CN102207114B - Two-stage servo hydraulic cylinder - Google Patents
Two-stage servo hydraulic cylinder Download PDFInfo
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- CN102207114B CN102207114B CN201110149503.1A CN201110149503A CN102207114B CN 102207114 B CN102207114 B CN 102207114B CN 201110149503 A CN201110149503 A CN 201110149503A CN 102207114 B CN102207114 B CN 102207114B
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Abstract
The invention relates to a two-stage servo hydraulic cylinder. The technical scheme is that: the hydraulic cylinder consists of a static pressure cylinder and a dynamic pressure cylinder, wherein the cylinder bodies (2) of the static pressure cylinder and the dynamic pressure cylinder are integrated; a static pressure piston rod (33) is concentrically arranged in a static pressure cavity (27) of the static pressure cylinder; the working end of the static pressure piston rod (33) passes through a left end cover (1); a static pressure piston (5) is arranged on the static pressure piston rod (33); a dynamic pressure piston rod (34) is concentrically arranged in a dynamic pressure cavity (21) of the dynamic pressure cylinder; the working end of the dynamic pressure piston rod (34) passes through a cylinder body partition wall and the hollow part of the static pressure piston rod (33); and the width of a first leakage oil annular groove (32) formed on the inner wall of a through hole of the left end cover (1) is 1.3 to 2 times the travel of the static pressure piston (5). The hydraulic cylinder has the characteristics of small friction force, high dynamic response, energy saving and capability of outputting high vibration frequency and high excitation force which change up and down near large constant force according to a certain rule.
Description
Technical field
The invention belongs to oil hydraulic cylinder technical field, be specifically related to a kind of two-stage servo hydraulic cylinder.
Background technique
Under some operating mode, near the high frequency power that needs output to change up and down according to certain rules a larger constant force, for example 200kN ± 100sin ω tkN, 200kN is larger constant force, 100sin ω tkN is the high frequency dynamic force changing according to certain rules, when this power of output, there is following problem in common oil hydraulic cylinder:
1. because load is larger, the natural frequency of oil hydraulic cylinder diminishes, and speed of response is poor, is difficult to meet the requirement of output high frequency variation power;
2, hydraulic cylinder works cavity pressure is large, and the sealed ring deformation amount between hydraulic cylinder piston and cylinder body is large, and the frictional force between piston and cylinder body is large, increases piston running resistance, is difficult to meet the requirement of output high frequency variation power;
3, due to output high frequency and larger power, hydraulic cylinder piston area is large, and piston maximum operational speed is large, and the needed working flow of oil hydraulic cylinder is large, is unfavorable for energy-conservation.
Based on above several respects reason, common oil hydraulic cylinder is because frictional force is large and dynamic response is poor, can not meet near the shake requirement of frequency, high excitation force of height that output changes up and down according to certain rules a larger constant force.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide that a kind of frictional force is little, dynamic response is high, save the energy and can export that near the height changing up and down according to certain rules a larger constant force shakes frequently, the two-stage servo hydraulic cylinder of high excitation force.
For achieving the above object, the technical solution used in the present invention is: two-stage servo hydraulic cylinder is comprised of static pressure cylinder and dynamic pressure cylinder.The cylinder body of static pressure cylinder and dynamic pressure cylinder is an entirety, and the front half part of cylinder body is static pressure cylinder, and latter half part is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall.
Static pressure cylinder comprises left end cap, static pressure piston and static pressure piston rod.Static pressure piston rod is hollow cylinder, static pressure piston rod is arranged in the static pressure chamber of static pressure cylinder concentrically, the working end of static pressure piston rod is through left end cap, static pressure piston is arranged on static pressure piston rod, one side of static pressure piston is close to the shaft shoulder of static pressure piston rod, on the static pressure piston rod of static pressure piston opposite side, spring washer and nut is housed.Dynamic pressure cylinder comprises right end cap, dynamic pressure piston and dynamic pressure piston rod, dynamic pressure piston rod is arranged in the dynamic pressure cavity of dynamic pressure cylinder concentrically, dynamic pressure piston is arranged on dynamic pressure piston rod, one side of dynamic pressure piston is close to the shaft shoulder of dynamic pressure piston rod, on the dynamic pressure piston rod of dynamic pressure piston opposite side, spring washer and nut is housed.The 9th seal ring, through the through hole at cylinder body partition wall center and the central through bore of static pressure piston rod, is equipped with in the seal groove of dynamic pressure piston rod working end in the working end of dynamic pressure piston rod.The end of dynamic pressure piston rod is through right end cap, and mounting cup is arranged on the center position of right end cap.One end of displacement transducer is fixed on mounting cup, and the other end of displacement transducer is inserted in the hole of dynamic pressure piston-rod end.
On the cylinder body of static pressure cylinder, be respectively equipped with the first actuator port and the second actuator port that communicate with both sides, static pressure chamber, on the cylinder body of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port and the 4th actuator port that communicate with dynamic pressure cavity both sides.At the inwall of cylinder body partition wall central through bore, have the 3rd and leak oily circular groove, the place, neutral position of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port that oily circular groove communicates.The first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port and leak hydraulic fluid port respectively the valve port corresponding with servo valve seat communicate.
The through-hole wall of left end cap is provided with the first leakage oil circular groove, and first leaks oily circular groove communicates by the second oily passage of leakage on the cylinder body of the oily passage of leakage of first on left end cap and static pressure cylinder and the oily circular groove of the 3rd leakage.Inwall place at static pressure piston rod corresponding to the first leakage oil circular groove is provided with the second leakage oil circular groove, and second leaks oily circular groove communicates by the 3rd oily passage of leakage and the oily circular groove of the first leakage.
The first width that leaks oily circular groove is 1.3～2 times of static pressure piston stroke.
Between described dynamic pressure piston and cylinder body, adopt clearance seal, between dynamic pressure piston rod and cylinder body partition wall inwall, adopt clearance seal, between dynamic pressure piston rod and static pressure piston rod, adopt clearance seal.
The outer wall of described dynamic pressure piston has 3～5 the first compensating grooves, on the dynamic pressure piston rod of the central through bore contact segment of dynamic pressure piston rod and cylinder body partition wall, has 4～6 the second compensating grooves.
Owing to adopting technique scheme, the present invention has following good effect:
1, the present invention is divided into static pressure cylinder and dynamic pressure cylinder two large divisions by oil hydraulic cylinder, the constant force that static pressure cylinder output is larger, the dynamic force that the output of dynamic pressure cylinder changes up and down, for example export the power of 200kN ± 100sin ω tkN, the larger constant force of static pressure cylinder output 200kN, less ± 100sin ω tkN the dynamic force of dynamic pressure cylinder output, although static pressure cylinder constant load is large, because static pressure cylinder is the response frequency no requirement (NR) of static loading to oil hydraulic cylinder, the dynamic load of dynamic pressure cylinder is less, dynamic response is high, easily realizes upper frequency output.
2, the present invention passes static pressure piston rod hollow parts by dynamic pressure piston rod, adopt clearance seal therebetween, leakage oil leaks oily passage by the oily circular groove of the first leakage, the oily circular groove of the second leakage, the oily circular groove of the 3rd leakage, the oily passage of the first leakage, second and the oily passage of the 3rd leakage draws oil sump tank from leakage hydraulic fluid port, in the working end of dynamic pressure piston rod and static pressure piston rod part, form low pressure area, because pressure is low, the 9th sealed ring deformation for low pressure motive sealing between static pressure piston rod and dynamic pressure piston rod is little, and between dynamic pressure piston rod and static pressure piston rod, frictional force is little; In addition, owing to all adopting clearance seal between dynamic pressure piston rod and cylinder body partition wall, dynamic pressure piston and cylinder body, dynamic pressure cylinder frictional force is little, and dynamic response is high.
3, the present invention is divided into static pressure cylinder and dynamic pressure cylinder two large divisions by oil hydraulic cylinder, static pressure cylinder is by the given constant pressure of constant pressure oil source (accumulator) fuel feeding, dynamic pressure cylinder is by oil pump feed, because dynamic load is less, dynamic pressure piston area is little, needed working flow is little, has the effect of saving the energy.
Therefore, the present invention has that frictional force is little, dynamic response is high, saves the energy and can export that the height changing up and down according to certain rules shakes frequently, the feature of high excitation force near a larger constant force.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described, not the restriction to its protection domain:
Embodiment 1
A kind of two-stage servo hydraulic cylinder.This two-stage servo hydraulic cylinder as shown in Figure 1, is comprised of static pressure cylinder and dynamic pressure cylinder.The cylinder body 2 of static pressure cylinder and dynamic pressure cylinder is an entirety, and the front half part of cylinder body 2 is static pressure cylinder, and latter half part is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall.
Static pressure cylinder comprises left end cap 1, static pressure piston 5 and static pressure piston rod 33.Static pressure piston rod 33 is hollow cylinder, static pressure piston rod 33 is arranged in the static pressure chamber 27 of static pressure cylinder concentrically, the working end of static pressure piston rod 33 is through left end cap 1, static pressure piston 5 is arranged on static pressure piston rod 33, one side of static pressure piston 5 is close to the shaft shoulder of static pressure piston rod 33, and spring washer 25 and nut 26 are housed on the static pressure piston rod 33 of static pressure piston 5 opposite sides.Dynamic pressure cylinder comprises right end cap 12, dynamic pressure piston 9 and dynamic pressure piston rod 34, dynamic pressure piston rod 34 is arranged in the dynamic pressure cavity 20 of dynamic pressure cylinder concentrically, dynamic pressure piston 9 is arranged on dynamic pressure piston rod 34, one side of dynamic pressure piston 9 is close to the shaft shoulder of dynamic pressure piston rod 34, and spring washer 18 and nut 17 are housed on the dynamic pressure piston rod 34 of dynamic pressure piston 9 opposite sides.The 9th seal ring 35, through the through hole at cylinder body partition wall center and the central through bore of static pressure piston rod 33, is equipped with in dynamic pressure piston rod 34 working end seal grooves in the working end of dynamic pressure piston rod 34.The end of dynamic pressure piston rod 34 is through right end cap 12, and mounting cup 15 is arranged on the center position of right end cap 12; One end of displacement transducer 16 is fixed on mounting cup 15, and the other end of displacement transducer 16 is inserted in the hole of dynamic pressure piston rod 34 ends.
On the cylinder body 2 of static pressure cylinder, be respectively equipped with the first actuator port 3 and the second actuator port 6 that communicate with 27 both sides, static pressure chamber, on the cylinder body 2 of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port 8 and the 4th actuator port 11 that communicate with dynamic pressure cavity 20 both sides.At the inwall of cylinder body partition wall central through bore, have the 3rd and leak oily circular groove 21, the place, neutral position of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port 7 that oily circular groove 21 communicates.The first actuator port 3, the second actuator port 6, the 3rd actuator port 8, the 4th actuator port 11 and leak hydraulic fluid port 7 respectively the valve port corresponding with servo valve seat 4 communicate.
The through-hole wall of left end cap 1 is provided with the oily circular groove 32 of the first leakage oil circular groove 32, the first leakage and communicates by the second oily passage 29 of leakage on the cylinder body 2 of the oily passage 31 of leakage of first on left end cap 1 and static pressure cylinder and the oily circular groove 21 of the 3rd leakage; At the inwall place of the static pressure piston rod 33 of the first leakage oil circular groove 32 correspondences, being provided with the oily circular groove 36 of the second leakage oil circular groove 36, the second leakage communicates by the 3rd oily passage 38 of leakage and the oily circular groove 32 of the first leakage.
The first width that leaks oily circular groove 32 is 1.3～1.5 times of static pressure piston 5 strokes.
The outer wall of dynamic pressure piston 9 has 4 the first compensating grooves 10, on the dynamic pressure piston rod 34 of the central through bore contact segment of dynamic pressure piston rod 34 and cylinder body partition wall, has 4 the second compensating grooves 22.
In the present embodiment: between dynamic pressure piston 9 and cylinder body 2, adopt clearance seal, between dynamic pressure piston rod 34 and cylinder body partition wall inwall, adopt clearance seal, between dynamic pressure piston rod 34 and static pressure piston rod 33, adopt clearance seal.
The seal groove of the annular boss outer wall of left end cap 1 is equipped with the 6th seal ring 28; At first of left end cap 1 end face, leak in the closed hole of oily passage 31 the 8th seal ring 30 is housed, the diameter in sealing hole is more than or equal to the external diameter of the 8th seal ring 30, and the internal diameter of the 8th seal ring 30 is more than or equal to the diameter of the first leakage oil passage 31; In the seal groove of the leakage of first on left end cap 1 inner hole wall oily circular groove 32 both sides, the 7th seal ring 37 is housed respectively.
In two seal grooves of static pressure piston 5 outer walls, the 5th seal ring 23 is housed respectively, the 4th seal ring 24 is housed in the seal groove of static pressure piston 5 inner hole walls.
The 3rd seal ring 19 is housed in the seal groove of dynamic pressure piston 9 inner hole walls.
The first seal ring 13 is housed in the seal groove of the annular boss outer wall of right end cap 12; In two seal grooves of right end cap 12 inner hole walls, the second seal ring 14 is housed respectively.
Embodiment 2
A kind of two-stage servo hydraulic cylinder.Except following technical parameter, all the other are with embodiment 1.
The first width that leaks oily circular groove 32 is 1.5～2 times of static pressure piston 5 strokes.
The outer wall of dynamic pressure piston 9 has 3 the first compensating grooves 10, on the dynamic pressure piston rod 34 of the central through bore contact segment of dynamic pressure piston rod 34 and cylinder body partition wall, has 5 the second compensating grooves 22.
Embodiment 3
A kind of two-stage servo hydraulic cylinder.Except following technical parameter, all the other are with embodiment 1.
The first width that leaks oily circular groove 32 is 1.4～1.8 times of static pressure piston 5 strokes.
The outer wall of dynamic pressure piston 9 has 5 the first compensating grooves 10, on the dynamic pressure piston rod 34 of the central through bore contact segment of dynamic pressure piston rod 34 and cylinder body partition wall, has 6 the second compensating grooves 22.
This embodiment has following good effect:
Owing to adopting technique scheme, this embodiment has following good effect:
1, this embodiment is divided into static pressure cylinder and dynamic pressure cylinder two large divisions by oil hydraulic cylinder, the constant force that static pressure cylinder output is larger, the dynamic force that the output of dynamic pressure cylinder changes up and down, for example export the power of 200kN ± 100sin ω tkN, the larger constant force of static pressure cylinder output 200kN, less ± 100sin ω tkN the dynamic force of dynamic pressure cylinder output, although static pressure cylinder constant load is large, because static pressure cylinder is the response frequency no requirement (NR) of static loading to oil hydraulic cylinder, the dynamic load of dynamic pressure cylinder is less, dynamic response is high, easily realizes upper frequency output.
2, this embodiment is passed static pressure piston rod 33 hollow parts by dynamic pressure piston rod 34, adopt clearance seal therebetween, leak oil and leak oily circular groove 32 by first, second leaks oily circular groove 36, the 3rd leaks oily circular groove 21, first leaks oily passage 31, the second oily passage 29 of leakage and the 3rd leaks oily passage 38 and draws oil sump tank from leaking hydraulic fluid port 7, in the working end of dynamic pressure piston rod 34 and static pressure piston rod 33 part, form low pressure area, because pressure is low, the 9th seal ring 35 for low pressure motive sealing between static pressure piston rod 33 and dynamic pressure piston rod 34 is out of shape little, between dynamic pressure piston rod 34 and static pressure piston rod 33, frictional force is little, in addition, owing to all adopting clearance seal between dynamic pressure piston rod 34 and cylinder body partition wall, dynamic pressure piston 9 and cylinder body 2, dynamic pressure cylinder frictional force is little, and dynamic response is high.
3, this embodiment is divided into static pressure cylinder and dynamic pressure cylinder two large divisions by oil hydraulic cylinder, static pressure cylinder can pass through constant pressure oil source, the given constant pressure of for example accumulator, dynamic cylinder dynamic load is little, needed flow is little, therefore the needed working flow of oil hydraulic cylinder is less, has the effect of saving the energy.
This embodiment has that frictional force is little, dynamic response is high, save the energy and can export near a larger constant force according to certain rules the shake feature of frequency, high excitation force of the height of variation up and down.
Claims (3)
1. a two-stage servo hydraulic cylinder, it is characterized in that: two-stage servo hydraulic cylinder is comprised of static pressure cylinder and dynamic pressure cylinder, the cylinder body (2) of static pressure cylinder and dynamic pressure cylinder is an entirety, the front half part of cylinder body (2) is static pressure cylinder, latter half part is dynamic pressure cylinder, between static pressure cylinder and dynamic pressure cylinder, is provided with cylinder body partition wall; Static pressure cylinder is by the higher constant pressure oil source fuel feeding of pressure, and dynamic pressure cylinder is by oil pump feed, and static pressure cylinder is exported larger constant force, the high frequency dynamic force that the output of dynamic pressure cylinder changes up and down, and dynamic pressure piston (9) Area Ratio static pressure piston (5) area is little;
Static pressure cylinder comprises left end cap (1), static pressure piston (5) and static pressure piston rod (33); Static pressure piston rod (33) is hollow cylinder, static pressure piston rod (33) is arranged in the static pressure chamber (27) of static pressure cylinder concentrically, the working end of static pressure piston rod (33) is through left end cap (1), static pressure piston (5) is arranged on static pressure piston rod (33), one side of static pressure piston (5) is close to the shaft shoulder of static pressure piston rod (33), and spring washer (25) and nut (26) are housed on the static pressure piston rod (33) of static pressure piston (5) opposite side; Dynamic pressure cylinder comprises right end cap (12), dynamic pressure piston (9) and dynamic pressure piston rod (34), dynamic pressure piston rod (34) is arranged in the dynamic pressure cavity (20) of dynamic pressure cylinder concentrically, dynamic pressure piston (9) is arranged on dynamic pressure piston rod (34), one side of dynamic pressure piston (9) is close to the shaft shoulder of dynamic pressure piston rod (34), and spring washer (18) and nut (17) are housed on the dynamic pressure piston rod (34) of dynamic pressure piston (9) opposite side; Seal ring (35), through the through hole at cylinder body partition wall center and the central through bore of static pressure piston rod (33), is equipped with in the seal groove of dynamic pressure piston rod (34) working end in the working end of dynamic pressure piston rod (34); The end of dynamic pressure piston rod (34) is through right end cap (12), and mounting cup (15) is arranged on the center position of right end cap (12); It is upper that one end of displacement transducer (16) is fixed on mounting cup (15), and the other end of displacement transducer (16) is inserted in the hole of dynamic pressure piston rod (34) end;
On the cylinder body (2) of static pressure cylinder, be respectively equipped with the first actuator port (3) and the second actuator port (6) that communicate with both sides, static pressure chamber (27), on the cylinder body (2) of dynamic pressure cylinder, be respectively equipped with the 3rd actuator port (8) and the 4th actuator port (11) that communicate with dynamic pressure cavity (20) both sides; At the inwall of cylinder body partition wall central through bore, have the 3rd and leak oily circular groove (21), the place, neutral position of cylinder body partition wall is provided with the 3rd and leaks the leakage hydraulic fluid port (7) that oily circular groove (21) communicates; The first actuator port (3), the second actuator port (6), the 3rd actuator port (8), the 4th actuator port (11) and leak hydraulic fluid port (7) respectively the valve port corresponding with servo valve seat (4) communicate;
The through-hole wall of left end cap (1) is provided with the first leakage oil circular groove (32), and first leaks oily circular groove (32) communicates by the second oily passage of leakage (29) on the cylinder body (2) of the oily passage of leakage of first on left end cap (1) (31) and static pressure cylinder and the 3rd oily circular groove of leakage (21); Inwall place at static pressure piston rod (33) corresponding to the first leakage oil circular groove (32) is provided with the second leakage oil circular groove (36), and the second oily circular groove of leakage (36) leaks oily circular groove (32) by the 3rd oily passage of leakage (38) and first and communicates;
The first width that leaks oily circular groove (32) is 1.3～2 times of static pressure piston (5) stroke.
2. two-stage servo hydraulic cylinder according to claim 1, it is characterized in that adopting clearance seal between described dynamic pressure piston (9) and cylinder body (2), between dynamic pressure piston rod (34) and cylinder body partition wall inwall, adopt clearance seal, between dynamic pressure piston rod (34) and static pressure piston rod (33), adopt clearance seal.
3. two-stage servo hydraulic cylinder according to claim 1 and 2, the outer wall that it is characterized in that described dynamic pressure piston (9) has 3～5 the first compensating grooves (10), on the dynamic pressure piston rod (34) of the central through bore contact segment of dynamic pressure piston rod (34) and cylinder body partition wall, has 4～6 the second compensating grooves (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110149503.1A CN102207114B (en) | 2011-06-03 | 2011-06-03 | Two-stage servo hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110149503.1A CN102207114B (en) | 2011-06-03 | 2011-06-03 | Two-stage servo hydraulic cylinder |
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| CN102207114A CN102207114A (en) | 2011-10-05 |
| CN102207114B true CN102207114B (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110149503.1A Expired - Fee Related CN102207114B (en) | 2011-06-03 | 2011-06-03 | Two-stage servo hydraulic cylinder |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734253A (en) * | 2012-07-11 | 2012-10-17 | 银川市恒益达机械有限公司 | Double feed servo hydraulic cylinder |
| CN103438048A (en) * | 2013-08-28 | 2013-12-11 | 无锡市长江液压缸厂 | Static pressure supporting high-frequency vibration servo hydraulic cylinder |
| CN103437833B (en) * | 2013-09-09 | 2016-05-25 | 中国航空动力机械研究所 | Air inlet guide vane adjusting device |
| CN103867525B (en) * | 2014-04-08 | 2015-10-21 | 武汉科技大学 | A kind of velocity transformation double-piston serial oil hydraulic cylinder |
| CN104564901B (en) * | 2015-01-27 | 2016-08-24 | 武汉科技大学 | A kind of low friction hydraulic cylinder based on miniature round pool |
| CN105269563A (en) * | 2015-11-30 | 2016-01-27 | 宁波新芝华东环保科技有限公司 | Environment-friendly three-freedom-degree fetching mechanical arm used under dangerous work conditions |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4029289A (en) * | 1973-12-11 | 1977-06-14 | Institute Francais Du Petrole, Des Carburants Et Lubrifiants Et Entreprise De Recherches Et D'activities Elf | Control system for gate-valves |
| CN1313933A (en) * | 1998-07-08 | 2001-09-19 | Aro公司 | Actuating cylinder with an approach pre-stroke and a working stroke for operating a tool |
| CN101324245A (en) * | 2008-07-03 | 2008-12-17 | 武汉科技大学 | Hydraulic cylinder of low friction force |
| CN202091287U (en) * | 2011-06-03 | 2011-12-28 | 武汉科技大学 | Combination type servo hydraulic cylinder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08254203A (en) * | 1995-03-17 | 1996-10-01 | Tokico Ltd | Cylinder device |
-
2011
- 2011-06-03 CN CN201110149503.1A patent/CN102207114B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029289A (en) * | 1973-12-11 | 1977-06-14 | Institute Francais Du Petrole, Des Carburants Et Lubrifiants Et Entreprise De Recherches Et D'activities Elf | Control system for gate-valves |
| CN1313933A (en) * | 1998-07-08 | 2001-09-19 | Aro公司 | Actuating cylinder with an approach pre-stroke and a working stroke for operating a tool |
| CN101324245A (en) * | 2008-07-03 | 2008-12-17 | 武汉科技大学 | Hydraulic cylinder of low friction force |
| CN202091287U (en) * | 2011-06-03 | 2011-12-28 | 武汉科技大学 | Combination type servo hydraulic cylinder |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平8-254203A 1996.10.01 |
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