JPH03124005U - - Google Patents
Info
- Publication number
- JPH03124005U JPH03124005U JP3380790U JP3380790U JPH03124005U JP H03124005 U JPH03124005 U JP H03124005U JP 3380790 U JP3380790 U JP 3380790U JP 3380790 U JP3380790 U JP 3380790U JP H03124005 U JPH03124005 U JP H03124005U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hole
- cylinder
- sealing device
- hydraulic
- 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
- 238000007789 sealing Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 2
- 230000005489 elastic deformation Effects 0.000 claims 1
- 239000013013 elastic material Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
Landscapes
- Actuator (AREA)
- Sealing Devices (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Description
第１図は本考案による油圧シリンダの密封装置
の一実施例を示した断面図、第２図及び第３図は
上記実施例の要部を示した断面図、第４図は従来
の油圧シリンダの密封装置を示した断面図、第５
図は別の従来の油圧シリンダの密封装置を示した
断面図である。
１……ピストンロツド、２……シリンダヘツド
、３……バツフアリング、３Ａ……バツクリング
、３Ｂ……スライドリング、４……ロツドパツキ
ン、６……シリンダ圧力室、１１……第１の側面
、１２……第２の側面、１３……貫通孔、１４…
…オリフイス部。
Fig. 1 is a sectional view showing an embodiment of a hydraulic cylinder sealing device according to the present invention, Figs. 2 and 3 are sectional views showing essential parts of the above embodiment, and Fig. 4 is a conventional hydraulic cylinder. 5th cross-sectional view showing the sealing device of
The figure is a sectional view showing another conventional sealing device for a hydraulic cylinder. DESCRIPTION OF SYMBOLS 1... Piston rod, 2... Cylinder head, 3... Buffer ring, 3A... Back ring, 3B... Slide ring, 4... Rod packing, 6... Cylinder pressure chamber, 11... First side surface, 12... Second side surface, 13... Through hole, 14...
...orifice section.
Claims (1)
されたロツドパツキンと、シリンダ圧力室と上記
ロツドパツキンとの間に位置するように上記シリ
ンダヘツドに刻設された環状溝内に配置され、外
周側の弾性材料製のバツクリングと内周側のスラ
イドリングとから構成されたバツフアリングとを
具備し、上記シリンダヘツドとピストンロツドと
の間を密封する油圧シリンダの密封装置において
、上記バツクリングは上記ロツドパツキン側の第
１の側面と上記シリンダ圧力室側の第２の側面と
の間を貫通する貫通孔を有し、この貫通孔の少な
くとも一部にオリフイス部が形成され、上記オリ
フイス部は上記第１の側面側の油圧と上記第２の
側面側の油圧との差圧によつて弾性変形され、こ
の弾性変形により逆止め弁として機能し、上記第
１の側面側の油圧が上記第２の側面側の油圧より
も高圧である時に上記貫通孔を介して圧油の流通
を許容し、低圧である時に上記流通を阻止するこ
とを特徴とする油圧シリンダの密封装置。 ２ 上記オリフイス部は中心に小径のオリフイス
が形成されるように上記貫通孔壁面から上記貫通
孔中心軸に向けて突出しかつ上記第２の側面の方
に傾斜した突出部によつて構成されることを特徴
とする請求項１記載の油圧シリンダの密封装置。[Claims for Utility Model Registration] 1. A rod packing disposed in an annular groove carved in the cylinder head, and an annular groove carved in the cylinder head so as to be located between the cylinder pressure chamber and the rod packing. A sealing device for a hydraulic cylinder that seals between the cylinder head and the piston rod, the sealing device comprising a buffer ring disposed inside the cylinder head and made of an elastic material on the outer peripheral side and a slide ring on the inner peripheral side. The back ring has a through hole penetrating between a first side surface on the rod packing side and a second side surface on the cylinder pressure chamber side, an orifice portion is formed in at least a portion of the through hole, and the orifice portion is formed in at least a portion of the through hole. is elastically deformed by the differential pressure between the hydraulic pressure on the first side surface side and the hydraulic pressure on the second side surface side, and functions as a check valve due to this elastic deformation, so that the hydraulic pressure on the first side surface side is A sealing device for a hydraulic cylinder, characterized in that the pressure oil is allowed to flow through the through hole when the pressure is higher than the oil pressure on the second side surface side, and the flow is blocked when the pressure is low. 2. The orifice portion is constituted by a protrusion that protrudes from the wall surface of the through-hole toward the central axis of the through-hole and is inclined toward the second side surface so that a small-diameter orifice is formed at the center. The sealing device for a hydraulic cylinder according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3380790U JPH03124005U (en) | 1990-03-30 | 1990-03-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3380790U JPH03124005U (en) | 1990-03-30 | 1990-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03124005U true JPH03124005U (en) | 1991-12-17 |
Family
ID=31537753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3380790U Pending JPH03124005U (en) | 1990-03-30 | 1990-03-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03124005U (en) |
-
1990
- 1990-03-30 JP JP3380790U patent/JPH03124005U/ja active Pending
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