CN105041757B - Double-thread screw-type swing hydraulic cylinder with piston and use method thereof - Google Patents
Double-thread screw-type swing hydraulic cylinder with piston and use method thereof Download PDFInfo
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- CN105041757B CN105041757B CN201510358405.7A CN201510358405A CN105041757B CN 105041757 B CN105041757 B CN 105041757B CN 201510358405 A CN201510358405 A CN 201510358405A CN 105041757 B CN105041757 B CN 105041757B
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Classifications
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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
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
Abstract
The invention discloses a double-thread screw-type swing hydraulic cylinder with a piston and a use method thereof, belongs to the field of hydraulic cylinders and solves the problems that a conventional swing hydraulic cylinder is complicated in structure and large in size and cannot be applied to environments which demand much on transmission precision and have narrow installation and use spaces. The double-thread screw-type swing hydraulic cylinder with the piston comprises an output threaded shaft, the piston, a hollow screw and an oil cylinder body and further comprises a nut, wherein the piston and the hollow screw are mutually connected and both arranged in the oil cylinder body; a through hole is formed in the piston; the output threaded shaft and the piston constitute a primary screw pair; the nut is fixed to the interior of the oil cylinder body, and the nut and the hollow screw constitute a secondary screw pair; and the primary screw pair and the secondary screw pair rotate in opposite directions. The double-thread screw-type swing hydraulic cylinder is simple in structure, small in size and precise in transmission; and during use, a relatively large swing angle can be finished by virtue of a relatively small stroke, and the double-thread screw-type swing hydraulic cylinder is suitable for being applied to environments which demand much on transmission precision and have narrow installation and use spaces.
Description
Technical field
The invention belongs to hydraulic cylinder field, specifically, be related to a kind of double thread piston screw formula oscillating motor and its
Using method.
Background technology
Double helix oscillating motor has king bolt lift angle, output, the Gao Cheng of high torque is realized by most compact structure
The remarkable advantage such as loading capability, shock resistance, zero leakage, flexible for installation, therefore it is widely used in the pendulum of aerial working platform vehicle process box
It is dynamic；The swing positioning of mining equiment drill boom；Agricultural equipment, the tire of industrial equipment or crawler belt are turned to；Clean fork truck etc. and perform machine
The swing of structure；Dumper, upset of refuse receptacle etc..The limited structure of installing space is particularly well-suited to, the swing of mechanism is realized.It is double
The ultimate principle of the spiral oscillating motor of thread piston is based on a multistage worm drive, by persistently loading on piston
On hydraulic coupling, linear motion is passed to into screw pair, be converted into rotary motion under the engagement of screw pair.With straight line
The increase of stroke, the anglec of rotation of rotary motion is consequently increased.The mistake that hydraulic coupling passes through an identical torque conversion
Journey, is converted directly to the moment of torsion of output shaft.Therefore, the torque for being exported on power transmission shaft size in the both direction for swinging
It is consistent.But what is faced during prior art manufacture Double helix oscillating motor is difficult more, due to the precision that it is driven
Have high demands, so no matter will just bring complete different state in a bit deficient in of the aspect such as selection, structure design, trim designs
Effect, very so-called a small discrepancy leads to a great error；There is complex structure in conventional Double helix oscillating motor, bulky, use
Life-span is low, and the shortcomings of be driven unstable grade, this is also that Double helix oscillating motor is developed so far still without the originals popularized in a large number
Therefore one, how to overcome these difficult, play the advantage of Double helix oscillating motor so as to be widely used in industry manufacture and raw
Produce, be the essential step for increasing productivity.
Chinese Patent Application No. 201410673194.1, the patent application document in publication date on April 1st, 2015, discloses
A kind of oscillating motor of two-stage screw transmission, the hydraulic cylinder mainly includes the cylinder body with cylindrical form interior surface, output structure
Part, piston sleeve, drive sleeve, two end caps only stopping component, only stop component and cylinder body two ends.The inwall of the drive sleeve
Female thread and the external screw thread of outer wall of piston sleeve constitute first order worm drive, the female thread of piston sleeve inwall and output
The external screw thread of the outer wall of the axle of component constitutes second level worm drive, and two-stage screw transmission is oppositely oriented.The invention
The drive sleeve can be floated in the certain limit in two spaces for only stopping component constraint, so as to effectively reduce to cylinder
Body, drive sleeve, piston sleeve, the requirement of the axiality of the axle of output link, reduce processing cost.And the drive sleeve can
To be dismantled, when screw conveyer or miscellaneous part can be changed when damaging to it.But the technical side of the disclosure of the invention
Case complex structure, volume is larger, is driven unstable, it is impossible to further apply transmission accuracy and have high demands, installing space is narrow and small
Environment.
The content of the invention
1st, the problem to be solved
It is bulky for existing oscillating motor complex structure, it is impossible to be applied to transmission accuracy and have high demands, install and make
With the problem of all very narrow and small environment in space, a kind of double thread piston screw formula oscillating motor of present invention offer and its user
Method, its apparatus structure is simple, small volume, and transmission is accurate；When using using less stroke by complete larger pivot angle, be adapted to
It is applied to transmission accuracy to have high demands, install and using all very narrow and small environment in space.
2nd, technical scheme
To solve the above problems, the present invention is adopted the following technical scheme that.
A kind of double thread piston screw formula oscillating motor, including output thread spindle, piston, cored screw and oil cylinder
Body, also including nut；Described piston is connected with cored screw, and piston is arranged in cylinder block with cored screw；Described
Cylinder block left end is provided with end cap；Described piston centre position is provided with through hole；Described output thread spindle sequentially passes through oil cylinder
Stretch in cored screw after through hole in the end cap of cylinder body left end, piston；Oil-feed oil pocket is formed between piston and end cap；Described
Oil-feed oil pocket is provided with oil-in；Described output thread spindle constitutes first order screw pair with piston；Described nut is fixed on
In cylinder block, nut is socketed on cored screw, and nut constitutes second level screw pair with cored screw；Described first order spiral shell
Rotation is secondary and second level screw pair oppositely oriented.
Preferably, described cylinder block is provided with cylinder bottom away from one end of left end end cap；Described cylinder bottom is comprising in one
Chamber, the inner chamber is communicated with inside cylinder block.
Preferably, the material of described output thread spindle and cored screw is 38CrMoAlA；Described piston and nut
Material is ZCuSnl0Pbl.
Preferably, the helical pitch of described first order screw pair is S1, the helical pitch of second level screw pair is S2, cored screw
Stroke is S3+ r, andWhereinDescribed
Preferably, described first order screw pair is trapezoidal thread, and its angle of thread is α, and lead angle is γ, spin friction
Factor is f, then its equivalent friction angleDescribed second level screw pair be trapezoidal thread, its thread form
Angle is α ', and lead angle is γ ', and spin friction factor is f, then equivalent friction angle
Preferably, described first order screw pair and the angle of thread of second level screw pair is 30 °；The first order spiral
Secondary number of starts is 22, and lead angle is 49.41 °；The number of starts of described second level screw pair is 35, and lead angle is
50.14°。
Preferably, the wall thickness value of described cylinder block is δ, and internal diameter is D, then
Preferably, it is threaded connection between described piston and cored screw, the screw thread is single thread, angle of thread is
α ", the pitch diameter of thread is d2, number of starts is N, and pitch is P, then
A kind of using method of double thread piston screw formula oscillating motor, its step is：
1) oil-in from oil-feed oil pocket is passed through high-voltage oil liquid, and high-voltage oil liquid promotes piston to move from left to right；
2) motion of piston produces motion stress from left to right to cored screw, forces cored screw to produce relative to nut
Raw rotary motion, i.e. second level screw pair starts rotary motion；The rotary motion reacts on piston, also band piston rotation fortune
It is dynamic；
3) rotary motion of piston forces the movement tendency being formed close between piston and output thread spindle, to overcome the fortune
Dynamic trend, exports the rotary motion that thread spindle produces rotation direction identical with piston, i.e. first order screw pair setting in motion；
4) one end output rotation torque that thread spindle is stretched out outside cylinder block is exported.
Preferably, step 2) in cored screw and nut be right-hand screw pair；Step 3) in piston and thread spindle be left-hand screw
It is secondary.
3rd, beneficial effect
Compared to prior art, beneficial effects of the present invention are：
(1) apparatus structure of the invention is simple, small volume, and transmission is accurate；The stroke of piston movement very little when using
Larger torque is exported by the amplification using oppositely oriented first order screw pair and second level screw pair, it is big to realize
The swing of angle, is suitably applied transmission accuracy and has high demands, installs and using all very narrow and small environment in space；
(2) apparatus of the present invention cylinder bottom arranges the assembling that can on the one hand facilitate this device, and on the other hand its inner chamber sets
Put the ability that cylinder block bears cored screw and nut axial force produced by relative motion at work that can improve, it is ensured that dress
Put stable, firm, reliable；
(3) apparatus of the present invention compact conformation, transmission accuracy has high demands, and the pressure being subjected to is big, and general material cannot expire
Foot requires that the output thread spindle of apparatus of the present invention and the material of cored screw are 38CrMoAlA；The material of piston and nut is
ZCuSnl0Pbl；The tensile strength and yield strength of analysis above two material, and with reference to the structure of this device, it can be found that on
Stating bi-material can enable device play optimal dominance, further improve apparatus of the present invention are stable, compact, output torque is big etc.
Advantage；
(4) apparatus of the present invention limit the pass of the stroke of first order screw pair, the helical pitch of second level screw pair and cored screw
It is to guarantee the corner that this device can make output thread spindle rotate over 360 ° in the case where piston runs less stroke；
(5) apparatus of the present invention limit the relation of first order screw pair, second level screw pair angle of thread and lead angle with true
Protect first order screw pair, second level screw pair and self-locking does not occur in the course of the work, realization is rotated while moving horizontally
Motion, it is final to drive the rotary motion for exporting thread spindle；
(6) restriction of apparatus of the present invention cylinder block wall thickness, can be in the case where this device working strength and life situations be met most
Bigization saves material cost and processing cost；
(7) it is threaded connection between apparatus of the present invention piston and cored screw, easy disassembly, maintenance, while its screw thread
The restriction of structure can make both meet self-locking requirement, not rotate against with cored screw in piston rotary movement
Motion；
(8) method of the present invention is simple to operate, can utilize the less stroke of apparatus of the present invention inner carrier, completes larger pendulum
Angle, can apply to transmission accuracy and has high demands, installs and using all very narrow and small environment in space.
Description of the drawings
Fig. 1 is the complete section schematic diagram of apparatus of the present invention；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is the top view of Fig. 1.
In figure：1st, thread spindle is exported；2nd, key；3rd, felt collar；4th, end cap；5th, pad；6th, end cap O-ring seal；7th, angular contact
Ball bearing；8th, piston；9th, piston O-ring seal；10th, cored screw；11st, cylinder block；12nd, nut；13rd, the O-shaped sealing of cylinder bottom
Circle；14th, screw；15th, cylinder bottom.
Specific embodiment
Describe the present invention below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2 and Figure 3, a kind of double thread piston screw formula oscillating motor, including export thread spindle 1, live
Plug 8, cored screw 10, cylinder block 11 and nut 12；The wall thickness value of cylinder block 11 is δ, and internal diameter is D, then
mm；The material of output thread spindle 1 and cored screw 10 is 38CrMoAlA；The material of piston 8 and nut 12 is ZCuSnl0Pbl；
It is threaded connection between piston 8 and cored screw 10, the screw thread is single thread, angle of thread is α ", the pitch diameter of thread is d2, spiral shell
Stricture of vagina head number is N, and pitch is P, thenPiston 8 is arranged on oil cylinder with cored screw 10
In cylinder body 11；Piston O-ring seal 9 is provided between the outer wall and the inwall of cylinder block 11 of piston 8, the left end of cylinder block 11 is provided with
End cap 4；The center of piston 8 is provided with through hole；Output thread spindle 1 is sequentially passed through in the end cap 4 of the left end of cylinder block 11, piston 8
Stretch into after through hole in cored screw 10；Oil-feed oil pocket is formed between piston 8 and end cap 4, oil-feed oil pocket is provided with oil-in；Output
Thread spindle 1 stretches out the one end outside cylinder block 11 and is provided between key 2, and the end and cylinder block 11 and is provided with angular contact ball bearing 7,
Angular contact ball bearing 7 is arranged on the inner side of end cap 4；Pad 5 and end cap O-ring seal are provided between end cap 4 and cylinder block 11
6, it is provided with felt collar 3 between end cap 4 and output thread spindle 1；Cylinder block 11 is provided with cylinder bottom 15, cylinder bottom away from one end of left end end cap
15 are fixed on cylinder block 11 by screw 14, and cylinder bottom O-ring seal 13 is provided between cylinder bottom 15 and cylinder block 11；Cylinder
Bottom 15 includes an inner chamber, and the inner chamber is communicated with inside cylinder block 11；Output thread spindle 1 constitutes first order spiral with piston 8
It is secondary；Nut 12 is fixed in cylinder block 11 near one end of cylinder bottom 15, and nut 12 constitutes second level spiral with cored screw 10
It is secondary；First order screw pair and second level screw pair it is oppositely oriented；The helical pitch of first order screw pair is S1, second level screw pair
Helical pitch is S2, the stroke of cored screw 10 is S3+ r, andWhereinDescribedFirst order screw pair is trapezoidal thread, and its angle of thread is α, and lead angle is γ, and spin friction factor is f, then
Its equivalent friction angleSecond level screw pair is trapezoidal thread, and its angle of thread is α ', and lead angle is
γ ', spin friction factor is f, then equivalent friction angle
A kind of using method of double thread piston screw formula oscillating motor, its step is：
1) oil-in from oil-feed oil pocket is passed through high-voltage oil liquid, and high-voltage oil liquid promotes piston 8 to move from left to right；
2) motion of piston 8 produces motion stress from left to right to cored screw 10, force cored screw 10 relative to
Nut 12 produces rotary motion, because cored screw 10 and nut 12 are right-hand screw pair, so from the viewing of the direction of end cap 4, it is hollow
The direction of rotation of screw rod 10 is for clockwise, i.e. second level screw pair starts rotary motion；The rotary motion reacts on work
Plug 8, also the band rotary motion of piston 8；
3) because piston 8 and thread spindle 1 are left-hand screw pair, the rotary motion of piston 8 forces piston 8 with output thread spindle 1
Between the movement tendency that is formed close to, to overcome the movement tendency, export thread spindle 1 produce and the identical rotation direction of piston 8 rotation
Motion, i.e. first order screw pair setting in motion；
4) one end output rotation torque that thread spindle 1 is stretched out outside cylinder block 11 is exported.
The present invention is further described below with reference to specific embodiment.
Embodiment 1
As shown in Figure 1, Figure 2 and Figure 3, a kind of double thread piston screw formula oscillating motor, including export thread spindle 1, live
Plug 8, cored screw 10, cylinder block 11 and nut 12；The wall thickness value of cylinder block 11 is δ=10mm, and internal diameter is D=50mm,
ThenThe material of output thread spindle 1 and cored screw 10 is 38CrMoAlA；Piston 8 and nut 12
Material is ZCuSnl0Pbl；It is threaded connection between piston 8 and cored screw 10, the screw thread is single thread, angle of thread is
=60 ° of α ", the pitch diameter of thread is d2=41.026mm, number of starts is N=5, and pitch is P=1.5mm, thenPiston 8 is arranged on cylinder block 11 with cored screw 10
It is interior；Piston O-ring seal 9 is provided between the outer wall and the inwall of cylinder block 11 of piston 8, the left end of cylinder block 11 is provided with end cap
4,；The center of piston 8 is provided with through hole；Output thread spindle 1 sequentially passes through the through hole in the end cap 4 of the left end of cylinder block 11, piston 8
After stretch in cored screw 10；Oil-feed oil pocket is formed between piston 8 and end cap 4, oil-feed oil pocket is provided with oil-in；Output screw thread
Axle 1 stretches out the one end outside cylinder block 11 and is provided between key 2, and the end and cylinder block 11 and is provided with angular contact ball bearing 7, corner connection
Tactile ball bearing 7 is arranged on the inner side of end cap 4；Pad 5 and end cap O-ring seal 6 are provided between end cap 4 and cylinder block 11, are held
Felt collar 3 is provided between lid 4 and output thread spindle 1；Cylinder block 11 is provided with cylinder bottom 15 away from one end of left end end cap, and cylinder bottom 15 leads to
Cross screw 14 to be fixed on cylinder block 11, and cylinder bottom O-ring seal 13 is provided between cylinder bottom 15 and cylinder block 11；Cylinder bottom 15
Comprising an inner chamber, the inner chamber is communicated with inside cylinder block 11；Output thread spindle 1 constitutes first order screw pair with piston 8；Spiral shell
Female 12 are fixed in cylinder block 11 near one end of cylinder bottom 15, and nut 12 constitutes second level screw pair with cored screw 10；The
One-level screw pair is left hand thread, and second level screw pair is right-handed thread；The helical pitch for selecting first order screw pair is S1=NP=
22 × 5mm=110mm, then the helical pitch of second level screw pair is S2≈ 176mm, according to formulaSelect hollow spiral shell
The stroke of bar 10 is S3+ r=70+r, then the angle of the rotation of cored screw be：Output thread spindle
Relative to cored screw rotation angle be：The anglec of rotation of output thread spindle output is α=α1
+α2=143 °+229 °=372 ° 360 ° of ＞；To guarantee that piston has enough activity spaces, r=6mm herein；First order screw pair
For trapezoidal thread, its angle of thread is α=30 °, and lead angle is γ=49.41 °, and spin friction factor is f=0.08, thread head
Number is N=22, then its equivalent friction angle Second level screw pair is trapezoidal
Screw thread, its angle of thread is α '=30 °, and lead angle is γ '=50.14 °, and spin friction factor is f=0.08, and number of starts is
N=35, then equivalent friction angle
A kind of using method of double thread piston screw formula oscillating motor, its step is：
1) oil-in from oil-feed oil pocket is passed through high-voltage oil liquid, and high-voltage oil liquid promotes piston 8 to move from left to right；
2) motion of piston 8 produces motion stress from left to right to cored screw 10, force cored screw 10 relative to
Nut 12 produces rotary motion, because cored screw 10 and nut 12 are right-hand screw pair, so watching (such as Fig. 2 from the direction of end cap 4
Shown direction), the direction of rotation of cored screw 10 is for clockwise, i.e. second level screw pair starts rotary motion；The rotation
Motion reacts on piston 8, also the band rotary motion of piston 8；
3) because piston 8 and thread spindle 1 are left-hand screw pair, the rotary motion of piston 8 forces piston 8 with output thread spindle 1
Between the movement tendency that is formed close to, to overcome the movement tendency, export thread spindle 1 produce and the identical rotation direction of piston 8 rotation
Motion, i.e. first order screw pair setting in motion；
4) one end output rotation torque that thread spindle 1 is stretched out outside cylinder block 11 is exported.
In the present embodiment, export thread spindle 1 material be 38CrMOALA, its anti-yield strength σs=785MPa, then can be with
Obtain exporting the allowable stress of thread spindle 1And according to working condition, export thread spindle 1
The torsional strength being subject in normal conditions is：
In formula：
WtFor the Torsion Section coefficient of screw flight section
Moment of torsionDraw F=7949.5N
d1For external screw thread path 26.5mm；d2For pitch diameter of external thread 30mm
Then σp≥σca=78.126 (N/mm2), it can be ensured that device still keep in the case where high accuracy is run it is stable, firmly and
It is reliable, and long service life；In the same manner, the selection of cored screw 10 is also engaged with its structure, it is ensured that device is transported in high accuracy
Still keep stable, firmly and reliable under row, and long service life.
Embodiment 2
It is same as Example 1, except that, first order screw pair is right-handed thread, and second level screw pair is left-handed spiral shell
Stricture of vagina.
Claims (5)
1. a kind of double thread piston screw formula oscillating motor, including output thread spindle (1), piston (8), cored screw (10) and
Cylinder block (11), it is characterised in that：Also include nut (12)；Described piston (8) is connected with cored screw (10), piston
(8) it is arranged in cylinder block (11) with cored screw (10)；Described cylinder block (11) left end is provided with end cap (4)；It is described
Piston (8) centre be provided with through hole；Described output thread spindle (1) sequentially passes through the end cap of cylinder block (11) left end
(4), stretch into after the through hole in piston (8) in cored screw (10)；Oil-feed oil pocket is formed between piston (8) and end cap (4)；It is described
Oil-feed oil pocket be provided with oil-in；Described output thread spindle (1) constitutes first order screw pair with piston (8)；Described spiral shell
Female (12) are fixed in cylinder block (11), and nut (12) is socketed on cored screw (10), nut (12) and cored screw
(10) second level screw pair is constituted；Described first order screw pair and second level screw pair it is oppositely oriented；Described output spiral shell
The material of stricture of vagina axle (1) and cored screw (10) is 38CrMoAlA；Described piston (8) and the material of nut (12) be
ZCuSnl0Pbl；The helical pitch of described first order screw pair is S1, the helical pitch of second level screw pair is S2, cored screw (10)
Stroke is S3+ r, andWhereinDescribed
2. a kind of double thread piston screw formula oscillating motor according to claim 1, it is characterised in that：Described first
Level screw pair is trapezoidal thread, and its angle of thread is α, and lead angle is γ, and spin friction factor is f, then its equivalent friction angleDescribed second level screw pair is trapezoidal thread, and its angle of thread is α ', and lead angle is γ ', is revolved
It is f to turn friction factor, then equivalent friction angle
3. a kind of double thread piston screw formula oscillating motor according to claim 2, it is characterised in that：Described first
The angle of thread of level screw pair and second level screw pair is 30 °；The number of starts of the first order screw pair is 22, lead angle
For 49.41 °；The number of starts of described second level screw pair is 35, and lead angle is 50.14 °.
4., according to a kind of double thread piston screw formula oscillating motor described in claims 1 to 3 any one, its feature exists
In：The wall thickness value of described cylinder block (11) is δ, and internal diameter is D, then
5. a kind of double thread piston screw formula oscillating motor according to claim 4, it is characterised in that：Described piston
(8) it is threaded connection and cored screw (10) between, the screw thread is single thread, spin friction factor is f, and angle of thread is
α ", the pitch diameter of thread is d2, number of starts is N, and pitch is P, then
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| CN201510358405.7A CN105041757B (en) | 2015-06-25 | 2015-06-25 | Double-thread screw-type swing hydraulic cylinder with piston and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105697851B (en) * | 2016-04-08 | 2018-06-26 | 洛阳雷斯达传动有限公司 | A kind of worm drive hydraulic executer for valve driving |
| CN107060661A (en) * | 2017-04-05 | 2017-08-18 | 蚌埠市行星工程机械有限公司 | A kind of spiral wobble gear case changed for bull stick |
| CN112012979A (en) * | 2020-08-24 | 2020-12-01 | 南京市江宁区艾机机械厂 | Integrated hydraulic oil cylinder with power |
| CN113819108B (en) * | 2021-09-29 | 2023-07-14 | 辽宁工程技术大学 | Digital spiral swing fluid cylinder |
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| JP2009041725A (en) * | 2007-08-10 | 2009-02-26 | Takezawa Hydrotec:Kk | Hydraulic actuator |
| NL2010256C2 (en) * | 2013-02-06 | 2014-08-07 | Hfx Res B V | CYLINDER COMPOSITION. |
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| CN2592937Y (en) * | 2002-11-25 | 2003-12-17 | 朱学琳 | Wide-angle fluid rotary cylinder |
| CN102252000A (en) * | 2010-05-20 | 2011-11-23 | 李贵祥 | Double-helix oscillating pressure cylinder |
| CN203476882U (en) * | 2013-08-15 | 2014-03-12 | 大连益利亚工程机械有限公司 | Swing oil cylinder |
| CN103742476A (en) * | 2013-12-30 | 2014-04-23 | 中船重工中南装备有限责任公司 | Spirally swinging hydraulic cylinder |
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