CN109899617A - A kind of hydraulic damper and hydraulic damping device assembly - Google Patents
A kind of hydraulic damper and hydraulic damping device assembly Download PDFInfo
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- CN109899617A CN109899617A CN201910217381.1A CN201910217381A CN109899617A CN 109899617 A CN109899617 A CN 109899617A CN 201910217381 A CN201910217381 A CN 201910217381A CN 109899617 A CN109899617 A CN 109899617A
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Abstract
The embodiment of the invention provides a kind of hydraulic damper and hydraulic damping device assemblies, wherein hydraulic damper includes: plate structure, feed liquor groove, the first groove, goes out liquid groove；The feed liquor groove, first groove are all set in the first plate face of the plate structure, and the side wall of the feed liquor groove is connected to the side wall of first groove；The liquid groove out is set in the second plate face of the plate structure, and the liquid groove out is connected to the bottom wall of first groove.Hydraulic damper provided in an embodiment of the present invention increases the damping of damper by the quantity of damping hole, without the smaller damping to increase damper that the through-hole diameter of damper is arranged, the phenomenon that reducing damper blocking, to reduce the probability that damper breaks down, and each damping hole is arranged on a plate structure, keep the volume of damper smaller, it is easier to process.
Description
Technical field
The present invention relates to technical field of hydraulic, more particularly to a kind of hydraulic damper and hydraulic damping device assembly.
Background technique
Hydraulic damper be it is a kind of provide the device of the resistance of motion, depletion kinergety for liquid communication in hydraulic device,
It can be used for vibration damping energy dissipating, be widely applied in fields such as aerospace, automobile, steel, building, power generations.
A kind of existing damper structure are as follows: one through-hole of setting in the plate face of plate structure, the through-hole, that is, damping hole,
Wherein, the damping size of damper is determined that the through-hole diameter of damper is smaller by the diameter of through-hole, and the damping of damper is bigger.
It when liquid flows through damper, flows out from the through-hole of damper, since liquid is damped the resistance of device, is flowed out from damper through-hole
Hydraulic shock can reduce.
However, inventor has found in the implementation of the present invention, at least there are the following problems for the prior art: due to damping
The damping size of device is determined by the diameter of through-hole, in order to increase the damping of damper, it will usually by the diameter of through-hole be arranged compared with
It is small, in this way it is easy to cause damper to block, to increase the probability that damper breaks down.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of hydraulic damper and hydraulic damping device assembly, to reduce damper
The phenomenon that blocking, to reduce the probability that damper breaks down.Specific technical solution is as follows:
In a first aspect, the embodiment of the invention provides a kind of hydraulic damper, the damper include: plate structure, into
Liquid groove, goes out liquid groove at the first groove；
The feed liquor groove, first groove are all set in the first plate face of the plate structure, and the feed liquor is recessed
The side wall of slot is connected to the side wall of first groove；
The liquid groove out is set in the second plate face of the plate structure, liquid groove and first groove out
Bottom wall connection.
Optionally, the damper further include: the second groove；
Second groove is set in second plate face, the bottom of the bottom wall of second groove and first groove
Wall connection；
The side wall of second groove is connected to the liquid groove out.
Optionally, the damper further include: third groove, the 4th groove, the 5th groove, the 6th groove；
The third groove is set in second plate face, the side of the side wall of the third groove and second groove
Wall connection；
4th groove, the 5th groove are set in first plate face, the bottom wall of the 4th groove and institute
The bottom wall connection of third groove is stated, the side wall of the 4th groove is connected to the side wall of the 5th groove；
6th groove is set in second plate face, the bottom wall of the 6th groove and the bottom of the 5th groove
Wall connection, the side wall of the 6th groove are connected to the liquid groove out.
Optionally, the damper further include: the 7th groove, the 8th groove, the 9th groove, the tenth groove；
7th groove is set in second plate face, the side wall of the 7th groove and the side of the 6th groove
Wall connection；
8th groove, the 9th groove are set in first plate face, the bottom wall of the 8th groove and institute
The bottom wall connection of the 7th groove is stated, the side wall of the 9th groove is connected to the side wall of the 8th groove；
Tenth groove is set in second plate face, the bottom wall of the tenth groove and the bottom of the 9th groove
Wall connection, the side wall of the tenth groove are connected to the side wall of the liquid groove out.
Optionally, the depth of each groove is identical.
Optionally, the cross section of each groove is circle, and the plate face of the plate structure is circle, and the feed liquor is recessed
The center of the cross section of slot, center, the center of the plate face of the plate structure of the cross section of liquid groove out are conllinear.
Optionally, the diameter of each groove is equal.
Optionally, projection of the groove of every two bottom wall connection in first plate face is overlapped.
Optionally, the bottom wall of the groove of every two bottom wall connection is connected to by through-hole.
Second aspect, the embodiment of the invention also provides a kind of hydraulic damping device assembly, the component includes: that inlet tube connects
Head, shell, liquid back pipe connector, the described in any item hydraulic dampers of first aspect；
The feed liquor pipe fitting, the liquid outlet joint, the hydraulic damper are sheathed in the shell；
The liquid outlet of the feed liquor pipe fitting and the feed liquor groove of the hydraulic damper are opposite, the liquid outlet joint
Liquid inlet is opposite with the liquid groove out of the hydraulic damper.
Hydraulic damper provided in an embodiment of the present invention, comprising: plate structure is provided in the first plate face of plate structure
Feed liquor groove, the first groove are provided with out liquid groove in the second plate face of plate structure, after liquid is flowed into from feed liquor groove,
Since the side wall of feed liquor groove is connected to the side wall of the first groove, liquid can flow into the first groove from feed liquor groove, and by
It is connected in liquid groove out with the bottom wall of the first groove, after liquid flows into the first groove, it is recessed liquid can be flowed into out again from the first groove
In slot, and flowed out from liquid groove out.It, can be first from plate structure when liquid flows through hydraulic damper provided in an embodiment of the present invention
Feed liquor groove in first plate face flows in the first groove in the first plate face, then the liquid out of the second plate face is flowed to from the first groove
In groove, each groove is equivalent to the damping hole of damper, increases by the quantity of damping hole in this way to increase damping
The damping of device, without reducing damper blocking for the smaller damping to increase damper of the through-hole diameter setting of damper
The phenomenon that, to reduce the probability that damper breaks down, and each damping hole is arranged on a plate structure, makes to hinder
The volume of Buddhist nun's device is smaller, easier to process.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of hydraulic damper provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of hydraulic damping device assembly provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The phenomenon that in order to reduce damper blocking, the embodiment of the invention provides a kind of hydraulic damper and hydraulic dampers
Component, by being arranged feed liquor groove, the first groove in the first plate face of the plate structure in hydraulic damper, the of plate structure
Liquid groove is provided in two plate faces, and the side wall of feed liquor groove is connected to the side wall of the first groove, out liquid groove and first recessed
The bottom wall of slot is connected to, can be first from the first plate of plate structure when liquid flows through hydraulic damper provided in an embodiment of the present invention
Feed liquor groove on face flows in the first groove in the first plate face, then the liquid groove out of the second plate face is flowed to from the first groove
Interior, the damping hole of each groove, that is, damper can thus increase the quantity of damping hole, thus increase the damping of damper,
Therefore, just reduce damper blocking without the smaller damping to increase damper that the through-hole diameter of damper is arranged
Phenomenon, to reduce the probability that damper breaks down.
Hydraulic damper is provided for the embodiments of the invention first below to be introduced.
It should be noted that hydraulic damper provided by the embodiment of the present invention can be applied to aerospace, automobile, steel
In the fields such as iron, building, power generation.
As shown in Figure 1, hydraulic damper provided by the embodiment of the present invention include: plate structure 110, feed liquor groove 120,
First groove 130 goes out liquid groove 140；Feed liquor groove 120, the first groove 130 are all set in the first plate face of plate structure 110
On 111, the side wall of feed liquor groove 120 is connected to the side wall of the first groove 130；Liquid groove 140 is set to plate structure 110 out
112 in second plate face, liquid groove 140 is connected to the bottom wall of the first groove 130 out.
In embodiments of the present invention, plate structure 110 include 112 two plate faces of the first plate face 111 and the second plate face, first
Plate face 111 and the second plate face 112 are opposite, i.e. the first plate face 111 and the second plate face 112 are that two of plate structure 110 are opposite
Face.Feed liquor groove 120, the first groove 130 are all set in the first plate face 111, and liquid groove 140 is set in the second plate face out
112, i.e. feed liquor groove 120, the first groove 130 are offered in the first plate face 111, offer out liquid groove in the second plate face 112
140.In Fig. 1, liquid groove 140 is the slot identified at 140 signified dotted lines out.
In embodiments of the present invention, the cross section of above-mentioned each groove can be round, ellipse, square or other
Shape, the embodiment of the present invention do not limit specifically, in order to make the more reasonable structure of damper, and the cloth to damper structure of being more convenient for
Office and processing, in one embodiment, the cross section of above-mentioned each groove can be circle.What is be arranged in same plate face is each
The depth of a groove can be equal, can not also wait, and the depth for each groove being arranged in different plate faces can be equal, can also be with
It differs, is the more reasonable structure for further making damper, the depth of the production and processing for damper of being more convenient for, each groove can phase
Deng.
The shape and size of the shape and size of the cross section of above-mentioned feed liquor groove 120, the out cross section of liquid groove 140 can
To be determined according to the mounting location of damper, for example, the feed liquor groove 120 of damper connects when damper is installed in the duct
Feed liquor nozzle, go out liquid groove 140 connect outlet tube mouth when, shape, the size of the cross section of feed liquor groove 120 can be with inlet tubes
Shape, the size of the cross section of mouth are adapted, and the shape, size of the cross section of liquid groove 140 can be with the cross of outlet tube mouth out
Shape, the size in section are adapted.
In embodiments of the present invention, any recessed in the depth with the second plate face 112 of any groove in the first plate face 111
The depth of slot and respectively less than plate structure 110 thickness, the thickness of plate structure 110 i.e. the first plate face 111 and the second plate face
The distance between 112；The side wall of any two groove in the same plate face of plate structure 110 is non-intersecting, i.e. the first plate face 111
On any two groove side wall it is non-intersecting, the side wall of any two groove in the second plate face 112 is non-intersecting.
As shown in Figure 1, the side wall of feed liquor groove 120 can by the channel groove 150 that is provided in the first plate face 111 with
The side wall of first groove 130 is connected to, and liquid can flow into the first groove by channel groove 150 after the inflow of feed liquor groove 120
It is interior.
In embodiments of the present invention, 140 side wall of liquid groove or bottom wall can be connected to the bottom wall of the first groove 130 out, from
And it realizes out liquid groove 140 and the bottom wall of the first groove and is connected to；For example, the bottom wall of liquid groove 140 can be by being arranged in plate out
Hole in shape structure 110 is connected to the bottom wall of the first groove 130, and the side wall of liquid groove 140 can be by being arranged in plate knot out
Poroid channel in structure 110 is connected to the bottom wall of the first groove 130, and those skilled in the art can also be realized by other structures
Liquid groove 140 is connected to the bottom wall of the first groove out, and the embodiment of the present invention does not limit specifically.
Hydraulic damper provided in an embodiment of the present invention, after liquid is flowed into from feed liquor groove 120, due to feed liquor groove
120 side wall is connected to the side wall of the first groove 130, and liquid can flow into the first groove 130 from feed liquor groove 120, and by
It is connected in liquid groove 140 out with the bottom wall of the first groove 130, it, can be from the first groove 130 after liquid flows into the first groove 130
It flows into out in liquid groove 140, and is flowed out from liquid groove 140 out again.Liquid flows through hydraulic damper provided in an embodiment of the present invention
When, the first groove in the first plate face 111 can be first flowed to from the feed liquor groove 120 in the first plate face 111 of plate structure 110
In 130, then out of, the first groove 130 flows to the second plate face 112 liquid groove 140 out, each groove is equivalent to the resistance of damper
Buddhist nun hole, increases by the quantity of damping hole in this way to increase the damping of damper, without by the through-hole diameter of damper
The smaller damping to increase damper being arranged reduces the phenomenon that damper blocks, breaks down to reduce damper
Probability, and each damping hole is arranged on a plate structure, keeps the volume of damper smaller, easier to process.
In one embodiment, as shown in Figure 1, damper can also include: the second groove 160, the second groove 160 is set
It is placed in the second plate face 112, the bottom wall of the second groove 160 is connected to the bottom wall of the first groove 130, the side wall of the second groove 160
It is connected to liquid groove 140 out.
In the present embodiment, the first groove 130 is connected to by the second groove 160 with liquid groove 140 out, and liquid is flowing into
After first groove 130, then from the first groove 130 the second groove 160 of inflow, liquid groove then is flowed into out from the second groove 160 again
140, in this way, just further increasing the circulation path of liquid, keep the damping of damper bigger.
In one embodiment, as shown in Figure 1, damper can also include: third groove 170, the 4th groove 180,
5th groove 190, the 6th groove 1100；Third groove 170 is set in the second plate face 112, the side wall of third groove 170 and
The side wall of two grooves 160 is connected to；4th groove 180, the 5th groove 190 are set in the first plate face 111, the 4th groove 180
Bottom wall is connected to the bottom wall of third groove 170, and the side wall of the 4th groove 180 is connected to the side wall of the 5th groove 190；6th groove
1100 are set in the second plate face 112, and the bottom wall of the 6th groove 1100 is connected to the bottom wall of the 5th groove 190, the 6th groove
1100 side wall is connected to liquid groove out.
It, can after present embodiment is additionally arranged third groove 170, the 4th groove 180, the 5th groove 190, the 6th groove 1100
So that the first groove 130 passes through the second groove 160, third groove 170, the 4th groove 180, the 5th groove 190, the 6th groove
1100 are connected to liquid groove 140 out, and liquid is after flowing into the first groove 130, then followed by the second groove 160, third groove
170, then the 4th groove 180, the 5th groove 190, the 6th groove 1100 flow into out liquid groove 140 from the 6th groove 1100 again,
To further increase the circulation path of liquid, keep the damping of damper bigger.
In one embodiment, as shown in Figure 1, damper can also include: the 7th groove 1110, the 8th groove
1120, the 9th groove 1130, the tenth groove 1140；7th groove 1110 is set in the second plate face 112, the 7th groove 1110
Side wall is connected to the side wall of the 6th groove 1100；8th groove 1120, the 9th groove 1130 are set in the first plate face 111, the
The bottom wall of eight grooves 1120 is connected to the bottom wall of the 7th groove 1110, the side wall of the 9th groove 1130 and the side of the 8th groove 1120
Wall connection；Tenth groove 1140 is set in the second plate face 112, the bottom wall of the tenth groove 1140 and the bottom wall of the 9th groove 1130
Connection, the side wall of the tenth groove 1140 are connected to the side wall of liquid groove 140 out.In Fig. 1, the tenth groove 1140 is 1140 institutes of mark
Slot at the dotted line of finger.
Present embodiment is additionally arranged the 7th groove 1110, the 8th groove 1120, the 9th groove 1130, the tenth groove 1140
Afterwards, the first groove 130 can be made to pass through the second groove 160, third groove 170, the 4th groove 180, the 5th groove the 190, the 6th
Groove 1100, the 7th groove 1110, the 8th groove 1120, the 9th groove 1130, the tenth groove 1140 connect with liquid groove 140 out
Logical, liquid is after flowing into the first groove 130, then followed by the second groove 160, third groove 170, the 4th groove the 180, the 5th
Groove 190, the 6th groove 1100, the 7th groove 1110, the 8th groove 1120, the 9th groove 1130, the tenth groove 1140, then
Liquid groove 140 is flowed into out from the tenth groove 1140 again, to further increase the circulation path of liquid, makes the damping of damper
It is bigger.
In one embodiment, the depth of each above-mentioned groove can be identical, so that the more reasonable structure of damper,
And the production and processing for damper of being more convenient for.
In one embodiment, the cross section of each above-mentioned groove can be circle, since circular configuration is more convenient for adding
Work, and mobility of the liquid in the groove of circular cross-section is more preferable, and therefore, the cross section of each above-mentioned groove is provided in round,
Mobility is more preferable when liquid can be made to pass through damper, while making the more reasonable structure of damper and damper production of being more convenient for
Processing.In one embodiment, the plate face of plate structure 110 may be circle, in this way, being applicable in for damper can be improved
Range keeps the availability of damper, interchangeability more preferable.
In one embodiment, the center of the cross section of feed liquor groove 120, go out liquid groove 140 cross section center,
It the center of the plate face of plate structure 110 can be conllinear.In this way, can be further improved the scope of application of damper, make damper
Availability it is stronger.
For the more reasonable structure for further making damper, the production and processing for damper of being more convenient for, in one embodiment,
The diameter of each above-mentioned groove can be equal.
In one embodiment, projection of the above-mentioned groove of every two bottom wall connection in the first plate face 111 is overlapped.Two
The above-mentioned groove of a bottom wall connection, that is, be separately positioned on the first plate face 111 and in the second plate face 112, bottom wall is connected to two
Groove.When projection of the above-mentioned groove of every two bottom wall connection in the first plate face 111 is overlapped, two bottom wall connections of being more convenient for
Groove bottom wall between connection, for example, can be connected to by through-hole between the bottom wall of the groove of two bottom walls connection, this is logical
The axis in hole can be perpendicular to the first plate face 111, by the way that axis is arranged on plate structure 110 perpendicular to the first plate face 111
Through-hole, the bottom wall of Lai Liantong the first plate face 111 and two grooves in the second plate face 112, the processing for damper of being more convenient for.
As shown in Fig. 2, the embodiment of the invention also provides a kind of hydraulic damping device assembly, which includes: claim 1
To 8 described in any item hydraulic dampers 100, feed liquor pipe fitting 200, shell 300, liquid outlet joint 400；Feed liquor pipe fitting
200, liquid back pipe connector 400, hydraulic damper 100 are sheathed in shell 300；The liquid outlet of feed liquor pipe fitting 200 with it is hydraulic
The feed liquor groove 120 of damper 100 is opposite, the liquid inlet of liquid back pipe connector 400 and the liquid groove 140 out of hydraulic damper 100
Relatively.
Hydraulic damping device assembly provided in an embodiment of the present invention at work, liquid outlet of the liquid from feed liquor pipe fitting 200
After outflow, the feed liquor groove 120 of hydraulic damper 100 can be flowed into, then flow out from the liquid groove 140 that goes out of hydraulic damper 100, so
The liquid inlet for flowing into liquid back pipe connector 400 again afterwards is flowed out from the liquid outlet of liquid back pipe connector 400.
It, can be by lengthening liquid when liquid flows through the hydraulic damper of hydraulic damping device assembly provided in an embodiment of the present invention
The circulation path of body increases the damping of damper, it is not necessary that the smaller of the through-hole diameter setting of damper is increased damper
Damping reduces the phenomenon that damper blocks, to reduce the probability that damper breaks down.
In one embodiment, hydraulic damping device assembly can also include: filter structure 500, and each filter structure 500 is
Be sheathed in shell 300, and between feed liquor pipe fitting 200 and hydraulic damper 100, hydraulic damper 100 connects with liquid back pipe
Filter structure 500 is provided between first 400.After filter structure 500 is set, it is possible to reduce liquid in feed liquor pipe fitting 200
The pollutant of liquid enters hydraulic damper 100 in pollutant, liquid back pipe connector 400, to be further reduced hydraulic damper
Clogging keeps the failure rate of hydraulic damper lower.
In one embodiment, when shell 300 is splicing shell, sealing ring is can be set in the stitching portion of shell 300
600, to reduce fluid seepage.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for component reality
For applying example, since it is substantially similar to damper embodiment, so being described relatively simple, related place is referring to damper reality
Apply the part explanation of example.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of hydraulic damper, which is characterized in that the damper includes: plate structure, feed liquor groove, the first groove, goes out
Liquid groove；
The feed liquor groove, first groove are all set in the first plate face of the plate structure, the feed liquor groove
Side wall is connected to the side wall of first groove；
The liquid groove out is set in the second plate face of the plate structure, the bottom of the liquid groove and first groove out
Wall connection.
2. damper according to claim 1, which is characterized in that the damper further include: the second groove；
Second groove is set in second plate face, and the bottom wall of the bottom wall of second groove and first groove connects
It is logical；
The side wall of second groove is connected to the liquid groove out.
3. damper according to claim 2, which is characterized in that the damper further include: third groove, the 4th recessed
Slot, the 5th groove, the 6th groove；
The third groove is set in second plate face, and the side wall of the side wall of the third groove and second groove connects
It is logical；
4th groove, the 5th groove are set in first plate face, the bottom wall of the 4th groove and described the
The bottom wall of three grooves is connected to, and the side wall of the 4th groove is connected to the side wall of the 5th groove；
6th groove is set in second plate face, and the bottom wall of the 6th groove and the bottom wall of the 5th groove connect
Logical, the side wall of the 6th groove is connected to the liquid groove out.
4. damper according to claim 3, which is characterized in that the damper further include: the 7th groove, the 8th recessed
Slot, the 9th groove, the tenth groove；
7th groove is set in second plate face, and the side wall of the 7th groove and the side wall of the 6th groove connect
It is logical；
8th groove, the 9th groove are set in first plate face, the bottom wall of the 8th groove and described the
The bottom wall of seven grooves is connected to, and the side wall of the 9th groove is connected to the side wall of the 8th groove；
Tenth groove is set in second plate face, and the bottom wall of the tenth groove and the bottom wall of the 9th groove connect
Logical, the side wall of the tenth groove is connected to the side wall of the liquid groove out.
5. damper according to any one of claims 1 to 4, which is characterized in that the depth of each groove is identical.
6. damper according to any one of claims 1 to 4, which is characterized in that the cross section of each groove is circle
Shape, the plate face of the plate structure be circle, the center of the cross section of the feed liquor groove, it is described go out liquid groove cross section
Center, the plate structure plate face center it is conllinear.
7. damper according to claim 6, which is characterized in that the diameter of each groove is equal.
8. damper according to claim 4, which is characterized in that the groove of every two bottom wall connection is described first
Projection in plate face is overlapped.
9. damper according to claim 4, which is characterized in that the bottom wall of the groove of every two bottom wall connection passes through
Through-hole connection.
10. a kind of hydraulic damping device assembly, which is characterized in that the component include: feed liquor pipe fitting, shell, liquid back pipe connector,
The described in any item hydraulic dampers of claim 1 to 9；
The feed liquor pipe fitting, the liquid outlet joint, the hydraulic damper are sheathed in the shell；
The liquid outlet of the feed liquor pipe fitting and the feed liquor groove of the hydraulic damper are opposite, and the liquid outlet joint enters liquid
Mouth is opposite with the liquid groove out of the hydraulic damper.
Priority Applications (1)
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| CN201910217381.1A CN109899617B (en) | 2019-03-21 | 2019-03-21 | Hydraulic damper and hydraulic damper assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217381.1A CN109899617B (en) | 2019-03-21 | 2019-03-21 | Hydraulic damper and hydraulic damper assembly |
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| CN109899617B CN109899617B (en) | 2021-04-16 |
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