CN107264559A - Curb girder and the track train with the curb girder - Google Patents
Curb girder and the track train with the curb girder Download PDFInfo
- Publication number
- CN107264559A CN107264559A CN201610210989.8A CN201610210989A CN107264559A CN 107264559 A CN107264559 A CN 107264559A CN 201610210989 A CN201610210989 A CN 201610210989A CN 107264559 A CN107264559 A CN 107264559A
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- Prior art keywords
- curb girder
- backing plate
- plate
- guide pillar
- flat board
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
- B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
- B61F5/307—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating fluid springs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The present invention discloses a kind of curb girder, and the curb girder can be used for carrying air spring, and the curb girder upper surface is fixedly installed the backing plate for installing the air spring, and the backing plate has the upper surface obtained by machining.The curb girder is provided with the guide pillar being adapted to the air spring, and the top of the guide pillar is concordant with the upper surface of the curb girder；The through hole connected with the guide pillar is offered in the middle part of the backing plate, and the backing plate covers the seam crossing between the guide pillar and the upper surface of the curb girder.It is so designed that, backing plate one can make it that air spring installation site is smooth, it is ensured that installation quality, while reducing the pressure of air spring offside top surface of the beam；Two come the thickness by adjusting backing plate, it is ensured that the distance of backing plate upper surface to rail level is consistent, ensures that car body is in the state of relative level with this.On this basis, the present invention also provides a kind of track train with the curb girder.
Description
Technical field
The present invention relates to rail vehicle truck technical field of structures, more particularly to a kind of curb girder.
Background technology
Bogie is divided into power truck and trailer bogie, and it is most heavy in rail vehicle system
Whether one of building block wanted, its structure design rationally directly affects the riding quality of vehicle,
Power performance and security performance.
The bogie that we design for this must meet following requirement：
Carrying：Bear the weight of bogie above various pieces；
It is oriented to：Orbit with ensureing vehicle safety；
Buffering：Relax impact of the guideway irregularity to vehicle, it is ensured that vehicle has good operation
Stationarity：
Draw (power truck)：Ensure that necessary track sticks together, and production at rail contact
Raw tractive effort at wheel rim passes to car body；
Braking：Produce necessary brake force so that vehicle slows down or stopped in predetermined distance.
In bogie, one system suspension arrangement is its important component, single stage suspension again
Device is arranged between axle box and framework, and its main function is to relax guideway irregularity to vehicle
Impact, it is ensured that operation stability and stationarity, and make when ensureing vehicle by curve wheel to return
Turn flexible.
Single stage suspension device is, primary spring seat carrying fixed architecturally by primary spring seat
Compared with big load, primary spring seat of the prior art is made of bending steel plate welding, technique
Poor-performing, the degree of modularity is relatively low, and workman's operating efficiency is also low.
At the same time, influence of the weld seam to size is very big in the welding process of framework, easily makes
It is highly inconsistent into the left and right of framework, it need ask and be ensured by processing, so as to reduce one
It is the intensity of spring base.
The content of the invention
In order to solve the above technical problems, the purpose of the present invention is offer curb girder and applies this curb girder
Track train, mainly improving primary spring seat performance, improving framework left and right sides symmetry
On be made that optimization.
A kind of curb girder, the curb girder can be used for carrying air spring, and the curb girder upper surface is fixed
The backing plate for installing the air spring is provided with, the backing plate has to be obtained by machining
The upper surface obtained.
Preferably, the curb girder is provided with the guide pillar being adapted to the air spring, the guide pillar
Top it is concordant with the upper surface of the curb girder；
The through hole connected with the guide pillar is offered in the middle part of the backing plate, and the backing plate covers
The seam crossing covered between the upper surface of the guide pillar and the curb girder.
Preferably, the backing plate is circle.
Preferably, the lower surface at the curb girder two ends is fixedly installed primary spring seat, institute respectively
It is casting to state primary spring seat.
Preferably, the top of the primary spring seat is a flat board, and the flat board is along its length
The side in direction, smoothly extension forms one piece of bent plate downwards；
Be a casing in the lower section of the bent plate, the bottom of the casing is lower cover, it is described under
Cover plate extends to both sides respectively along its width；The centre of the lower cover is offered
Mounting hole, the week side of boss of the lower cover offers the through hole for connecting single stage suspension；
The opposite side of the flat board be installing plate, the installing plate along its width respectively to
Both sides extend；The through hole for connecting single stage suspension is offered in the week side of boss of the installing plate.
Preferably, the lower cover is in the length phase extended respectively to both sides along its width
Together.
Preferably, the length that the installing plate extends to both sides respectively along its width is identical.
Preferably, the thickness of the installing plate is more than the thickness of the flat board.
Preferably, the top of the installing plate is concordant with the flat board, the bottom of the installing plate
Protrude from the flat board.
Present invention also provides a kind of track train, including the bogie with curb girder, the side
Beam is any described curb girder in the application.
Due to using above-mentioned technical proposal, the application has the following advantages that：
Compared with prior art, pad is added between air spring and curb girder of this programme on curb girder
Plate, is arranged such, and the dimensional accuracy of backing plate upper surface is effectively controlled after machining, and one
Aspect may insure that air spring installation site is smooth, it is ensured that installation quality, while reducing sky
The local pressure of gas spring offside top surface of the beam, local pressure is uniform and then make it that air-tightness is had
Effect lifting；In addition, the thickness by adjusting backing plate, it is ensured that rail level is arrived in backing plate upper surface
Distance is consistent, ensures that car body is in the state of relative level with this.
In the preferred scheme of the present invention, backing plate is covered in air spring guide pillar and curb girder upper surface
Between seam crossing, after the completion of being welded and fixed, further increase at curb girder air spring seat
Bearing capacity.
In another preferred scheme of the present invention, primary spring seat is set to casting, with
Existing primary spring seat is using flat plate buckling into comparing by the way of required shape, and this programme can be complete
The possibility of underbead crack can be produced by evading in process, be lifted to greatest extent safe and reliable
Property；In addition, casting stability is preferably, and dimensional accuracy is controlled well, can reduce stress concentration production
Raw defect.
In the another preferred scheme of the present invention, the top of primary spring seat is a flat board, institute
The side along its length direction of flat board is stated, is smoothly extended downwards, one piece of bent plate is formed.
The smooth transition portion of primary spring seat can preferably transmit power, decompose high-stress area, should
Power farthest reduces, while primary spring seat is made of casting, it is to avoid produced during bending
Raw Metal Crack.
Brief description of the drawings
Fig. 1 is the primary spring seat first angle dimensional structure diagram of the present invention；
Fig. 2 is the primary spring seat second angle dimensional structure diagram of the present invention；
Fig. 3 is that the curb girder of the present invention and primary spring coordinate first angle dimensional structure diagram；
Fig. 4 is that the curb girder of the present invention and primary spring coordinate second angle dimensional structure diagram；
Fig. 5 is the framework assembling side structure schematic view of the present invention；
Fig. 6 is the curb girder and beam engagement configuration schematic diagram of the present invention；
Fig. 7 is the curb girder and beam engagement structural representation of the present invention；
Fig. 8 is the drawing pull bar connecting seat and drawing pull bar fit structure schematic diagram of the present invention；
Fig. 9 is A portions partial enlargement structural representation in Fig. 8；
Figure 10 is the drawing pull bar connecting seat first angle structural representation of the present invention；
Figure 11 is the drawing pull bar connecting seat second angle structural representation of the present invention.
In figure：
1st, lower cover；2nd, bent plate；3rd, flat board；4th, installing plate；5th, through hole；6th, install
Hole；7th, casing；8th, air spring；9th, backing plate；10th, curb girder；10.1st, curb girder inner vertical plate；
10.2nd, curb girder outer vertical plate；11st, primary spring；12nd, primary spring seat；13rd, riser；13.1、
First riser；13.2nd, the second riser；13.3, small vertical plate；14th, crossbeam；15th, slope is docked
Mouthful；16th, transition seat；17th, upper cover plate；18th, lower cover；19th, rail level；20th, traction is drawn
Bar connecting seat；21st, drawing pull bar；22nd, draw beam；23rd, crossbeam connecting portion；24th, draw
Draw rod attachment part；25th, connecting hole；27th, through hole；28th, crossbeam connecting seat.
Embodiment
In order that those skilled in the art more fully understands technical scheme, tie below
Closing the drawings and specific embodiments, the present invention is described in further detail.
In one embodiment in this application, as shown in Figure 3,4, illustrate in figure 3
The schematic perspective view of curb girder 10, illustrate in Fig. 4 curb girder 10 another angle it is vertical
Body structural representation.A kind of curb girder 10 in the application, the top of curb girder 10 is used for carrying sky
Gas spring 8, is fixedly installed backing plate 9 between curb girder 10 and air spring 8, backing plate 9 it is upper
Surface is made using machining, and this backing plate 9 preferably has circle, but should not be limited to this shape.
Wherein for the addition of backing plate 9, there is following good effect：Air bullet on curb girder 10
Backing plate 9 is added between spring 8 and curb girder 10.Because the area of upper cover plate 17 of curb girder 10 is big, together
When subsequent technique in also have weld the step for, in process easily cause punching shear,
The reduction of flatness is caused, while weld seam can also cause the height above left and right curb girder 10 to differ
Cause, ultimately result in after compartment is installed it cannot be guaranteed that car body left and right sides height inconsistent.For this I
Add backing plate 9 herein, backing plate 9 one can make it that the installation site of air spring 8 is smooth,
Ensure installation quality, while reducing pressure of the air spring 8 to the top surface of curb girder 10；Two lead to
Cross the thickness of adjustment backing plate 9, it is ensured that the distance of the upper surface of backing plate 9 to rail level 19 is consistent,
Ensure that car body is in the state of relative level with this.
As shown in Figure 3,4, the guide pillar 26 being adapted to air spring 8 is inserted with curb girder 10,
The top of guide pillar 26 is concordant with the upper surface of curb girder 10；The middle part of backing plate 9 is offered and guide pillar
Between the through hole 27 of 26 connections, and the covering guide pillar 26 of backing plate 9 and the upper surface of curb girder 10
Seam crossing, backing plate 9 can cover seam crossing, improve rate of pressurization, in order to avoid so that dust steam
Into internal cavity, corrosion is caused.
In the application another embodiment, further optimize on the basis of said structure
The structure of primary spring seat 12, as shown in figure 1, illustrating primary spring seat 12 in Fig. 1
An angle stereogram, in figure we can see that primary spring seat 12 overall shape
State.The top of primary spring seat 12 is a flat board 3, flat board 3 along the one of its length direction
Side, smoothly extension forms one piece of bent plate 2 downwards；It is a casing 7, case in the lower section of bent plate 2
The bottom of body 7 is lower cover 1, and lower cover 1 extends to both sides respectively along its width；
The centre of lower cover 1 offers mounting hole 6, and the week side of boss of lower cover 1 is offered for connecting
Connect the through hole 5 of single stage suspension；The opposite side of flat board is installing plate 4, installing plate 4 it is wide along it
Degree direction extends to both sides respectively；Offered in the week side of boss of installing plate 4 for connecting single stage suspension
Through hole 5, and provided with mounting hole；Installing plate 4 extends to both sides respectively along its width
Development length is identical.
Formed because primary spring seat 12 is integrated casting, its top surface relative smooth, in weldering
When connecing, two ends of curb girder 10 are welded to, the bottom surface of primary spring seat 12 is provided with
Two installation sites, for installing primary spring 11, during installation, by primary spring 11 and one
It is that the mounting hole 6 and through hole 5 reserved on spring base 12 are aligned, is then fastened by bolts.
As the supplement to Fig. 1, as shown in Fig. 2 to illustrate primary spring seat 12 another by Fig. 2
The schematic perspective view of an outer angle, in this figure we can clearly find out, primary spring
The top surface of seat 12 is seamlessly transitted, such a transmission being provided with beneficial to load, while can also be clear
Clear finds out that installing plate 4 is concordant with the top of flat board 3, and such setting reduces ramp, main
If in order to preferably be welded with curb girder 10, reducing the thickness of weld seam, increase intensity.Together
When installing plate 4 thickness be preferably capable of thickness more than flat board 3, due to installing plate 4 it is long when
Between receive huge pressure effect, the raising and the impact resistance that are designed with beneficial to intensity of thickening
Improve.
As shown in figure 5, Fig. 5 is bogie side structure schematic view, we can understand wherein
See, backing plate 9 arrive rail level 19 between position relationship, the main function of backing plate 9 is exactly to adjust
The top surface of backing plate 9 is the distance between to cabinet face so that the air spring 8 on the curb girder 10 of the left and right sides
It is highly consistent, ensure that compartment is more smoothly operated on rail level 19 with this.
The bogie that also proposed in the application in a kind of track train, such a track train includes
Curb girder 10, above-mentioned technical proposal is constituted such a curb girder 10 again, applies the car body of such a curb girder 10
More existing car body compartment smoothness is more preferable, while 12 stress of primary spring seat in bogie are more
Uniformly, rigidity is more balanced.
As shown in fig. 6, on the basis of above-described embodiment, we are also to curb girder 10 and crossbeam 14
Between the part of connection be optimized, in the prior art, the connection of crossbeam 14 and curb girder 10
Relation is, by perforate on the left and right directions in Figure 5 of curb girder 10, crossbeam 14 then to be inserted into it
In, it is fixed using the mode of welding machine, such a mode defect is extremely obvious, by high-stress area
Concentrate in welded joints, it is well known that the intensity of weld seam is less than mother metal, because such a design method
The existing defects on bulk strength, while when whole device works, the interior plate of curb girder 10 is also
The power of a bending can be received so that the stress on curb girder 10 is increased, and accelerates the strain of metal.
In order to solve the above-mentioned technical problem we have proposed following technical scheme：
The inner side of curb girder 10 is provided with the crossbeam connecting seat 28 available for connecting cross beam 14, and crossbeam connects
Joint chair 28 includes the first riser 13.1, the second riser 13.2 and the mistake for fixing the crossbeam 14
Cross seat 16；First riser 13.1 and the second riser 13.2 it is relative to each other be fixedly installed on the side
Between the upper cover plate 17 and lower cover 18 of beam 10；The upper cover plate 17 and lower cover 18 of curb girder 10 and
One riser 13.1, the second riser 13.2 and the formation closing chamber of transition seat 16.Typically we use weldering
Connect this mode to be fixed, but be not limited to such a form.
As the further optimization to the above-mentioned connected mode of crossbeam 14, we are by the first riser 13.1
It is set to two pieces of small vertical plates 13.3, thickness side of two pieces of small vertical plates 13.3 along the curb girder 10
To arranging at grade, during welding, first by the second riser 13.2 and curb girder
The small vertical plate 13.3 of one of them, is then welded on inside curb girder 10 by 10 welding, and this block is small vertical
The top margin of plate 13.3 is welded with upper cover plate 17, and base is welded with lower cover 18, side and curb girder 10
Inner panel welding, then again welding transition seat 16, define one opening casing 7, lead to
Crossing at opening can weld to inside, form welding by both sides, intensity is improved with this, finally
Remaining one piece of small vertical plate 13.3 is welded at last opening, welding installs crossbeam after terminating
14, crossbeam 14 is welded with transition seat 16.
There are the following problems between crossbeam 14 and transition seat 16, because crossbeam 14 is tubulose,
It is this we in forging transition seat 16 during welding, it is difficult to be welded on the center of transition seat 16
When, a butting grooves 15 are together processed thereon, while being aided with weld jig.This structure
Facilitate the center that crossbeam 14 is accurately welded to transition seat 16 so that integral device is more
It is stable.
Schematic diagram when we illustrate crossbeam 14 with the assembling of curb girder 10 from top in the figure 7, from
We can be clearly seen that 13.1 points of the first riser is two pieces of small vertical plates 13.3 in figure.
The characteristics of a kind of track train, such a track train are proposed in the application is, in car body
The curb girder 10 described in text is applied in bogie, is in the junction of crossbeam 14 of curb girder 10, one
Spring base 12 and the junction of air spring 8 are optimized, and are that this such a track train has more
Stable the characteristics of.
More optimize in detail as to above-mentioned embodiment, we also draw in crossbeam 14 with traction
The place of bar 21 has carried out more deep optimization.
Middle part is provided with to be provided with draw beam 22, draw beam 22 and led in framework in the prior art
Be pulled bar 21, and drawing pull bar 21 is fixedly connected with crossbeam 14, in drawing pull bar 21 and crossbeam 14
Junction is one piece of one piece of plate body arranged along the length direction of crossbeam 14, is offered on plate body
Hole, for being installed with draw beam 22, the defect of such a design is, when drawing pull bar 21
When being exerted a force to this plate body, the another part of plate body is fixedly connected with crossbeam 14, is this plate body two
End can produce a kind of power of bending, while general by being welded on weld seam between plate body and crossbeam 14
On be applied with pulling force, it is more likely that welding seam breaking can be made, cause the accident generation.
For this, we devise a kind of solution more optimized, as shown in Figure 8,9, figure
In illustrate drawing pull bar connecting seat 20 be provided with curb girder 10, the drawing pull bar connecting seat
20 include crossbeam connecting portion 23 and drawing pull bar connecting portion 24, and crossbeam connecting portion 23 is generally horizontal
Beam 14 matches arc-shaped；Drawing pull bar connecting portion 24 is located at below the connecting portion of crossbeam 14, and with
Crossbeam connecting portion 23 is integrally formed, and drawing pull bar connecting portion 24 is offered perpendicular to crossbeam 14
Connecting hole 25 on direction.
On the basis of above-mentioned design, the cross section of crossbeam connecting portion 23 be it is trapezoidal, it is trapezoidal
Top is shorter to be connected with crossbeam；It is trapezoidal following longer to be connected with drawing pull bar connecting portion 24.
Wherein drawing pull bar connecting seat 20 is preferably forging.Compared with casting, metal is by forging
Its institutional framework and mechanical property can be improved after processing.Forging method hot-working is passed through by cast sturcture
Deformation due to metal and recrystallization after deformation, are changed into original large dendritic crystal and columnar grain
Crystal grain is thinner, isometric recrystallized structure of uniform size, make original segregation in steel ingot, it is loose,
The compactings such as stomata, slag inclusion and soldering, its tissue become even closer, improve the plasticity of metal
And mechanical property.
For this, we also proposed a kind of track train, and such a track train is drawn using above-mentioned traction
The structure design of bar connecting seat 20, such a structure stress is more balanced, during design structure, it is considered to
The directionality problem of stress is arrived, structure is more reasonable, and intensity is higher.
It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., is only used
To coordinate the content disclosed in specification, so that those skilled in the art is understood with reading, and
It is not used to limit enforceable qualifications of the invention, therefore does not have technical essential meaning, appoints
What modification of structure, the change of proportionate relationship or adjustment of size, is not influenceing institute's energy of the present invention
Under effect of generation and the purpose that can reach, all should still it fall in disclosed technology
In the range of Rong get Neng is covered.Meanwhile, in this specification it is cited as " on ", " under ", " left side ",
The term of " right side ", " centre " etc., is merely convenient to understanding for narration, and is not used to limit this hair
Bright enforceable scope, being altered or modified for its relativeness, technology contents are being changed without essence
Under, when being also considered as enforceable category of the invention.
Carried out to curb girder provided by the present invention and using the track train of this curb girder above
It is discussed in detail.Specific case used herein is carried out to the principle and embodiment of the present invention
Illustrate, the explanation of above example is only intended to help the method and its core that understand the present invention to think
Think.It should be pointed out that for those skilled in the art, not departing from this hair
On the premise of bright principle, some improvement and modification can also be carried out to the present invention, these improve and
Modification is also fallen into the protection domain of the claims in the present invention.
Claims (10)
1. a kind of curb girder, the curb girder can be used for carrying air spring, it is characterised in that institute
State curb girder upper surface and be fixedly installed backing plate for installing the air spring, the backing plate tool
There is the upper surface obtained by machining.
2. curb girder as claimed in claim 1, it is characterised in that the curb girder be provided with
The guide pillar of the air spring adaptation, the top of the guide pillar is concordant with the upper surface of the curb girder；
The through hole connected with the guide pillar is offered in the middle part of the backing plate, and the backing plate covers
The seam crossing covered between the upper surface of the guide pillar and the curb girder.
3. curb girder as claimed in claim 2, it is characterised in that the backing plate is circle.
4. the curb girder as described in any in claims 1 to 3, it is characterised in that the side
The lower surface at beam two ends is fixedly installed primary spring seat respectively, and the primary spring seat is casting.
5. curb girder as claimed in claim 4, it is characterised in that the primary spring seat
Top is a flat board, and the flat board smoothly extends downwards shape in side along its length
Into one piece of bent plate；
Be a casing in the lower section of the bent plate, the bottom of the casing is lower cover, it is described under
Cover plate extends to both sides respectively along its width；The centre of the lower cover is offered
Mounting hole, the week side of boss of the lower cover offers the through hole for connecting single stage suspension；
The opposite side of the flat board be installing plate, the installing plate along its width respectively to
Both sides extend；The through hole for connecting single stage suspension is offered in the week side of boss of the installing plate.
6. curb girder as claimed in claim 5, it is characterised in that the lower cover along its
The length that width extends to both sides respectively is identical.
7. curb girder as claimed in claim 6, it is characterised in that the installing plate is wide along it
The length that degree direction extends to both sides respectively is identical.
8. curb girder as claimed in claim 7, it is characterised in that the thickness of the installing plate
More than the thickness of the flat board.
9. curb girder according to claim 8, it is characterised in that：The top of the installing plate
Portion is concordant with the flat board, and the bottom of the installing plate protrudes from the flat board.
10. a kind of track train, including the bogie with curb girder, it is characterised in that described
Curb girder is the curb girder any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610210989.8A CN107264559A (en) | 2016-04-06 | 2016-04-06 | Curb girder and the track train with the curb girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610210989.8A CN107264559A (en) | 2016-04-06 | 2016-04-06 | Curb girder and the track train with the curb girder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110789282A (en) * | 2018-08-02 | 2020-02-14 | 蔚来汽车有限公司 | Vehicle suspension swing arm, vehicle suspension system and vehicle |
| CN111267893A (en) * | 2020-03-13 | 2020-06-12 | 中车株洲电力机车有限公司 | Rail vehicle framework |
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| CN204355067U (en) * | 2014-12-16 | 2015-05-27 | 南车青岛四方机车车辆股份有限公司 | A kind of secondary suspension device used for rail vehicle |
| CN104554321A (en) * | 2014-12-23 | 2015-04-29 | 长春轨道客车股份有限公司 | Bogie for A-type broad-gauge metro vehicle |
| CN104859670A (en) * | 2015-02-05 | 2015-08-26 | 南车青岛四方机车车辆股份有限公司 | Bogie for mounting traction motor in flexible suspending manner |
| CN204399185U (en) * | 2015-02-11 | 2015-06-17 | 青岛三合山精密铸造有限公司 | A kind of metro bogie primary spring seat with sand cleaning hole |
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| CN110789282A (en) * | 2018-08-02 | 2020-02-14 | 蔚来汽车有限公司 | Vehicle suspension swing arm, vehicle suspension system and vehicle |
| CN110789282B (en) * | 2018-08-02 | 2024-01-02 | 蔚来(安徽)控股有限公司 | Vehicle suspension swing arm, vehicle suspension system and vehicle |
| CN111267893A (en) * | 2020-03-13 | 2020-06-12 | 中车株洲电力机车有限公司 | Rail vehicle framework |
| CN111267893B (en) * | 2020-03-13 | 2021-10-26 | 中车株洲电力机车有限公司 | Rail vehicle framework |
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Application publication date: 20171020 |