CN107289058B - A kind of damper damping regulating valve - Google Patents
A kind of damper damping regulating valve Download PDFInfo
- Publication number
- CN107289058B CN107289058B CN201710499846.8A CN201710499846A CN107289058B CN 107289058 B CN107289058 B CN 107289058B CN 201710499846 A CN201710499846 A CN 201710499846A CN 107289058 B CN107289058 B CN 107289058B
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- Prior art keywords
- valve
- piston
- compression
- spring
- pressure
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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.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
- F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
- F16F9/464—Control of valve bias or pre-stress, e.g. electromagnetically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a kind of dampers to damp regulating valve, it include the electromagnet being sequentially sleeved on piston rod, adjustment spring and adjustment disk including piston body, piston ring, compression valve, compressed spring, rebuilt valve, return spring, compression pressure-bearing plate, recovery pressure-bearing plate and damping adjustment device, the damping adjustment device；For the present invention in compression travel, compression pressure-bearing plate is P1 by oil liquid pressure, and compressed spring is compressed, and compression valve valve port part generates gap；It restores in stroke, restoring pressure-bearing plate by oil liquid pressure is P2, and return spring is compressed, and rebuilt valve valve port part generates gap, and oil liquid forms damping force when flowing through gap.By controlling the power-off and energization of electromagnet, damper damping regulating valve can provide big damping and two kinds of working conditions of small damping for automobile absorber.It can be not only used for double-drum type vibration damper, it can also be used to single cylinder aerating damper.The advantages that damper, which damps regulating valve, has structure simple, applied widely, and number of parts is few.
Description
Technical field
The present invention relates to a kind of vehicular shock absorbers, and in particular to damps regulating valve to a kind of damper.
Background technique
Damper is the necessary parts of motor vehicles, can either inhibit the bounce of vehicle during high speed driving, is improved
The ground connection performance of tire improves the safety of traveling, but can reduce vehicle it is anxious accelerate, bring to a halt, take a sudden turn when transverse-vibration
It is dynamic, improve the operational stability of vehicle.Traditional automobile absorber is mainly by the liquid of the nonadjustable spring of rigidity and damping fixation
Damper composition is pressed, it is poor to the applicability of different road conditions, it is difficult to meet the different driving habit of driver.
By the document " research of vehicle variable-damping shock semi-active suspension " of Li Shisheng it is found that existing damping can adjust and reduce
Device is shaken since structure is complicated, number of components is more, technique requires height, and higher cost is mainly used for superior automobile, it is difficult to low in
It is popularized in shelves automobile.Therefore the vibration damper with adjustable damping that a kind of structure is simple, production cost is low is needed, it is low and middle-grade to meet
The demand of user vehicle.
Summary of the invention
The purpose of the present invention is providing regarding to the issue above, a kind of structure is simple, applied widely, number of parts is few subtracts
It shakes device and damps regulating valve, which damps regulating valve in compression travel, and compression pressure-bearing plate is P1, compression by oil liquid pressure
Spring is compressed, and compression valve valve port part generates gap；It restores in stroke, restoring pressure-bearing plate by oil liquid pressure is P2, is restored
Spring is compressed, and rebuilt valve valve port part generates gap, and oil liquid forms damping force when flowing through gap.Pass through the disconnected of control electromagnet
Electricity and energization, damper damping regulating valve can provide big damping and two kinds of working conditions of small damping for automobile absorber.Both
It can be used for double-drum type vibration damper, it can also be used to single cylinder aerating damper.The damper, which damps regulating valve, has structure simple, fits
It is wide with range, the advantages that number of parts is few.
The technical scheme is that a kind of damper damps regulating valve, including piston body, piston ring, compression valve, compression
Spring, return spring, compression pressure-bearing plate, restores pressure-bearing plate and damping adjustment device at rebuilt valve；
The damping adjustment device includes the electromagnet being sequentially sleeved on piston rod, adjustment spring and adjustment disk；The work
Cock body is provided centrally with centre bore, counterbore, symmetrical piston holeWith symmetrical piston holeThe piston
HoleBottom be equipped with oil outlet II；One end of the piston rod passes through centre bore and fastens, and the adjustment disk is mounted on piston
In the counterbore of body；Oil outlet I and symmetrically arranged round tube are symmetrically arranged on the adjustment disk；
The compression valve is mounted on the piston hole of piston bodyIn, the oil outlet I and piston holeFace；The pressure
One end of contracting spring is connect with compression valve, and the other end is against the bottom of adjustment disk, and the compression pressure-bearing plate is mounted under piston body
Side is connect with the valve port of compression valve；
The rebuilt valve is mounted in the round tube of adjustment disk, and the round tube is mounted on piston holeIt is interior；The return spring
One end connect with rebuilt valve, the other end is against piston holeBottom, the recovery pressure-bearing plate be mounted on above adjustment disk with
The valve port of rebuilt valve connects；
The compression valve and rebuilt valve tail portion are provided centrally with normal open hole；
The adjustment spring rigidity is K1, return spring rigidity is K2, compressed spring rigidity is K3, wherein K12 (K of >2+
K3).To guarantee that adjustment disk is in low level in the power-off state.
In above scheme, semicircle sulculus, installation sealing ring and piston in the semicircle sulculus are provided on the round tube
The piston hole of bodyForm dynamic sealing；
The circumferential edges of the adjustment disk are equipped with slot, and the counterbore of mounting O-shaped rings and piston body forms dynamic sealing in slot.
In above scheme, two groups of oil outlets I are symmetrically arranged on the adjustment disk, oil outlet I described in every group is four equal
The small sircle hole of even arrangement；
The piston holeBottom be equipped with two groups of oil outlets II, every group of oil outlet II is four roundlets being evenly arranged
Hole.
In above scheme, the stiffness K of the return spring2With the stiffness K of compressed spring3Meet the following conditions: K2> K3。
To guarantee that damper obtains biggish recovery damping.
In above scheme, the piston body outer round surface is provided with rectangle sulculus, is equipped with piston ring in rectangle sulculus.
In above scheme, the compression valve and rebuilt valve are rotary structure, the valve port part point of compression valve and rebuilt valve
It Wei not conical structure；The piston holeLower end be bellmouth, the upper end of the round tube is bellmouth.
In above scheme, conical structure, the piston hole of the compression valve and rebuilt valve valve portThe bellmouth of lower end and
The taper β of the bellmouth of round tube upper end is 1:5.To guarantee the aperture of valve port with compressed spring or return spring decrement
Increase and increases.
In above scheme, the compression valve and rebuilt valve tail portion are respectively arranged with the spring base connecting with spring.
In above scheme, be provided on the piston rod installation piston body positioning surface, install electromagnet positioning surface and
The confined planes of installation and adjustment disk.
In above scheme, there is identical pre compressed magnitude △ L in the compressed spring and return spring during installation1。
Compared with prior art, the beneficial effects of the present invention are:
1. damper of the present invention damps regulating valve, dual-tube shock absorber not only can be applied to, but also can be used for monotubular and fill
Gas type vibration absorber, it is applied widely；
2. damper damping regulating valve of the present invention has the characteristics that structure is simple, number of parts is few, life can reduce
Cost is produced, and then can be applied to low and middle-grade automobiles；
3. the present invention is in actual production, pressure-bearing plate can be restored by change and compress area, the return spring of pressure-bearing plate
Change initial damping force with the methods of the rigidity of compressed spring, convenient for debugging.
Detailed description of the invention
Fig. 1 is compression valve installation diagram of the present invention；
Fig. 2 is rebuilt valve installation diagram of the present invention；
Fig. 3 is inventive piston body top view figure；
Fig. 4 is inventive piston body cross-sectional view；
Fig. 5 is adjustment disk structural schematic diagram of the present invention；
Compression travel working condition chart when Fig. 6 is electromagnet of the present invention power-off；
Fig. 7 restores stroke working condition chart when being electromagnet of the present invention power-off；
Fig. 8 is compression travel working condition chart when electromagnet of the present invention is powered；
Fig. 9 is that electromagnet of the present invention restores stroke working condition chart when being powered.
In figure, 1- piston rod；2- electromagnet；3- adjustment spring；4- adjustment disk；401- oil outlet I；402- semicircle is small
Slot；403- round tube；5-O type circle；6- compressed spring；7- compression valve；8- compresses pressure-bearing plate；9- restores pressure-bearing plate；10- rebuilt valve；
11- piston body；1101- confined planes；1102- counterbore；1103- centre bore；1104- oil outlet II；1105- rectangle sulculus；1106-
Piston hole1107- piston hole12- return spring；13- sealing ring；14- piston ring；15- gasket；16- nut.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description, but protection scope of the present invention
It is not limited to this.
Fig. 1 and Fig. 2 show a kind of embodiment of damper damping regulating valve of the present invention, the damper damping
Regulating valve includes piston body 11, piston ring 14, compression valve 7, compressed spring 6, rebuilt valve 10, return spring 12, compression pressure-bearing plate
8, pressure-bearing plate 9 and damping adjustment device are restored.
The damping adjustment device includes the electromagnet 2 being sequentially sleeved on piston rod 1, adjustment spring 3 and adjustment disk 4.
As shown in Figures 3 and 4, it is symmetrically arranged at least two groups on the piston body 11 and amounts to four piston holes, two symmetrical
The internal diameter of distribution is expressed asPiston holeIt is expressed as with two symmetrical internal diametersPiston hole
The piston holeBottom be equipped with two groups of oil outlets II 1104, every group of oil outlet II 1104 is four and is evenly arranged
Small sircle hole；The piston body 11 is provided centrally with centre bore 1103 and counterbore 1102.11 outer round surface of the piston body setting
There are the rectangle sulculus 1105 for ring installation 14, piston holeLower end is bellmouth, and taper β is 1:5.
As shown in figure 5, being symmetrical arranged on the adjustment disk 4, there are two round tubes 403；Semicircle is provided on the round tube 403
Sulculus 402, for installing sealing ring 13；403 outer diameter of round tube of the adjustment disk 4 is less than piston holeInternal diameter, it is described
Round tube 403 is mounted on piston holeIt is interior；The upper end of the round tube (403) is bellmouth, and taper β is 1:5；The adjusting
Two groups of oil outlets I 401 are symmetrically arranged on disk 4, every group is four small sircle holes being evenly arranged.
The compression valve 7 and rebuilt valve 10 are rotary structure, and valve port part is conical structure, and taper β is 1:5,
Tail portion is provided with for pacifying spring-loaded spring base, is provided centrally with elongated normal open hole；The recovery pressure-bearing plate 9 and compression pressure-bearing
Piece 8 is thin discs structure, plays a part of to increase compression area and limit；Piston body 11 and electromagnetism are provided on the piston rod 1
The positioning surface of iron 2 and the confined planes of adjustment disk 4；3 rigidity of adjustment spring is K1, 12 rigidity of return spring is K2, compression
6 rigidity of spring is K3, wherein K12 (K of >2+K3), K2> K3。
The adjustment spring 3 is mounted between electromagnet 2 and adjustment disk 4.The compression valve 7 is mounted on the work of piston body 11
ConsentIn, the circular conical surface and piston hole of 7 valve port of compression valveCircular conical surface fitting；The compression pressure-bearing plate 8 with
Compression valve 7 is connected through a screw thread；The compressed spring 6 is mounted on the spring base of compression valve 7.
The rebuilt valve 10 is mounted in the round tube 403 of adjustment disk 4, circular conical surface and the round tube 403 of 10 valve port of rebuilt valve
Circular conical surface fitting；The recovery pressure-bearing plate 9 is connected through a screw thread with rebuilt valve 10；The return spring 12 and 10 spring of rebuilt valve
Seat connection.
The adjustment disk 4 cooperates with piston body 11, and adjustment disk round tube 403 is mounted on the piston hole of piston body 11
It is interior, dynamic sealing is formed by sealing ring 13；The oil outlet I 401 of the adjustment disk and the piston hole of piston body 11Just
It is right；The circumferential edges of the adjustment disk 4 are equipped with slot, and mounting O-shaped rings (5) in slot pass through the counterbore of O-ring 5 and piston body 11
1102 form dynamic sealing.The piston body 11 is compressed by gasket and nut.The piston ring 14 is mounted on 11 outer circle of piston body
In the rectangle sulculus 1105 on surface, damper working chamber is divided into compression chamber and recovery chamber.
As shown in Figures 6 and 7, under 2 off-position of electromagnet, under the elastic force effect of adjustment spring 3, at adjustment disk 4
In low level, the decrement of compressed spring 6 and return spring 12 is △ L1.The working condition of damper damping regulating valve are as follows:
A) compression travel: piston rod 1 moves downward, and compression chamber oil liquid is compressed, pressure representative P1；Before not reaching cracking pressure,
Oil liquid flows into recovery chamber by the normal open hole of compression valve 7；After pressure P1 reaches cracking pressure, compressed spring 6 is compressed, compression
The valve port part of valve 7 generates gap, and a part of oil liquid passes through the normal open hole of compression valve 7, and another part oil liquid is entered by gap
Recovery chamber；When pressure P1 continues to increase, compressed spring 6 and adjustment spring 3 are compressed, and adjustment disk 4 moves up.B) row is restored
Journey: piston rod 1 moves upwards, and recovery chamber oil liquid is compressed, pressure representative P2；Before not reaching cracking pressure, oil liquid passes through
The normal open hole of rebuilt valve 10 enters compression chamber；After pressure P2 reaches cracking pressure, return spring 12 is compressed, rebuilt valve 10
Valve port part generates gap, and a part of oil liquid passes through the normal open hole of rebuilt valve 10, and another part oil liquid enters compression by gap
Chamber.Under 2 off-position of electromagnet, the compression damping of damper is mainly by the stiffness K of compressed spring 63It is rigid with adjustment spring 3
Spend K1It codetermines, restores damping mainly by the stiffness K of return spring2It determines.
As shown in FIG. 8 and 9, under 2 energized state of electromagnet, under the suction of electromagnet 2, adjustment spring 3 is compressed,
Adjustment disk 4 is fixed to be in high-order, and the decrement of compressed spring 6 and return spring 12 is △ L2, △ L2< △ L1.Damper resistance
The working condition of Buddhist nun's regulating valve are as follows: a) compression travel: piston rod 1 moves downward, and compression chamber oil liquid is compressed, and pressure representative is
P1；Before not reaching cracking pressure, oil liquid flows into recovery chamber by the normal open hole of compression valve 7；When pressure P1 reaches cracking pressure
Afterwards, compressed spring 6 is compressed, and the valve port part of compression valve 7 generates gap, and a part of oil liquid passes through the normal open hole of compression valve 7, separately
A part of oil liquid enters recovery chamber by gap.B) restore stroke: piston rod 1 moves upwards, and recovery chamber oil liquid is compressed, pressure
It is expressed as P2；Before not reaching cracking pressure, oil liquid enters compression chamber by the normal open hole of rebuilt valve 10；When pressure P2 reaches out
After valve pressure, return spring 12 is compressed, and gap occurs in the valve port part of rebuilt valve 10, and a part of oil liquid passes through rebuilt valve 10
Normal open hole, another part oil liquid enter compression chamber by gap.Under 2 energized state of electromagnet, the compression damping master of damper
It will be by the stiffness K of compressed spring 63It determines, restores damping mainly by the stiffness K of return spring 122It determines.
Although not each embodiment only includes one it should be appreciated that this specification describes according to various embodiments
A independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should will say
As a whole, the technical solutions in the various embodiments may also be suitably combined for bright book, and forming those skilled in the art can be with
The other embodiments of understanding.
The series of detailed descriptions listed above are illustrated only for possible embodiments of the invention,
The protection scope that they are not intended to limit the invention, it is all without departing from equivalent embodiment made by technical spirit of the present invention or change
It should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of damper damps regulating valve, which is characterized in that including piston body (11), piston ring (14), compression valve (7), pressure
Contracting spring (6), return spring (12), compression pressure-bearing plate (8), restores pressure-bearing plate (9) and damping adjustment device at rebuilt valve (10)；
The damping adjustment device includes electromagnet (2), adjustment spring (3) and the adjustment disk (4) being sequentially sleeved on piston rod (1)；
The piston body (11) is provided centrally with centre bore (1103), counterbore (1102), symmetrical piston hole With it is right
Claim the piston hole of distributionThe piston holeBottom be equipped with oil outlet II (1104)；The piston rod
(1) one end passes through centre bore (1103) and fastens, and the adjustment disk (4) is mounted in the counterbore (1102) of piston body (11)；
Oil outlet I (401) and symmetrically arranged round tube (403) are symmetrically arranged on the adjustment disk (4)；
The compression valve (7) is mounted on the piston hole of piston body (11)In, the oil outlet I (401) and piston holeFace；One end of the compressed spring (6) is connect with compression valve (7), and the other end is against the bottom of adjustment disk (4)
Portion, compression pressure-bearing plate (8) are mounted below piston body (11) and connect with the valve port of compression valve (7)；
The rebuilt valve (10) is mounted in the round tube (403) of adjustment disk (4), and the round tube (403) is mounted on piston holeIt is interior；One end of the return spring (12) is connect with rebuilt valve (10), and the other end is against piston hole
Bottom, recovery pressure-bearing plate (9) is mounted on above adjustment disk (4) and connect with the valve port of rebuilt valve (10)；
The compression valve (7) and rebuilt valve (10) tail portion are provided centrally with normal open hole；
Adjustment spring (3) rigidity is K1, return spring (12) rigidity is K2, compressed spring (6) rigidity is K3, wherein K1> 2
(K2+K3)。
2. damper according to claim 1 damps regulating valve, which is characterized in that be provided with semicircle on the round tube (403)
Shape sulculus (402), the piston hole of interior installation sealing ring (13) and piston body (11) of semicircle sulculus (402)
Form dynamic sealing；
The circumferential edges of the adjustment disk (4) are equipped with slot, counterbore (1102) shape of mounting O-shaped rings (5) and piston body (11) in slot
At dynamic sealing.
3. damper according to claim 1 damps regulating valve, which is characterized in that be symmetrical arranged on the adjustment disk (4)
There are two groups of oil outlets I (401), oil outlet I (401) described in every group is four small sircle holes being evenly arranged；
The bottom of the piston hole φ b (1107) is equipped with two groups of oil outlets II (1104), and every group of oil outlet II (1104) is four
The small sircle hole being evenly arranged.
4. damper according to claim 1 damps regulating valve, which is characterized in that the stiffness K of the return spring (12)2
With the stiffness K of compressed spring (6)3Meet the following conditions: K2> K3。
5. damper according to claim 1 damps regulating valve, which is characterized in that piston body (11) outer round surface is set
It is equipped with rectangle sulculus (1105), piston ring (14) is installed in rectangle sulculus (1105).
6. damper according to claim 1 damps regulating valve, which is characterized in that the compression valve (7) and rebuilt valve
It (10) is rotary structure, the valve port part of compression valve (7) and rebuilt valve (10) is respectively conical structure；The piston hole Lower end be bellmouth, the upper end of the round tube (403) is bellmouth.
7. damper according to claim 6 damps regulating valve, which is characterized in that the compression valve (7) and rebuilt valve
(10) conical structure of valve port, piston holeThe taper of the bellmouth of bellmouth and round tube (403) upper end of lower end
β is 1:5.
8. damper according to claim 1 damps regulating valve, which is characterized in that the compression valve (7) and rebuilt valve
(10) tail portion is respectively arranged with the spring base connecting with spring.
9. damper according to claim 1 damps regulating valve, which is characterized in that be provided with peace on the piston rod (1)
It fills the positioning surface of piston body (11), the positioning surface of electromagnet (2) and the confined planes of installation and adjustment disk (4) is installed.
10. damper according to claim 1 damps regulating valve, which is characterized in that the compressed spring (6) and recovery bullet
There is identical pre compressed magnitude △ L during installation in spring (12)1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710499846.8A CN107289058B (en) | 2017-06-27 | 2017-06-27 | A kind of damper damping regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710499846.8A CN107289058B (en) | 2017-06-27 | 2017-06-27 | A kind of damper damping regulating valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107289058A CN107289058A (en) | 2017-10-24 |
| CN107289058B true CN107289058B (en) | 2019-02-05 |
Family
ID=60098059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710499846.8A Expired - Fee Related CN107289058B (en) | 2017-06-27 | 2017-06-27 | A kind of damper damping regulating valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN107289058B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906155B (en) * | 2017-11-08 | 2020-06-30 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Gap-adjustable fluid damping device |
| CN108319395B (en) * | 2018-02-08 | 2020-12-25 | 深圳市志凌伟业技术股份有限公司 | Modern high-pressure-bearing touch panel |
| CN108488296B (en) * | 2018-03-21 | 2020-03-31 | 武汉船用机械有限责任公司 | Hydraulic buffer |
| CN109094493A (en) * | 2018-08-15 | 2018-12-28 | 安徽奥丰汽车配件有限公司 | A kind of automobile rubber front bumper |
| CN109505911B (en) * | 2018-11-30 | 2024-02-20 | 宁波市鄞州通力液压电器厂 | Damping valve for vehicle |
| CN110905960B (en) * | 2019-11-29 | 2021-11-30 | 中国北方车辆研究所 | Two-way discharge vibration damping valve |
| CN115325079A (en) * | 2022-09-06 | 2022-11-11 | 北京理工大学 | Two-way damping valve component of shock absorber |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3704712A1 (en) * | 1987-02-14 | 1988-08-25 | Bilstein August Gmbh Co Kg | Adjustable shock absorber, especially for motor vehicles |
| JP2010054009A (en) * | 2008-08-29 | 2010-03-11 | Hitachi Automotive Systems Ltd | Shock absorber |
| CN202768713U (en) * | 2012-09-06 | 2013-03-06 | 宁波凯瑞汽车零部件有限公司 | Piston component of shock absorber |
| CN105114513B (en) * | 2015-09-16 | 2017-02-01 | 湖南科技大学 | Speed and displacement dual-lock pressure-limiting type viscous damper |
-
2017
- 2017-06-27 CN CN201710499846.8A patent/CN107289058B/en not_active Expired - Fee Related
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| CN107289058A (en) | 2017-10-24 |
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Granted publication date: 20190205 Termination date: 20190627 |