CN110005753A - A kind of rotary damper - Google Patents
A kind of rotary damper Download PDFInfo
- Publication number
- CN110005753A CN110005753A CN201910294439.2A CN201910294439A CN110005753A CN 110005753 A CN110005753 A CN 110005753A CN 201910294439 A CN201910294439 A CN 201910294439A CN 110005753 A CN110005753 A CN 110005753A
- Authority
- CN
- China
- Prior art keywords
- piston
- chamber
- shaft
- receiving unit
- rotary damper
- Prior art date
- 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.)
- Pending
Links
- 238000013016 damping Methods 0.000 claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 5
- 210000004907 gland Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
- F16F15/161—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material characterised by the fluid damping devices, e.g. passages, orifices
Abstract
The invention discloses a kind of rotary damper, including shell, shaft, piston, the first end of shell is equipped with bottom, and second end is equipped with opening portion；Shaft is circumferentially rotatably installed on the position in the shell close to the second end, and stretches out the opening portion；Piston circumferentially limit, the axially movable position being installed in the shell close to the first end, and the inner space of the shell is separated into the first chamber and second chamber being axially arranged；Wherein, the shaft and the piston are linked, when the shaft rotates, the piston is driven to move axially, so that the alternative one of the first chamber and the second chamber forms low pressure oil pocket, another formation high-voltage oil cavity of the two is slowly penetrated into the low pressure oil pocket from the high-voltage oil cavity by damping oil and forms damping and matched with piston using shaft and formed, processing technology is more simplified, reduces processing cost.
Description
Technical field
The present invention relates to a kind of rotary dampers.
Background technique
As the improvement of people's living standards, damping mechanism has protecting against shock, low due to that can buffer in daily life
The characteristics of noise, thus be widely used, such as on pan closet lid, on door leaf.Damping mechanism on existing market is mostly logical
Hydraulic realization damping function is crossed, i.e., forms high-voltage oil cavity and low pressure oil pocket in opening procedure in damper, it is slow by damping oil
Slowly low pressure oil pocket is penetrated into from high-voltage oil cavity, to achieve the purpose that fall slowly mute.
The shaft that traditional damper generally includes the shell of a fillable damping oil and one is rotatably assorted with housing seal,
It is bonded with inner walls and oil baffle that flexible dynamic damping oil stream is dynamic in shaft at least provided with one, at least provided with one in inner walls
The boss of oil baffle rotation amplitude can be limited, to be hinged on boss being stirred or can be by damping oil and shaft axial plane by damping oil
The plectrum stirred jointly；Plectrum is equipped with the mating surface that linkage is contradicted with shaft axial plane, sets between mating surface and shaft axial plane
There is the oil passage for changing damping oil liquid resistance by plectrum rotation.When shaft rotates in one direction, plectrum leads to damping oil
Road closing, form cover board falls effect slowly, and when shaft rotates to another way, plectrum is not by damping oil channel enclosed, shape
Effect is fallen fastly at cover board.But the processing technology of above-mentioned conventional damper is more complicated, required precision is higher.
Summary of the invention
The present invention is used shaft to match with piston and carrys out shape to solve the above problems, provide a kind of rotary damper
At processing technology is more simplified, reduces processing cost.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of rotary damper comprising:
Shell (10), first end are equipped with bottom (111), and second end is equipped with opening portion (121)；
Shaft (20), the circumferential position being rotatably installed in the shell (10) close to the second end, and stretch
The opening portion (121) out；
Piston (30), circumferential limit axially movable are installed in the shell (10) close to the first end
Position, and the inner space of the shell (10) is separated into the first chamber (11) and second chamber (12) being axially arranged；
Wherein, the shaft (20) and the piston (30) are linked, and when the shaft (20) rotates, drive the work
(30) axial movement is filled in, so that the alternative one of the first chamber (11) and the second chamber (12) forms low pressure oil
Chamber, another formation high-voltage oil cavity of the two slowly penetrate into the low pressure oil pocket from the high-voltage oil cavity by damping oil and are formed
Damping.
Preferably, it is respectively equipped with and to be linked on the surface of the shaft (20) and the opposite side of the piston (30)
First receiving unit (21) and the first auxiliary section (31), when the shaft (20) is rotated towards the first circumferential direction, described first
Receiving unit (21) and the first auxiliary section (31) connect under cooperation, and the piston (30) is driven to transport along first axial direction
It is dynamic；The second receiving unit being linked is further respectively had on the surface of the shaft (20) and the opposite side of the piston (30)
(22) and the second auxiliary section (32), when the shaft (20) is rotated towards the second circumferential direction, in second receiving unit (22)
With connecting under cooperation for the second auxiliary section (32), the piston (30) is driven to move along the second axial direction.
Further, first auxiliary section (31) and second auxiliary section (32) are staggered radially or in circumferential direction
Setting, corresponding, first receiving unit (21) and second receiving unit (22) are staggered setting radially or in circumferential direction；
Either, second auxiliary section (32) is arranged on first auxiliary section (31), corresponding, second receiving unit (22)
It is arranged on first receiving unit (21).
Further, first receiving unit (21) and first auxiliary section (31) are respectively equipped with the curvature of space
Cam curved surface.
Further, the alternative one of second receiving unit (22) and second auxiliary section (32), which is equipped with, has space
The cam track of curvature, another grooved tracks being equipped with the curvature of space of the two, either, second receiving unit (21)
Helicitic texture is formed between second auxiliary section (32).
It preferably, further include the oil passage (40) for being connected to the first chamber (11) and the second chamber (12), institute
Oil passage (40) is stated to be set on the shaft (20) or be arranged on the piston (30) or be arranged in the shaft
(20) between the piston (30).
Further, it is additionally provided with unidirectional adjustment sheet (33) on the piston (30), the unidirectional adjustment sheet (33) is located at institute
It states between first chamber (11) and the second chamber (12), the piston (30) is along first axial direction motion process, institute
It states unidirectional adjustment sheet (33) and closes the oil passage (40)；The piston (30) is along the second axial direction motion process, institute
It states unidirectional adjustment sheet (33) and opens the oil passage (40).
Further, the piston (30), which is equipped with, is connected to letting out for the first chamber (11) and the second chamber (12)
Discharge orifice (34), the shaft (20) are equipped with the extension (23) plugged with the discharge orifice (34), the extension (23)
Outer wall and the discharge orifice (34) inner wall between gap form the oil passage (40).
It preferably, further include being connected to the adjusting cavity (13) of the first chamber (11) and the second chamber (12) and being used for
Adjust the adjusting screw (131) of the size of the adjusting cavity (13), it is described adjust screw (131) it is axially movable be installed on institute
It states the outer end of adjusting cavity (13) and is sealed with the adjusting cavity (13) and cooperated.
Preferably, the middle part of the outer peripheral surface of the piston (30) is equipped with piston seal (36), passes through the piston seal
It encloses (36) and the inner space of the shell (10) is separated into first chamber (11) and second chamber (12).
The beneficial effects of the present invention are:
(1), the present invention is matched using shaft with piston to be formed, and processing technology is more simplified, reduces processing cost；
(2), the inner space of shell is separated into axially disposed high-voltage oil cavity and low pressure oil by piston by the present invention
Chamber, so that slowly penetrating into the low pressure oil pocket from the high-voltage oil cavity by damping oil forms damping, structure is simple, function
It can be reliable；
(3), the present invention realizes piston along the fortune of first axial direction by the cooperation of the first auxiliary section and the first receiving unit
It is dynamic, and piston is realized along the movement of the second axial direction by the cooperation of the second auxiliary section and the second receiving unit, function is more reliable；
(4), the first auxiliary section of the invention and the first receiving unit have the curvature of space, keep its movement more smooth；
(5), only control, structure letter need to be opened and closed to oil passage in the unidirectional adjustment sheet of one end of piston setting in the present invention
It is single reliable.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of decomposition texture schematic diagram of rotary damper of the present invention；
Fig. 2 is that (unidirectional adjustment sheet closes oil passage to a kind of one of schematic cross-sectional view of rotary damper of the present invention
State)；
Fig. 3 is a kind of two (unidirectional adjustment sheet opening oil passages of schematic cross-sectional view of rotary damper of the present invention
State)；
Fig. 4 is a kind of piston structure schematic diagram of rotary damper of the present invention；
Fig. 5 is a kind of pivot structure schematic diagram of rotary damper of the present invention；
In figure:
10- shell；11- first chamber；The bottom 111-；12- second chamber；121- opening；13- adjusting cavity；
131- adjusts screw；
20- shaft；The first receiving unit of 21-；The second receiving unit of 22-；23- extension；
30- piston；The first auxiliary section 31-；The second auxiliary section 32--；The unidirectional adjustment sheet of 33-；34- discharge orifice；35- guiding
Groove；36- piston seal；361- sealing ring mounting groove；
40- oil passage；
50- gland；51- gland ring.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in Figures 1 to 5, a kind of rotary damper of the invention comprising:
Shell 10, first end are equipped with bottom 111, and second end is equipped with opening portion 121；
Shaft 20, the circumferential position being rotatably installed in the shell 10 close to the second end, and stretch out institute
State opening portion 121；
Piston 30, circumferential limit, the axially movable position being installed in the shell 10 close to the first end,
And the inner space of the shell 10 is separated into the first chamber 11 and second chamber 12 being axially arranged；
Wherein, the shaft 20 and the piston 30 are linked, and when the shaft 20 rotates, drive 30 axis of piston
To movement, so that the alternative one of the first chamber 11 and the second chamber 12 forms low pressure oil pocket, the two is another
One forms high-voltage oil cavity, slowly penetrates into the low pressure oil pocket from the high-voltage oil cavity by damping oil and forms damping.
Shell 10:
The shell 10 has internal cavities, and the first end of cavity is equipped with the bottom 111, which uses and institute
The integrated molding of shell 10 is stated, can also be cooperatively connected using dismountable sealing；The second end of cavity is equipped with the opening portion
121, which is connected with the cavity, further includes a gland 50, the opening portion of the gland 50 and the shell 10
121 are tightly connected.
Shaft 20:
As shown in Figure 1 and Figure 5, in the present embodiment, the shaft 20 successively includes: the extension 23 of inner end along axial direction,
The rotation section at middle part and receiving unit 21,22, (such as circumferentially limit connects the interconnecting piece of outer end with the rear end sets of holes of closet cover board
Connect), in the present embodiment, the outer end of the shaft 20 uses polygon cylinder, and middle part uses near cylindrical structure, inner end
Extension 23 also use cylindrical structure；Middle part and the inner wall of the shell 10 are rotatably assorted, extension 23 with 30 turns of piston
Dynamic cooperation.
Piston 30:
As shown in Figure 1 and Figure 4, in the present embodiment, the middle part of the outer peripheral surface of the piston 30 is equipped with piston seal 36, should
Piston seal 36 is installed in the sealing ring mounting groove 361 of the outer peripheral surface of the piston 30 and close with the inner wall of the shell 10
Envelope cooperation, is separated into first chamber 11 and second chamber for the inner space of the shell 10 by the piston seal 36
12.That is, the first chamber 11 and the second chamber 12 are separated by piston seal 36.Also, the piston 30
Outer wall and the shell 10 inner wall alternative one be equipped with guiding groove 35, the two it is another be equipped with guiding fin (do not scheme
Show), circumferential limit is carried out to the piston 30 by the cooperation of the guiding groove 35 and the guiding fin.
The matching relationship of piston 30 and shaft 20:
As shown in Figure 4 and Figure 5, the shaft 20 and the piston 30 are respectively equipped with linkage along the surface of opposite side
Also divide on the surface of first receiving unit 21 of cooperation and the first auxiliary section 31, the shaft 20 and the opposite side of the piston 30
The second receiving unit 22 that She You be linked and the second auxiliary section 32.In the present embodiment, first receiving unit 21 and described
First auxiliary section 31 is respectively equipped with the cam curved surface with the curvature of space；Second receiving unit 22 and second auxiliary section 32
Alternative one be equipped with the curvature of space cam track, the two it is another be equipped with the curvature of space grooved tracks.
In other embodiments, helicitic texture is formed between second receiving unit 22 and second auxiliary section 32.
It when the shaft 20 is rotated towards the first circumferential direction, such as rotates forward and (rotates clockwise), described first
Receiving unit 21 and first auxiliary section 31 connect under cooperation, drive the piston 30 move along first axial direction (such as
Axially outward movement)；It when the shaft 20 is rotated towards the second circumferential direction, such as rotates backward and (rotates counterclockwise), in institute
Connecting under cooperation for the second receiving unit 22 and second auxiliary section 32 is stated, the piston 30 is driven to move along the second axial direction
(such as axially inward movement).
In the present embodiment, first auxiliary section 31 and second auxiliary section 32 are staggered radially or in circumferential direction and set
It sets, corresponding, first receiving unit 21 and second receiving unit 22 are staggered setting radially or in circumferential direction；Or
It can be, second auxiliary section 32 is arranged on first auxiliary section 31, and corresponding, the setting of the second receiving unit 22 exists
On first receiving unit 21.
It as shown in Figures 2 and 3, further include the oil passage 40 for being connected to the first chamber 11 and the second chamber 12,
The oil passage 40 be set in the shaft 20 or be arranged on the piston 30 or be arranged the shaft 20 with
Between the piston 30.Also, unidirectional adjustment sheet 33 is additionally provided on the piston 30, the unidirectional adjustment sheet 33 is located at described the
Between one chamber 11 and the second chamber 12, the piston 30 is along first axial direction motion process, the unidirectional adjusting
Piece 33 closes the oil passage 40；The piston 30 along the second axial direction motion process, beat by the unidirectional adjustment sheet 33
Open the oil passage 40.
In the present embodiment, the piston 30 is equipped with the discharge orifice for being connected to the first chamber 11 and the second chamber 12
34, the shaft 20 is equipped with the extension 23 that plugs with the discharge orifice 34, the outer wall of the extension 23 and described lets out
Gap between the inner wall of discharge orifice 34 forms the oil passage 40.
In addition, further including being connected to the adjusting cavity 13 of the first chamber 11 and the second chamber 12 and described for adjusting
The adjusting screw 131 of the size of adjusting cavity 13, it is described adjust screw 131 it is axially movable be installed on the outer of the adjusting cavity 13
End simultaneously seals cooperation with the adjusting cavity 13.In the present embodiment, the shaft 20 is arranged in adjusting screw 131 insertion
Outer end (one end for stretching out the opening portion 121 of the shell 10).
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not office
Be limited to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification and
Environment, and can be changed within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledge
It is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present invention
In scope of protection of the claims.
Claims (10)
1. a kind of rotary damper characterized by comprising
Shell (10), first end are equipped with bottom (111), and second end is equipped with opening portion (121)；
Shaft (20), the circumferential position being rotatably installed in the shell (10) close to the second end, and stretch out institute
State opening portion (121)；
Piston (30), circumferential limit, the axially movable position being installed in the shell (10) close to the first end,
And the inner space of the shell (10) is separated into the first chamber (11) and second chamber (12) being axially arranged；
Wherein, the shaft (20) and the piston (30) are linked, and when the shaft (20) rotates, drive the piston
(30) it moves axially, so that the alternative one of the first chamber (11) and the second chamber (12) forms low pressure oil
Chamber, another formation high-voltage oil cavity of the two slowly penetrate into the low pressure oil pocket from the high-voltage oil cavity by damping oil and are formed
Damping.
2. a kind of rotary damper according to claim 1, it is characterised in that: the shaft (20) and the piston (30)
The first receiving unit (21) being linked and the first auxiliary section (31) are respectively equipped on the surface of opposite side, when the shaft
(20) when being rotated towards the first circumferential direction, in the cooperation that connects of first receiving unit (21) and first auxiliary section (31)
Under, drive the piston (30) to move along first axial direction；The shaft (20) and the opposite side of the piston (30)
The second receiving unit (22) being linked and the second auxiliary section (32) are further respectively had on surface, when the shaft (20) is towards second
When circumferential direction rotates, under the cooperation that connects of second receiving unit (22) and second auxiliary section (32), described in drive
Piston (30) is moved along the second axial direction.
3. a kind of rotary damper according to claim 2, it is characterised in that: first auxiliary section (31) and described
Two auxiliary sections (32) are staggered setting radially or in circumferential direction, and corresponding, first receiving unit (21) and described second connects
Receipts portion (22) is staggered setting radially or in circumferential direction；Either, the second auxiliary section (32) setting is matched described first
Corresponding in conjunction portion (31), second receiving unit (22) is arranged on first receiving unit (21).
4. a kind of rotary damper according to claim 2, it is characterised in that: first receiving unit (21) and described
One auxiliary section (31) is respectively equipped with the cam curved surface with the curvature of space.
5. a kind of rotary damper according to claim 2, it is characterised in that: second receiving unit (22) and described
The alternative one of two auxiliary sections (32) is equipped with the cam track with the curvature of space, and the another of the two is equipped with the curvature of space
Grooved tracks either form helicitic texture between second receiving unit (21) and second auxiliary section (32).
6. a kind of rotary damper according to claim 1, it is characterised in that: further include being connected to the first chamber (11)
With the oil passage (40) of the second chamber (12), the oil passage (40) is set on the shaft (20) or is arranged
On the piston (30) or it is arranged between the shaft (20) and the piston (30).
7. a kind of rotary damper according to claim 6, it is characterised in that: be additionally provided with unidirectional tune on the piston (30)
Nodal plate (33), the unidirectional adjustment sheet (33) is between the first chamber (11) and the second chamber (12), the work
(30) are filled in along first axial direction motion process, and the unidirectional adjustment sheet (33) closes the oil passage (40)；The work
(30) are filled in along the second axial direction motion process, and the unidirectional adjustment sheet (33) opens the oil passage (40).
8. a kind of rotary damper according to claim 6 or 7, it is characterised in that: the piston (30) is equipped with connection
The discharge orifice (34) of the first chamber (11) and the second chamber (12), the shaft (20) are equipped with and the discharge orifice
(34) extension (23) plugged, the gap shape between the outer wall of the extension (23) and the inner wall of the discharge orifice (34)
At the oil passage (40).
9. a kind of rotary damper according to claim 1, it is characterised in that: further include being connected to the first chamber (11)
The adjusting screw (131) of size with the adjusting cavity (13) of the second chamber (12) and for adjusting the adjusting cavity (13),
The axially movable outer end for being installed on the adjusting cavity (13) of adjusting screw (131) is simultaneously close with the adjusting cavity (13)
Envelope cooperation.
10. a kind of rotary damper according to claim 1, it is characterised in that: in the outer peripheral surface of the piston (30)
Portion is equipped with piston seal (36), and the inner space of the shell (10) is separated into first by the piston seal (36)
Chamber (11) and second chamber (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910294439.2A CN110005753A (en) | 2019-04-12 | 2019-04-12 | A kind of rotary damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910294439.2A CN110005753A (en) | 2019-04-12 | 2019-04-12 | A kind of rotary damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110005753A true CN110005753A (en) | 2019-07-12 |
Family
ID=67171321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910294439.2A Pending CN110005753A (en) | 2019-04-12 | 2019-04-12 | A kind of rotary damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110005753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561538A (en) * | 2020-06-11 | 2020-08-21 | 蔡燕辉 | Rotary damper |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910672A (en) * | 2007-12-26 | 2010-12-08 | 思嘎茨讷工业株式会社 | Rotary damper |
| CN102587778A (en) * | 2012-01-17 | 2012-07-18 | 李飞勇 | Variable resistance damper |
| CN202370351U (en) * | 2011-12-19 | 2012-08-08 | 陈樑 | Descent control device |
| EP2559365A2 (en) * | 2011-08-17 | 2013-02-20 | Xiangji Wang | A damping shaft mechanism |
| CN203584110U (en) * | 2013-11-15 | 2014-05-07 | 彭东 | Damping mechanism |
| CN210196352U (en) * | 2019-04-12 | 2020-03-27 | 厦门瑞尔特卫浴科技股份有限公司 | Rotary damper |
-
2019
- 2019-04-12 CN CN201910294439.2A patent/CN110005753A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910672A (en) * | 2007-12-26 | 2010-12-08 | 思嘎茨讷工业株式会社 | Rotary damper |
| EP2559365A2 (en) * | 2011-08-17 | 2013-02-20 | Xiangji Wang | A damping shaft mechanism |
| CN202370351U (en) * | 2011-12-19 | 2012-08-08 | 陈樑 | Descent control device |
| CN102587778A (en) * | 2012-01-17 | 2012-07-18 | 李飞勇 | Variable resistance damper |
| CN203584110U (en) * | 2013-11-15 | 2014-05-07 | 彭东 | Damping mechanism |
| CN210196352U (en) * | 2019-04-12 | 2020-03-27 | 厦门瑞尔特卫浴科技股份有限公司 | Rotary damper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561538A (en) * | 2020-06-11 | 2020-08-21 | 蔡燕辉 | Rotary damper |
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