CN108999830A - Hydraulic cylinder, fluid power system and engineering machinery - Google Patents
Hydraulic cylinder, fluid power system and engineering machinery Download PDFInfo
- Publication number
- CN108999830A CN108999830A CN201810701234.7A CN201810701234A CN108999830A CN 108999830 A CN108999830 A CN 108999830A CN 201810701234 A CN201810701234 A CN 201810701234A CN 108999830 A CN108999830 A CN 108999830A
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- China
- Prior art keywords
- guide sleeve
- piston rod
- hydraulic cylinder
- cylinder body
- gap
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- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1471—Guiding means other than in the end cap
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The present invention relates to technical field of hydraulic equipment, a kind of hydraulic cylinder, fluid power system and engineering machinery are disclosed.Wherein, the hydraulic cylinder includes: cylinder body；It is slidably disposed in the piston of the inside of cylinder body；It is fixedly connected on the piston rod of piston, there is the first circumferential gap between the inner wall of cylinder body；First guide sleeve is at least partially disposed in the described first circumferential gap, and has the second circumferential gap between piston rod；Second guide sleeve is sheathed on piston rod and is at least partially situated in the second circumferential gap, while it is bonded and can be with the opposite first guide sleeve radial floating of the piston rod with piston rod packing；Nut cap, is covered on the open end of cylinder body, and cylinder body, the first guide sleeve and the second guide sleeve are fixed to one another along axial direction.Present invention improves the followabilities of guide sleeve and piston rod packing, improve the sealing performance of piston rod packing, improve the anti-side loading capability and low speed dynamic property of hydraulic cylinder.
Description
Technical field
The present invention relates to technical field of hydraulic equipment, more particularly to a kind of hydraulic cylinder, with the hydraulic pressure system of the hydraulic cylinder
System and the engineering machinery with the hydraulic system.
Background technique
Major diameter long stroke hydraulic cylinder has low-speed stability requirement in use, i.e. low speed dynamic performance requirements are high.Such as
Hydraulic cylinder shown in FIG. 1, piston rod is during low speed extends and retracts, because of side load, fit clearance, accumulation mismachining tolerance and work
The reasons such as stopper rod self weight, creep or abnormal sound phenomenon with shake.Currently, in order to guarantee that piston rod extends and retracts movement in low speed
When do not generate shake and creep or abnormal sound phenomenon, common method is to improve the machining accuracy of oil cylinder, increase fit clearance and reduction
The minimum stable speed of service requirement of oil cylinder.And these methods have a disadvantage that 1) process equipment required precision height；2) oil cylinder low speed is dynamic
State property can be poor；3) seal durability is short.
Summary of the invention
The purpose of the invention is to overcome the piston rod of the elongated journey hydraulic cylinder of major diameter of the existing technology to stretch in low speed
It creeps when out with retract action with shake or the problem of abnormal sound phenomenon.
To achieve the goals above, one aspect of the present invention provides a kind of hydraulic cylinder, comprising:
Cylinder body；
Piston, the piston are slidably disposed in the inside of the cylinder body；
Piston rod, the piston rod are fixedly connected on the piston, and circumferential with first between the inner wall of the cylinder body
Gap；
First guide sleeve, first guide sleeve are at least partially disposed in the described first circumferential gap, and with the work
There is the second circumferential gap between stopper rod；
Second guide sleeve, second guide sleeve are sheathed on the piston rod and are at least partially situated at described second circumferentially
In gap, which is bonded with the piston rod packing and can be radial with opposite first guide sleeve of the piston rod
It floats；
Nut cap, the nut cap are covered on the open end of the cylinder body, and make the cylinder body, the first guide sleeve and the second guiding
Set is fixed to one another along axial direction.
Preferably, first guide sleeve has the first support portion being set in the described first circumferential gap and by this
What the first support portion extended protrudes from first auxiliary section in the described first circumferential gap；Second guide sleeve, which has, is set to institute
It states the second support portion in the second circumferential gap and protrudes from the described second circumferential gap by what second support portion extended
Second auxiliary section；The nut cap is covered on the cylinder body, the first auxiliary section and the second support portion, so that the cylinder body, first
Guide sleeve and the second guide sleeve are fixed to one another along axial direction.
Preferably, there is first axis gap between the nut cap and the end of the cylinder body, first auxiliary section
Hold-down segment is set in the first axis gap；There is the second axial gap, institute between the nut cap and first auxiliary section
The hold-down segment for stating the second support portion is set in second axial gap, the nut cap along the first auxiliary section described in axial compression and
The hold-down segment of second support portion, so that the cylinder body, the first guide sleeve and the second guide sleeve are fixed to one another along axial direction.
Preferably, the side of the first guide sleeve towards the piston rod is provided with composite bush and by the composite lining
Set conforms to the piston rod.
Preferably, the side of the second guide sleeve towards the piston rod is provided at least one sealing ring.
Preferably, the sealing ring includes the slide mass that opposite sliding is in contact and be capable of with piston rod, the slide mass
Elastomer is connected with the frictional dissipation for reducing the slide mass.
Preferably, the side of the second guide sleeve towards the piston rod is provided with dustband, which is installed on
One end far from the piston of second guide sleeve.
Preferably, the side of second guide sleeve towards first guide sleeve is provided with static sealing ring, the static seal
Enclosing has at least two seal lips being arranged towards first guide sleeve.
Preferably, radial floating is respectively arranged between second guide sleeve and first guide sleeve and the nut cap
Gap h.
Preferably, the radial floating gap h is not less than 0.5mm.
Preferably, the side of the second guide sleeve towards the piston rod is provided with guide ring.
The present invention provides a kind of fluid power system in second aspect, which includes as described above hydraulic
Cylinder.
The present invention provides a kind of engineering machinery in the third aspect, which includes hydraulic-driven system as described above
System.
Through the above technical solutions, guide sleeve structure is set split type structure by the present invention so that guide sleeve structure by
First guide sleeve and the second guide sleeve are constituted, and make the second guide sleeve and piston rod packing fitting and can be opposite with piston rod
First guide sleeve radial floating, the split type guide sleeve structure improve the followability of guide sleeve and piston rod packing, are promoted
The sealing performance of piston rod packing, improves the anti-side loading capability and low speed dynamic property of hydraulic cylinder, avoids piston rod and exist
When low speed extends and retracts movement with shake creep or abnormal sound phenomenon.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hydraulic cylinder of the prior art；
Fig. 2 is the structural schematic diagram of hydraulic cylinder of the invention；
Fig. 3 is the A of hydraulic cylinder in Fig. 2 to partial schematic diagram；
Fig. 4 is enlarged drawing at the D of hydraulic cylinder in Fig. 2；
Fig. 5 is enlarged drawing at the D of hydraulic cylinder in Fig. 2.
Description of symbols
1 cylinder body, 2 piston
3 spacer, 4 piston rod
5 composite bush, 6 guide ring
7 this special U-shaped circle of envelope 8
9 dustband, 10 first guide sleeve
11 static sealing ring, 12 second guide sleeve
13 nut cap h radial floating gaps
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In the present invention, term " first ", " second " ... wait and be only used for for different technologies feature being distinguished, not
For limiting the weight primary and secondary of technical characteristic, in case of need, these technical characteristics can achieve the effect that essentially identical.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, left and right " is typically referred to reference to attached drawing
Shown in upper and lower, left and right；" inside and outside " refers to the inside and outside of the profile relative to each component itself.
Referring to shown in Fig. 2 to Fig. 5, the present invention provides a kind of hydraulic cylinders, including cylinder body 1, piston 2, piston rod 4, first
Guide sleeve 10, the second guide sleeve 12 and nut cap 13.Wherein, piston 2 is slidably disposed in the inside of cylinder body 1；Piston rod 4 is fixed
It is connected to piston 2, and there is the first circumferential gap between the inner wall of cylinder body 1；First guide sleeve 10 is at least partially disposed at
In first circumferential gap, and there is the second circumferential gap between piston rod 4；Second guide sleeve 12 is sheathed on piston rod 4 simultaneously
It is at least partially situated in the second circumferential gap, second guide sleeve 12 and 4 palette of piston rod and can be with 4 phase of piston rod
To 10 radial floating of the first guide sleeve；Nut cap 13 is covered on the open end of cylinder body 1, and makes cylinder body 1, the first guide sleeve 10 and
Two guide sleeves 12 are fixed to one another along axial direction.
It is understood that nut cap 13 is fixed to one another cylinder body 1, the first guide sleeve 10 and the second guide sleeve 12 along axial direction
Indicate the nut cap 13 so that cylinder body 1, the first guide sleeve 10 and the second guide sleeve 12 do not generate relative displacement substantially in the axial direction
The pressure for bestowing cylinder body 1, the first guide sleeve 10 and the second guide sleeve 12, which should be guaranteed that, enables the second guide sleeve 12 with piston
Bar 4 is with respect to 10 radial floating of the first guide sleeve.
Through the above technical solutions, guide sleeve structure is set split type structure by the present invention so that guide sleeve structure by
First guide sleeve 10 and the second guide sleeve 12 are constituted, and make the second guide sleeve 12 and 4 palette of piston rod and can be with work
Stopper rod 4 is with respect to 10 radial floating of the first guide sleeve, which improves guide sleeve structure and piston rod 4 seals
Followability, improve the sealing performance of the sealing of piston rod 4, improve the anti-side loading capability of hydraulic cylinder (hydraulic cylinder) and low
Fast dynamic property.
First guide sleeve 10 may further have the first support portion and with first that first support portion extends
Portion, for the first support zone in the first circumferential gap, the first auxiliary section protrudes from the first circumferential gap setting；Second guide sleeve 12
Further with the second support portion and by the second auxiliary section of second support portion extension, the second support zone is circumferential in second
In gap, the second auxiliary section protrudes from the second circumferential gap setting；Nut cap 13 is covered on the outer wall of cylinder body 1, the first auxiliary section,
Two support portions and the second auxiliary section.Wherein, nut cap 13 is covered on the outer wall of cylinder body, the first auxiliary section and the second support portion and can make
Cylinder body 1, the first guide sleeve 10 and the second guide sleeve 12 is obtained to be fixed to one another along axial direction.And nut cap 13 is further covered on the second cooperation
Portion, on this basis, to set in the lid of nut cap 13 and may be used also at second auxiliary section for being completely enclosed the open end of cylinder body 1
O-ring is arranged, to guarantee the sealing performance of the open end of cylinder body 1.
First auxiliary section may further have hold-down segment, between first axis between nut cap 13 and the end of cylinder body 1
Gap, the hold-down segment of the first auxiliary section are contained in the first axis gap；Second support portion also has hold-down segment, nut cap 13 simultaneously
There is the second axial gap between the first auxiliary section, the hold-down segment of the second support portion is contained in second axial gap；Lid
Cap 13 applies pressure to the hold-down segment of the first auxiliary section and the second support portion along axial direction, so that cylinder body 1, the first guide sleeve 10
It is fixed to one another with the second guide sleeve 12 along axial direction.So set, keeping this hydraulic cylinder easy to produce and assembling.
In order to improve the followability that guide sleeve structure and piston rod 4 seal, the leakproofness that lift piston rod 4 seals
Can, the present invention is respectively arranged with multiple sealing elements on the first guide sleeve 10 and the second guide sleeve 12, and the cooperation of these sealing elements is originally
The split type guide sleeve structure of invention, finally to improve the anti-side loading capability and low speed dynamic property of hydraulic cylinder.Below in conjunction with
Fig. 2, Fig. 4 and Fig. 5 on the first guide sleeve 10 and the second guide sleeve 12 multiple sealing elements and guide part be specifically described.
Referring to shown in Fig. 2, Fig. 4 and Fig. 5, the side of the first guide sleeve 10 towards piston rod 4 is provided with composite bush 5, should
Composite bush 5 plays the role of guiding and support, and self-lubricating effect is good, can effectively reduce frictional force, and the first guide sleeve 10 passes through
The composite bush 5 conforms to piston rod, to improve the sealing performance of piston rod 4.Meanwhile first guide sleeve 10 towards the one of cylinder body
Side is provided with multiple O-rings, and the sealing performance that can be improved cylinder body 1 is arranged such, and avoid the first guide sleeve 10 and cylinder body 1 because
It is mutual to hit and rub and rupture.
Second guide sleeve 12 is disposed with guide ring 6, this spy's envelope 7, U-shaped circle towards the side of piston rod 4 from left to right
8, guide ring 6 and dustband 9.Wherein, guide ring 6 plays guiding and supporting role；Si Te envelope 7 is made of slide mass and elastomer,
Slide mass contacted with piston rod 4 and can relative motion, slide mass have special section and, energy small with plunger rod contacts area
Effective Absorbing hydraulic pulsation and less frictional force, elastomer are used to make up the frictional dissipation of slide mass；U-shaped circle 8 can also be by sliding
Kinetoplast and elastomer composition, slide mass add copper powder to form by polytetrafluoroethylene (PTFE), and hardness is higher, contact and have opposite with piston rod 4
Movement, the slide mass coefficient of friction is small, while can reduce the contact area of elastomer Yu piston rod 4, effectively reduces frictional force, prevents
Only elastomer squeezes out, and elastomer is nitrile rubber, plays the role of primary seal, while making up slide mass frictional dissipation；It is dust-proof
Circle 9 plays the role of dustproof and waterproof.The present invention can be by the way that guide ring 6, all kinds of sealing rings (this spy's envelope 7, U-shaped circle 8) etc. to be arranged
Piston rod 4 is oriented to and is sealed on the second guide sleeve 12, and using second guide sleeve 12, can be utilized when low speed is run
The radial floating of second guide sleeve 12 makes it keep good (coaxial) cooperation with piston rod 4, can effectively prevent shaking creep or
Abnormal sound phenomenon.
The side of second guide sleeve 12 towards the first guide sleeve 10 is provided with static sealing ring 11, which has this
Body portion and lip portion, lip portion include two sealed lips, which is arranged towards the first guide sleeve 10, static seal
Circle 11 plays sealing function by the interference compression of two seal lip, and pressure acts on the body part of static sealing ring 11, increases
The contact stress of seal lip and the first guide sleeve 10 and trench bottom diameter, and also increase accordingly with the increase contact stress of pressure
Greatly, compared with other static seals, static sealing ring 11 of the invention has good anti-extrusion performance, and convenient for assembly.
It should be noted that above-mentioned this spy's envelope 7, U-shaped circle 8 and the preferably unidirectional sealing of static sealing ring 11, i.e., when hydraulic
When oil is entered by the right end hydraulic fluid port of hydraulic cylinder, which plays the effect of its sealing.It is multiple
Bushing 5 and multiple O-rings are closed on the first guide sleeve 10, guide ring 6, this spy's envelope 7, U-shaped circle 8, dustband 9 and static sealing ring
11 on the second guide sleeve 12, separately has sealing element and piston guide ring to be mounted in the side of piston 2, cylinder body 1, piston rod 4, piston
2, the first guide sleeve 10 and the second guide sleeve 12 constitute closed two chamber (rodless cavity and rod chamber), to realize stretching for hydraulic cylinder
Out and retract action.
Specifically, in Fig. 2, when hydraulic oil is entered by the left end hydraulic fluid port of hydraulic cylinder, rodless cavity is full of hydraulic oil, liquid
Cylinder pressure does extending action, generates pressure by the effect of external applied load；The piston guide ring of 2 left end of piston and right end does not play sealing
Effect plays guiding and supporting role；One-way seals among piston 2 can effective Absorbing hydraulic pulsation, effectively reduce frictional force；
Two-way seal among piston is made of slide mass and elastomer, and slide mass has special V-shaped groove, can have liquid in V-shaped groove
Pressure oil, small to effectively reduce frictional force with 1 contact area of cylinder body, elastomer is for making up slide mass frictional dissipation.Work as hydraulic oil
When being entered by oil cylinder right end hydraulic fluid port, rod chamber is full of hydraulic oil, and hydraulic cylinder does retract action, generates pressure by the effect of external applied load
Power, composite bush 5, guide ring 6, this spy's envelope 7, U-shaped circle 8, dustband 9 and static sealing ring 11 play respective effect respectively.
In addition, as shown in figure 5, being respectively set between the second guide sleeve 12 and the first guide sleeve 10 and nut cap 13 of the invention
There is radial floating gap h, radial floating gap h is preferably not less than 0.5mm.Stretched out when piston rod 4 is done/when retracting work,
It can generate certain amount of deflection under Gravitative Loads, and the fit clearance in each components, unbalance loading and accumulation mismachining tolerance influence
Under, the axis of piston rod 4 and the axis of 1 inner hole of cylinder body can have certain angle, and in this case, piston rod 4 can generate centainly
Bending and beat.And the radial direction of 0.5mm is respectively arranged between the second guide sleeve 12 and the first guide sleeve 10 and nut cap 13
Flying height h, and static sealing ring 11 is configured on the second guide sleeve 12, allow the second guide sleeve 12 with piston rod 4 one
Determine to float up and down in range, so as to improve guide ring 6, this spy's envelope 7, the followability of U-shaped circle 8 and dustband 9, it is ensured that guide part
With the uniformity of sealing element and 4 surface contact stress of piston rod, improves sealing performance and low speed dynamic property, avoid hydraulic cylinder work
Low jitter is generated when making to creep or abnormal sound phenomenon.
In addition, in one particular embodiment of the present invention, spacer 3 can also be arranged in the outside of piston rod 4, the spacer
There is gap, when piston rod 4 does stretch out motion, which plays position-limiting action, that is, works as spacer between 3 and the inner wall of cylinder body 1
3 with the first guide sleeve 10 when connecting, and piston rod 4 can not continue to stretch out, which can be used for controlling the stroke of hydraulic cylinder.
The present invention provides in another aspect a kind of fluid power system, which includes above-mentioned hydraulic
Cylinder.The present invention also provides a kind of engineering machinery, which includes above-mentioned fluid power system.
In conclusion hydraulic cylinder low speed good operation stability of the invention, extend and retract that non-jitter is creeped or abnormal sound is existing
As hydraulic cylinder starting pressure of the invention is low, and the hydraulic cylinder contamination resistance is strong.Hydraulic cylinder of the invention can be applied to but not
It is limited to the every field such as engineering machinery, environmental sanitation machinery and high-altitude operation vehicle.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited thereto.At this
, can be with various simple variants of the technical solution of the present invention are made in the range of the technology design of invention, including each particular technique
Feature is combined in any suitable manner, and in order to avoid unnecessary repetition, the present invention is to various combinations of possible ways
No further explanation will be given.But it should also be regarded as the disclosure of the present invention for these simple variants and combination, belongs to the present invention
Protection scope.
Claims (13)
1. a kind of hydraulic cylinder characterized by comprising
Cylinder body (1)；
Piston (2), the piston (2) are slidably disposed in the inside of the cylinder body (1)；
Piston rod (4), which is fixedly connected on the piston (2), and has between the inner wall of the cylinder body (1)
First circumferential gap；
First guide sleeve (10), first guide sleeve (10) are at least partially disposed in the described first circumferential gap, and with institute
Stating between piston rod (4) has the second circumferential gap；
Second guide sleeve (12), second guide sleeve (12) are sheathed on the piston rod (4) and are at least partially situated at described
In second circumferential gap, second guide sleeve (12) and the piston rod (4) palette and can be opposite with the piston rod (4)
First guide sleeve (10) radial floating；
Nut cap (13), which is covered on the open end of the cylinder body (1), and makes the cylinder body (1), the first guide sleeve
(10) it is fixed to one another with the second guide sleeve (12) along axial direction.
2. hydraulic cylinder according to claim 1, which is characterized in that
First guide sleeve (10) has the first support portion being set in the described first circumferential gap and by this first
What support part extended protrudes from first auxiliary section in the described first circumferential gap；
Second guide sleeve (12) has the second support portion being set in the described second circumferential gap and by this second
What support part extended protrudes from second auxiliary section in the described second circumferential gap；
The nut cap (13) is covered on the outer wall of the cylinder body (1), the first auxiliary section and the second support portion, so that the cylinder body
(1), the first guide sleeve (10) and the second guide sleeve (12) are fixed to one another along axial direction.
3. hydraulic cylinder according to claim 2, which is characterized in that the end of the nut cap (13) and the cylinder body (1) it
Between there is first axis gap, the hold-down segment of first auxiliary section is set in the first axis gap；The nut cap (13)
There is the second axial gap between first auxiliary section, the hold-down segment of second support portion is set between second axial direction
In gap, the nut cap (13) along the first auxiliary section and the second support portion described in axial compression hold-down segment so that the cylinder body
(1), the first guide sleeve (10) and the second guide sleeve (12) are fixed to one another along axial direction.
4. hydraulic cylinder according to claim 1, which is characterized in that first guide sleeve (10) is towards the piston rod
(4) side is provided with composite bush (5) and conforms to the piston rod (4) by the composite bush (5).
5. hydraulic cylinder according to claim 1, which is characterized in that second guide sleeve (12) is towards the piston rod
(4) side is provided at least one sealing ring.
6. hydraulic cylinder according to claim 5, which is characterized in that the sealing ring includes being in contact simultaneously with piston rod (4)
It is capable of the slide mass of opposite sliding, the slide mass is connected with elastomer with the frictional dissipation for reducing the slide mass.
7. hydraulic cylinder according to claim 5, which is characterized in that second guide sleeve (12) is towards the piston rod
(4) side is provided with dustband (9), which is installed on separate the piston (2) of second guide sleeve (12)
One end.
8. hydraulic cylinder according to claim 1, which is characterized in that second guide sleeve (12) is oriented to towards described first
The side of set (10) is provided with static sealing ring (11), which, which has, is arranged towards first guide sleeve (10)
At least two seal lips.
9. hydraulic cylinder according to claim 1, which is characterized in that second guide sleeve (12) and first guide sleeve
(10) radial floating gap h is respectively arranged between the nut cap (13).
10. hydraulic cylinder according to claim 9, which is characterized in that the radial floating gap h is not less than 0.5mm.
11. hydraulic cylinder according to claim 1 to 10, which is characterized in that the second guide sleeve (12) direction
The side of the piston rod (4) is provided with guide ring (6).
12. a kind of fluid power system, which is characterized in that the fluid power system includes according to claim 1 to any in 11
Hydraulic cylinder described in one.
13. a kind of engineering machinery, which is characterized in that the engineering machinery includes hydraulic-driven system according to claim 12
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810701234.7A CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810701234.7A CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN108999830A true CN108999830A (en) | 2018-12-14 |
| CN108999830B CN108999830B (en) | 2020-12-15 |
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| CN201810701234.7A Active CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110273889A (en) * | 2019-07-08 | 2019-09-24 | 江苏恒立液压股份有限公司 | Empty van vehicle elevating ram |
| CN113404737A (en) * | 2021-05-24 | 2021-09-17 | 中联重科股份有限公司 | Hydraulic cylinder and hoisting device |
| CN118026026A (en) * | 2024-04-12 | 2024-05-14 | 山西泰宝科技有限公司 | Hydraulic support aqueous medium pushing jack sealing device |
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| CN203463402U (en) * | 2013-08-14 | 2014-03-05 | 贵州新安航空机械有限责任公司 | Shearing-force-resistance hydraulic cylinder |
| CN203822744U (en) * | 2014-03-28 | 2014-09-10 | 四川长江液压件有限责任公司 | Super-huge type ultrahigh-pressure hydraulic cylinder |
| CN207093504U (en) * | 2017-07-10 | 2018-03-13 | 无锡市长江液压缸厂 | A kind of high abrasion guide frame for hydraulic cylinder |
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| CN110273889A (en) * | 2019-07-08 | 2019-09-24 | 江苏恒立液压股份有限公司 | Empty van vehicle elevating ram |
| CN113404737A (en) * | 2021-05-24 | 2021-09-17 | 中联重科股份有限公司 | Hydraulic cylinder and hoisting device |
| CN118026026A (en) * | 2024-04-12 | 2024-05-14 | 山西泰宝科技有限公司 | Hydraulic support aqueous medium pushing jack sealing device |
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