CN103089742A - Hydrostatic system, hydrostatic steering system and hydrostatic pressure-limiting oil replenishing device thereof - Google Patents
Hydrostatic system, hydrostatic steering system and hydrostatic pressure-limiting oil replenishing device thereof Download PDFInfo
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- CN103089742A CN103089742A CN2011103403195A CN201110340319A CN103089742A CN 103089742 A CN103089742 A CN 103089742A CN 2011103403195 A CN2011103403195 A CN 2011103403195A CN 201110340319 A CN201110340319 A CN 201110340319A CN 103089742 A CN103089742 A CN 103089742A
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Abstract
Disclosed are a hydrostatic system, a hydrostatic steering system and a hydrostatic pressure-limiting oil replenishing device thereof. The hydrostatic system comprises a plurality of hydrostatic hydraulic cylinders and the hydrostatic pressure-limiting oil replenishing device, the hydrostatic steering system comprises a steering signal cylinder, a steering actuation cylinder and the hydrostatic pressure-limiting oil replenishing device, the hydrostatic pressure-limiting oil replenishing device comprises a cylinder body, a piston component and an elastic component, the piston component is mounted in the cylinder body, the elastic component is used for balancing total pressure of hydrostatic chambers of the hydrostatic system and connected with the piston component, the piston component comprises multiple pistons and a piton rod, the piston rod is used for connecting the pistons, each piston divides an internal space of the cylinder body into a containing chamber and an oil storage chamber which are positioned on two sides of the piston, the containing chamber and the oil storage chamber between two adjacent pistons are spaced by a spacing sleeve, and the multiple oil storage chambers are communicated with the corresponding hydrostatic chambers of the hydrostatic system respectively. By the hydrostatic pressure-limiting oil replenishing device, operability and reliability of the hydrostatic system are improved greatly.
Description
Technical field
The present invention relates to a kind of quiet liquid system, particularly a kind ofly realize keeping quiet liquid system pressure stable, and solve quiet liquid system pressure and affected by ambient temperature and unexpected overload to change large, need to press recharging oil device to quiet liquid system, hydrostatic steering system and the quiet liquid limit thereof of the frequent repairing of quiet liquid system (as the hydrostatic steering system).
Background technique
Large-scale multiple-axle vehicle or trailer adopt the hydrostatic steering system more or adopt quiet liquid to transmit turn signal (or feedback signal), hydrodynamic power steering system.For guaranteeing to turn to precision, quiet liquid system should have certain rigidity, is therefore the loop of an oil-filled pressure.
The pressure of quiet liquid system changed by external temperature and unexpected overload to affect variation larger, the pressure that fills when hot temperature, at midnight or meet under the environment of the sudden drop in temperature such as shower, oil pressure can decrease, even pressure is zero; Otherwise under the environment that temperature jumps, oil pressure can significantly rise, and the untimely oil pressure that bleeds off has the possibility of damage system.Even if use in the little environment of temperature variation, due to the oil cylinder in quiet liquid system in the course of the work piston rod will inevitably take oil film out of, the oil pressure that fills in therefore quiet liquid system will soon descend, quiet liquid system needs frequent repairing, complicated operation is loaded down with trivial details.
Respectively adopt an accumulator in two pipelines of the quiet liquid system that is everlasting in prior art, can stablize for a long time oil pressure, but at quiet night during system works, for example in steering procedure when quiet liquid system's transmission of signal or power, a cavity pressure can raise, and fluid can enter accumulator, and the pressure in another chamber can reduce, fluid in accumulator can be emitted, and causes turn signal larger error to occur in transmittance process, and radius of turn strengthens.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can guarantee quiet liquid system pressure for a long time the stable quiet liquid limit that does not affect again the operating accuracy of system at quiet night press recharging oil device.
to achieve these goals, the invention provides a kind of quiet liquid limit and press recharging oil device, be used for keeping the pressure stability of quiet liquid system, wherein, comprise cylinder body, piston element and elastic member, described piston element is arranged in described cylinder body, described elastic member is used for the total pressure of the quiet sap cavity of the described quiet liquid of balance system, described elastic member is connected with described piston element, described piston element comprises a plurality of pistons and piston rod, described piston rod is used for connecting described a plurality of piston, described piston is cavity volume and shoe cream room with spatial separation in described cylinder body, described cavity volume and described shoe cream room lay respectively at the both sides of described piston, described cavity volume between the adjacent pistons of described a plurality of pistons and described shoe cream room are separated by the sealing spacer, described a plurality of shoe cream room is communicated with the corresponding quiet sap cavity of described quiet liquid system respectively.
Above-mentioned quiet liquid limit is pressed recharging oil device, and wherein, described elastic member is a spring, the two ends of described spring respectively with described piston rod be connected cylinder body and be connected, described cavity volume is provided with return opening.
Above-mentioned quiet liquid limit is pressed recharging oil device, and wherein, described elastic member is a high-pressure gasbag, and described high-pressure gasbag is arranged in described cavity volume.
Above-mentioned quiet liquid limit is pressed recharging oil device, and wherein, described elastic member is an accumulator, and described accumulator comprises liquid container and air chamber, and described liquid container is communicated with described cavity volume, and described air chamber filling pressurized gas or described air chamber are communicated with a source of the gas.Above-mentioned quiet liquid limit is pressed recharging oil device, wherein, described a plurality of piston comprises first piston and the second piston, described first piston and described the second piston are the first shoe cream room, the second shoe cream room, the first cavity volume and the second cavity volume with spatial separation in described cylinder body, are communicated with by an oil through between described the first cavity volume and described the second cavity volume.
Above-mentioned quiet liquid limit is pressed recharging oil device, and wherein, described oil through is arranged on described piston rod.
Above-mentioned quiet liquid limit is pressed recharging oil device, it is characterized in that, described the second piston and described piston rod are structure as a whole, and described first piston is threaded connection the end at described piston rod.
Above-mentioned quiet liquid limit is pressed recharging oil device, it is characterized in that, the liquid entering hole of described the first shoe cream room is arranged on described cylinder body, and the liquid entering hole of described the second shoe cream room is arranged on described piston rod.
In order to realize better above-mentioned purpose, the present invention also provides a kind of quiet liquid system, comprise a plurality of quiet liquid oil hydraulic cylinders, the corresponding quiet sap cavity of described a plurality of quiet liquid oil hydraulic cylinders is communicated with respectively, wherein, also comprise quiet liquid limit pressure recharging oil device, described quiet liquid limit presses recharging oil device to be connected with described a plurality of quiet liquid oil hydraulic cylinders respectively, and it is that above-mentioned quiet liquid limit is pressed recharging oil device that described quiet liquid limit is pressed recharging oil device.
In order to realize better above-mentioned purpose, the present invention also provides a kind of hydrostatic steering system, comprise turn signal cylinder and steering actuation cylinder, the quiet sap cavity of described turn signal cylinder is communicated with the corresponding quiet sap cavity of described steering actuation cylinder, wherein, comprise that also quiet liquid limit presses recharging oil device, described quiet liquid limit press recharging oil device respectively with described turn signal cylinder be connected steering actuation cylinder and be connected, it is above-mentioned quiet liquid limit pressure recharging oil device that described quiet liquid limit is pressed recharging oil device.
Technique effect of the present invention is: quiet liquid limit of the present invention is pressed recharging oil device, realized to guarantee that quiet liquid system pressure is stable for a long time, do not affect again the operating accuracy of system at quiet night, operability and the reliability of quiet liquid system have greatly been improved, solve simultaneously quiet liquid system pressure and be subjected to ambient temperature and unexpected overload to affect variation greatly, needed the problem of frequent repairing.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the quiet liquid system architecture schematic diagram of one embodiment of the invention;
Fig. 2 is the hydrostatic steering system architecture schematic diagram of one embodiment of the invention;
Fig. 3 is that the quiet liquid limit of one embodiment of the invention is pressed the recharging oil device structural representation;
Fig. 4 is that the quiet liquid limit of another embodiment of the present invention is pressed the recharging oil device structural representation;
Fig. 5 is that the quiet liquid limit of further embodiment of this invention is pressed the recharging oil device structural representation;
Fig. 6 is that the quiet liquid limit of one embodiment of the invention is pressed the recharging oil device sectional view.
Wherein, reference character
1 quiet liquid system
11 quiet liquid oil hydraulic cylinders
12 pipelines
The quiet sap cavity of P1, P2
2 hydrostatic steering systems
21 turn signal cylinders
22 steering actuation cylinders
23 pipelines
The quiet sap cavity of P1, P2
3 quiet liquid limits are pressed recharging oil device
31 cylinder bodies
311 cavity volumes
3,111 first cavity volumes
3,112 second cavity volumes
312 shoe cream rooms
313 left end caps
314 right end caps
315 first shoe cream rooms
316 second shoe cream rooms
317 oil throughs
318 filler openings
319 return openings
32 piston elements
321 pistons
322 piston rods
323 first pistons
324 second pistons
325 nuts
33 elastic members
331 springs
332 spring seats
333 high-pressure gasbags
334 accumulators
3341 liquid container
3342 air chamber
335 sources of the gas
336 nuts
34 sealing spacers
35 fuel tanks
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and working principle are done concrete description:
Referring to Fig. 1, Fig. 1 is the quiet liquid system architecture schematic diagram of one embodiment of the invention.Quiet liquid of the present invention system 1, comprise a plurality of quiet liquid oil hydraulic cylinders 11, these a plurality of quiet liquid oil hydraulic cylinders 11 comprise initiatively quiet liquid oil hydraulic cylinder and from sound liquid oil hydraulic cylinder, described a plurality of quiet liquid oil hydraulic cylinder 11 (because of principle identical, therefore below all be explained as an example of two quiet sap cavities example) corresponding quiet sap cavity P1, P2 corresponding connection respectively, this quiet liquid system 1 comprises that also quiet liquid limit presses recharging oil device 3, and described quiet liquid limit presses recharging oil device 3 to be connected with described a plurality of quiet liquid oil hydraulic cylinders 11 by pipeline 12 respectively.
Referring to Fig. 2, Fig. 2 is the hydrostatic steering system architecture schematic diagram of one embodiment of the invention.Hydrostatic steering of the present invention system 2, comprise turn signal cylinder 21 and steering actuation cylinder 22, quiet sap cavity P1, the P2 of described turn signal cylinder 21 is communicated with corresponding quiet sap cavity P1, the P2 of described steering actuation cylinder 22, this hydrostatic steering system 2 comprises that also quiet liquid limit presses recharging oil device 3, described quiet liquid limit press recharging oil device 3 respectively by pipeline 23 and described turn signal cylinder 21 be connected steering actuation cylinder 22 and be connected.Because composition, function, structure and the annexation of other parts of above-mentioned quiet liquid system 1 and hydrostatic steering system 2 is more ripe prior art, and therefore not to repeat here, and the below only presses recharging oil device 3 to be described in detail to quiet liquid limit of the present invention.
Referring to Fig. 3～Fig. 6, Fig. 3 is that the quiet liquid limit of one embodiment of the invention is pressed the recharging oil device structural representation, Fig. 4 is that the quiet liquid limit of another embodiment of the present invention is pressed the recharging oil device structural representation, Fig. 5 is that the quiet liquid limit of further embodiment of this invention is pressed the recharging oil device structural representation, and Fig. 6 is that the quiet liquid limit of one embodiment of the invention is pressed the recharging oil device sectional view.quiet liquid limit of the present invention is pressed recharging oil device 3, be used for keeping the pressure stability of quiet liquid system 1, comprise cylinder body 31, piston element 32 and elastic member 33, described piston element 32 is arranged in described cylinder body 31, described elastic member 33 is used for the quiet sap cavity P1 of the described quiet liquid of balance system 1, the total pressure of P2, in the present embodiment, described elastic member 33 is used for the closing of pressure of two quiet sap cavities of the described quiet liquid of balance system 1, described elastic member 33 is connected with described piston element 32, described piston element 32 comprises a plurality of pistons 321 and piston rod 322, described piston rod 322 is used for connecting described a plurality of piston 321, described piston 321 is divided into cavity volume 311 and shoe cream room 312 with described cylinder body 31 inner spaces, described cavity volume 311 and described shoe cream room 312 lay respectively at the both sides of described piston 321, described cavity volume 311 between the adjacent pistons of described a plurality of piston 321 and described shoe cream room 312 are separated by sealing spacer 34, described a plurality of shoe cream room 312 is communicated with the corresponding quiet sap cavity of described quiet liquid system 1 respectively.
In one embodiment of this invention, described elastic member 33 can be a spring 331 (as Fig. 3, shown in Figure 5), controls quiet liquid two cavity pressures by spring 331 stretching piston rods 322.The two ends of described spring 331 respectively with described piston rod 322 be connected cylinder body 31 and be connected, described cavity volume 311 is provided with return opening 319, for example this return opening 319 can preferably be arranged on the left end cap 313 of cylinder body, this return opening 319 can be communicated with a fuel tank 35.In the present embodiment, one end of this spring 331 is arranged on spring seat 332, spring seat 332 is arranged on the end of piston rod 322, the end of piston rod 322 shown in this spring seat 332 for example can be arranged on by a nut 336, and the other end of this spring 331 is resisted against on the right end cap 314 of cylinder body 31.
In another embodiment of invention, described elastic member 33 can be a high-pressure gasbag 333 (referring to Fig. 4), and described high-pressure gasbag 333 is arranged in described cavity volume 311.In the present embodiment, also can this cavity volume 311 directly as high-pressure gasbag, namely at the interior direct filling pressurized gas of cavity volume 311.
In the another embodiment of invention, described elastic member 33 can be an accumulator 334 (referring to Fig. 5), described accumulator 334 comprises liquid container 3341 and air chamber 3342, described liquid container 3341 is communicated with described cavity volume 311, and described air chamber 3342 can be communicated with a source of the gas 335 or this air chamber 3342 can shift to an earlier date the filling pressurized gas.
Referring to Fig. 6, in the present embodiment, described a plurality of piston 321 comprises first piston 323 and the second piston 324, described first piston 323 and described the second piston 324 are the first shoe cream room 315, the second shoe cream room 316, the first cavity volume 3111 and the second cavity volume 3112 with described cylinder body 31 interior separations, are communicated with by an oil through 317 between described the first cavity volume 3111 and described the second cavity volume 3112.Described oil through 317 can preferably be arranged on described piston rod 322.In order to process and easy to assembly, described the second piston 324 can be set to integrative-structure with described piston rod 322, described first piston 323 with shown in piston rod 322 be set to Split type structure, this first piston 323 can be connected to by a nut 325 top of described piston rod 322.In the present embodiment, the liquid entering hole 318 of described the first shoe cream room 315 preferably is arranged on described cylinder body 31, and the liquid entering hole 318 of described the second shoe cream room 316 preferably is arranged on described piston rod 322.In the present embodiment, the oil pressure in two shoe cream rooms 315,316 acts on the direction of the power on piston rod 322 and the opposite direction that elastic member 33 acts on the power on piston rod 322.Be separated by the sealing spacer 34 between this first piston 323, the second piston 324 between the second cavity volume 3112 and the first shoe cream room 315.
The present invention adopts spring or pressurized gas etc. to have the elastic member 33 quiet sap cavity P1 of while balance two of elastic force, the total pressure of P2, a chamber when turning to (P1 or P2) pressure raises, during another chamber (P2 or P1) pressure decreased, making a concerted effort of P1, P2 two chambeies is substantially constant, therefore quiet liquid limit presses shoe cream room 312 volumes of recharging oil device 3 can not change, and does not affect to turn to precision.
When ambient temperature raises, the temperature of two pipelines of quiet liquid system 1 raises simultaneously, the pressure in P1, P2 two chambeies also increases, raising with joint efforts of P1, P2 two chambeies, make quiet liquid limit press the spring 331 of the elastic member 33 of recharging oil device 3 to shrink or the pressurized gas compression, hold fluid, play the effect of accumulator, the pressure in P1, P2 two chambeies is limited within the specific limits, eliminate the problem that variation of ambient temperature significantly changes quiet sap cavity P1, P2 pressure, and can stablize for a long time the oil pressure of quiet liquid system 1.
When ambient temperature reduces, the temperature of two pipelines of quiet liquid system 1 reduces simultaneously, the pressure in P1, P2 two chambeies also decreases, reducing with joint efforts of P1, P2 two chambeies, make quiet liquid limit press the spring 331 of the elastic member 33 of recharging oil device 3 to stretch out or expansion of compressed gas, emit fluid, play the effect of accumulator, the pressure in P1, P2 two chambeies is limited within the specific limits, eliminate the problem that variation of ambient temperature significantly changes quiet sap cavity P1, P2 pressure, and can stablize for a long time the oil pressure of quiet liquid system.
Referring to Fig. 2, when turning to, two quiet sap cavity one chamber (for example P1) pressure raise, another chamber (P2) pressure decreased, quiet sap cavity P1, P2 pressure sum are constant, and therefore quiet liquid limit presses two shoe cream room 312 volumes of recharging oil device 3 not change, and can not affect to turn to precision; The volume of two quiet sap cavity P1, P2 changes simultaneously when temperature variation, press the volume-variation of 3 liang of shoe cream rooms 312 of recharging oil device by quiet liquid limit, the pressure of hydrostatic steering system 2 is limited within the specific limits, because two shoe cream room 312 volume-variation are identical, all the time equate, can not affect and turn to precision.
Quiet liquid limit of the present invention is pressed recharging oil device, realized to guarantee that quiet liquid system pressure is stable for a long time, do not affect again the operating accuracy of quiet liquid system, operability and the reliability of quiet liquid system have greatly been improved, solve simultaneously quiet liquid system pressure and be subjected to ambient temperature and unexpected overload to affect variation greatly, needed the problem of frequent repairing.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. a quiet liquid limit is pressed recharging oil device, be used for keeping the pressure stability of quiet liquid system, it is characterized in that, comprise cylinder body, piston element and elastic member, described piston element is arranged in described cylinder body, described elastic member is used for the total pressure of the quiet sap cavity of the described quiet liquid of balance system, described elastic member is connected with described piston element, described piston element comprises a plurality of pistons and piston rod, described piston rod is used for connecting described a plurality of piston, described piston is cavity volume and shoe cream room with described cylinder interior spatial separation, described cavity volume and described shoe cream room lay respectively at the both sides of described piston, described cavity volume between the adjacent pistons of described a plurality of pistons and described shoe cream room are separated by the sealing spacer, described a plurality of shoe cream room is communicated with the corresponding quiet sap cavity of described quiet liquid system respectively.
2. quiet liquid limit as claimed in claim 1 is pressed recharging oil device, it is characterized in that, described elastic member is a spring, the two ends of described spring respectively with described piston rod be connected cylinder body and be connected, described cavity volume is provided with return opening.
3. quiet liquid limit as claimed in claim 1 is pressed recharging oil device, it is characterized in that, described elastic member is a high-pressure gasbag, and described high-pressure gasbag is arranged in described cavity volume.
4. quiet liquid limit as claimed in claim 1 is pressed recharging oil device, it is characterized in that, described elastic member is an accumulator, and described accumulator comprises liquid container and air chamber, described liquid container is communicated with described cavity volume, and described air chamber filling pressurized gas or described air chamber are communicated with a source of the gas.
5. press recharging oil device as claim 1,2,3 or 4 described quiet liquid limits, it is characterized in that, described a plurality of piston comprises first piston and the second piston, described first piston and described the second piston are the first shoe cream room, the second shoe cream room, the first cavity volume and the second cavity volume with spatial separation in described cylinder body, are communicated with by an oil through between described the first cavity volume and described the second cavity volume.
6. quiet liquid limit as claimed in claim 5 is pressed recharging oil device, it is characterized in that, described oil through is arranged on described piston rod.
7. quiet liquid limit as claimed in claim 5 is pressed recharging oil device, it is characterized in that, described the second piston and described piston rod are structure as a whole, and described first piston is threaded connection the end at described piston rod.
8. quiet liquid limit as claimed in claim 7 is pressed recharging oil device, it is characterized in that, the liquid entering hole of described the first shoe cream room is arranged on described cylinder body, and the liquid entering hole of described the second shoe cream room is arranged on described piston rod.
9. quiet liquid system, comprise a plurality of quiet liquid oil hydraulic cylinders, the corresponding quiet sap cavity of described a plurality of quiet liquid oil hydraulic cylinders is communicated with respectively, it is characterized in that, also comprise quiet liquid limit pressure recharging oil device, described quiet liquid limit presses recharging oil device to be connected with described a plurality of quiet liquid oil hydraulic cylinders respectively, and it is the described quiet liquid limit pressure recharging oil device of any one in above-mentioned claim 1,2,3,4,6,7 or 8 that described quiet liquid limit is pressed recharging oil device.
10. hydrostatic steering system, comprise turn signal cylinder and steering actuation cylinder, the quiet sap cavity of described turn signal cylinder is communicated with the corresponding quiet sap cavity of described steering actuation cylinder, it is characterized in that, also comprise quiet liquid limit pressure recharging oil device, described quiet liquid limit press recharging oil device respectively with described turn signal cylinder be connected steering actuation cylinder and be connected, it is the described quiet liquid limit pressure recharging oil device of any one in above-mentioned claim 1,2,3,4,6,7 or 8 that described quiet liquid limit is pressed recharging oil device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340319.5A CN103089742B (en) | 2011-11-01 | 2011-11-01 | Hydrostatic system, hydrostatic steering system and hydrostatic pressure limiting recharging oil device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340319.5A CN103089742B (en) | 2011-11-01 | 2011-11-01 | Hydrostatic system, hydrostatic steering system and hydrostatic pressure limiting recharging oil device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103089742A true CN103089742A (en) | 2013-05-08 |
| CN103089742B CN103089742B (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110340319.5A Active CN103089742B (en) | 2011-11-01 | 2011-11-01 | Hydrostatic system, hydrostatic steering system and hydrostatic pressure limiting recharging oil device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266427A (en) * | 2017-11-23 | 2018-07-10 | 湖北江山专用汽车有限公司 | A kind of machinery total travel self-locking hydraulic cylinder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144947A (en) * | 1976-12-10 | 1979-03-20 | David Brown Tractors Limited | Power steering systems |
| CN85102747A (en) * | 1985-04-09 | 1986-10-08 | 吉林工业大学 | All hydraulic pressure steering-gear with energy-storaging spring |
| DE3902810A1 (en) * | 1988-02-04 | 1989-08-17 | Zahnradfabrik Friedrichshafen | Multi-axle steering system |
| CN102207160A (en) * | 2010-03-30 | 2011-10-05 | Zf腓特烈斯哈芬股份公司 | Vibration damper with integrated level control |
-
2011
- 2011-11-01 CN CN201110340319.5A patent/CN103089742B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144947A (en) * | 1976-12-10 | 1979-03-20 | David Brown Tractors Limited | Power steering systems |
| CN85102747A (en) * | 1985-04-09 | 1986-10-08 | 吉林工业大学 | All hydraulic pressure steering-gear with energy-storaging spring |
| DE3902810A1 (en) * | 1988-02-04 | 1989-08-17 | Zahnradfabrik Friedrichshafen | Multi-axle steering system |
| CN102207160A (en) * | 2010-03-30 | 2011-10-05 | Zf腓特烈斯哈芬股份公司 | Vibration damper with integrated level control |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266427A (en) * | 2017-11-23 | 2018-07-10 | 湖北江山专用汽车有限公司 | A kind of machinery total travel self-locking hydraulic cylinder |
| CN108266427B (en) * | 2017-11-23 | 2023-09-08 | 湖北江山专用汽车有限公司 | Mechanical full-stroke self-locking hydraulic cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103089742B (en) | 2016-08-03 |
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