Japan
- Prior art keywords
- ring
- shaped packing
- packing
- pressure
- fluid pressure
- 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
- 238000012856 packing Methods 0.000 claims description 63
- 238000007789 sealing Methods 0.000 claims description 15
- 229920003002 synthetic resin Polymers 0.000 claims description 9
- 239000000057 synthetic resin Substances 0.000 claims description 9
- 229920003051 synthetic elastomer Polymers 0.000 claims description 7
- 239000005061 synthetic rubber Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 description 33
- 230000000694 effects Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Description
【考案の詳細な説明】
本考案は油圧シリンダの二重シール構造のシー
ル装置に関するものである。[Detailed Description of the Invention] The present invention relates to a seal device having a double seal structure for a hydraulic cylinder.
従来油圧シリンダのロツドのシールには二重シ
ール構造のシールが使用されているが、第１図に
示すように合成ゴム等で製造されたＵ型パツキン
グ１を溝２に装着したパツキング装置の高圧側即
ちＡ側に四弗化エチレン樹脂等の合成樹脂製のリ
ング３に合成ゴム等のリング４を嵌装して組合せ
たリング状パツキング５を溝６に装着した構造を
有する。高い流体圧力が高圧側Ａから作用したと
き、リング状パツキング５は高圧力を緩和しなが
らＵ型パツキング１およびリング状パツキング５
の間の流体に緩和された圧力を伝え、さらに低圧
側即ちＢ側のＵ型パツキング１がその緩和された
流体圧力をシールするものであるが、高圧力を受
けて往復摺動を繰返していると、次第にＵ型パツ
キング１とリング状パツキング５の間の空間の流
体圧力が上昇し、高圧側が減圧してもＵ型パツキ
ング１とリング状パツキング５間の流体圧力は減
圧した高圧側Ａに逃げないので、Ｕ型パツキング
１とリング状パツキング５の間に溜つた高い流体
圧力により常に相手摺動面７に押付けられた状態
で摺動するので、摩擦抵抗が増大し著しく摩耗す
るのでシール装置の寿命を短くしていた。 Conventionally, a seal with a double seal structure has been used for the rod seal of a hydraulic cylinder. It has a structure in which a ring-shaped packing 5, which is a combination of a ring 3 made of synthetic resin such as tetrafluoroethylene resin and a ring 4 made of synthetic rubber, is fitted into a groove 6 on the A side, that is, on the A side. When high fluid pressure is applied from the high pressure side A, the ring-shaped packing 5 relieves the high pressure while the U-shaped packing 1 and the ring-shaped packing 5
In addition, the U-shaped packing 1 on the low pressure side, that is, the B side, seals the relieved fluid pressure, but it repeatedly slides back and forth in response to high pressure. Then, the fluid pressure in the space between the U-shaped packing 1 and the ring-shaped packing 5 gradually increases, and even if the pressure on the high-pressure side is reduced, the fluid pressure between the U-shaped packing 1 and the ring-shaped packing 5 escapes to the reduced pressure side A. Because of this, the high fluid pressure accumulated between the U-shaped packing 1 and the ring-shaped packing 5 causes the seal device to slide constantly being pressed against the mating sliding surface 7, resulting in increased frictional resistance and significant wear. It was shortening my lifespan.
また第２図に示すように低圧側ＢにＵ型パツキ
ング１を溝２内に装着したパツキング装置の高圧
側Ａに設けた溝６に耐摩耗性および耐圧力性の大
きい四弗化エチレン樹脂等の合成樹脂製の高圧側
の側面８に切欠９を有するリング状パツキング１
０を装着した構造を有するが、高圧側Ａから衝撃
的に高い流体圧力が作用したときは、リング状パ
ツキング１０は相手摺動面７に接してシールし、
また高圧側Ａが減圧したときには溝６の側面１２
にリング状パツキング１０の側面８が接触し、Ｕ
型パツキング１とリング状パツキング１０の間に
式つた高い流体圧力は、切欠き９を通つて高圧側
Ａに逃げるので流体圧力は低下し、摺動によるＵ
型パツキング１の摩耗を減少する。しかるに、高
圧側Ａから高い流体圧力が作用したとき、耐摩耗
性および耐圧力性の大きい合成樹脂製のリング状
パツキング１０は衝撃的な高い流体圧力に対して
はシールするが、持続する高い流体圧力に対して
はシールが十分でなく、Ｕ型パツキング１とリン
グ状パツキング１０間の空間は次第に高くなる流
体圧力により相手摺動面７に圧しつけられて摩擦
抵抗が増大し摩耗するのでシール装置の寿命を短
かくしていた。 In addition, as shown in Fig. 2, a U-shaped packing 1 is installed in the groove 2 on the low-pressure side B of the packing device, and a groove 6 provided on the high-pressure side A is filled with tetrafluoroethylene resin, which has high wear resistance and pressure resistance. Ring-shaped packing 1 made of synthetic resin and having a notch 9 on the high-pressure side side 8
0, but when a shockingly high fluid pressure is applied from the high pressure side A, the ring-shaped packing 10 contacts and seals the mating sliding surface 7,
Also, when the pressure on the high pressure side A is reduced, the side surface 12 of the groove 6
The side surface 8 of the ring-shaped packing 10 comes into contact with the U
The high fluid pressure generated between the mold packing 1 and the ring-shaped packing 10 escapes to the high pressure side A through the notch 9, so the fluid pressure decreases and the U due to sliding
Reduces wear on mold packing 1. However, when high fluid pressure is applied from the high-pressure side A, the ring-shaped packing 10 made of synthetic resin with high wear resistance and pressure resistance seals against the shockingly high fluid pressure, but the sustained high fluid pressure The sealing device is not strong enough to withstand the pressure, and the space between the U-shaped packing 1 and the ring-shaped packing 10 is pressed against the mating sliding surface 7 by the gradually increasing fluid pressure, increasing frictional resistance and causing wear. It was shortening the lifespan of.
本考案は高圧側Ａから高い流体圧力が作用した
とき、二重シール構造の２つのパツキング装置の
間の空間に流体圧力が溜らないようにし、高圧側
Ａが減圧されたとき、二重シール構造の２つのパ
ツキング装置間の空間の流体圧力が減圧した高圧
側Ａに通ずるようにしたシール効果の優れた寿命
の長いシール装置を提供するものである。本考案
の一実施例を第３図〜第７図により説明する。第
３図および第４図はリング状パツキング１３を示
す図であり、側面１４に４個の切欠き１５を有す
る耐摩、耐圧性の大きい合成樹脂製のリング１６
に外周１７および側面１８にそれぞれ４個の切欠
き１９および２０を有する合成ゴム製のリング２
１を嵌装組合せたものである。リング２１は内周
に円周切欠き２２を有し、リング１６の切欠き１
５とリング２１の切欠き１９および２０の位置が
重ならないで、ずれた場合にも流体圧力が通じる
ようになつている。 This invention prevents fluid pressure from accumulating in the space between the two packing devices with a double seal structure when high fluid pressure is applied from the high pressure side A, and when the pressure on the high pressure side A is reduced, the double seal structure To provide a sealing device with an excellent sealing effect and a long life in which the fluid pressure in the space between the two packing devices is communicated to the reduced pressure high pressure side A. An embodiment of the present invention will be described with reference to FIGS. 3 to 7. 3 and 4 are diagrams showing the ring-shaped packing 13, in which a ring 16 made of a synthetic resin with high wear resistance and pressure resistance has four notches 15 on the side surface 14.
A synthetic rubber ring 2 having four notches 19 and 20 on the outer periphery 17 and on the side surfaces 18, respectively.
1 is fitted and combined. The ring 21 has a circumferential notch 22 on its inner periphery, and the notch 1 of the ring 16
5 and the notches 19 and 20 of the ring 21 do not overlap, but fluid pressure can be communicated even if they are misaligned.
第５図は油圧シリンダにリング状パツキング１
３を装着したものである。端蓋２３には、内周面
２３ａの溝２内に設けたＵ型パツキング１の内方
の溝６内にリング状パツキング１３が嵌装されて
いる。２４はピストンロツドである。またピスト
ン２５にはそれぞれ外周面２５ａの溝６内にＵ型
パツキング１を設け、その外方にそれぞれ溝６内
にリング状パツキング１３が嵌装されている。第
６図および第７図において、溝２に設けられたＵ
型パツキング１の内方の溝６内にリング状パツキ
ング１３が嵌装され、高圧側をＡおよび低圧側ま
たは大気側をＢとする。高い流体圧力が高圧側Ａ
に加えられると、リング状パツキング１３の側面
２６は、溝６の側面２７に接触し、リング状パツ
キング１３の耐摩、耐圧性の大なる合成樹脂製の
リング１６の内周面２８はピストンロツド２４の
摺動面２９と接触し、合成ゴム製リング２１はリ
ング１６の内周面２８を押圧するので、衝撃的な
高い流体圧力のみでなく、持続する高い流体圧力
に対してもシールし、繰返し作動が行なわれて
も、緩衝された流体圧力が、大気側ＢのＵ型パツ
キング１とリング状パツキング１３の間に溜るの
みである。また高圧側Ａが低い流体圧力になつた
とき、Ｕ型パツキング１とリング状パツキング１
３との間の流体圧力が高いと、リング状パツキン
グ１３は高圧側Ａの方向に移動して、リング１６
およびリング２１の側面１４および１８は溝６の
側面３０に接触し、圧力流体は溝６からリング状
パツキング１３のリング２１の切欠き１９および
２０さらにリング１６の切欠き１５を通り、低い
流体圧力を有する高圧側Ａに逃げる。したがつて
高圧シリンダの使用中Ｕ型パツキング１とリング
状パツキング１３との間には緩衝された流体圧力
のみであるから、パツキングと摺動面には高い流
体圧力が加わらないので、パツキングの摩耗が少
なくシール装置の寿命を長くすることができる。
ピストン２５の外周の両側に設けたＵ型パツキン
グ１のそれぞれ外方に設けたリング状パツキング
１３についても、その作動は上記と全く同一なの
で省略する。第８図〜第１０図は本考案の他の実
施例を示す。リング状パツキング３１は、第１実
施例と同一の合成樹脂製のリング１６で側面１４
に４個の切欠き１５を有するが、外周３２および
側面３３に各４個の切欠き３４をおよび３５を有
し、さらに外周３２より溝６の外周面３６より僅
かに突出する突起３７を有する合成ゴム製リング
３８を拒装し組合せたものであり、内周の円周切
欠き３９および側面４０を有する。第１実施例の
リング状パツキング１３とは外周３２に溝６の外
周面３６に接する突起３７を設けたことが異なる
のみである。 Figure 5 shows ring-shaped packing 1 on the hydraulic cylinder.
3 is installed. A ring-shaped packing 13 is fitted into the inner groove 6 of the U-shaped packing 1 provided in the groove 2 of the inner circumferential surface 23a of the end cover 23. 24 is a piston rod. Further, each piston 25 is provided with a U-shaped packing 1 in a groove 6 on an outer circumferential surface 25a, and a ring-shaped packing 13 is fitted in each groove 6 on the outside thereof. In FIGS. 6 and 7, the U provided in the groove 2
A ring-shaped packing 13 is fitted into the inner groove 6 of the mold packing 1, and the high pressure side is designated A and the low pressure side or atmospheric side is designated B. High fluid pressure is on high pressure side A
, the side surface 26 of the ring-shaped packing 13 contacts the side surface 27 of the groove 6 , and the inner circumferential surface 28 of the ring 16 made of synthetic resin with high wear and pressure resistance of the ring-shaped packing 13 contacts the side surface 27 of the groove 6 . In contact with the sliding surface 29, the synthetic rubber ring 21 presses against the inner circumferential surface 28 of the ring 16, so it seals not only against shocking high fluid pressure but also against sustained high fluid pressure, and can be operated repeatedly. Even if this is done, the buffered fluid pressure only remains between the U-shaped packing 1 and the ring-shaped packing 13 on the atmospheric side B. Also, when the fluid pressure on the high pressure side A becomes low, the U-shaped packing 1 and the ring-shaped packing 1
3, the ring-shaped packing 13 moves in the direction of the high pressure side A, and the ring 16
and the side surfaces 14 and 18 of the ring 21 contact the side surfaces 30 of the groove 6, and the pressure fluid passes from the groove 6 through the notches 19 and 20 of the ring 21 of the annular packing 13 and through the notch 15 of the ring 16, at a low fluid pressure. escapes to the high pressure side A, which has a Therefore, when the high-pressure cylinder is in use, there is only buffered fluid pressure between the U-shaped packing 1 and the ring-shaped packing 13, so high fluid pressure is not applied to the packing and the sliding surface, which prevents wear of the packing. The life of the sealing device can be extended.
The ring-shaped packings 13 provided on the outer sides of the U-shaped packings 1 provided on both sides of the outer periphery of the piston 25 are also omitted because their operations are exactly the same as described above. 8 to 10 show other embodiments of the present invention. The ring-shaped packing 31 is the same synthetic resin ring 16 as in the first embodiment, and is attached to the side surface 14.
It has four notches 15 on the outer periphery 32 and the side surface 33, and has four notches 34 and 35 on each of the outer periphery 32 and the side surface 33, and further has a protrusion 37 that slightly protrudes from the outer periphery 32 than the outer circumferential surface 36 of the groove 6. It is a combination of a synthetic rubber ring 38 and has a circumferential notch 39 on the inner periphery and a side surface 40. The only difference from the ring-shaped packing 13 of the first embodiment is that a projection 37 is provided on the outer periphery 32 in contact with the outer peripheral surface 36 of the groove 6.
その作動は第１実施例のシール装置とほぼ同様
であるが、本実施例においては、外周３２より突
出する突起３７を有するので、高圧側Ａが高い流
体圧力になつたとき、シール効果が良好であり、
また高圧側Ａが低い流体圧力になると、大気側Ｂ
のＵ型パツキング１とリング状パツキング３１と
の間の流体圧力がある一定の流体圧力になつてい
るときのみ、リング状パツキング３１は第１０図
の状態となり、リング１６およびリング３８の側
面１４および３３は溝６の側面３０に接触し、流
体はリング３８の切欠き３４を通り、突起３７を
下方に押圧して切欠き３５およびリング１６の切
欠き１５を通り、低い流体圧力の高圧側Ａに逃げ
る。したがつてパツキングと摺動面には高い流体
圧力が加えられないので、パツキングの摩耗が少
なく、シール装置の寿命を長くすることができ
る。本実施例においては油圧シリンダの端蓋に本
考案のシール装置を用いた場合について説明した
がピストンに使用した場合も全く同一である。ま
たリング１６の切欠き１５とリング３８の切欠き
３４および３８が重ならない場合においても圧力
流体が通るようにリング３８の内周に円周切欠き
３９を設けてある。 Its operation is almost the same as the sealing device of the first embodiment, but in this embodiment, since it has a protrusion 37 that protrudes from the outer periphery 32, the sealing effect is good when the high pressure side A becomes high fluid pressure. and
Also, when the fluid pressure on the high pressure side A becomes low, the atmospheric side B
Only when the fluid pressure between the U-shaped packing 1 and the ring-shaped packing 31 reaches a certain level, the ring-shaped packing 31 will be in the state shown in FIG. 33 contacts the side surface 30 of the groove 6, the fluid passes through the notch 34 of the ring 38, presses the protrusion 37 downward, passes through the notch 35 and the notch 15 of the ring 16, and the fluid passes through the notch 34 of the ring 38 and the high pressure side A of the lower fluid pressure. run away to Therefore, high fluid pressure is not applied to the packing and the sliding surface, so the packing is less worn and the life of the sealing device can be extended. In this embodiment, a case has been described in which the sealing device of the present invention is used in the end cap of a hydraulic cylinder, but the case where it is used in a piston is exactly the same. Further, a circumferential notch 39 is provided on the inner periphery of the ring 38 so that the pressure fluid can pass therethrough even when the notch 15 of the ring 16 and the notches 34 and 38 of the ring 38 do not overlap.
なお実施例においては低圧側にＵ型パツキング
を使用したが合成ゴム製パツキング等のパツキン
グを用いても同様な効果を有する。 Although U-shaped packing was used on the low-pressure side in the embodiment, the same effect can be obtained by using packing such as synthetic rubber packing.
以上に記述するように本考案はシール効果にお
いて優れ、摩耗が少なくシール装置の寿命を大幅
に延長させることができる。 As described above, the present invention has excellent sealing effects, reduces wear, and can significantly extend the life of the sealing device.
第１図および第２図は従来のシール装置の縦断
面図、第３図はリング状パツキングの正面図、第
４図は第３図の断面図、第５図は油圧シリンダの
縦断面図、第６図および第７図はシール装置の縦
断面図、第８図および第９図は他のリング状パツ
キングの正面図、および背面図、第１０図は第８
図の断面図、第１１図はシール装置の縦断面図で
ある。
１……Ｕ型パツキング、１３，３１……リング
状パツキング、１４，１８，３３………側面、１
５，１９，２０，３４，３５……切欠き、１６…
…硬質合成樹脂製リング、１７，３２……外周、
２１，３８……合成ゴム製リング、２３……端
蓋、２３ａ……内周面、２５……ピストン、２５
ａ……外周面。
1 and 2 are longitudinal sectional views of a conventional sealing device, FIG. 3 is a front view of a ring-shaped packing, FIG. 4 is a sectional view of FIG. 3, and FIG. 5 is a longitudinal sectional view of a hydraulic cylinder. 6 and 7 are longitudinal sectional views of the sealing device, FIGS. 8 and 9 are front and rear views of other ring-shaped packings, and FIG. 10 is a longitudinal sectional view of the sealing device.
FIG. 11 is a longitudinal sectional view of the sealing device. 1... U-shaped packing, 13, 31... Ring-shaped packing, 14, 18, 33... Side, 1
5, 19, 20, 34, 35...notch, 16...
...Hard synthetic resin ring, 17, 32...Outer periphery,
21, 38...Synthetic rubber ring, 23...End cover, 23a...Inner peripheral surface, 25...Piston, 25
a...Outer peripheral surface.
Claims (1)
ングを装着した油圧シリンダにおいて、前記パツ
キングの内方または外方に、複数個の切欠きを側
面に有する合成樹脂製リングを設け、この合成樹
脂製リング上に、外周および側面にそれぞれ複数
個の切欠きを有する合成ゴム製リングを嵌装した
リング状パツキングを装着したことを特徴とする
油圧シリンダのシール装置。 In a hydraulic cylinder in which a packing is attached to the inner circumferential surface of the end cover or the outer circumferential surface of the piston, a synthetic resin ring having a plurality of notches on the side surface is provided inside or outside the packing, and the synthetic resin ring is A sealing device for a hydraulic cylinder, characterized in that a ring-shaped packing is mounted on the ring, in which a synthetic rubber ring having a plurality of notches on the outer periphery and the side surface is fitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981118476U JPS5824561U (en) | 1981-08-10 | 1981-08-10 | Hydraulic cylinder sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981118476U JPS5824561U (en) | 1981-08-10 | 1981-08-10 | Hydraulic cylinder sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5824561U JPS5824561U (en) | 1983-02-16 |
| JPS627029Y2 true JPS627029Y2 (en) | 1987-02-18 |
Family
ID=29912596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981118476U Granted JPS5824561U (en) | 1981-08-10 | 1981-08-10 | Hydraulic cylinder sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5824561U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH071567Y2 (en) * | 1990-09-17 | 1995-01-18 | 甲南電機株式会社 | Sealing device for solenoid valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50109350A (en) * | 1974-02-12 | 1975-08-28 | ||
| JPS53123751A (en) * | 1977-04-05 | 1978-10-28 | Kobe Steel Ltd | Buffering provided at rod sealing portion of oil pressure cylinder |
| JPS5812707B2 (en) * | 1977-12-19 | 1983-03-09 | 富士電気化学株式会社 | sealed battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5812707U (en) * | 1981-07-20 | 1983-01-26 | カヤバ工業株式会社 | Sealing structure in hydraulic cylinders |
-
1981
- 1981-08-10 JP JP1981118476U patent/JPS5824561U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50109350A (en) * | 1974-02-12 | 1975-08-28 | ||
| JPS53123751A (en) * | 1977-04-05 | 1978-10-28 | Kobe Steel Ltd | Buffering provided at rod sealing portion of oil pressure cylinder |
| JPS5812707B2 (en) * | 1977-12-19 | 1983-03-09 | 富士電気化学株式会社 | sealed battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5824561U (en) | 1983-02-16 |
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