CN2224946Y - Pressure self-compensating and floating sealing unit of hydraulic cylinder - Google Patents
Pressure self-compensating and floating sealing unit of hydraulic cylinder Download PDFInfo
- Publication number
- CN2224946Y CN2224946Y CN 95230717 CN95230717U CN2224946Y CN 2224946 Y CN2224946 Y CN 2224946Y CN 95230717 CN95230717 CN 95230717 CN 95230717 U CN95230717 U CN 95230717U CN 2224946 Y CN2224946 Y CN 2224946Y
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- CN
- China
- Prior art keywords
- seal ring
- seal
- hydraulic cylinder
- pressure
- groove
- 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 - Fee Related
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- Sealing Devices (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model relates to a seal device of hydraulic cylinder. The utility model is characterized in that the width and the depth of the grooves of seal rings are greater than that of the section of the seal rings. The position of floating is formed in the grooves. An oil tunnel communicated with the grooves is arranged on the end of the pistons. The seal device is provided with the function of self-compensation of pressure. Thus, the utility model has the advantages of simple assemble, reliability of seal performance, long service life of seal rings, etc.
Description
The utility model relates to hydraulic equipment, particularly a kind of hydraulic cylinder sealing device with pressure self compensation function.
The general traditional seal arrangement of oil hydraulic cylinder is to place pistons end annular groove middle section to become the rubber seal of different shape, the shape and size of its groove and the shape and size of seal ring are basic identical, the inner edge of seal ring abuts against on the bottom surface of groove, leans on the magnitude of interference of the relative cylinder diameter of seal ring external diameter to make the two compress the hydraulic seal effect of playing mutually.The shortcoming of the seal arrangement of this structure is: because seal ring is to realize sealing by the tight power of giving between self and inboard wall of cylinder block, reach designing requirement for guaranteeing sealing, the magnitude of interference of seal ring is generally bigger, and this assembling that just makes seal ring is difficulty relatively; The pressure that seal ring is packed between back and casing wall is initially bigger, sealing is better, but by reason of heavy pressure, frictional force is big, makes ring wear fast, continuous wearing and tearing along with seal ring, sealability also constantly descends, and causes seal ring shorter working life, and the rubber seal of some hydraulic equipment must be changed less than two or three months continuous service time, not only cause hydraulic pressure spare parts consumption amount big, and increased equipment stopping production maintenance frequency.
The purpose of this utility model is improved above-mentioned hydraulic cylinder sealing device, and a kind of hydraulic cylinder sealing device with pressure self compensation function is provided, and makes it to have advantages such as assembling is simple and easy, sealability reliable, long service life.
The utility model is realized by following measure: make the width of annular groove of seal ring and the degree of depth respectively greater than the width and the thickness in seal ring cross section, thereby make seal ring unsettled quick condition that is in groove; Simultaneously be provided with oil through road with groove UNICOM at pistons end.
Oil hydraulic cylinder adopts the seal arrangement of said structure, pressure oil enters in the o-ring groove by the oil through road of pistons end during operation, because the seal ring external diameter is slightly larger than cylinder diameter, the each point that pressure oil can not be contacted with inboard wall of cylinder block by seal ring, and its pressure is evenly passed to seal ring along the front and the bottom of seal ring, and the contact pressure that reaches between seal ring outer periphery and inboard wall of cylinder block between seal ring back and trenched side-wall is increased, oil pressure is high more, contact pressure is big more, and sealability is good more; Because seal ring mainly relies on oil pressure to compress casing wall, so the magnitude of interference of seal ring needn't be too big, seal ring gives and places groove to become compressible state of suspension in addition, and it is extremely easy to make that seal ring assembles in cylinder body; Along with the prolongation of service time, even the wearing and tearing of seal ring external diameter diminish,, still can guarantee its sealability as long as oil pressure can be pressed on it on casing wall in its elastic range, therefore, and the seal arrangement of this structure, its seal ring can obviously prolong working life.As use this seal arrangement on the jack hydraulic cylinder of 45R rotary drill made in U.S.A, seal ring can improve 3-5 times working life, and use can be for a year and a half continuously; On the 540 automobile gearbox hydraulic pressure installation of shellfish made in CCCP Lars, use this seal arrangement, can improve 3 times the working life of cushion rubber, reach 15 months service time continuously.
Accompanying drawing provides two embodiments of the present utility model.
The utility model hydraulic cylinder sealing device both can be used for piston seal, also can be used for the sealing of axle, and the latter just is opened in the o-ring groove of same structure on the envelope body of axostylus axostyle.
The hydraulic cylinder sealing device of the utility model structure both had been applicable to large hydraulic equipment, also was applicable to small-sized hydraulic equipment, because simple in structure, also can use even cylinder diameter is the oil hydraulic cylinder of φ 10.
Claims (3)
1, a kind of hydraulic cylinder sealing device, constitute by seal ring (5) and groove (2) thereof, it is characterized in that the wide end of said groove (2) and the degree of depth be respectively greater than the width and the thickness in said seal ring cross section, be provided with oil through road (3) with said groove UNICOM at pistons end.
As the said hydraulic cylinder sealing device of claim 1, it is characterized in that 2, the cross section of said seal ring is the O type.
As the said hydraulic seal device of claim 1, it is characterized in that 3, the cross section of said seal ring is a rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95230717 CN2224946Y (en) | 1995-04-04 | 1995-04-04 | Pressure self-compensating and floating sealing unit of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95230717 CN2224946Y (en) | 1995-04-04 | 1995-04-04 | Pressure self-compensating and floating sealing unit of hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2224946Y true CN2224946Y (en) | 1996-04-17 |
Family
ID=33875496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95230717 Expired - Fee Related CN2224946Y (en) | 1995-04-04 | 1995-04-04 | Pressure self-compensating and floating sealing unit of hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2224946Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889388A (en) * | 2012-10-19 | 2013-01-23 | 东北石油大学 | Self-adapted sealing device of piston of hydraulic cylinder |
| CN103047413A (en) * | 2011-10-13 | 2013-04-17 | 罗伯特·博世有限公司 | Air piston |
| CN114526226A (en) * | 2022-01-26 | 2022-05-24 | 湖南新方邦环保科技有限公司 | Dynamic self-adjusting self-compensating piston assembly and hydraulic slurry pump |
-
1995
- 1995-04-04 CN CN 95230717 patent/CN2224946Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047413A (en) * | 2011-10-13 | 2013-04-17 | 罗伯特·博世有限公司 | Air piston |
| CN102889388A (en) * | 2012-10-19 | 2013-01-23 | 东北石油大学 | Self-adapted sealing device of piston of hydraulic cylinder |
| CN102889388B (en) * | 2012-10-19 | 2014-12-17 | 东北石油大学 | Self-adapted sealing device of piston of hydraulic cylinder |
| CN114526226A (en) * | 2022-01-26 | 2022-05-24 | 湖南新方邦环保科技有限公司 | Dynamic self-adjusting self-compensating piston assembly and hydraulic slurry pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |