CN112356924B - Composite hydraulic damping device and vehicle body suspension - Google Patents
Composite hydraulic damping device and vehicle body suspension Download PDFInfo
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- CN112356924B CN112356924B CN202011158351.7A CN202011158351A CN112356924B CN 112356924 B CN112356924 B CN 112356924B CN 202011158351 A CN202011158351 A CN 202011158351A CN 112356924 B CN112356924 B CN 112356924B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D24/00—Connections between vehicle body and vehicle frame
- B62D24/02—Vehicle body, not intended to move relatively to the vehicle frame, and mounted on vibration absorbing mountings, e.g. rubber pads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
The invention relates to the technical field of automobile device structures, in particular to a composite hydraulic damping device and an automobile body suspension. The hydraulic damping component is connected to the lower end of the elastic damping component; the hydraulic damping component comprises a hollow and closed outer sleeve and a central sleeve penetrating through the outer sleeve; an upper cavity and a lower cavity for containing damping liquid are arranged in the outer sleeve; a flow channel for communicating the upper cavity and the lower cavity is arranged on the pipe body of the central sleeve positioned in the outer sleeve; an elastic device for eliminating the transverse vibration of the central sleeve is arranged between the outer sleeve and the central sleeve; an automobile body suspension inner pipe which is communicated with the central sleeve and is coaxially arranged is arranged on the elastic damping component in a penetrating mode. The damping device has the advantages of simple structure, small occupied space, light weight, convenience in installation and excellent damping effect, can bear loads from all directions on a vehicle body, and has great popularization value.
Description
Technical Field
The invention relates to the technical field of automobile device structures, in particular to a composite hydraulic damping device and an automobile body suspension.
Background
High mobility off-road pick-up vehicles with multi-wheel drive typically employ an off-body type body, and in order to support the body weight and reduce vibration and noise from the chassis suspension system, a resilient rubber suspension is typically provided between the body and the frame. The existing technical scheme of vehicle body suspension is generally optimized on the structural size of an elastic body, and the main aim of realizing the rigidity and the durability of the elastic part is to achieve the rigidity and the durability of the elastic part. The damping of the rubber car body suspension cannot be greatly improved due to the inherent properties of the rubber material. In addition, in the existing engine suspension vibration damping system, although a hydraulic damping type suspension with excellent vibration damping performance is applied, the suspension has small bearing rigidity or is difficult to mount due to special structure, and cannot be directly applied to a vehicle body suspension system.
Patent No. CN101337559B entitled "body mount with inserted damping device for vehicle" describes a damping device for an automobile, which includes an elastic body mount and a hydraulic body mount, and the two body mounts are combined to form a good damping effect. However, in the use process of the vehicle body suspension, not only vertical vibration needs to be buffered, but also transverse vibration needs to be relieved, but the vehicle body suspension introduced by the patent can only perform partial transverse vibration reduction through the elastic vehicle body suspension, the transverse vibration reduction effect of the hydraulic vehicle body suspension is extremely low, so that the transverse vibration reduction effect of the whole vehicle body suspension is extremely poor, the vehicle body suspension is easily damaged by transverse vibration after long-term use, and the service life is seriously influenced.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a composite hydraulic damping device and a vehicle body suspension.
The technical scheme of the invention is as follows: a compound hydraulic damping device, includes elastic damping subassembly its characterized in that: the hydraulic damping component is connected to the lower end of the elastic damping component; the hydraulic damping component comprises a hollow and closed outer sleeve and a central sleeve penetrating through the outer sleeve; an upper cavity and a lower cavity which contain damping fluid and have variable cavity volumes are arranged in the outer sleeve; the central sleeve penetrates through the upper cavity and the lower cavity, and a flow passage for communicating the upper cavity with the lower cavity when the volumes of the upper cavity and the lower cavity are changed due to tension or compression is arranged on the central sleeve; an elastic device for eliminating the transverse vibration of the central sleeve is arranged between the outer sleeve and the central sleeve; and the elastic damping assembly is provided with an automobile body suspension inner pipe which is communicated with the central sleeve and coaxially arranged.
Further said resilient means comprises a central resilient plate; the central elastic plate is a rubber ring with an inner ring fixed on the outer side of the central sleeve, and an outer ring of the central elastic plate can move along the axial direction of the central sleeve and is connected to the end surface of the inner side of the outer sleeve in a sealing mode.
The elastic device further comprises an upper elastic plate and a lower elastic plate which are respectively arranged at the upper side and the lower side of the central elastic plate; the upper elastic plate and the lower elastic plate are rubber rings, the outer rings of the rubber rings are in sealing connection with the end faces of the inner sides of the outer sleeves, the inner rings of the upper elastic plate and the lower elastic plate can generate relative displacement with the central sleeve along the axial direction and are in sealing connection with the central sleeve, an upper cavity is formed in the space between the upper elastic plate and the central elastic plate, and a lower cavity is formed in the space between the lower elastic plate and the central elastic plate.
A circle of first bosses protruding outwards along the radial direction are arranged on the end face of the outer side of the circumference of the central sleeve; a flow passage is formed in the first boss; one end of the flow channel is communicated with the upper cavity, and the other end of the flow channel is communicated with the lower cavity through the first boss.
The elastic damping component further comprises an upper connecting plate and a lower connecting plate fixedly connected with the frame; a rubber block with a buffering function is arranged between the upper connecting plate and the lower connecting plate; the automobile body suspension inner tube passes upper junction plate, rubber block and lower connecting plate from top to bottom in proper order, and the lower extreme of automobile body suspension inner tube supports tightly to be connected in central sheathed tube upper end.
A circle of clamping grooves are formed in the inner side of the lower end of the vehicle body suspension inner pipe; the upper end of the central sleeve is clamped in the clamping groove to limit non-axial relative displacement between the central sleeve and the vehicle body suspension inner tube.
The assembly casing is coated on the outer side of the outer sleeve and provided with an opening at the upper end; the outer sleeve is fixed in the assembly shell; the upper end of the assembling shell extends towards one side far away from the central sleeve along the radial direction of the central sleeve to form a bottom plate fixedly connected with the lower connecting plate through a bolt structure.
A circle of second bosses protruding towards the central sleeve along the radial direction of the central sleeve are further arranged at the inner side of the outer sleeve corresponding to the position of the central elastic plate; the upper side and the lower side of the second boss are hermetically clamped with outer liner pipes which are respectively and fixedly connected with the end parts of the upper elastic plate and the lower elastic plate in a sealing way; and lining pipes which are respectively fixedly connected with the other side ends of the upper elastic plate and the lower elastic plate in a sealing way are arranged on the upper side and the lower side of the first boss of the central sleeve.
A vehicle body suspension is characterized in that: comprises a frame; and the frame is provided with a plurality of composite hydraulic damping devices.
The plurality of composite hydraulic damping devices are further arranged on two transverse sides of the frame in a pairwise symmetrical mode by taking the longitudinal center line of the frame as a center, and the connecting line of the two composite hydraulic damping devices in the same group is perpendicular to the longitudinal center line of the frame.
The invention has the advantages that: 1. the elastic damping assembly and the hydraulic damping assembly are combined, so that a good buffering and vibration damping effect can be achieved, the elastic device is further integrated in the hydraulic damping assembly, the elastic device can well buffer transverse direction vibration, transverse vibration energy is dissipated and absorbed through the elastic device, damage to the whole device is avoided, and the service life of the device is greatly prolonged;
2. the elastic device comprises three elastic plates, namely an upper elastic plate, a lower elastic plate and a central elastic plate, wherein the three elastic plates can absorb vibration energy in the transverse direction of the central sleeve, so that the transverse vibration energy dissipation efficiency is extremely high, the structure is simple, and the installation is convenient;
3. the rubber block is used as a main energy absorption component of the elastic damping assembly, so that the energy absorption device is good in energy absorption effect, simple in structure and extremely convenient to operate and install.
The damping device has the advantages of simple structure, small occupied space, light weight, convenience in installation and excellent damping effect, can bear the load from each direction on the vehicle body, and has great popularization value.
Drawings
FIG. 1: an axial view of the damping device of the present invention;
FIG. 2: a cross-sectional view of the damping device of the present invention;
FIG. 3: a cross-sectional view of the hydraulic damping assembly of the present invention;
FIG. 4 is a schematic view of: the invention is a schematic view of a flow channel arrangement structure;
FIG. 5: the damping device of the invention is installed the structure schematic diagram;
FIG. 6: the invention discloses a schematic view of a mounting structure of a damping device on a frame;
wherein: 1-outer sleeve; 2-a central sleeve; 3, an upper cavity; 4-lower cavity; 5, a flow channel; 6, suspending the inner tube on the vehicle body; 7-a central elastic plate; 8, an upper elastic plate; 9-lower elastic plate; 10-a first boss; 11-an upper connecting plate; 12-a lower connecting plate; 13-rubber block; 14-assembling the housing; 15-a base plate; 16-a second boss; 17-an outer liner tube; 18-lining tube; 19-vehicle frame.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1-6, the compound hydraulic damping device of this embodiment, including elastic damping subassembly and hydraulic damping subassembly, the elastic damping subassembly is as shown in fig. 1-2, including upper junction plate 11 and the lower connecting plate 12 that links firmly with the frame, be provided with the rubber block 13 that plays cushioning effect between upper junction plate 11 and the lower connecting plate 12, wear to be equipped with automobile body suspension inner tube 6 on the rubber block 13, automobile body suspension inner tube 6 from top to bottom passes upper junction plate 11 in proper order, rubber block 13 and lower connecting plate 12, the upper and lower both ends opening of automobile body suspension inner tube 6, wear to be equipped with bolt and body connection in the middle of. The rubber block 13 can well absorb the load in all directions and has good vibration damping effect.
The hydraulic damping component is shown in fig. 2-3, and comprises a hollow and sealed outer sleeve 1 and a central sleeve 2 penetrating through the outer sleeve 1, wherein three elastic plates are sequentially arranged in the outer sleeve 1 from top right to bottom and comprise an upper elastic plate 8, a central elastic plate 7 and a lower elastic plate 9, and the three elastic plates are of annular structures made of elastic rubber materials. A circle of first bosses 10 protruding outwards in the radial direction are arranged on the end face of the outer side of the circumference of the central sleeve 2, and the central elastic plate 7 surrounds the outer sides of the first bosses 10 and is fixedly connected with the first bosses 10 and can move up and down along with the central sleeve 2 to achieve the hydraulic effect.
The inner ring of the central elastic plate 7 is fixed on the first boss 10 outside the central sleeve 2, a circle of second bosses 16 protruding towards the central sleeve 2 along the radial direction of the central sleeve 2 is arranged at the position, corresponding to the central elastic plate 7, on the inner side of the outer sleeve 1, and the outer ring of the central elastic plate 7 can be connected on the second bosses 16 in a sealing manner along the axial direction of the central sleeve 2.
The upper elastic plate 8 and the lower elastic plate 9 are respectively arranged at the upper side and the lower side of the central elastic plate 7. The upper and lower sides of the second boss 16 are sealed and clamped with outer liner tubes 17 which are respectively and fixedly connected with the end parts of the upper elastic plate 8 and the lower elastic plate 9 in a sealing way, and the central sleeve 2 is provided with inner liner tubes 18 which are respectively and fixedly connected with the end parts of the upper elastic plate 8 and the lower elastic plate 9 in a sealing way at the upper and lower sides of the first boss 10. The outer rings of the upper elastic plate 8 and the lower elastic plate 9 are hermetically connected with the end surface of the inner side of the outer sleeve 1 through an inner lining pipe 17, the inner rings of the upper elastic plate 8 and the lower elastic plate 9 can be hermetically connected to an outer lining pipe 18 on the central sleeve 2 in a way of generating relative displacement along the axial direction, the space between the upper elastic plate 8 and the central elastic plate 7 forms an upper cavity 3, and the space between the lower elastic plate 9 and the central elastic plate 7 forms a lower cavity 4. As shown in fig. 4, a flow channel 5 is formed in the first boss 10, one end of the flow channel 5 communicates with the upper cavity 3, and the other end thereof communicates with the lower cavity 4 through the first boss 10.
When the load along the axial direction of the central sleeve 2 changes, the central sleeve 2 generates relative displacement along the axial direction with the outer sleeve 1, the central elastic plate 7 moves along the axial direction of the central sleeve 2 to extrude the upper cavity 3 or the lower cavity 4, damping liquid flows between the upper cavity 3 and the lower cavity 4 through the flow channel 5, when the damping liquid flows in the flow channel 5, damping characteristics can be generated, and different damping peak frequencies and corresponding maximum damping can be obtained by adjusting the length and the section size of the flow channel 5.
In addition, because the central elastic plate 7, the upper elastic plate 8 and the lower elastic plate 9 are all elastic rubber plate-shaped structures, when relative displacement is generated between the central sleeve 2 and the outer sleeve 1 along the horizontal transverse direction, namely along the radial direction of the central sleeve 2, transverse energy can be absorbed or dissipated through the central elastic plate 7, the upper elastic plate 8 and the lower elastic plate 9, and a good vibration damping effect is achieved.
The hydraulic damping subassembly and the elastic damping subassembly of this embodiment are installed together, as shown in fig. 1-2, still include the cladding at the open-ended assembly shell 14 in the upper end in the outer tube 1 outside, and in outer tube 1 was fixed in assembly shell 14, the upper end of assembly shell 14 extended to one side of keeping away from central tube 2 along central tube 2's radial direction and formed the bottom plate 15 that links firmly through bolt structure and lower connecting plate 12. The vehicle body suspension inner tube 6 in the elastic damping assembly is in butt joint communication with the central sleeve 2 in the hydraulic damping assembly, a circle of clamping groove is formed in the inner side of the lower end of the vehicle body suspension inner tube 6, and the upper end of the central sleeve 2 is clamped in the clamping groove to limit non-axial relative displacement between the central sleeve 2 and the vehicle body suspension inner tube 6. The central sleeve 2 and the vehicle body suspension inner pipe 6 are coaxially arranged, and bolts connected with a vehicle body penetrate through the central sleeve 2 and the vehicle body suspension inner pipe 6.
The compound hydraulic damping device of the embodiment is installed on the frame 19, and a plurality of compound hydraulic damping devices are installed on the frame 19. As shown in fig. 6, a1, a2, A3 and a4, the multiple complex hydraulic damping devices are symmetrically arranged on two sides of the frame 19 in the transverse direction by taking the longitudinal center line of the frame 19 as the center, and the connecting line of the two complex hydraulic damping devices in the same group is perpendicular to the longitudinal center line of the frame 19.
As shown in fig. 6, the longitudinal direction of the present embodiment refers to the left-right direction in fig. 6, and the lateral direction refers to the up-down direction in fig. 6; the up-down direction of the present embodiment refers to the up-down direction in fig. 2.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A compound hydraulic damping device, includes elastic damping subassembly its characterized in that: the hydraulic damping component is connected to the lower end of the elastic damping component; the hydraulic damping component comprises a hollow and closed outer sleeve (1) and a central sleeve (2) penetrating through the outer sleeve (1); an upper cavity (3) and a lower cavity (4) which are used for containing damping fluid and have variable cavity volumes are arranged in the outer sleeve (1); the central sleeve (2) penetrates through the upper cavity (3) and the lower cavity (4), and a flow channel (5) which is used for communicating the upper cavity (3) and the lower cavity (4) when the volumes of the upper cavity (3) and the lower cavity (4) are changed due to tension or compression is arranged on the central sleeve (2); an elastic device for eliminating the transverse vibration of the central sleeve (2) is arranged between the outer sleeve (1) and the central sleeve (2); an automobile body suspension inner pipe (6) which is communicated with the central sleeve (2) and is coaxially arranged penetrates through the elastic damping component;
the elastic means comprise a central elastic plate (7); the central elastic plate (7) is a rubber ring with an inner ring fixed on the outer side of the central sleeve (2), and an outer ring of the central elastic plate (7) can move along the axial direction of the central sleeve (2) and is connected to the end surface of the inner side of the outer sleeve (1) in a sealing manner; the elastic device also comprises an upper elastic plate (8) and a lower elastic plate (9) which are respectively arranged at the upper side and the lower side of the central elastic plate (7); the space between the upper elastic plate (8) and the central elastic plate (7) forms an upper cavity (3), and the space between the lower elastic plate (9) and the central elastic plate (7) forms a lower cavity (4);
a circle of second bosses (16) which are protruded towards the central sleeve (2) along the radial direction of the central sleeve (2) are arranged at the inner side of the outer sleeve (1) corresponding to the position of the central elastic plate (7); the upper side and the lower side of the second boss (16) are hermetically clamped with outer liner tubes (17) which are respectively fixedly connected with the end parts of the upper elastic plate (8) and the lower elastic plate (9) in a sealing way; the central sleeve (2) is provided with lining pipes (18) which are positioned at the upper side and the lower side of the first boss (10) and are respectively connected with the end parts of the other sides of the upper elastic plate (8) and the lower elastic plate (9) in a sealing way; the inner rings of the upper elastic plate (8) and the lower elastic plate (9) and the lining pipe (18) on the central sleeve (2) can generate relative displacement along the axial direction and are connected to the lining pipe (18) in a sealing way;
a circle of first bosses (10) protruding outwards in the radial direction are arranged on the end face of the outer side of the circumference of the central sleeve (2); a flow channel (5) is formed in the first boss (10); one end of the flow channel (5) is communicated with the upper cavity (3), and the other end of the flow channel is communicated with the lower cavity (4) by penetrating through the first boss (10).
2. A compound hydraulic damping device as defined in claim 1 in which: the elastic damping component comprises an upper connecting plate (11) and a lower connecting plate (12) fixedly connected with the frame (19); a rubber block (13) with a buffering function is arranged between the upper connecting plate (11) and the lower connecting plate (12); the automobile body suspension inner tube (6) sequentially penetrates through the upper connecting plate (11), the rubber block (13) and the lower connecting plate (12) from top to bottom, and the lower end of the automobile body suspension inner tube (6) is connected to the upper end of the central sleeve (2) in a propping mode.
3. A compound hydraulic damping device as defined in claim 2 in which: a circle of clamping grooves are formed in the inner side of the lower end of the vehicle body suspension inner pipe (6); the upper end of the central sleeve (2) is clamped in the clamping groove to limit non-axial relative displacement between the central sleeve (2) and the vehicle body suspension inner tube (6).
4. A compound hydraulic damping device as defined in claim 2 in which: the outer sleeve is characterized by also comprising an assembly shell (14) coated on the outer side of the outer sleeve (1) and provided with an opening at the upper end; the outer sleeve (1) is fixed in the assembly shell (14); the upper end of the assembling shell (14) extends towards one side far away from the central sleeve (2) along the radial direction of the central sleeve (2) to form a bottom plate (15) fixedly connected with the lower connecting plate (12) through a bolt structure.
5. A vehicle body suspension is characterized in that: comprises a frame; the frame (19) is provided with a plurality of composite hydraulic damping devices according to any one of claims 1 to 4.
6. A vehicle body mount according to claim 5 wherein: the multiple composite hydraulic damping devices are symmetrically arranged on the two transverse sides of the frame (19) in pairs by taking the longitudinal center line of the frame (19) as the center, and the connecting line of the two composite hydraulic damping devices in the same group is perpendicular to the longitudinal center line of the frame (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158351.7A CN112356924B (en) | 2020-10-26 | 2020-10-26 | Composite hydraulic damping device and vehicle body suspension |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158351.7A CN112356924B (en) | 2020-10-26 | 2020-10-26 | Composite hydraulic damping device and vehicle body suspension |
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| Publication Number | Publication Date |
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| CN112356924A CN112356924A (en) | 2021-02-12 |
| CN112356924B true CN112356924B (en) | 2022-08-23 |
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| CN202011158351.7A Active CN112356924B (en) | 2020-10-26 | 2020-10-26 | Composite hydraulic damping device and vehicle body suspension |
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|---|---|---|---|---|
| US5213313A (en) * | 1990-07-19 | 1993-05-25 | Tokai Rubber Industries, Ltd. | Fluid-filled cylindrical elastic mount having lateral and radial elastic walls for desired axial and diametric spring characteristics |
| CN204553666U (en) * | 2015-03-17 | 2015-08-12 | 黄庆盛 | A kind of shock-resistant hydraulic damper |
| CN110924288A (en) * | 2019-11-13 | 2020-03-27 | 株洲时代新材料科技股份有限公司 | Viscous damper |
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| KR100809035B1 (en) * | 2006-05-17 | 2008-03-04 | (주)디티알 | Bush type hydraulic rubber mount and method for making the same |
| US8308148B2 (en) * | 2007-05-31 | 2012-11-13 | Ford Global Technologies, Llc | Plug-in body mount damping device for vehicles |
| US20090102218A1 (en) * | 2007-10-22 | 2009-04-23 | Freudenberg-Nok General Partnership | Body Mount Assembly With Hydraulic Damping Capability |
| JP5132590B2 (en) * | 2009-01-23 | 2013-01-30 | カヤバ工業株式会社 | Shock absorber |
| CN203977611U (en) * | 2014-05-30 | 2014-12-03 | 重庆大学 | The piston type damper that a kind of saturated sand is filled |
| CN104315076B (en) * | 2014-09-12 | 2016-04-27 | 东风小康汽车有限公司重庆分公司 | Automotive suspension self-adapting changeable damping force hydraulic rubber vibration isolation device |
| US10788095B2 (en) * | 2017-06-26 | 2020-09-29 | Hrl Laboratories, Llc | Fluid and elastomer vibration isolator |
| CN206938861U (en) * | 2017-07-24 | 2018-01-30 | 江铃汽车股份有限公司 | A kind of body mount structure |
| CN207389316U (en) * | 2017-09-30 | 2018-05-22 | 广州华凯车辆装备有限公司 | A kind of armored car body suspending apparatus |
| CN210397567U (en) * | 2019-06-12 | 2020-04-24 | 广州汽车集团股份有限公司 | Hydraulic bushing, vehicle front suspension system and vehicle |
| CN111043228A (en) * | 2020-01-07 | 2020-04-21 | 柳州日高汽车减振技术有限责任公司 | Hydraulic bushing of commercial vehicle cab |
| CN111795103A (en) * | 2020-07-02 | 2020-10-20 | 诺博橡胶制品有限公司 | Two-way high damping hydraulic pressure sub vehicle frame bush and car |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5213313A (en) * | 1990-07-19 | 1993-05-25 | Tokai Rubber Industries, Ltd. | Fluid-filled cylindrical elastic mount having lateral and radial elastic walls for desired axial and diametric spring characteristics |
| CN204553666U (en) * | 2015-03-17 | 2015-08-12 | 黄庆盛 | A kind of shock-resistant hydraulic damper |
| CN110924288A (en) * | 2019-11-13 | 2020-03-27 | 株洲时代新材料科技股份有限公司 | Viscous damper |
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| CN112356924A (en) | 2021-02-12 |
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