CN114382823B - Auxiliary spring and air spring of railway vehicle - Google Patents
Auxiliary spring and air spring of railway vehicle Download PDFInfo
- Publication number
- CN114382823B CN114382823B CN202210058934.5A CN202210058934A CN114382823B CN 114382823 B CN114382823 B CN 114382823B CN 202210058934 A CN202210058934 A CN 202210058934A CN 114382823 B CN114382823 B CN 114382823B
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- Prior art keywords
- auxiliary spring
- rubber body
- conical
- spring
- spring rubber
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- 239000003292 glue Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
-
- 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
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
- F16F15/0232—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means with at least one gas spring
-
- 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
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to an auxiliary spring and an air spring of a railway vehicle, wherein the auxiliary spring comprises a conical auxiliary spring rubber body, a connecting seat and a flat auxiliary spring rubber body, wherein the conical auxiliary spring rubber body, the connecting seat and the flat auxiliary spring rubber body are arranged around a mandrel; the flat auxiliary spring rubber body is positioned below the conical auxiliary spring rubber body, and the connecting seat is positioned between the conical auxiliary spring rubber body and the flat auxiliary spring rubber body; at least one glue injection hole is formed in the connecting seat, and the conical auxiliary spring rubber body and the flat auxiliary spring rubber body are communicated through the glue injection hole to form an integrated structure. The invention solves the technical problems of complex structure, more parts, complex process and limited deformability of the traditional compound auxiliary spring.
Description
Technical Field
The invention belongs to the technical field of railway vehicles, and particularly relates to an auxiliary spring and an air spring of a railway vehicle with the auxiliary spring.
Background
The air spring is widely applied to the railway vehicle, is used as a main part of a secondary suspension system and is arranged between a vehicle body and a bogie, provides vertical support for the vehicle body, and has certain transverse and torsional deformation capacity.
The auxiliary spring is a key component part of the air spring, and the air bag and the auxiliary spring jointly act to provide support for the vehicle body in an inflated state; when the air spring is airless, only the auxiliary spring plays a supporting role.
The auxiliary springs are of several common types: flat auxiliary springs, conical auxiliary springs, hourglass auxiliary springs, conical and flat composite auxiliary springs. The vertical rigidity and the transverse rigidity of the composite auxiliary spring are smaller, and meanwhile, certain transverse deformation can be shared when the air spring is deformed transversely.
However, the air spring of the traditional compound auxiliary spring has complex structure, more parts and complex process: ① Two sets of dies are needed to vulcanize the conical auxiliary spring and the flat auxiliary spring respectively, two pieces of equipment are occupied during vulcanization, the vulcanization time is long, and the efficiency is low; ② Pairing is needed before routine test, and pairing numbers are recorded respectively; ③ Pre-assembling for routine testing; ④ After the test is finished, the conical auxiliary spring is required to be disassembled, and the conical auxiliary spring is processed to a set height according to the test result; ⑤ When the whole spring is assembled, the supporting seat and the conical auxiliary spring are assembled by bolts, and then the conical auxiliary spring and the flat auxiliary spring are assembled by groove pins according to the pre-assembled pairing number.
In addition, the load of the traditional auxiliary spring is mainly transferred through the central spindle, when the spindle is subjected to transverse deflection and torsion force, the torsion and deflection deformation is firstly driven to be performed on the rubber layer on one side of the spindle, and the coated rubber layer at the spindle is longer, so that the deformation capability of the auxiliary spring is limited.
Disclosure of Invention
Aiming at the defects existing in the related art, the invention provides an auxiliary spring and a rail vehicle air spring with the auxiliary spring, so as to solve the technical problems of complex structure, more parts, complex process and limited deformability of the traditional compound auxiliary spring.
In a first aspect, the present invention provides an auxiliary spring comprising: the connecting seat comprises a core shaft part and a connecting part which are integrated, and the connecting part surrounds the core shaft part; the conical auxiliary spring rubber body and the flat auxiliary spring rubber body are arranged around the mandrel part; the flat auxiliary spring rubber body is positioned below the conical auxiliary spring rubber body, and the connecting part is positioned between the conical auxiliary spring rubber body and the flat auxiliary spring rubber body; at least one glue injection hole is formed in the connecting portion, and the conical auxiliary spring rubber body and the flat auxiliary spring rubber body are integrally formed through the glue injection hole.
In some of these embodiments, the conical auxiliary spring rubber body is an inverted conical pile structure.
In some embodiments, the device further comprises a jacket surrounding the conical auxiliary spring rubber body.
In some embodiments, the spring assembly further comprises a bottom plate surrounding the mandrel portion, and the bottom plate is arranged below the flat auxiliary spring rubber body.
In some of these embodiments, the thickness of the bottom plate decreases gradually from the middle to the periphery.
In some of these embodiments, at least one spacer is disposed in the conical auxiliary spring rubber body.
In some of these embodiments, two spacers are provided in the conical auxiliary spring rubber body, which separate the conical auxiliary spring rubber body into three layers.
In some embodiments, the number of the glue injection holes is three, and the glue injection holes are uniformly distributed on the connecting portion.
In a second aspect, the present invention provides a rail vehicle air spring, including the auxiliary spring of the first aspect, further including: the supporting seat is arranged above the auxiliary spring and is abutted with the outer sleeve; the air bag is fixedly connected with the upper cover through a retaining ring and is in interference fit; the upper cover and the air bag after the fixed connection are clamped on the supporting seat and are in interference fit with the supporting seat.
In some embodiments, a friction block is mounted at the upper end of the supporting seat, and when the fixedly connected upper cover and the airbag are clamped on the supporting seat, the bottom end of the airbag is abutted against the friction block.
Based on the technical scheme, the invention provides the auxiliary spring and the railway vehicle air spring with the auxiliary spring, and the conical and flat plate combined auxiliary spring has the following advantages:
1. The inverted conical spring is adopted, and a special connecting seat structure is designed, so that integral vulcanization can be realized, and the demolding is convenient;
2. The traditional compound auxiliary spring needs to occupy two pieces of equipment, is vulcanized twice and has long production time; the three glue injection holes which are uniformly distributed are designed on the connecting seat, and the upper rubber body and the lower rubber body are communicated, so that the integrated auxiliary spring can realize integral one-time vulcanization, one-time molding and integrated structural design, and the process is simple and the efficiency is high;
3. The traditional compound auxiliary spring needs two sets of dies, two rubber formulas are required to be developed and vulcanized respectively, and the invention can only adopt one rubber formula, so that the process is easier to control during production, and the process stability is improved;
4. The integrated structure is tested without pairing and numbering recording, and is assembled by a slot pin, so that the re-assembly process is omitted after the test, and the assembly process is simplified; the components are few, the material cost is reduced, and the vulcanizing labor cost is saved;
5. Compared with the traditional conical and flat plate composite auxiliary spring, the auxiliary spring has simpler structure, obviously improved performance, and the smaller vertical rigidity of the auxiliary spring can provide better stability and comfort when the height of the air bag airless air spring is reduced, has small transverse rigidity, can share certain transverse deformation when the air spring is transversely deformed, and can effectively reduce the derailment coefficient of a vehicle, so that the vehicle is safer; in addition, due to the inverted cone pile structure, compared with the traditional auxiliary spring, the load transmission mode is changed from the central spindle transmission to circumferential jacket stress; when the outer sleeve is subjected to transverse deflection and torsion force, the rubber layer at the outer sleeve is driven to deform, and the rubber layer is shorter and is easier to twist and deflect, so that compared with a traditional composite auxiliary spring, the structure has better transverse deformation capability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a cross-sectional view of an assist spring according to the present invention;
FIG. 2 is a cross-sectional view of the air spring of the present invention;
In the figure:
11. A core shaft portion; 12. a connection part; 121. a glue injection hole; 13. a conical auxiliary spring rubber body; 131. a partition plate; 14. a flat auxiliary spring rubber body; 15. a jacket; 16. a bottom plate; 21. the supporting seat; 211. a friction block; 22. an air bag; 23. a clasp ring; 24. and (5) an upper cover.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "front", "rear", "top", "bottom", "inner", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "fixed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Currently, the auxiliary spring designs for rail vehicle air springs are of several common types: flat auxiliary springs, conical auxiliary springs, hourglass auxiliary springs, conical and flat composite auxiliary springs. The flat rubber pile auxiliary spring has high vertical rigidity, small transverse rigidity and good transverse deformation capability; the conical rubber pile auxiliary spring has smaller vertical rigidity, larger transverse rigidity and worst transverse deformability; the vertical rigidity and the transverse rigidity of the hourglass auxiliary spring are very small, and the instability phenomenon is easily caused by the too small transverse rigidity although the hourglass auxiliary spring has good deformability; the conical rubber pile and the flat rubber pile composite auxiliary spring can have the advantages of the flat pile and the conical pile (K2/(K1 + K2) according to the serial formula K=K1, when the gap between K1 and K2 is larger, the rigidity of the composite auxiliary spring after serial connection is closer to one with smaller rigidity, namely, the vertical rigidity is close to the conical pile, the transverse rigidity is close to the flat pile), the vertical rigidity and the transverse rigidity are smaller, and the composite auxiliary spring can have wider adjustment space and margin by controlling respective rigidity values and can be designed according to a required value. However, the load of the traditional auxiliary spring is mainly transferred through the central spindle, when the spindle is subjected to transverse deflection and torsion force, the torsion and deflection deformation is firstly driven by the rubber layer on one side of the spindle, and the coated rubber layer at the spindle is longer, so that the deformation capability of the traditional auxiliary spring is limited.
As shown in fig. 1, in the auxiliary spring of the present application, the auxiliary spring comprises a special connection seat structure, the connection seat comprises an integral spindle part and a connection part, the auxiliary spring also comprises an integrally formed conical auxiliary spring rubber body 13 and a planar auxiliary spring rubber body 14, both parts of the rubber body are arranged around the spindle part 11, specifically, the connection part 12 of the embodiment of the present application is arranged between the conical auxiliary spring rubber body 13 and the planar auxiliary spring rubber body 14, and in a specific implementation, three evenly arranged glue injection holes 121 are designed on the connection part 12, so that the upper and lower rubber bodies are communicated, and the conical auxiliary spring rubber body 13 and the planar auxiliary spring rubber body 14 of the auxiliary spring of the embodiment of the present application can realize integral one-step molding and integral structure design.
Further, an outer sleeve 15 is disposed around the conical auxiliary spring rubber body 13, and in a specific implementation, the conical auxiliary spring rubber body 13 is in an inverted conical pile structure, specifically, as shown in fig. 1, a main body portion of the outer sleeve 15 contacts with an upper portion of the conical auxiliary spring rubber body 13, that is, a colloid contacting with the outer sleeve 15 is shorter, and a colloid contacting with the mandrel portion 11 is longer, that is, an inverted conical pile structure is formed.
Based on the structure, the stiffness performance aspect of the auxiliary spring can reach the level of the traditional composite auxiliary spring, namely, the auxiliary spring has smaller vertical stiffness and lateral stiffness. Moreover, due to the inverted cone pile structure, compared with the traditional auxiliary spring, as shown in fig. 1, the load transmission mode is changed from the transmission of the central core shaft part 11 to the circumferential outer sleeve 15 stress; when the outer sleeve 15 is subjected to transverse deflection and torsion force, the rubber layer at the outer sleeve 15 is driven to deform, and the rubber layer is shorter, so that torsion and deflection are more easily generated. The structure of the present application has superior lateral deformability compared to the conventional compound assist spring.
Further, the bottom of the plate auxiliary spring rubber body 14 is further provided with a bottom plate 16 surrounding the mandrel portion 11, and the thickness of the plate auxiliary spring rubber body is gradually reduced from the middle to the periphery.
Further, two partition plates 131 are arranged in the conical auxiliary spring rubber body 13, and the partition plates 131 are arranged in the direction from inside to outside to divide the conical auxiliary spring rubber body 13 into three layers.
As shown in fig. 2, the auxiliary spring of the embodiment of the application is applied to the air spring, so that the air spring has a simpler structure, is not assembled by a groove pin, and does not need a pre-assembly and pairing process after the whole auxiliary spring is vulcanized once. The air spring comprises a supporting seat 21, a retaining ring 23, an air bag 22, an upper cover 24 and a friction block 211, in the specific implementation, the auxiliary spring is firstly placed forward, and then the supporting seat 21 is centered above the auxiliary spring and is abutted with the outer sleeve 15; the friction block 211 is fixed to the support base 21 using screws; the retaining ring 23 is mounted with the rubber bladder 22; the lower sub-opening of the air bag 22 is connected with the supporting seat 21 through knocking, the matching part of the air bag 22 and the supporting seat 21 is in interference fit, and the lower sealing performance of the air bag 22 is ensured through pressure self-sealing during inflation; finally, the retaining ring 23, the air bag 22 and the upper cover 24 are connected together through bolts, and the sealing is ensured through the interference fit formed by the air bag 22, the retaining ring 23 and the upper cover 24.
Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (9)
1. An assist spring, comprising:
the connecting seat comprises a core shaft part and a connecting part which are integrated, and the connecting part surrounds the core shaft part;
the conical auxiliary spring rubber body and the flat auxiliary spring rubber body are arranged around the mandrel part;
The flat auxiliary spring rubber body is positioned below the conical auxiliary spring rubber body, and the connecting part is positioned between the conical auxiliary spring rubber body and the flat auxiliary spring rubber body;
the connecting part is provided with at least one glue injection hole, the conical auxiliary spring rubber body and the flat auxiliary spring rubber body are integrally formed through the glue injection hole, and the two rubber bodies are both arranged around the mandrel part;
the bottom surface of the core shaft part is coplanar with the lower surface of the connecting part, and the upper surface of the connecting part is flush;
The auxiliary spring further comprises a jacket which surrounds the conical auxiliary spring rubber body.
2. The assist spring of claim 1 wherein said conical assist spring rubber body is an inverted conical stack structure.
3. The assist spring of claim 1 further comprising a bottom plate disposed around said spindle portion, said bottom plate disposed below said flat assist spring rubber body.
4. A secondary spring as claimed in claim 3, wherein the base plate has a thickness which tapers from the middle to the periphery.
5. The assist spring of claim 1 wherein said conical assist spring rubber body has at least one spacer disposed therein.
6. The auxiliary spring according to claim 5, wherein two separators are provided in the conical auxiliary spring rubber body, the separators dividing the conical auxiliary spring rubber body into three layers.
7. The auxiliary spring according to claim 1, wherein the glue injection holes are three and are uniformly distributed on the connecting portion.
8. A rail vehicle air spring comprising the auxiliary spring of any one of claims 1-7, further comprising:
the supporting seat is arranged above the auxiliary spring and is abutted with the outer sleeve;
The air bag is fixedly connected with the upper cover through a retaining ring and is in interference fit with the upper cover; the upper cover and the air bag after being fixedly connected are clamped on the supporting seat and are in interference fit with the supporting seat.
9. The air spring of claim 8, wherein a friction block is mounted at the upper end of the support seat, and the bottom end of the air bag abuts against the friction block when the fixedly connected upper cover and the air bag are clamped to the support seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058934.5A CN114382823B (en) | 2022-01-19 | 2022-01-19 | Auxiliary spring and air spring of railway vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058934.5A CN114382823B (en) | 2022-01-19 | 2022-01-19 | Auxiliary spring and air spring of railway vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114382823A CN114382823A (en) | 2022-04-22 |
| CN114382823B true CN114382823B (en) | 2024-06-21 |
Family
ID=81203824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210058934.5A Active CN114382823B (en) | 2022-01-19 | 2022-01-19 | Auxiliary spring and air spring of railway vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114382823B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2916252Y (en) * | 2006-06-27 | 2007-06-27 | 中国重型汽车集团有限公司 | Sliding rubber support assembly for balancing suspension of heavy duty car |
| WO2010010810A1 (en) * | 2008-07-24 | 2010-01-28 | 株式会社ブリヂストン | Air spring device |
| CN202468827U (en) * | 2012-03-19 | 2012-10-03 | 青岛思锐科技有限公司 | Air spring with large lateral displacement |
| CN205737565U (en) * | 2016-07-18 | 2016-11-30 | 株洲时代新材料科技股份有限公司 | Two is spring suspension device |
| CN112727987A (en) * | 2021-01-06 | 2021-04-30 | 青岛博锐智远减振科技有限公司 | Rubber pile, auxiliary spring and air spring system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5297602B2 (en) * | 2007-06-08 | 2013-09-25 | 東洋ゴム工業株式会社 | Railway vehicle suspension system |
| CN201437362U (en) * | 2009-07-06 | 2010-04-14 | 青岛四方车辆研究所有限公司 | Pneumatic spring for high-speed steering frame of motor train unit |
| CN103244593A (en) * | 2013-05-31 | 2013-08-14 | 安徽中鼎减震橡胶技术有限公司 | Bushing assembly of rear suspension system |
-
2022
- 2022-01-19 CN CN202210058934.5A patent/CN114382823B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2916252Y (en) * | 2006-06-27 | 2007-06-27 | 中国重型汽车集团有限公司 | Sliding rubber support assembly for balancing suspension of heavy duty car |
| WO2010010810A1 (en) * | 2008-07-24 | 2010-01-28 | 株式会社ブリヂストン | Air spring device |
| CN202468827U (en) * | 2012-03-19 | 2012-10-03 | 青岛思锐科技有限公司 | Air spring with large lateral displacement |
| CN205737565U (en) * | 2016-07-18 | 2016-11-30 | 株洲时代新材料科技股份有限公司 | Two is spring suspension device |
| CN112727987A (en) * | 2021-01-06 | 2021-04-30 | 青岛博锐智远减振科技有限公司 | Rubber pile, auxiliary spring and air spring system |
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| Publication number | Publication date |
|---|---|
| CN114382823A (en) | 2022-04-22 |
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