CN103174699B - A kind of servo hydraulic oil cylinder - Google Patents
A kind of servo hydraulic oil cylinder Download PDFInfo
- Publication number
- CN103174699B CN103174699B CN201310064013.0A CN201310064013A CN103174699B CN 103174699 B CN103174699 B CN 103174699B CN 201310064013 A CN201310064013 A CN 201310064013A CN 103174699 B CN103174699 B CN 103174699B
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- Prior art keywords
- oil
- guide sleeve
- sealing
- piston rod
- hole
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- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 56
- 239000003921 oil Substances 0.000 claims abstract description 160
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 239000002783 friction material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 description 13
- 230000003068 static effect Effects 0.000 description 9
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 244000273618 Sphenoclea zeylanica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The invention discloses a kind of servo hydraulic oil cylinder, comprising: cylinder body, outer surface is provided with the first oil leak hole, the first oil hole that communicate with inner chamber of cylinder block; Piston, is built in inner chamber of cylinder block and can does axially reciprocating, inner chamber of cylinder block being separated into independently two-part; Piston rod, is fixed on piston, and its two ends pass the two ends of cylinder body respectively; A pair guide sleeve, be located at cylinder body two ends and wear on the piston rod, be provided with the second oil hole and the second oil leak hole, the second oil hole communicates with the first oil hole, second oil leak hole communicates with the first oil leak hole, forms oil sealing surface between the inwall of guide sleeve and piston rod outer surface; First Sealing, be located between the outer surface of piston rod and guide sleeve inwall, the first Sealing and inner chamber of cylinder block separate by oil sealing surface.A kind of servo hydraulic oil cylinder of the present invention has the wearing and tearing that can effectively reduce between piston rod and guide sleeve, can realize stable sealing again, the advantage that working life is longer.
Description
Technical field
The present invention relates to a kind of hydraulic jack, particularly a kind of servo hydraulic oil cylinder.
Background technique
The servo hydraulic oil cylinder of prior art, piston rod directly contacts with guide sleeve, in running, due to long-time friction between piston rod and guide sleeve, easily there is wear problem, especially under high speed to-and-fro motion, as the to-and-fro motion under 200HZ, wearing and tearing between piston rod and guide sleeve are even more serious, cause servo hydraulic oil cylinder working efficiency to reduce the problem even occurring collapse.Simultaneously, the first Sealing between piston rod with guide sleeve can directly contact with the hydraulic oil in cylinder body, in servo hydraulic oil cylinder running, the active force of hydraulic oil can be subject to, under first Sealing is in the working environment of high pressure, easily produce wearing and tearing, heating even damages, cause sealing effect to decline even loss of seal performance, occur reducing the problem that hydraulic oil leaks the working efficiency of servo hydraulic oil cylinder and shorten the working life of servo hydraulic oil cylinder.
Summary of the invention
The object of the present invention is to provide and a kind ofly can effectively to reduce between piston rod and guide sleeve due to the wearing and tearing that cause of rubbing, stable sealing can be realized again, the servo hydraulic oil cylinder that working life is longer.
According to an aspect of the present invention, provide a kind of servo hydraulic oil cylinder, comprising:
Cylinder body, outer surface is provided with the first oil leak hole, the first oil hole that communicate with inner chamber of cylinder block;
Piston, is built in inner chamber of cylinder block and can does axially reciprocating, inner chamber of cylinder block being separated into independently two-part;
Piston rod, is fixed on piston, and its two ends pass the two ends of cylinder body respectively;
A pair guide sleeve, be located at cylinder body two ends and wear on the piston rod, be provided with the second oil hole and the second oil leak hole, the second oil hole communicates with the first oil hole, second oil leak hole communicates with the first oil leak hole, forms oil sealing surface between the inwall of guide sleeve and piston rod outer surface;
First Sealing, be located between the outer surface of piston rod and guide sleeve inwall, the first Sealing and inner chamber of cylinder block separate by oil sealing surface.
Oil sealing surface is formed between piston rod outer surface and guide sleeve inwall, suspension is formed toward oil sealing surface injection pressure lubricant oil by the first oil hole, static pressure oil film is formed between piston rod outer surface and guide sleeve, guide sleeve inwall and piston rod outer surface are separated completely, decrease the Relative friction between piston rod and guide sleeve significantly, decrease wearing and tearing between the two, improve the stability of a kind of servo hydraulic oil cylinder work of the present invention and extend working life.Simultaneously, run in working procedure at a kind of servo hydraulic oil cylinder of the present invention, hydraulic oil in first Sealing and inner chamber of cylinder block separates by static pressure oil film, the first Sealing is made to be in lower working pressure, efficiently avoid the first Sealing and easily occur wearing and tearing, generating heat the problem even damaged, enhance the sealing effect of the first Sealing, and then improve the stability of a kind of servo hydraulic oil cylinder work of the present invention and extend working life.
In some embodiments, guide sleeve inwall is provided with the oil pocket communicated with the second oil hole one_to_one corresponding, and oil pocket number is even number, is symmetrically distributed on the inwall of guide sleeve.Oil pocket and the second oil hole one_to_one corresponding, make pressure lubrication oil to enter in oil pocket equably, be beneficial to the formation of static pressure oil film; The number of oil pocket is even number, be symmetrically distributed on the inwall of guide sleeve, when making piston rod be subject to radial load, pressure difference is there will be between relative oil pocket, this pressure difference and radial load balance, make piston rod still be in the central authorities of cylinder body, which thereby enhance the stability of a kind of servo hydraulic oil cylinder work of the present invention.
In some embodiments, the outer surface of guide sleeve can also be provided with the first oil groove of connection first oil hole and the second oil hole.Thus avoid due to produce or assembly error cause the first oil hole and the second oil hole exist on do not go up or misalignment problem and affect pressure lubrication oil and enter smoothly, and then affect the formation of static pressure oil film, which thereby enhance the stability of a kind of servo hydraulic oil cylinder work of the present invention.
In some embodiments, the outer surface of guide sleeve can be provided with the second oil groove of connection first oil leak hole and the second oil leak hole.Make the quantity of number ratio second oil leak hole of the first oil leak hole also can realize releasing smoothly of pressure lubrication oil less thus, reduce the difficulty of cylinder body production and processing, improve the practicability of a kind of servo hydraulic oil cylinder of the present invention thus.
In some embodiments, piston rod can within be hollow.The weight of piston rod can be reduced thus, improve the dynamic performance of piston rod, the wearing and tearing between piston rod and guide sleeve can be efficiently reduced, thus improve the stability of a kind of servo hydraulic oil cylinder work of the present invention and extend working life.
In some embodiments, can also comprise the end cap being located at cylinder body two ends for a pair, end cap and the tight pressing of guide sleeve, make when piston rod runs, guide sleeve can not axially move outside cylinder body.Make guide sleeve can be designed as thus removable, conveniently carry out inspection and maintenance.
In some embodiments, the inwall of guide sleeve can be provided with the oil trap communicated with the second oil leak hole.The second oil leak hole place can be integrated into after making pressure lubrication oil flow through oil sealing surface thus, be convenient to pressure lubrication oil and release smoothly, improve the stability of a kind of servo hydraulic oil cylinder work of the present invention.
In some embodiments, the second Sealing can be provided with between piston and cylinder body.Second Sealing seals the gap between piston and cylinder barrel, prevents from leaking in hydraulic oil, improves the stability of a kind of servo hydraulic oil cylinder work of the present invention.
In some embodiments, the first Sealing and the second Sealing can enclose for O shape, Y shape circle, v shaped ring or rubber material and low-friction material and combined type packing ring in any one.Can select according to actual needs, improve the practicability of a kind of servo hydraulic oil cylinder of the present invention.
In some embodiments, the 3rd Sealing can be provided with between guide sleeve and cylinder body.3rd Sealing seals the gap between guide sleeve and cylinder body, prevents hydraulic oil from leaking outside, and improves the stability of a kind of servo hydraulic oil cylinder work of the present invention.
Accompanying drawing explanation
Fig. 1 is the section of structure of a kind of servo hydraulic oil cylinder of one embodiment of the present invention.
Fig. 2 is the sectional view of Fig. 1 along A-A line.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Fig. 1 show schematically show a kind of servo hydraulic oil cylinder according to one embodiment of the present invention.As shown in Figure 1, this servo hydraulic oil cylinder comprises cylinder body 1, piston 2, piston rod 3, a pair guide sleeve 4, first Sealing 5.In addition, a pair end cap 6, second Sealing 7 and the 3rd Sealing 8 is also comprised.
The outer surface of cylinder body 1 is provided with the first oil hole 101, first oil leak hole 102, first oil through 103 and the second oil through 104 communicated with inner chamber.Piston 2 is built in cylinder body 1 inner chamber, and its outer surface and cylinder body 1 inwall fit tightly, and cylinder body 1 inner chamber is separated into independently the first appearance oil pocket 105 and second and holds oil pocket 106.First oil through 103 and first holds oil pocket 105 and communicates, and the second oil through 104 and second holds oil pocket 106 and communicates.In the present embodiment, piston rod 3 and piston 2 are integrative-structures, and piston rod 3 two ends pass the two ends of cylinder body 1 respectively.In other embodiments, piston rod 3 can be that the mode that connected by semi-ring or be threaded is on the piston 2 affixed.
A pair cover guide sleeve 4 be through on piston rod 3 is fixedly connected on the two ends of cylinder body 1, lays respectively at the first appearance oil pocket 105 and second and holds in oil pocket 106.
As shown in Figure 2, oil sealing surface 9 is formed between the inwall of guide sleeve 4 and piston rod 3 outer surface.
In the present embodiment, being by being provided with end cap 6 at cylinder body 1 two ends, guide sleeve 4 is fixedly connected with cylinder body 1, specifically, is exactly the end that one end of the fixing part 401 of guide sleeve 4 is closely pressed together on cylinder body 1, when piston rod 3 is run, guide sleeve 4 can not axially move to cylinder body 1 inner chamber.End cap 6 is pressed together on the other end of guide sleeve 4 fixing part 401, and when piston rod 3 is run, guide sleeve 4 can not axially move outside cylinder body 1.In other embodiments, guide sleeve 4 and the Placement of cylinder body 1 can be by welding or being threaded, or guide sleeve 4 is integrative-structure with cylinder body 1.
In the present embodiment, end cap 6 is fixedly connected with cylinder body 1 by the mode of Flange joint, in other embodiments, also can be by welding, be threaded or the Placement such as pull bar connection.
Guide sleeve 4 offers the second oil hole 402 and the second oil leak hole 403, second oil hole 402 communicates with the first oil hole 101, the second oil leak hole 403 communicates with the first oil leak hole 102.
First Sealing 5 cover is through in the sealed groove on guide sleeve 4 inwall, between the outer surface and guide sleeve 4 inwall of piston rod 3.The quantity of the first Sealing 5 can be selected according to actual needs, and in the present embodiment, quantity is three.First Sealing 5 separates with cylinder body 1 inner chamber by oil sealing surface 9.
Second Sealing 7 cover is through in the sealed groove on piston 2 outer surface, between piston 2 outer surface and cylinder body 1 inwall.The quantity of the second Sealing 7 can be selected according to actual needs, and in the present embodiment, quantity is one.
3rd Sealing 8 socket is through in the sealed groove on guide sleeve 4 outer surface, between guide sleeve 4 outer surface and cylinder body 1 inwall.
When holding oil pocket 105 injection liquid force feed by the first oil through 103 toward first, piston 2 drives piston rod 3 to axially move to the second oil pocket 106.When holding oil pocket 106 injection liquid force feed by the second oil through 104 toward second, piston 2 drives piston rod 3 to yearn for the first appearance oil pocket 105 and axially moves.Thus realize piston 2 and drive piston rod 3 to do axially reciprocating.
Be hollow in piston rod 3, be hollow stem.The weight of piston rod 3 can be reduced thus, improve the dynamic performance of piston rod 3, the wearing and tearing between piston rod 3 and guide sleeve 4 can be efficiently reduced, thus improve stability and the working life of a kind of servo hydraulic oil cylinder work of the present invention.
As shown in Figure 2, guide sleeve 4 inwall has the oil pocket 404 communicated with the second oil hole 402 one_to_one corresponding.The quantity of oil pocket 404 is even number, is generally four, six or eight, in the present embodiment, is six, is symmetrically distributed on the inwall of guide sleeve 4.
The quantity of the second oil hole 402 and one_to_one corresponding consistent with the quantity of oil pocket 404.The outer surface that pressure lubrication oil evenly can be attached to piston rod 3 can be realized thus, be convenient to static pressure oil film and formed smoothly, improve the stability of a kind of servo hydraulic oil cylinder work of the present invention.
The outer surface of guide sleeve 4 has the first oil groove 405 of connection first oil hole 101 and the second oil hole 402.The first oil hole 101 is made to connect with the second all oil holes 402 thus, avoid due to produce or assembly error cause the first oil hole 101 and the second oil hole 402 exist on do not go up or misalignment problem and affect pressure lubrication oil and enter smoothly, and then affect the formation of static pressure oil film, which thereby enhance the stability of a kind of servo hydraulic oil cylinder work of the present invention.Meanwhile, the quantity also making the quantity of the first oil hole 101 be less than the second oil hole 402 also can realize the smooth injection of pressure lubrication oil.The difficulty of cylinder body 1 production and processing can be reduced thus, thus improve the practicability of a kind of servo hydraulic oil cylinder of the present invention.
The outer surface of guide sleeve 4 has the second oil groove 406 of connection first oil leak hole 102 and the second oil leak hole 403.The quantity making the quantity of the first oil leak hole 102 be less than the second oil leak hole 403 thus also can realize releasing smoothly of pressure lubrication oil.The difficulty of cylinder body 1 production and processing can be reduced thus, thus improve the practicability of a kind of servo hydraulic oil cylinder of the present invention.
The inwall of guide sleeve 4 has the oil trap 407 communicated with the second oil leak hole 403, oil trap 407 communicates with oil sealing surface 9, the second oil leak hole 403 place can be integrated into after making pressure lubrication oil flow through oil sealing surface 9, be convenient to pressure lubrication oil release smoothly, improve the stability of a kind of servo hydraulic oil cylinder work of the present invention.
First Sealing 5 and the second Sealing 7, can be O shape circle, Y shape circle, v shaped ring or rubber material and low-friction material and combined type packing ring.In the present embodiment, be the Assembled sealer that O shape RunddichtringO and ring washer are embedded as a whole, when making a kind of servo hydraulic oil cylinder of the present invention carry out high-frequency reciprocating motion, also can realize the sealing good and stable to hydraulic oil.
3rd Sealing 8 can be any one in y-shaped ring, U-shaped seal ring, O shape RunddichtringO or v-ring.In the present embodiment, it is O shape RunddichtringO.
When a kind of servo hydraulic oil cylinder of the present invention uses, constantly the pressure lubrication oil with certain pressure is pumped into from the first oil hole 101 by oil supply system, pressure lubrication oil flows through the first oil groove 405, second oil hole 402, enter oil pocket 404, piston rod 3 is pushed to the central authorities of cylinder body 1, static pressure oil film is formed in oil sealing surface 9, then oil sealing surface 9 is flowed through, oil pressure reduces close to zero, enter into oil trap 407 again, by the second oil leak hole 403, second oil groove 406 and the first oil leak hole 102, get back to the fuel tank in oil supply system, the circulation of mineralization pressure lubricant oil.When piston rod 3 is not by load, then the oil pressure in each oil pocket 404 is identical, and piston rod 3 is in the central authorities of cylinder body 1.When piston rod 3 is subject to the radial load of any direction, piston rod 3 produces micro-displacement (micron order), pressure difference is there will be between relative oil pocket, pressure difference is there is between relative oil pocket 404, this pressure difference and radial load balance, and make piston rod 3 still be in the central authorities of cylinder body 1.Pump into hydraulic oil toward the first oil through 103 or the second oil through 104 respectively, piston 2 can be realized and drive piston rod 3 to carry out axially reciprocating, realize the control to outside actuator.
In the process that a kind of servo hydraulic oil cylinder of the present invention runs, especially when carrying out high-frequency operation, as the to-and-fro motion under 200HZ, all the time isolated by static pressure oil film between guide sleeve 4 and piston rod 3, form liquid friction between the two, wear and tear less, improve working stability and extend working life.First Sealing 5 separates with the hydraulic oil in cylinder body 1 inner chamber by static pressure oil film, under making the first Sealing 5 be in extremely low pressure all the time in servo hydraulic oil cylinder working procedure, efficiently avoid the first Sealing 5 and occur wearing and tearing, generating heat the problem even damaged, therefore, it is possible to realize stable sealing owing to being subject to the pressure of hydraulic oil.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. a servo hydraulic oil cylinder, is characterized in that, comprising:
Cylinder body, outer surface is provided with the first oil leak hole, the first oil hole that communicate with inner chamber of cylinder block;
Piston, is built in described inner chamber of cylinder block and can does axially reciprocating, described inner chamber of cylinder block is separated into independently two-part;
Piston rod, be fixed on described piston, its two ends pass the two ends of described cylinder body respectively;
A pair guide sleeve, being located at described cylinder body two ends and overlapping is through on described piston rod, be provided with the second oil hole and the second oil leak hole, described second oil hole communicates with the first oil hole, described second oil leak hole communicates with the first oil leak hole, forms oil sealing surface between the inwall of described guide sleeve and described piston rod outer surface;
First Sealing, be located between the outer surface of described piston rod and described guide sleeve inwall, described first Sealing and described inner chamber of cylinder block separate by described oil sealing surface.
2. a kind of servo hydraulic oil cylinder according to claim 1, is characterized in that, described guide sleeve inwall is provided with the oil pocket communicated with described second oil hole one_to_one corresponding, and described oil pocket number is even number, is symmetrically distributed on the inwall of guide sleeve.
3. a kind of servo hydraulic oil cylinder according to claim 2, is characterized in that, the outer surface of described guide sleeve is provided with the first oil groove being communicated with described first oil hole and described second oil hole.
4. a kind of servo hydraulic oil cylinder according to claim 3, is characterized in that, the outer surface of described guide sleeve is provided with the second oil groove being communicated with described first oil leak hole and described second oil leak hole.
5. a kind of servo hydraulic oil cylinder according to claim 4, is characterized in that, is hollow in described piston rod.
6. a kind of servo hydraulic oil cylinder according to any one of claim 1-5, it is characterized in that, also comprise the end cap being located at described cylinder body two ends for a pair, described end cap and the tight pressing of described guide sleeve, make when described piston rod runs, described guide sleeve can not axially move outside described cylinder body.
7. a kind of servo hydraulic oil cylinder according to claim 6, is characterized in that, the inwall of described guide sleeve is provided with the oil trap communicated with described second oil leak hole.
8. a kind of servo hydraulic oil cylinder according to claim 7, is characterized in that, is provided with the second Sealing between described piston and described cylinder body.
9. a kind of servo hydraulic oil cylinder according to claim 8, is characterized in that, described first Sealing and the second Sealing be O shape circle, Y shape circle, v shaped ring or rubber material and low-friction material and combined type packing ring in any one.
10. a kind of servo hydraulic oil cylinder according to claim 9, is characterized in that, is provided with the 3rd Sealing between described guide sleeve and described cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310064013.0A CN103174699B (en) | 2013-02-28 | 2013-02-28 | A kind of servo hydraulic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310064013.0A CN103174699B (en) | 2013-02-28 | 2013-02-28 | A kind of servo hydraulic oil cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN103174699A CN103174699A (en) | 2013-06-26 |
| CN103174699B true CN103174699B (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310064013.0A Expired - Fee Related CN103174699B (en) | 2013-02-28 | 2013-02-28 | A kind of servo hydraulic oil cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104454765B (en) * | 2014-12-31 | 2016-04-06 | 太原科技大学 | A kind of level pressure oil feeding type anti-bias load horizontal servo oil cylinder design method |
| CN105952710A (en) * | 2016-07-12 | 2016-09-21 | 天津优瑞纳斯液压机械有限公司 | High frequency response low friction servo hydraulic cylinder |
| FI127250B (en) * | 2016-10-07 | 2018-02-15 | Metener Oy | Equipment for gas pressure increase with lubrication |
| CN108194450A (en) * | 2017-12-29 | 2018-06-22 | 宁波海天金属成型设备有限公司 | The oil cylinder for preventing cylinder piston rod from leaking |
| CN109515673A (en) * | 2018-10-30 | 2019-03-26 | 武汉船用机械有限责任公司 | A kind of ship hydraulic steering mechanism |
| CN110219334B (en) * | 2019-04-02 | 2024-05-14 | 台州贝力特机械有限公司 | Hydraulic breaking hammer |
| CN110219851B (en) * | 2019-04-02 | 2024-04-26 | 台州贝力特机械有限公司 | Piston guide structure of hydraulic breaking hammer |
| CN111375182B (en) * | 2020-04-24 | 2021-05-04 | 河南科技大学第一附属医院 | Expiration intensity trainer |
| CN112727513B (en) * | 2021-01-19 | 2022-06-10 | 中国煤炭科工集团太原研究院有限公司 | Anchor drilling machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498327A (en) * | 2009-02-27 | 2009-08-05 | 武汉科技大学 | Oil film supporting servo hydraulic cylinder |
| CN101725588A (en) * | 2009-11-10 | 2010-06-09 | 武汉科技大学 | Hydraulic cylinder with clearance sealed type deformed piston |
| CN102032236A (en) * | 2011-01-17 | 2011-04-27 | 江阴市洪腾机械有限公司 | Hydraulic cylinder of double piston rods |
| CN203081896U (en) * | 2013-02-28 | 2013-07-24 | 韶关市伟光液压油缸有限公司 | Servo hydrocylinder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006030929A1 (en) * | 2006-07-05 | 2008-01-10 | Stabilus Gmbh | Piston / Cylinder Unit with Diagnostic Unit |
-
2013
- 2013-02-28 CN CN201310064013.0A patent/CN103174699B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498327A (en) * | 2009-02-27 | 2009-08-05 | 武汉科技大学 | Oil film supporting servo hydraulic cylinder |
| CN101725588A (en) * | 2009-11-10 | 2010-06-09 | 武汉科技大学 | Hydraulic cylinder with clearance sealed type deformed piston |
| CN102032236A (en) * | 2011-01-17 | 2011-04-27 | 江阴市洪腾机械有限公司 | Hydraulic cylinder of double piston rods |
| CN203081896U (en) * | 2013-02-28 | 2013-07-24 | 韶关市伟光液压油缸有限公司 | Servo hydrocylinder |
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| CN103174699A (en) | 2013-06-26 |
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Granted publication date: 20151118 |