CN109812527A - One kind having second level rigidity flat spring light weight method and flat spring assembly - Google Patents
One kind having second level rigidity flat spring light weight method and flat spring assembly Download PDFInfo
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- CN109812527A CN109812527A CN201910102568.7A CN201910102568A CN109812527A CN 109812527 A CN109812527 A CN 109812527A CN 201910102568 A CN201910102568 A CN 201910102568A CN 109812527 A CN109812527 A CN 109812527A
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Abstract
The invention discloses a kind of light weight method and flat spring assembly with second level rigidity flat spring.Flat spring assembly includes main spring, rubber friction disc, damping rubber block, limit clip, nonmetallic backing plate, the composite material auxiliary spring being connected to below main spring, and damping rubber block is connected to composite material auxiliary spring both ends upper surface by bolt and adhesive；The main spring includes main spring steel leaf spring and the main spring composite material spring that is connected to below main spring steel leaf spring.With second level rigidity flat spring light weight method, add the structure of auxiliary spring using main spring, in main spring following settings auxiliary spring, main spring uses two-piece type metallic composite composite leaf spring, main spring composite material spring is connected below main spring steel leaf spring, auxiliary spring uses single piece composite material flat spring, so that realizing has the lightweight of second level rigidity flat spring.The present invention has obviously advantage compared with present automobile leaf spring, has higher riding comfort and 2 times or more longer service life.
Description
Technical field
The present invention relates to the production of auto parts and components and manufacturing technology fields.
Background technique
With the appearance of greenhouse effects and global energy crisis, automotive light weight technology undoubtedly become reduce greenhouse gas emission,
Reduce the important measures of energy consumption.Automobile leaf spring is with the invention of automobile and the development of automotive engineering, leaf spring material
Material and technology continue to develop, and tensile strength of material has reached 1300Mpa or more, and structure realizes steel from multiple-leaf spring to few leaf spring
The lightweight of flat spring, but the weight of steel plate spring assembly is still extremely heavy, has great loss of weight space, becomes domestic and international
The hot spot of person's research.It is the original low specific strength material of replacement as light-weighted important means, using specific strength and specific stiffness
Higher new material, polymer matrix composites are due to light-weight, specific strength is high, fatigue limit is high, anticorrosion, vibration damping drop
The advantages of making an uproar is come into being in automotive light weight technology manufacture.Polymer matrix composites are applied in spring for motor car, Neng Gouxian
Writing reduces weight, realizes the target of loss of weight consumption reduction.
The manipulation under the riding comfort under complete vehicle curb condition, ride performance and loaded vehicle state in order to balance of light passenger train and light truck
Stability, rear suspension leaf spring generally use the steel plate spring assembly with second level rigidity, as depicted in figs. 1 and 2.Fig. 1 is shown
A kind of rear plate spring assembly of light truck, main spring and auxiliary spring are made of three pieces steel leaf spring respectively, and auxiliary spring is on main spring.In zero load,
The weight of vehicle body is undertaken by main spring, and the rigidity of suspension is exactly the rigidity of main spring；When loaded vehicle, with the sinking of vehicle body, car body weight
By main spring and auxiliary spring shared, the rigidity of suspension is the sum of main spring and the rigidity of auxiliary spring.Fig. 2 show a kind of light passenger train's back plate
Spring assembly, main spring are made of three pieces leaf spring, and auxiliary spring is made of a piece of steel leaf spring, and auxiliary spring is below main spring, with automobile
The increase of loading capacity, the gap between main spring and auxiliary spring gradually become smaller, until a piece of two end in contact with auxiliary spring below main spring, at this moment
Major-minor spring carries jointly, and the rigidity of suspension is the sum of main auxiliary spring rigidity.
Existing composite material plate spring patent is essentially all that composite material plate spring is used as main spring, is only provided
Level-one rigidity cannot take into account the control stability under the ride performance and loaded vehicle state under complete vehicle curb condition.Single piece composite material
Leaf spring, as elastic element and director element, other than by vertical force, will also transmit the starting of automobile in light passenger train and light truck.System
Dynamic and lateral force and torque, due to composite fiber principal direction outside other direction intensity it is low, easily occur in use process
Lamination problem.
In the prior art, application No. is the invention of CN201610037227.2, to provide a kind of second level for leaf spring rigid
Leaf spring structure is spent, main reed is correspondingly provided with planar contact pair reed, and to screw is had on planar contact pair reed, screw is through flat
Face auxiliary spring piece is simultaneously fastened with nut, and screw and nut holds together planar contact pair reed, and the top cover of screw is equipped with spherical shape
Shape damping rubber block；Under the top cover of screw and plane auxiliary spring it is unilateral between be additionally provided with metallic framework, metallic framework and screw weldering
It is connected in one；Metallic framework extends to planar contact pair reed a side, and the side edge bending of planar contact pair reed is cooperated to have rib.Application
Number a kind of compound spring structures of offset frequencys such as variation rigidity are disclosed for the application for a patent for invention of CN201510005173.7, including main spring,
Auxiliary spring and buffer stopper, main spring both ends are bent upwards, its middle part is connect with auxiliary spring, and the both ends of auxiliary spring are arranged in buffer stopper.Application number
A kind of FRP composite material major-minor spring assembly, including FRP composite wood are disclosed for the application for a patent for invention of CN201710827997.1
Expect main spring ontology, preceding grasswort, preceding external bushing, preceding neck bush, front axle tube, upper cover plate, lower bolster, rear grasswort, rear external bushing, it is rear in
Bushing, rear axle tube, FRP composite material auxiliary spring ontology, central pin shaft and wearing plate.
Summary of the invention
It is an object of the present invention to provide a kind of light weight method and flat spring assembly with second level rigidity flat spring,
With better riding comfort and longer service life.
The technical scheme is that a kind of flat spring assembly, including main spring, the composite material pair being connected to below main spring
Spring, flat spring assembly further include damping rubber block, and damping rubber block is connected to composite material auxiliary spring both ends upper surface；The main spring
Including main spring steel leaf spring and the main spring composite material spring being connected to below main spring steel leaf spring.
Flat spring assembly further includes rubber friction disc；Rubber friction disc is connected to main spring composite wood by bolt and adhesive
Expect the upper surface at spring both ends.
Rubber friction disc is rubber-metal structure, and rubber friction disc includes rubber friction disc bottom plate and is connected to rubber friction
The abrasive rubber of piece substrate；Rubber friction disc is vulcanized by rubber friction disc bottom plate and abrasive rubber.
Damping rubber block is connected to composite material auxiliary spring both ends upper surface by bolt and adhesive；Damping rubber block uses
Rubber-metal structure, damping rubber block include damping rubber block bottom plate and the vibration damping rubber for being connected to damping rubber block substrate
Glue；Damping rubber block is vulcanized by damping rubber block bottom plate and vibration isolation rubber, and the longitudinal section and cross section of damping rubber block are equal
To be trapezoidal, the both ends of damping rubber block bottom plate in the longitudinal direction are equipped with upward flange；Damping rubber block is become using taper
Stiffness structure.
Composite material auxiliary spring is planar contact pair reed；Gap is remained between main spring and auxiliary spring.
Main spring both ends neighbouring position is mounted on limit clip.
Between main spring steel leaf spring and main spring composite material spring, between main spring composite material spring and composite material auxiliary spring, it is compound
Metal caul or nonmetallic backing plate are equipped with below material auxiliary spring；The position that metal caul is contacted with composite material auxiliary spring is respectively provided with
Long chamfering simultaneously vulcanizes at chamfering and is bonded elastic material.
Main spring steel leaf spring is made using high-strength spring steel by heat treatment and surface stress ball blast；Main spring composite wood
Material spring and composite material auxiliary spring are all made of glass or carbon fiber enhancing/epoxy resin composite material, are molded by prepreg overlay
Type；Main spring composite material spring and composite material auxiliary spring are all made of the wide iso-stress structure to thicken or cross-section is long-pending.
One kind having second level rigidity flat spring light weight method, adds the knot of auxiliary spring using main spring with second level rigidity flat spring
Structure cancels the components that body frame stringer contacts friction with auxiliary spring in main spring following settings auxiliary spring, and main spring uses two-piece type metal
Composite material composite leaf spring, connects main spring composite material spring below main spring steel leaf spring, and auxiliary spring uses single piece composite material plate
Spring, so that realizing has the lightweight of second level rigidity flat spring.
Lightweight with second level rigidity flat spring is realized using above-mentioned flat spring assembly；Main spring steel leaf spring is born up
Dynamic, braking and lateral force and torque, main spring composite material spring bear vertical force, thus when preventing composite material from bearing multi-load
It is layered；
Damping rubber block is set in auxiliary spring both ends upper surface, damping rubber block uses taper stiffness changing structure, to realize plate bullet
The gentle transition of spring assembly two stage stiffness, the contact stress for cutting down main spring and auxiliary spring contact position, and pass through vibration isolation rubber and shear
The relative displacement between main spring and auxiliary spring is realized in deformation；
Rubber friction disc is set between main spring steel leaf spring and main spring composite material spring, transmits main spring steel leaf spring and main spring composite wood
Vertical force, the main spring steel leaf spring of elimination between material spring and the noise generated when friction between main spring composite material spring, and by resistance to
The shear-deformable relative displacement realized between main spring steel leaf spring and main spring composite material spring of rubber milling；
The present invention has obviously advantage compared with present automobile leaf spring, has higher riding comfort and 2
Times or more the longer service life.Compared to all-metal major-minor formula leaf spring, the main spring in the present invention uses two-piece type metallic composite
Composite leaf spring, auxiliary spring use single piece composite material flat spring, realize the lightweight of product.Compared to single piece composite material master
Spring, main spring first in the present invention uses leaf spring, is primarily subjected to start, braking and lateral force and torque, second multiple
Condensation material flat spring is primarily subjected to vertical force, solves the problems, such as that composite material bears multi-load and has been layered.Compared to
Light truck major-minor spring leaf spring, the present invention in auxiliary spring be located at below main spring, eliminate body frame stringer contacted with auxiliary spring rub
Components simplify body frame longitudinal beam structure.Compared to light passenger train's major-minor spring leaf spring, the auxiliary spring both ends upper surface in the present invention is equipped with
Damping rubber block, damping rubber block use taper stiffness changing structure, the transition position of flat spring assembly two stage stiffness just than more gentle,
The contact stress of main spring and auxiliary spring contact position is cut down.Compared to all-metal major-minor formula leaf spring, in the present invention, in first steel
Rubber friction disc is equipped between the main spring of plate and second main spring of composite material, rubber friction disc transmits vertical between the main spring of two panels
Power simultaneously eliminates the noise generated when rubbing between the main spring of two panels.
Detailed description of the invention
Fig. 1 is light truck plate spring suspension structure figure in the prior art；
Fig. 2 is light passenger train's plate spring suspension structure figure in the prior art；
Fig. 3 a is flat spring assembly (free state) structural schematic diagram in the present invention；
Fig. 3 b is flat spring assembly (flat) structural schematic diagram in the present invention；
Fig. 4 is the rubber friction disc structural schematic diagram in the present invention；
Fig. 5 is the damping rubber block structural schematic diagram and its deformation curve in the present invention；
Fig. 6 is the second level load displacement curve figure in the present invention；
In figure: 1. main spring steel leaf springs, 2. main spring composite material springs, 3. composite material auxiliary springs, 4. damping rubber blocks, 5.
Limit clip, 6. rubber friction discs, 41. damping rubber block bottom plates, 42. vibration isolation rubbers, 61. rubber friction disc bottom plates,
62. abrasive rubber.
Specific embodiment
With reference to the accompanying drawings, the invention will be further described in conjunction with specific embodiments.
As shown in Fig. 3 a, Fig. 3 b, Fig. 4, Fig. 5, a kind of flat spring assembly, including main first steel plate of spring of main spring steel leaf spring 1(
Spring), main second composite material plate spring of spring of main spring composite material spring 2(), composite material auxiliary spring 3, damping rubber block 4, limit
Position clip 5(fiber clip) and rubber friction disc 6.Damping rubber block includes damping rubber block bottom plate 41, vibration isolation rubber 42；Rubber
Friction plate includes rubber friction disc bottom plate 61, abrasive rubber 62.In three pieces leaf spring, (main spring steel leaf spring, is answered at main spring composite material spring
Condensation material auxiliary spring) in arbitrary neighborhood two panels leaf spring between and composite material auxiliary spring below medium position be mounted on special system
During the metal of work or nonmetallic backing plate (including middle part backing plate one, middle part backing plate two and middle part backing plate three), backing plate and leaf spring pass through
Heart screw bolt and nut links together.Middle part backing plate one is installed, main spring is compound between main spring steel leaf spring, main spring composite material spring
Middle part backing plate two is installed, auxiliary spring lower middle part position is equipped with middle part backing plate three between material spring and composite material auxiliary spring.Rubber
Glue friction plate is connected to the upper surface at second composite material plate spring both ends by bolt and adhesive.Damping rubber block passes through
Bolt and adhesive are connected to composite material auxiliary spring both ends upper surface.By centre bolt and nut three pieces leaf spring in the middle part of leaf spring
It is attached with the backing plate at middle part: from top to bottom main spring steel leaf spring, middle part backing plate one, main spring composite material spring, middle part backing plate
Two, composite material auxiliary spring and middle part backing plate three are attached.Nonmetallic backing plate requires to use fibre reinforced materials, and guarantee has enough
Strength and stiffness.
As shown in Figure 3a, flat spring assembly is in free state, main spring (including main spring steel leaf spring and main spring composite material
Spring) and auxiliary spring (composite material auxiliary spring) among be equipped with certain gap, only main spring carrying in the unloaded state, flat spring assembly
Rigidity is first order rigidity, it is ensured that the riding comfort of ride of vehicle and driver under complete vehicle curb condition.With
Load-carrying or the increase of passenger, the gap between major-minor spring are gradually reduced until eliminating, and reach full load in automobile, major-minor spring is all
Comprehensive engagement, as shown in Figure 3b, flat spring assembly rigidity are second level rigidity.
As shown in Fig. 3 a, Fig. 3 b, Fig. 5 and Fig. 6, damping rubber block by damping rubber block bottom plate and vibration isolation rubber vulcanization and
At being connected to the upper surface at auxiliary spring both ends by bolt and nut and adhesive.The longitudinal and transverse section of damping rubber block be it is trapezoidal,
Both ends carry out flange to damping rubber block bottom plate in the longitudinal direction, and flange limits the deformation of vibration isolation rubber in the longitudinal direction,
Damping rubber block stiffness variation is in non-linear, last rigidity infinity.Damping rubber block effectively mitigates the unexpected change of two stage stiffness
Change, and by the shear-deformable relative displacement realized between major-minor spring, and substantially improves answering for main spring and auxiliary spring contact position
Power is concentrated, and the service life of product is improved.
As shown in Fig. 3 a, Fig. 3 b and Fig. 4, rubber friction disc is vulcanized by rubber friction disc bottom plate and abrasive rubber, is led to
Cross the upper surface that bolt, nut and adhesive are connected to second composite material plate spring both ends.Rubber friction disc is mainly eliminated
The noise generated when rubbing between the main spring of two panels.Rubber friction disc is rubber-metal structure, realizes two by the way that rubber is shear-deformable
Relative displacement between the main spring of piece.
Leaf spring (main spring steel leaf spring) uses high-strength spring steel, improves steel plate by heat treatment and surface stress ball blast
The intensity of spring.Two panels composite material plate spring is using glass (or carbon fiber) enhancing/epoxy resin composite material production, by pre-
Leaching material laying compression molding, composite fiber laying are generally 0 degree, are needed according to intensity to small part laying use ± 45 degree
Or 90 degree of progress reinforcement, reinforcing fiber volume content range are 50%-70%.Composite material plate spring using it is wide thicken or wait cut
The iso-stress structure-design technique of area.Between three pieces leaf spring and auxiliary spring is installed below nonmetallic backing plate (middle part backing plate) and is required to
Special facture, nonmetallic backing plate will have enough intensity to guarantee elasticity appropriate again, in metal caul and composite panel
The position of spring contact is arranged long chamfering and vulcanizes at chamfering and be bonded elastic material, and the elasticity of middle part backing plate can reduce and disappear
Contact stress after being fixed except U-bolt and in flat spring assembly load bearing process, at metal and composite material contact position.
The present invention advantage high using fibre reinforced composites specific strength and specific stiffness, is meeting automobile leaf spring
On the basis of capable of requiring, the light weight method and flat spring assembly of a kind of second level rigidity flat spring are provided.Composite material plate spring
Certain damping can be provided, the failure of composite material plate spring is a slow process, has higher riding comfort and 2 times
The above longer service life.Main spring be two-piece type metal and the compound leaf spring of composite material, the piece of metal leaf spring with grasswort above,
The starting of main transmitting automobile.Braking and lateral force and torque, undertake least a portion of vertical load；Second is fiber reinforcement
Composite material plate spring undertakes main vertical load.Auxiliary spring be located at main spring in the following, and have gap appropriate therebetween, mention
For the second level rigidity of flat spring assembly, auxiliary spring also uses fiber-reinforced composite material board spring.The installation of auxiliary spring both ends upper surface is each
One damping rubber block is installed, damping rubber block uses rubber and metal structure, and damping rubber block uses taper stiffness changing structure,
In this way in the transition position of flat spring assembly two stage stiffness just than more gentle, realization flat spring assembly two stage stiffness transition is gentle, rubber
Glue buffer stopper also eliminates the contact stress of main spring and auxiliary spring contact position.Main spring second undertakes most of vertical load, by
There is certain damping in fibre reinforced composites, vibration can be alleviated, ride of vehicle is improved and improve
The service life of entire flat spring assembly.
Compared with prior art, main spring of the invention is the composite construction of metal and composite material plate spring, and auxiliary spring is set
The composite material switch jaw contact for setting the Shi Yuzhu spring that works in leaf spring extrados, realizes two stage stiffness.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., is all included in the scope of protection of the present invention.
Claims (10)
1. a kind of flat spring assembly, including main spring, the composite material auxiliary spring being connected to below main spring, characterized in that flat spring is total
At further including damping rubber block, damping rubber block is connected to composite material auxiliary spring both ends upper surface；The main spring includes main spring steel
Leaf spring and the main spring composite material spring being connected to below main spring steel leaf spring.
2. flat spring assembly according to claim 1, characterized in that flat spring assembly further includes rubber friction disc；Rubber
Friction plate is connected to the upper surface at main spring composite material spring both ends by bolt and adhesive.
3. flat spring assembly according to claim 2, characterized in that rubber friction disc is rubber-metal structure, and rubber rubs
Pad includes rubber friction disc bottom plate and the abrasive rubber for being connected to rubber friction disc substrate；Rubber friction disc is rubbed by rubber
Pad bottom plate and abrasive rubber vulcanize.
4. flat spring assembly according to claim 1, characterized in that damping rubber block is connected to by bolt and adhesive
Composite material auxiliary spring both ends upper surface；Damping rubber block uses rubber-metal structure, and damping rubber block includes damping rubber block bottom
Plate and the vibration isolation rubber for being connected to damping rubber block substrate；Damping rubber block is by damping rubber block bottom plate and vibration isolation rubber sulphur
Change, the longitudinal section and cross section of damping rubber block be it is trapezoidal, the both ends of damping rubber block bottom plate in the longitudinal direction are equal
Equipped with upward flange；Damping rubber block uses taper stiffness changing structure.
5. flat spring assembly according to claim 1, characterized in that composite material auxiliary spring is planar contact pair reed；Main spring and
Gap is remained between auxiliary spring.
6. flat spring assembly according to claim 1, characterized in that main spring both ends neighbouring position is mounted on limiting card
Hoop.
7. flat spring assembly according to claim 1, characterized in that between main spring steel leaf spring and main spring composite material spring,
Metal caul or nonmetallic backing plate are equipped between main spring composite material spring and composite material auxiliary spring, below composite material auxiliary spring；
The position that metal caul is contacted with composite material auxiliary spring is respectively provided with long chamfering and vulcanizes and be bonded elastic material at chamfering.
8. flat spring assembly according to claim 1, characterized in that main spring steel leaf spring passes through heat using high-strength spring steel
Processing and surface stress ball blast are made；Main spring composite material spring and composite material auxiliary spring be all made of glass or carbon fiber enhancing/
Epoxy resin composite material is pressed and molded by prepreg overlay；Main spring composite material spring and composite material auxiliary spring are all made of
Width thickens or the iso-stress structure of cross-section product.
9. one kind has second level rigidity flat spring light weight method, characterized in that have second level rigidity flat spring to add using main spring
The structure of auxiliary spring cancels the components that body frame stringer contacts friction with auxiliary spring in main spring following settings auxiliary spring, and main spring uses two
Sheet metal composite material composite leaf spring, connects main spring composite material spring below main spring steel leaf spring, and auxiliary spring is multiple using monolithic
Condensation material flat spring, so that realizing has the lightweight of second level rigidity flat spring.
10. according to claim 9 have second level rigidity flat spring light weight method, characterized in that use claim 1
The flat spring assembly realizes the lightweight with second level rigidity flat spring；Main spring steel leaf spring bears starting, braking and side
To power and torque, main spring composite material spring bears vertical force, so that composite material be prevented to be layered when bearing multi-load；
Damping rubber block is set in auxiliary spring both ends upper surface, damping rubber block uses taper stiffness changing structure, to realize plate bullet
The gentle transition of spring assembly two stage stiffness, the contact stress for cutting down main spring and auxiliary spring contact position, and pass through vibration isolation rubber and shear
The relative displacement between main spring and auxiliary spring is realized in deformation；
Rubber friction disc is set between main spring steel leaf spring and main spring composite material spring, transmits main spring steel leaf spring and main spring composite wood
Vertical force, the main spring steel leaf spring of elimination between material spring and the noise generated when friction between main spring composite material spring, and by resistance to
The shear-deformable relative displacement realized between main spring steel leaf spring and main spring composite material spring of rubber milling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102568.7A CN109812527A (en) | 2019-02-01 | 2019-02-01 | One kind having second level rigidity flat spring light weight method and flat spring assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102568.7A CN109812527A (en) | 2019-02-01 | 2019-02-01 | One kind having second level rigidity flat spring light weight method and flat spring assembly |
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| CN201910102568.7A Pending CN109812527A (en) | 2019-02-01 | 2019-02-01 | One kind having second level rigidity flat spring light weight method and flat spring assembly |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285170A (en) * | 2019-06-28 | 2019-09-27 | 江西远成汽车技术股份有限公司 | A kind of leaf spring with damping limit |
| CN110388400A (en) * | 2019-07-08 | 2019-10-29 | 徐州工程学院 | A kind of flat spring and its vibration isolation and damping method based on marmem |
| CN111692243A (en) * | 2020-06-24 | 2020-09-22 | 徐州徐工矿业机械有限公司 | Multi-piston wet brake of electric drive mining dump truck |
| CN112026825A (en) * | 2020-09-25 | 2020-12-04 | 中车长春轨道客车股份有限公司 | Composite plate spring structure for primary suspension system of railway vehicle |
| CN110247132B (en) * | 2019-06-12 | 2021-04-27 | 安徽江淮松芝空调有限公司 | Power battery direct cooling system with plate spring |
| CN113059974A (en) * | 2020-01-02 | 2021-07-02 | 株洲时代新材料科技股份有限公司 | Composite plate spring protection device |
| CN113059973A (en) * | 2020-01-02 | 2021-07-02 | 博戈橡胶塑料（株洲）有限公司 | Combined suspension device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247132B (en) * | 2019-06-12 | 2021-04-27 | 安徽江淮松芝空调有限公司 | Power battery direct cooling system with plate spring |
| CN110285170A (en) * | 2019-06-28 | 2019-09-27 | 江西远成汽车技术股份有限公司 | A kind of leaf spring with damping limit |
| CN110388400A (en) * | 2019-07-08 | 2019-10-29 | 徐州工程学院 | A kind of flat spring and its vibration isolation and damping method based on marmem |
| CN113059974A (en) * | 2020-01-02 | 2021-07-02 | 株洲时代新材料科技股份有限公司 | Composite plate spring protection device |
| CN113059973A (en) * | 2020-01-02 | 2021-07-02 | 博戈橡胶塑料（株洲）有限公司 | Combined suspension device |
| CN111692243A (en) * | 2020-06-24 | 2020-09-22 | 徐州徐工矿业机械有限公司 | Multi-piston wet brake of electric drive mining dump truck |
| CN111692243B (en) * | 2020-06-24 | 2021-12-21 | 徐州徐工矿业机械有限公司 | Multi-piston wet brake of electric drive mining dump truck |
| CN112026825A (en) * | 2020-09-25 | 2020-12-04 | 中车长春轨道客车股份有限公司 | Composite plate spring structure for primary suspension system of railway vehicle |
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Application publication date: 20190528 |