CN203948370U - A kind of piston assembly - Google Patents
A kind of piston assembly Download PDFInfo
- Publication number
- CN203948370U CN203948370U CN201420260647.3U CN201420260647U CN203948370U CN 203948370 U CN203948370 U CN 203948370U CN 201420260647 U CN201420260647 U CN 201420260647U CN 203948370 U CN203948370 U CN 203948370U
- Authority
- CN
- China
- Prior art keywords
- piston
- annular groove
- protuberance
- piston rod
- cylinder body
- 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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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model relates to a kind of piston assembly, comprise cylinder body and be arranged on the piston rod in cylinder body cavity, the end of described piston rod is connected with piston, on the external cylindrical surface of described piston, offer annular groove, in described annular groove, seal ring is installed, the upper end of a madial wall of described annular groove is provided with protuberance.Because there is the protuberance of several millimeters the inner periphery edge at annular groove towards piston rod axis direction, Sealing is subject to back pressure and compresses while being provided with the annular groove inwall of protuberance, owing to being provided with protuberance, cause seal ring to tilt, make between Sealing periphery back and inboard wall of cylinder block often to keep certain interval, effectively prevent back pressure, avoid quite a lot of fluid to gather and the back pressure that causes, due to piston and cylinder body Spielpassung, can also prevent that seal ring from installing annular groove and extruding from the sealing of piston.
Description
Technical field
The utility model relates to hydraulics field, relates in particular to a kind of piston assembly.
Background technique
In engineering machinery, adopt hydraulics more at present, when carrying out to-and-fro motion, adopt oil hydraulic cylinder to drive more.Oil hydraulic cylinder by hydraulic energy change mechanical energy into, the do straight reciprocating motion hydraulic actuator of (or oscillating motion).Its simple in structure, reliable operation.While realizing to-and-fro motion with it, can remove speed reducer from, and there is no drive gap, motion steadily, is therefore used widely in the hydraulic system of various machineries.The pressure reduction on oil hydraulic cylinder ouput force and piston effective area and both sides thereof is directly proportional; Oil hydraulic cylinder is comprised of cylinder barrel and cylinder cap, piston and piston rod, seal arrangement, damping device and venting gas appliance substantially.
In prior art, the in the situation that of reciprocating motion of the pistons, can produce and be pressed, reduce sealing effect, sealing relies on the elastic fluid dynamic pressure effect in the fluid film between piston rod and the contact surface of sealing.Now, due to the existence of elastohydrodynamic lubrication, Sealing more or less can be with some oil films to go out, and sticks to piston rod surface.From sealing effect angle, oil film is thinner, and sealing effect can be better.But from the fretting wear of Sealing and working life angle, certain thickness film lubrication, can reduce frictional force and reduce wear, and improves the working life of Sealing.So rod seal problem, is actually sealing and fretting wear and lubricated contradiction, be difficult to reach the requirement of zero leakage and low friction simultaneously.
Model utility content
The utility model, in order to overcome deficiency of the prior art, provides a kind of piston assembly, can effectively prevent the generation of back pressure, improves sealing effect.
The utility model is to be achieved through the following technical solutions:
A kind of piston assembly, comprise cylinder body and be arranged on the piston rod in cylinder body cavity, the end of described piston rod is connected with piston, on the external cylindrical surface of described piston, offers annular groove, in described annular groove, seal ring is installed, the upper end of a madial wall of described annular groove is provided with protuberance.
As optimal technical scheme of the present utility model, described protuberance is along the axial direction setting of piston rod.
As optimal technical scheme of the present utility model, the length d of the piston rod axis direction of described protuberance is 3-5mm.
As optimal technical scheme of the present utility model, the inwall Spielpassung of described piston and cylinder body is installed.
Compared with prior art, the beneficial effects of the utility model are: because there is the protuberance of several millimeters the inner periphery edge at annular groove towards piston rod axis direction, Sealing is subject to back pressure and compresses while being provided with the annular groove inwall of protuberance, owing to being provided with protuberance, cause seal ring to tilt, make the frequent certain interval that keeps between Sealing periphery back and inboard wall of cylinder block, effectively prevent back pressure, the back pressure of avoiding quite a lot of fluid to gather and causing, due to piston and cylinder body Spielpassung, can also prevent that seal ring from installing annular groove and extruding from the sealing of piston.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1-cylinder body; 2-piston rod; 3-piston; 4-annular groove; 5-seal ring; 6-protuberance.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, Fig. 1 is structural representation of the present utility model.
Described a kind of piston assembly, comprises cylinder body 1 and is arranged on the piston rod 2 in cylinder body cavity, the end of described piston rod 2 is connected with piston 3, on the external cylindrical surface of described piston 3, offer annular groove 4, in described annular groove 4, seal ring 5 is installed, preferably, seal ring 5 is " Y " RunddichtringO.Described piston 3 is installed with the inwall Spielpassung of cylinder body 1, can prevent that seal ring 5 from installing annular groove 4 and extruding from the sealing of piston.
The upper end of one madial wall of described annular groove 4 is provided with protuberance 6, and described protuberance 6 is along the axial direction setting of piston rod 2, towards seal ring 5.
The length d of piston rod 2 axial directions of described protuberance 6 is 3-5mm.Because there is the protuberance of several millimeters the inner periphery edge at annular groove towards piston rod axis direction, Sealing is subject to back pressure and compresses while being provided with the annular groove inwall of protuberance, owing to being provided with protuberance, cause seal ring to tilt, make the frequent certain interval that keeps between Sealing periphery back and inboard wall of cylinder block, effectively prevent back pressure, avoid quite a lot of fluid to gather and the back pressure that causes.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. a piston assembly, comprise cylinder body (1) and be arranged on the piston rod (2) in cylinder body cavity, the end of described piston rod (2) is connected with piston (3), it is characterized in that: on the external cylindrical surface of described piston (3), offer annular groove (4), seal ring (5) is installed in described annular groove (4), and the upper end of a madial wall of described annular groove (4) is provided with protuberance (6).
2. a kind of piston assembly according to claim 1, is characterized in that: described protuberance (6) is along the axial direction setting of piston rod (2).
3. a kind of piston assembly according to claim 2, is characterized in that: the length d of piston rod (2) axial direction of described protuberance (6) is 3-5mm.
4. a kind of piston assembly according to claim 1, is characterized in that: described piston (3) is installed with the inwall Spielpassung of cylinder body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420260647.3U CN203948370U (en) | 2014-05-21 | 2014-05-21 | A kind of piston assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420260647.3U CN203948370U (en) | 2014-05-21 | 2014-05-21 | A kind of piston assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203948370U true CN203948370U (en) | 2014-11-19 |
Family
ID=51890407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420260647.3U Expired - Fee Related CN203948370U (en) | 2014-05-21 | 2014-05-21 | A kind of piston assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203948370U (en) |
-
2014
- 2014-05-21 CN CN201420260647.3U patent/CN203948370U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NING XUAN Free format text: FORMER OWNER: LI FOMEI Effective date: 20141203 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ning Xuan Inventor after: Guo Chao Inventor after: Li Feifei Inventor after: Liu Dandan Inventor before: Li Fomei |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518000 SHENZHEN, GUANGDONG PROVINCE TO: 044000 YUNCHENG, SHAANXI PROVINCE Free format text: CORRECT: INVENTOR; FROM: LI FOMEI TO: NING XUAN GUO CHAO LI FEIFEI LIU DANDAN |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20141203 Address after: 044000 talent exchange center of Hedong East Street, Saline Lake District, Yuncheng, Shanxi Patentee after: Ning Xuan Address before: 518000 Shenzhen, Guangdong, Futian District Li lotus North 36-208 Patentee before: Li Fomei |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20150521 |
|
| EXPY | Termination of patent right or utility model |