CN106698236A - Hydraulic jack piston and upper cover combined sealing structure - Google Patents
Hydraulic jack piston and upper cover combined sealing structure Download PDFInfo
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- CN106698236A CN106698236A CN201510774189.4A CN201510774189A CN106698236A CN 106698236 A CN106698236 A CN 106698236A CN 201510774189 A CN201510774189 A CN 201510774189A CN 106698236 A CN106698236 A CN 106698236A
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Abstract
The invention discloses a hydraulic jack piston and upper cover combined sealing structure. The hydraulic jack piston and upper cover combined sealing structure comprises an outer shell, an oil cylinder, a piston rod, a top cap, an upper cover sealing assembly and a piston sealing assembly. The upper cover sealing assembly comprises a dustproof ring and a guiding sleeve arranged between the top cap and the piston rod. An inner hole in the upper end of the top cap is internally provided with a groove A and a groove B in sequence from top to bottom. The dustproof ring is mounted in the groove A, and the guiding sleeve is mounted in the groove B. The piston sealing assembly is arranged between the oil cylinder and a piston and comprises an upper support ring, a low-expansion-and-contraction sealing ring set and a lower support ring. The upper support ring and the lower support ring are arranged at the two ends of the low-expansion-and-contraction sealing ring set correspondingly. The piston sealing assembly is arranged between the oil cylinder and the piston and comprises a support ring, a Y-shaped sealing ring, a sealing ring and a J-shaped ring; the support ring and the sealing ring are arranged at the upper end and the lower end of the Y-shaped sealing ring correspondingly; and the J-shaped ring is arranged outside the sealing ring and encircles the sealing ring.
Description
Technical field
The present invention relates to the sealing structure of hydraulic jack, particularly a kind of hydraulic jack piston and top cover combination sealing structure.
Background technology
Hydraulic jack is common jacking apparatus in industrial production, the sealing property of its seal member be related to hydraulic jack can normal work key.Its jacking and off-load are that completion is moved up and down in oil cylinder inner wall by piston.The sealing property of its seal member be related to hydraulic jack can normal work key.Its jacking and off-load are that completion is moved up and down in oil cylinder inner wall by piston, are dynamic sealing between piston and oil cylinder, and the sealing property requirement to seal is higher.
The sealing structure of existing hydraulic jack has the following disadvantages：
1st, only with the seal of single type between piston and oil cylinder, dynamic sealing poor-performing, abrasion resistance properties are poor, there is the situation of seal failure after long-time use.
2nd, hydraulic jack is withstood on upper end and is sealed by top cap, and top cap is threaded in the outer rim of cylinder upper end by the internal thread of its endoporus hypomere, and piston rod is located in oil cylinder, upper end from stretched out in oil cylinder and positioned at top cap endoporus epimere in.Existing hydraulic jack, it is provided only between top cap endoporus epimere and piston rod outer rim and is provided with a sealing ring, piston rod is frequently moved up and down when jacking or off-load, sealing ring easy to wear, dust is set to enter in the gap between piston rod and oil cylinder, and piston rod easy deflection due to lacking guiding during moving up and down, and then uneven wear sealing ring.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, and provides a kind of hydraulic jack piston and top cover combination sealing structure.The sealing ring that it is solved between existing hydraulic jack top cap and piston rod is easy to wear, the gap between piston rod and oil cylinder is caused to enter dust, and shortage is oriented between top cap and piston rod, and deflection when causing piston rod to move up and down, and then uneven wear sealing ring；Sealing structure dynamic sealing poor performance between existing hydraulic jack piston and oil cylinder, the short problem of service life.
The technical scheme is that：Hydraulic jack piston and top cover combination sealing structure, including shell, oil cylinder, piston rod and top cap；Oil cylinder is located in shell；Piston rod is located in oil cylinder, its upper end from stretched out in oil cylinder and positioned at top cap upper end endoporus in；Top cap is in the sleeve shaped of both ends open, and its outer rim is provided with annular boss, and its internal thread passed through in the endoporus of lower end is threaded in cylinder upper end outer rim, and the lower ring surface of its annular boss props up shell, for shell provides positioning；
It also includes upper lid seal assembly and piston seal component；
Upper lid seal assembly includes the dust ring and fairlead that are located between top cap and piston rod；Groove A and groove B is sequentially provided with the endoporus of top cap upper end from top to bottom, dust ring is arranged in groove A, and fairlead is arranged in groove B；
Piston seal component is located between oil cylinder and piston, and it includes support ring, y-type seal ring, sealing ring and J-type ring；Support ring and sealing ring are respectively provided at the upper and lower ends of y-type seal ring；J-type ring is located at outside sealing ring, sealing ring is closely encircled including.
Further technical scheme is the present invention:From being sequentially provided with bracket groove and lower groove under on the outer wall of piston；Support ring is sleeved on piston outer wall, and y-type seal ring is arranged in bracket groove, and sealing ring is arranged in lower groove.
Further technical scheme is the present invention:Seal washer is provided between the lower ring surface and shell of top cap annular boss.
The present invention has the following advantages that compared with prior art：
Upper cover sealing structure has the following advantages that：
1st, dust ring is provided between top cap and piston rod, prevents dust from falling into gap between the two.
2nd, fairlead is provided between top cap and piston rod, good guide effect can be played when piston is moved up and down in oil cylinder, prevent piston rod deflections and abradable seal circle.
Piston sealing structure has the following advantages that：
1st, combination sealing performance is good, and seal assembly is small with the frictional resistance of oil cylinder inner wall, and long service life, pressure voltage is high.
2nd, when piston is moved up and down in oil cylinder inner wall, guide ring plays guiding and anti-bias effect to piston, prevents due to piston other seal members of eccentric and uneven wear in moving process.
3rd, " y-type seal ring " forms dual-seal with " J-type ring and sealing ring ", wherein any one resealing fails, another resealing can still ensure hydraulic jack normal work.
Below in conjunction with figure, the invention will be further described with embodiment.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is top cap structural representation；
Fig. 3 is the A-A sectional views of Fig. 2；
Fig. 4 is the structural representation of piston in the present invention；
Fig. 5 is the B-B sectional views of Fig. 4.
Specific embodiment
Embodiment 1：
A kind of hydraulic jack piston and top cover combination sealing structure, including shell 1, oil cylinder 2, piston rod 3, top cap 4, upper lid seal assembly and piston seal component；Oil cylinder 2 is located in shell 1；Piston rod 3 is located in oil cylinder 2, its upper end stretch out in the oil cylinder 2 and positioned at the upper end endoporus of top cap 4 in；Top cap 4 is in the sleeve shaped of both ends open, and its outer rim is provided with annular boss 41, and its internal thread passed through in the endoporus of lower end is threaded in the upper end outer rim of oil cylinder 2, and the lower ring surface of its annular boss 41 props up shell 1, is that shell 1 provides positioning.
Upper lid seal assembly includes the dust ring 5 and fairlead 6 that are located between top cap 4 and piston rod 3；Groove A42 and groove B43 is sequentially provided with the upper end endoporus of top cap 4 from top to bottom, dust ring 5 is arranged in groove A42, and fairlead 6 is arranged in groove B43.Seal washer is provided between the lower ring surface and shell 1 of the annular boss 41 of top cap 4.
Piston seal component is located between oil cylinder 2 and piston 7, and it includes support ring 8, y-type seal ring 9, sealing ring 10 and J-type ring 11；Support ring and sealing ring are respectively provided at the upper and lower ends of y-type seal ring；J-type ring is located at outside sealing ring, sealing ring is closely encircled including.
From being sequentially provided with bracket groove 71 and lower groove 72 under on the outer wall of piston 7；Support ring 8 is sleeved on the outer wall of piston 7, and y-type seal ring 9 is arranged in bracket groove 71, and sealing ring 10 is arranged in lower groove 72.
Seal washer is provided between the lower ring surface and shell 1 of the annular boss 41 of top cap 4.
Claims (3)
1. hydraulic jack piston and top cover combination sealing structure, including shell, oil cylinder, piston rod and top cap；Oil cylinder is located in shell；Piston rod is located in oil cylinder, its upper end from stretched out in oil cylinder and positioned at top cap upper end endoporus in；Top cap is in the sleeve shaped of both ends open, and its outer rim is provided with annular boss, and its internal thread passed through in the endoporus of lower end is threaded in cylinder upper end outer rim, and the lower ring surface of its annular boss props up shell, for shell provides positioning；
It is characterized in that：It also includes upper lid seal assembly and piston seal component；
Upper lid seal assembly includes the dust ring and fairlead that are located between top cap and piston rod；Groove A and groove B is sequentially provided with the endoporus of top cap upper end from top to bottom, dust ring is arranged in groove A, and fairlead is arranged in groove B；
Piston seal component is located between oil cylinder and piston, and it includes support ring, y-type seal ring, sealing ring and J-type ring；Support ring and sealing ring are respectively provided at the upper and lower ends of y-type seal ring；J-type ring is located at outside sealing ring, sealing ring is closely encircled including.
2. hydraulic jack piston as claimed in claim 1 and top cover combination sealing structure, it is characterized in that：From being sequentially provided with bracket groove and lower groove under on the outer wall of piston；Support ring is sleeved on piston outer wall, and y-type seal ring is arranged in bracket groove, and sealing ring is arranged in lower groove.
3. hydraulic jack piston as claimed in claim 2 and top cover combination sealing structure, it is characterized in that：Seal washer is provided between the lower ring surface and shell of top cap annular boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510774189.4A CN106698236A (en) | 2015-11-13 | 2015-11-13 | Hydraulic jack piston and upper cover combined sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510774189.4A CN106698236A (en) | 2015-11-13 | 2015-11-13 | Hydraulic jack piston and upper cover combined sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106698236A true CN106698236A (en) | 2017-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510774189.4A Pending CN106698236A (en) | 2015-11-13 | 2015-11-13 | Hydraulic jack piston and upper cover combined sealing structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN106698236A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2177008Y (en) * | 1993-09-08 | 1994-09-14 | 河北省承德千斤顶总厂 | Sealing device for hydraulic jack |
| CN102278479A (en) * | 2011-05-17 | 2011-12-14 | 成都飞机工业（集团）有限责任公司 | Y-shaped sealing unit |
| CN102633203A (en) * | 2012-04-20 | 2012-08-15 | 常熟通润汽车零部件股份有限公司 | Piston rod sealing device of hydraulic jack |
| CN203667903U (en) * | 2013-11-21 | 2014-06-25 | 浙江亿鹏机械有限公司 | Efficient seal self-locking type oil jack |
-
2015
- 2015-11-13 CN CN201510774189.4A patent/CN106698236A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2177008Y (en) * | 1993-09-08 | 1994-09-14 | 河北省承德千斤顶总厂 | Sealing device for hydraulic jack |
| CN102278479A (en) * | 2011-05-17 | 2011-12-14 | 成都飞机工业（集团）有限责任公司 | Y-shaped sealing unit |
| CN102633203A (en) * | 2012-04-20 | 2012-08-15 | 常熟通润汽车零部件股份有限公司 | Piston rod sealing device of hydraulic jack |
| CN203667903U (en) * | 2013-11-21 | 2014-06-25 | 浙江亿鹏机械有限公司 | Efficient seal self-locking type oil jack |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |