CN114033808A - Integral spiral labyrinth damping coupling - Google Patents
Integral spiral labyrinth damping coupling Download PDFInfo
- Publication number
- CN114033808A CN114033808A CN202111404582.6A CN202111404582A CN114033808A CN 114033808 A CN114033808 A CN 114033808A CN 202111404582 A CN202111404582 A CN 202111404582A CN 114033808 A CN114033808 A CN 114033808A
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- Prior art keywords
- damping
- labyrinth
- coupling
- spiral
- spiral labyrinth
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- Pending
Links
- 238000013016 damping Methods 0.000 title claims abstract description 126
- 230000008878 coupling Effects 0.000 title claims abstract description 71
- 238000010168 coupling process Methods 0.000 title claims abstract description 71
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 71
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 3
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 claims 1
- 239000000314 lubricant Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 229920002545 silicone oil Polymers 0.000 claims 1
- 229940083037 simethicone Drugs 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 9
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 244000273256 Phragmites communis Species 0.000 description 6
- 235000014676 Phragmites communis Nutrition 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
-
- 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
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/129—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon characterised by friction-damping means
-
- 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
Abstract
The invention discloses an integral spiral labyrinth damping coupling, which is used for inhibiting torsional vibration of a shafting and belongs to the field of vibration control. The integrated spiral labyrinth damping coupling comprises a spiral labyrinth coupling body, a driven end sealing cover, a driving shaft connecting key groove, a driven shaft connecting key groove, a damping liquid cavity, a spiral labyrinth damping area, an O-shaped sealing ring, a damping liquid injection hole and a damping liquid discharge hole. The integral spiral labyrinth damping coupling can change the torsional natural frequency of a shafting, has the vibration isolation function, and simultaneously generates an extrusion damping effect and a friction damping effect in a spiral labyrinth damping area to dissipate vibration energy. The integral spiral labyrinth damping coupling is integrally processed, has few required elements, has the capacity of bearing heavy load and good shock resistance, can effectively inhibit the problem of torsional vibration of rotating machinery, and has wide application prospect in the fields of petrochemical industry, aerospace, ships, electric power and the like.
Description
Technical Field
The invention mainly relates to an integral spiral labyrinth damping coupling arranged between rotor shaft systems, which is used for controlling torsional vibration of the shaft systems, can be widely applied to the fields of petrochemical industry, aerospace, ships, electric power and the like, and belongs to the technical field of vibration reduction.
Background
In recent years, petrochemical industry, aerospace industry, ships, electric power industry and the like are rapidly developed, so that various mechanical equipment is developed towards high rotating speed, high load and high efficiency. When the torsional natural frequency of the rotor system is the same as or close to the torsional vibration frequency, resonance phenomenon can be generated, and thus the torsional stress of a shafting is greatly increased. At the same time, these vibrations are transmitted to other equipment and components, causing the rotor system to vibrate strongly. The torsional vibration can reduce the service life of a rotor shafting and threatens the safe operation of a machine set, so that how to solve the torsional vibration of the rotary machine is very important and needs to be solved urgently.
For the problem of torsional vibration of a rotary mechanical shafting, not only the torsional vibration needs to be calculated in detail in the design stage, but also a damping device needs to be installed to control the torsional vibration in the operation process. The coupler is used as a key part for connecting the driving shaft and the driven shaft and can control the torsional vibration of the shafting. At present, the shaft couplings are mainly divided into two types, one is a rigid shaft coupling, and the other is a flexible shaft coupling.
The rigid coupling has a high requirement for the alignment of the two shafts, and when the two shafts are displaced relative to each other, additional load is caused in the machine, which deteriorates the working condition. The flexible coupling mainly comprises a non-elastic element flexible coupling and an elastic element flexible coupling. The non-elastic element flexible coupler comprises a slider coupler, a gear coupler and the like, the slider coupler has small compensation amount, the required installation precision is high, and the slider is fast in abrasion and large in noise. The gear coupling has the oil leakage, the problem of jumping at high speed is obvious, the gear is easy to wear and break, the noise is obvious and the like. The flexible coupling with the elastic element, such as a plum blossom elastic coupling, is suitable for high-speed and medium-speed transmission shafting, has high reliability, but is not suitable for low-speed and heavy-load transmission, has high requirement on the centering of two shafts when the elastic element is replaced, and once the plum blossom elastic spacer is damaged or fails, torque transmission cannot be interrupted, and simultaneously, the metal claws of the two shaft sleeves are meshed together to continue to transmit torque, so that the rotor system is dangerous. The diaphragm coupling relies on the stacked diaphragms as elastic elements for torsional vibration control, but the coupling is not sealed and needs to be cleaned frequently, and the diaphragms can be abraded to influence the normal use of the coupling. The snake-shaped spring coupling mainly comprises two half couplings, two half outer covers, a seal, snake-shaped reeds and the like, wherein the snake-shaped reeds are embedded into tooth grooves of the couplings to transmit torque, and the deformation of the reeds is used for avoiding resonance. However, the snake-shaped reeds and the shaft coupling are of split type independent structures, vibration is reduced by means of elasticity of the snake-shaped reeds, and cracks are easily generated due to stress concentration at the bent positions of the reeds.
The integral spiral labyrinth damping coupling structure designed by the invention is an integral forming processing technology, and the required elements are few; and the elastic element and the coupling are integrated into a whole without abrasion, so that the stress distribution is uniform. The spiral labyrinth damping area has lower rigidity, and the natural frequency of a shafting can be changed, so that the resonance problem of the rotor in the working rotating speed range is avoided. Meanwhile, the spiral labyrinth damping area has certain elasticity and can play a role in vibration isolation. When the spiral labyrinth damping area is filled with damping liquid, friction damping can be generated in the spiral area, extrusion damping can be generated in the labyrinth area, and the vibration energy can be effectively absorbed by the high-damping effect.
Disclosure of Invention
The invention designs an integral spiral labyrinth damping coupler, which aims at the problem of shafting torsional vibration of rotating machinery and solves the problem of shafting vibration. The integral spiral labyrinth damping coupler can adjust the natural frequency of a shaft system to avoid a resonance area, has the vibration isolation effect, and can generate friction damping and extrusion damping effect to dissipate vibration energy when the spiral labyrinth damping area is deformed after being filled with damping liquid. The integral spiral labyrinth damping coupling has quick and sensitive response to torsional vibration of a rotating mechanical shaft system, is wide in applicable frequency band and has good inhibition effect on impact vibration.
In order to realize the purpose, the invention adopts the following technical scheme:
the integrated spiral labyrinth damping coupling comprises a spiral labyrinth coupling, a driven shaft end sealing cover, a driving shaft end sealing cover, a damping liquid cavity, a spiral labyrinth damping area, an O-shaped sealing ring, a damping liquid injection hole and a damping liquid discharge hole. The technical scheme aims to solve the problem of torsional vibration of a rotary mechanical shaft system. The spiral labyrinth coupling is connected with the driven shaft end sealing cover and the driving shaft end sealing cover through bolts, and meanwhile, the O-shaped sealing ring is used for sealing damping liquid. And finally, the integral spiral labyrinth type damping coupling is arranged at the shaft end part between the driving shaft and the driven shaft. When torsional vibration is generated in the operation process of the shaft system, the spiral labyrinth damping area has lower rigidity and certain elasticity, the natural frequency of the shaft system can be changed, the vibration isolation effect can be generated, the deformation of the spiral area and the labyrinth area can generate a friction damping effect and an extrusion damping effect, vibration energy is effectively dissipated, a good vibration attenuation effect is achieved, and therefore the safe operation of the rotary machine is protected.
The spiral labyrinth damping area in the integral spiral labyrinth damping coupling has lower rigidity and certain elasticity, can change the natural frequency of a system and has the function of vibration isolation, and meanwhile, the spiral area and the labyrinth area can rub and extrude damping liquid under the action of a torsional action force to dissipate vibration energy.
A damping liquid cavity is formed between the end covers at the two sides and the spiral labyrinth coupling, the driven shaft end sealing cover is provided with a damping liquid discharging hole and an injection hole, but the driving shaft end sealing cover is not provided with the structure.
The sealing between the end covers at the two sides and the spiral labyrinth coupling is realized by adopting an O-shaped ring, the O-shaped ring can be used for both dynamic sealing and static sealing, and the O-shaped ring has good sealing capability, so that the damping coupling can play a good vibration damping effect.
The invention has the following characteristics:
(1) the shaft coupling is of an integral structure, is matched with the shaft end of a shaft system, and is convenient to install and disassemble.
(2) The end covers on the two sides of the coupler are connected with the elastic damping blocks through bolts, and the end covers and the elastic damping blocks are sealed by O-shaped rings in the axial direction and the radial direction.
(3) The spiral labyrinth damping area of the coupling can change the natural frequency of a shaft system to avoid the harm of resonance, has the vibration isolation effect, and generates friction damping and extrusion damping effects to dissipate vibration energy.
(4) The coupler has wide vibration damping frequency band and is also effective to impact torsional vibration.
Compared with the existing torsional vibration damping device, the invention has the following advantages:
(1) the spiral labyrinth coupling of the coupling is integrally processed, the number of elements is small, elastic elements have no wear parts, the elastic elements do not need to be replaced, stress concentration is avoided, and the mounting and dismounting are convenient.
(2) The shaft coupling integrates frequency modulation, provides reaction force, vibration isolation and damping dissipation energy, and effectively reduces the problem of shafting vibration from multiple angles.
(3) The shaft coupling can be designed in different specifications according to different shaft systems, has a compact structure, saves space and has good advantages in vibration reduction.
(4) The rigidity and the damping of the coupler are in a decoupling state, are not affected with each other, and the problem of nonlinearity is solved.
(5) The coupling is self-adjusting to varying degrees of vibration.
Drawings
FIG. 1 is an isometric view of an integrated labyrinth damping coupling installation;
FIG. 2 is an isometric view of an integrated spiral labyrinth damping coupling;
FIG. 3 is a cross-sectional view of the integrated spiral labyrinth damping coupling;
FIG. 4 is a front view of a spiral labyrinth damping region and a damping energy consumption mechanism diagram;
in the figure: 1-driving shaft, 2-integral spiral labyrinth damping coupling, 3-driven shaft, 201-driven shaft end sealing cover, 202-spiral labyrinth coupling, 203-driving shaft end sealing cover, 204-damping liquid cavity, 205-driving end connecting key groove, 206-spiral labyrinth damping area, 207-O type sealing ring, 208-damping liquid discharging hole, 209-driven end connecting key groove and 210-damping liquid injection hole.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 to 4.
The invention designs an integral spiral labyrinth damping coupling, which is applied to a rotating mechanical shaft system, relates to the field of vibration reduction of mechanical devices, is convenient to install, has lower rigidity and certain elasticity, can adjust the natural frequency of the shaft system, has a vibration isolation effect, provides an acting force opposite to the torsion direction, and can generate functions of a friction damping effect, an extrusion damping effect and the like. Fig. 1 is an isometric view of the integrated spiral labyrinth damping coupling installed in a shafting. The transmission system utilizes a driving shaft 1 to be connected with a driven shaft 3 through an integral spiral labyrinth damping coupler 2, and the driving shaft 1 drives the driven shaft 3 to rotate.
As shown in fig. 2 and fig. 3, the integrated spiral labyrinth damping coupling is composed of a driven shaft end sealing cover 201, a spiral labyrinth coupling 202, a driving shaft end sealing cover 203, a damping fluid cavity 204, a driving end connecting key groove 205, a spiral labyrinth damping area 206, an O-shaped sealing ring 207, a damping fluid discharge hole 208, a driven end connecting key groove 209 and a damping fluid injection hole 210. The spiral labyrinth coupling 202 comprises a spiral labyrinth damping area 206 and a driven end connecting key 209, wherein the spiral labyrinth damping area 206 is integrally machined, and the elastic structure is in a spiral labyrinth shape. The driven shaft end sealing cover 201 and the driving shaft end sealing cover 203 are respectively installed on both sides of the spiral labyrinth coupling 202, and are connected by bolts, and are sealed by the damping fluid by the O-ring 207. The chamber formed between the two side end covers and the spiral labyrinth coupling 202 is a damping fluid chamber 204. The damping fluid discharge holes 208 and the damping fluid injection holes 210 are symmetrically distributed on the driven shaft end sealing cover 201 at 180 degrees. Damping fluid fills damping fluid chamber 204 through damping fluid injection holes 210. The damping fluid injection holes 210 and the damping fluid discharge holes 208 are plugged with bolts.
The driving shaft 1 is connected with the outer ring of the integrated spiral labyrinth damping coupling device 2, the driven shaft 3 is connected with the inner ring of the integrated spiral labyrinth damping coupling device 2, when the torque between the driving shaft 1 and the driven shaft 3 is not matched to generate vibration, the vibration is transmitted to the spiral labyrinth coupling 202 of the integrated spiral labyrinth damping coupling device 2 as shown in figure 4, a spiral labyrinth damping area 206 on the spiral labyrinth coupling 202 is filled with damping liquid, when the spiral labyrinth damping area 206 is deformed by torsional vibration and torsional force, the spiral area is in torsional deformation, and the labyrinth area is in extrusion deformation. The spiral labyrinth damping region 206 has a low stiffness and a certain elasticity, which can change the natural frequency of the structure and provide a force opposite to the torsional vibration direction, and has a vibration isolation effect. When the spiral labyrinth damping area 206 is deformed, the damping fluid inside the spiral labyrinth damping area is subjected to torsional friction and extrusion to generate a friction damping effect and an extrusion damping effect, so that vibration energy can be effectively dissipated. Therefore, the damping coupling has a good damping effect, and the safe operation of the driving shaft 1 and the driven shaft 3 is ensured.
Claims (7)
1. The integral spiral labyrinth damping coupling comprises a driven shaft end sealing cover 201, a spiral labyrinth coupling 202, a driving shaft end sealing cover 203, a damping liquid cavity 204, a driving end connecting key groove 205, a spiral labyrinth damping region 206, an O-shaped sealing ring 207, a damping liquid discharging hole 208, a driven end connecting key groove 209 and a damping liquid injecting hole 210, and is characterized in that the spiral labyrinth coupling 202 is connected with the driven shaft end sealing cover 201 and the driving shaft end sealing cover 203 through bolts.
2. The labyrinth coupling 202 as claimed in claim 1, wherein the labyrinth coupling 202 is provided with a plurality of sections of the labyrinth damping zones 206 formed integrally and penetrating in the axial direction of the coupling, wherein the labyrinth damping zones 206 are spiral segments dividing the coupling into an inner edge and an outer edge.
3. The spiral labyrinth damping region 206 as recited in claim 1, further comprising a plurality of layers of spiral labyrinth damping regions, each layer of spiral damping region having a plurality of labyrinth regions, adjacent labyrinth regions differing by 45 °.
4. The damping fluid according to claim 1, which is a fluid such as a lubricant, silicone oil, or simethicone.
5. Driven shaft end seal cap 201 and driving shaft end seal cap 203 as claimed in claim 1 wherein driven shaft end seal cap 201 is provided with damping fluid discharge hole 208, damping fluid injection hole 210 and O-ring 207 and driving shaft end seal cap 203 is provided with driving end coupling keyway 205 and O-ring 207.
6. The damping fluid injection hole 210 and the damping fluid discharge hole 208 as claimed in claim 5, wherein the two are symmetrically distributed on the driven shaft end sealing cover 201 at an angle of 180 ° and are positioned to ensure that the damping fluid can completely fill the damping fluid chamber 204 and the spiral labyrinth damping region 206.
7. The coupling as claimed in claim 1, wherein the labyrinth damping area 206 of the labyrinth coupling 202 can reduce the non-linearity of the stiffness and damping, the labyrinth elastic damping area 206 has a lower stiffness and a certain elasticity, and can change the natural frequency of the shaft system to avoid resonance and vibration isolation, and when the labyrinth elastic damping area 206 is deformed, the damping fluid is twisted and squeezed to generate a good frictional damping and squeezing damping effect to effectively dissipate the vibration energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111404582.6A CN114033808A (en) | 2021-11-24 | 2021-11-24 | Integral spiral labyrinth damping coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111404582.6A CN114033808A (en) | 2021-11-24 | 2021-11-24 | Integral spiral labyrinth damping coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114033808A true CN114033808A (en) | 2022-02-11 |
Family
ID=80138649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111404582.6A Pending CN114033808A (en) | 2021-11-24 | 2021-11-24 | Integral spiral labyrinth damping coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114033808A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB445255A (en) * | 1934-12-26 | 1936-04-06 | Maurice Houdaille | Improvements in resilient joints |
| EP0286527A1 (en) * | 1987-04-03 | 1988-10-12 | Caoutchouc Manufacture Et Plastiques | Elastic support using hydraulic damping, incorporating a rigid partition having an adjustable liquid-circuit |
| DE4006121A1 (en) * | 1990-02-27 | 1991-08-29 | Opel Adam Ag | Torsional vibration damper with drive and driven part - has at least one spiral spring in damping chamber, with hub part and outer flange |
| CN1414262A (en) * | 2001-10-22 | 2003-04-30 | 艾勒根驱动工程有限责任公司 | Transmission with torsion vibration absorber and torsional flexibility coupling |
| JP2004278580A (en) * | 2003-03-13 | 2004-10-07 | Hiroshi Kamiyoshi | Tubular damper element |
| CN102705427A (en) * | 2012-06-12 | 2012-10-03 | 中国科学院工程热物理研究所 | Squeeze film damper |
| CN109611495A (en) * | 2018-11-30 | 2019-04-12 | 北京化工大学 | Rotor damper |
| RU191235U1 (en) * | 2019-02-18 | 2019-07-30 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.) | COMBINED ELASTIC ELEMENT FOR DAMPING SYSTEMS |
| WO2020069933A1 (en) * | 2018-10-02 | 2020-04-09 | Hasse & Wrede Gmbh | Elastic coupling |
-
2021
- 2021-11-24 CN CN202111404582.6A patent/CN114033808A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB445255A (en) * | 1934-12-26 | 1936-04-06 | Maurice Houdaille | Improvements in resilient joints |
| EP0286527A1 (en) * | 1987-04-03 | 1988-10-12 | Caoutchouc Manufacture Et Plastiques | Elastic support using hydraulic damping, incorporating a rigid partition having an adjustable liquid-circuit |
| DE4006121A1 (en) * | 1990-02-27 | 1991-08-29 | Opel Adam Ag | Torsional vibration damper with drive and driven part - has at least one spiral spring in damping chamber, with hub part and outer flange |
| CN1414262A (en) * | 2001-10-22 | 2003-04-30 | 艾勒根驱动工程有限责任公司 | Transmission with torsion vibration absorber and torsional flexibility coupling |
| JP2004278580A (en) * | 2003-03-13 | 2004-10-07 | Hiroshi Kamiyoshi | Tubular damper element |
| CN102705427A (en) * | 2012-06-12 | 2012-10-03 | 中国科学院工程热物理研究所 | Squeeze film damper |
| WO2020069933A1 (en) * | 2018-10-02 | 2020-04-09 | Hasse & Wrede Gmbh | Elastic coupling |
| CN109611495A (en) * | 2018-11-30 | 2019-04-12 | 北京化工大学 | Rotor damper |
| RU191235U1 (en) * | 2019-02-18 | 2019-07-30 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.) | COMBINED ELASTIC ELEMENT FOR DAMPING SYSTEMS |
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