CN110422195B - Traction and bolster buffering structure for suspension type monorail train - Google Patents
Traction and bolster buffering structure for suspension type monorail train Download PDFInfo
- Publication number
- CN110422195B CN110422195B CN201910876383.1A CN201910876383A CN110422195B CN 110422195 B CN110422195 B CN 110422195B CN 201910876383 A CN201910876383 A CN 201910876383A CN 110422195 B CN110422195 B CN 110422195B
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- traction
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- buffer
- seat
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- 239000000725 suspension Substances 0.000 title claims abstract description 41
- 230000003139 buffering effect Effects 0.000 title description 9
- 241001669679 Eleotris Species 0.000 claims abstract description 58
- 238000009434 installation Methods 0.000 claims abstract description 30
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 33
- 238000005242 forging Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B61F5/02—Arrangements permitting limited transverse relative movements between vehicle underframe or bolster and bogie; Connections between underframes and bogies
- B61F5/22—Guiding of the vehicle underframes with respect to the bogies
- B61F5/24—Means for damping or minimising the canting, skewing, pitching, or plunging movements of the underframes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61G—COUPLINGS; DRAUGHT AND BUFFING APPLIANCES
- B61G9/00—Draw-gear
- B61G9/20—Details; Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention relates to a traction sleeper buffer structure for a suspension type monorail train, which comprises a car coupler installation seat plate, a traction beam, a buffer beam and a sleeper beam, wherein the lower end of the car coupler installation seat plate is connected to the front end of the traction beam, the front end of the buffer beam is fixedly connected to the traction beam and the car coupler installation seat plate, the rear end of the buffer beam is fixedly connected to the sleeper beam, the car coupler installation seat plate is made of an aluminum alloy plate, the traction beam and the upper end beam are of an integrated structure, the traction beam is formed by extrusion molding of aluminum alloy and is fixedly connected with longitudinal beams of a train body at the lower parts of two ends.
Description
Technical Field
The invention relates to the technical field of suspended monorail traffic, in particular to a traction and bolster buffering structure for a suspended monorail train.
Background
Along with the construction of urban rail transit, the novel system rail transit system with medium and low traffic volume is increasingly required as the urban main urban area extends to the peripheral area and the first-line urban area extends to the second-third-line urban area. Owing to the advantages, the domestic suspension type monorail technology is greatly developed, but due to the fact that the domestic suspension type monorail is started later, corresponding technical accumulation and practical experience are lacked, and particularly, the key part of the safety of a vehicle is involved, and the design scheme of the technology is required to be perfected and improved.
The traction sleeper buffer structure of the suspension type monorail train is used for connecting a train body with a bogie, and a train body with a train coupler and is responsible for transmitting traction power to the train body, so that the traction sleeper buffer is a component with complex stress and large load, and the problems of high structural strength requirement, complex process, difficult manufacture and the like are faced in the design and manufacturing process. On the other hand, the suspended monorail traffic is used as a traffic mode with medium and low traffic, the vehicle body is relatively small, the wheelbase and the vehicle length are less than half of that of a metro vehicle, so that the traction and bolster is limited by a large space in outline, and the vehicle body is under because of the unique running mode of the suspended monorail, namely the bogie is above, so that the suspended monorail traffic has the problem of light weight.
Therefore, the designer of the present invention has developed a traction and bolster cushioning structure for a suspended monorail train to overcome the above-mentioned drawbacks by combining the experience and achievements of related industries for a long period of time through intensive research and design.
Disclosure of Invention
The invention aims to provide a traction and bolster buffering structure for a suspension type monorail train, which has the advantages of simple structure, convenient operation and loading and unloading, light structure, reasonable structure, long service life, capability of meeting the traction and bolster buffering usability requirement and simpler maintenance and replacement.
In order to solve the problems, the invention discloses a traction sleeper buffer structure for a suspension type monorail train, which comprises a car coupler installation seat plate, a traction beam, a buffer beam and a sleeper beam, wherein the lower end of the car coupler installation seat plate is connected with the front end of the traction beam, the front end of the buffer beam is fixedly connected to the traction beam and the car coupler installation seat plate, and the rear end of the buffer beam is fixedly connected to the sleeper beam, and the traction sleeper buffer structure is characterized in that:
The car coupler installation seat board is made of an aluminum alloy plate, a sinking table is arranged in the middle of the car coupler installation seat board, a plurality of bolt holes are formed in the sinking table so as to be bolted with the car coupler, the traction beam and the upper end beam are of an integrated structure, and the traction beam is formed by extrusion forming of aluminum alloy and is fixedly connected with longitudinal beams of a car body in a welding mode below two ends.
Wherein: the buffer beam is composed of a first side vertical plate, a second side vertical plate, an upper cover plate and a lower cover plate, the lower cover plate is of a flat plate structure, the front end of the lower cover plate is welded and fixedly connected to the rear end of the traction beam, the rear end of the lower cover plate is welded and fixedly connected to the front end of the sleeper beam, the upper cover plate is a bent section bar, the buffer beam comprises a front flat plate, a rear flat plate and a middle inclined plate, the front end of the front flat plate is welded and fixedly connected to the front end of the sleeper beam, the middle inclined plate is connected with the front flat plate and the rear flat plate in a connecting mode, the connecting positions of the middle inclined plate and the front flat plate are connected through arc bending, and the two sides of the upper cover plate and the two sides of the lower cover plate are welded and fixedly connected through the first side vertical plate and the second side vertical plate respectively, so that a main body of the whole buffer beam is formed.
Wherein: the upper cover plate of the buffer beam is provided with a plurality of operation holes at the position of the front flat plate so as to carry out nut fastening operation, and the junction of the first side vertical plate and the second side vertical plate with the car coupler installation seat plate and the traction beam is provided with a drain hole.
Wherein: and a buffer Liang Fangshui plate is welded between the front ends of the upper cover plate and the lower cover plate of the buffer beam and above the right of the traction beam.
Wherein: the four corners of the upper cover plate are respectively provided with a buffer Liang Buban, the buffer Liang Buban is in a right-angle triangle shape, one right-angle side of the buffer Liang Buban is fixedly connected with the upper cover plate by welding, and the other right-angle side of the buffer Liang Buban is fixedly connected to a coupler installation seat or a sleeper beam by welding.
Wherein: the sleeper beam is formed by welding two sections, and a suspension bracket mounting seat, a traction pull rod seat, a safety steel cable seat, a transverse stop and a bolt seat are fixedly connected to the sleeper beam.
Wherein: the front end of the sleeper beam is provided with a traction pull rod seat, the front end and the rear end of the upper surface of the sleeper beam are provided with a safety steel cable seat, four corners of the sleeper beam are respectively provided with a suspension bracket mounting seat, two sides of each suspension bracket mounting seat are respectively provided with a bolt seat, the left side and the right side of each suspension bracket mounting seat are respectively provided with a transverse stop, and the lower parts of the left end and the right end of the sleeper beam are fixedly connected with a longitudinal beam of a vehicle body in a welding way
Wherein: the suspension bracket mounting seat is a forging piece, is a trapezoid body with a small upper part and a large lower part, penetrates through a mounting hole on the sleeper beam during mounting, and is effectively fixedly connected by groove welding at the joint of the upper plane and the lower plane of the sleeper beam.
Wherein: the traction pull rod seat is a forging piece and is of an inverted F-shaped structure, the traction pull rod seat is fixedly connected between the buffer beam and the sleeper beam in a welding mode, the safety steel rope seat is a forging piece and is fixedly connected to the upper plane of the sleeper beam in a welding mode, the transverse stop is a forging piece, the whole traction pull rod seat is of a T-shaped structure, and the traction pull rod seat is fixedly connected to two sides of the sleeper beam in a welding mode.
According to the structure, the traction and bolster buffering structure for the suspension type monorail train has the following effects:
1. The connecting pin is used for connecting the upper suspension bracket mounting seat of the sleeper beam with the upper suspension bracket of the bogie, the connecting pin is in transition fit with the suspension bracket mounting seat and is in clearance fit with the suspension bracket, the bolt seat is welded beside the suspension bracket mounting seat, the connecting pin is fixed by penetrating under and propping against the connecting pin through the bolt, the rigid connection between the suspension bracket and the vehicle body through the mounting pin is realized, and the structure is stable.
2. The transmission of longitudinal force is better realized, and the structural strength is ensured.
3. Solves the problems that the stress of the weak part of the structure is too concentrated and fatigue cracks are easy to generate at the welding seam, and effectively prolongs the service life.
The details of the present invention can be found in the following description and the accompanying drawings.
Drawings
Fig. 1 shows a schematic structural view of a traction and bolster cushioning structure for a suspended monorail car of the present invention.
Fig. 2 shows an exploded view of the present invention.
Detailed Description
The bogie of a suspended monorail vehicle is quite different from the bogies of other rail transit vehicles, and therefore the connection of a suspended monorail vehicle to a bogie excessively requires new changes and adaptations. The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.
For convenience of description, the running direction of a train is the front and the opposite direction to the running direction of the train is the rear in the longitudinal direction with the running direction parallel to the running direction of the train as the longitudinal direction. In the plane parallel to the track, the direction perpendicular to the longitudinal direction is transverse, and in the transverse direction, the direction on the left side is left and the direction on the right side is right when seen along the running direction of the train; the direction perpendicular to the track surface is vertical, and in the vertical direction, the direction close to the track surface is upward, and the direction far from the track surface is downward.
Referring to fig. 1 and 2, there is shown a traction bolster cushioning structure for a suspended monorail car of the present invention.
The traction sleeper buffer structure for the suspension type monorail train comprises a car coupler installation seat board 1, a traction beam 2, a buffer beam 3 and a sleeper beam 4, wherein the lower end of the car coupler installation seat board 1 is welded and fixedly connected to the front end of the traction beam 2, the front end of the buffer beam 3 is welded and fixedly connected to the traction beam 2 and the car coupler installation seat board 1, the rear end of the buffer beam 3 is welded and fixedly connected to the sleeper beam 4, and a suspension bracket installation seat 5, a traction pull rod seat 6, a safety steel cable seat 7, a transverse stop 8 and a bolt seat 9 are welded and fixedly connected to the sleeper beam 4.
The car coupler installation seat board 1 is made of an aluminum alloy plate, is perpendicular to the traction beam 2 and is provided with a sinking platform at the middle part, and a plurality of bolt holes are formed in the sinking platform, so that the car coupler installation seat board 1 can be bolted with a car coupler, and the size of the sinking platform at the bolt hole formed in the car coupler installation seat board 1 is matched with a car coupler installation structure.
The traction beam 2 can be connected to an upper end beam of a vehicle roof, and is preferably of an integral structure with the upper end beam, the traction beam 2 is formed by adopting aluminum alloy extrusion molding and is fixedly connected with longitudinal beams of a vehicle body under two ends, and the structure enables the traction beam and the upper end beam to be combined into a whole, so that the traction beam has the function of the upper end beam at the same time, the traction sleeper buffering structure is simplified, the weight is reduced, and the structural rigidity and stability are improved.
The present invention particularly designs a bumper beam 3, wherein the bumper beam 3 mainly comprises a first side vertical plate 3-1, a second side vertical plate 3-2, an upper cover plate 3-3 and a lower cover plate 3-4, referring to fig. 2, the lower cover plate 3-4 is of a flat plate structure, the front end of the lower cover plate is welded and fixedly connected to the rear end of the draft sill 2, the rear end of the lower cover plate is welded and fixedly connected to the front end of the sleeper beam 3, the upper cover plate 3-3 is a bending section, particularly the section of the bending section is pi-shaped, as shown in fig. 2, the upper cover plate 3-3 comprises a front flat plate, a rear flat plate, the front end of which is welded and fixedly connected to a coupler installation seat plate 1, a rear flat plate and a middle inclined plate, which is fixedly connected to the front end and the rear flat plate of the sleeper beam 3, the connecting positions of the middle inclined plate and the front flat plate are connected through arc bending, and the two sides of the upper cover plate 3-3 and the lower cover plate 3-4 are respectively welded and fixedly connected through the first side vertical plate 3-1 and the second side vertical plate 3-2, so as to form a main body of the whole bumper beam 3. The upper cover plate 3-3 of the buffer beam 3 is provided with a plurality of operation holes at the position of the front flat plate so as to carry out nut installation and fastening operation of the car coupler, and the intersection of the two sides of the first side vertical plate 3-1 and the second side vertical plate 3-2 with the car coupler installation seat plate 1 and the traction beam 2 is provided with a drain hole.
Therefore, because the structure of the suspension type monorail train is limited by a larger space, the length direction is smaller, the conventional web plate and cover plate splice welding structure is adopted in the early stage, and the weld joint has larger stress concentration and is easy to generate fatigue cracks, the buffer beam structure is designed through long-term creative labor, the upper cover plate 3-3 of the buffer beam is a lower opening type section bar which is bent, the section shape of the bent section bar is pi-shaped, and the first side vertical plate 3-1 of the buffer beam and the second side vertical plate 3-2 of the buffer beam are fixedly connected with the lower cover plate 3-4 through welding to form a buffer beam main body, and the structure moves the weld joint downwards through changing the shape of a plate, so that the problems that the stress of the weak part of the structure is too concentrated and the fatigue cracks are easy to generate at the weld joint are solved.
Wherein, between the front ends of the upper cover plate 3-3 and the lower cover plate 3-4 of the buffer beam 3 and the right upper part of the traction beam 2 is welded with a buffer Liang Fangshui plate 3-5, which can effectively prevent external water sources such as rainwater from entering the inside of the vehicle body through traction pillow.
The four corners of the upper cover plate 3-3 are respectively provided with a buffer Liang Buban-6, the buffer Liang Buban-6 is in a right-angle triangle shape, one right-angle side of the buffer Liang Buban-6 is fixedly connected with the upper cover plate 3-3 by welding, and the other right-angle side of the buffer Liang Buban-6 is fixedly connected with the coupler installation seat 1 or the sleeper beam 4 by welding.
The sleeper beam 4 is formed by welding two sectional materials, a traction pull rod seat 6 is arranged at the front end of the sleeper beam, a safety steel rope seat 7 is arranged at the front end and the rear end of the upper surface of the sleeper beam, suspension bracket installation seats 5 are respectively arranged at the four corners of the sleeper beam, bolt seats 9 are respectively arranged at the two sides of each suspension bracket installation seat 5, transverse stop blocks 8 are respectively arranged at the left side and the right side of the sleeper beam, and the lower parts of the left end and the right end of the sleeper beam 4 are fixedly connected with a longitudinal beam of a vehicle body in a welding mode.
The suspension mounting seat 5 is a forging piece, is a trapezoid body with a small upper part and a large lower part, penetrates through a mounting hole in the sleeper beam 4 during mounting, and is effectively fixedly connected by welding a groove at the joint of the upper plane and the lower plane of the sleeper beam 4.
The traction rod seat 6 is a forging piece and is of an inverted F-shaped structure, the traction rod seat is fixedly connected between the buffer beam 3 and the sleeper beam 4 in a welding mode, the safety steel rope seat 7 is a forging piece and is fixedly connected to the upper plane of the sleeper beam in a welding mode, the transverse stop 8 is a forging piece and is integrally of a T-shaped structure, and the transverse stop 8 is fixedly connected to two sides of the sleeper beam in a welding mode.
The traction and bolster buffering structure connects a suspension bracket mounting seat 5 on the bolster 4 with a suspension bracket on the bogie through a connecting pin, and the connecting pin is in transition fit with the suspension bracket mounting seat and is in clearance fit with the suspension bracket. A bolt seat 9 is welded beside the suspension mounting seat 5, and a bolt is used for penetrating downwards and propping against the connecting pin so as to fix the connecting pin.
Therefore, the traction and bolster buffering structure of the invention connects the suspension bracket mounting seat on the bolster and the suspension bracket on the bogie together through the connecting pin, and the connecting pin is in transition fit with the suspension bracket mounting seat and is in clearance fit with the suspension bracket. And welding a bolt seat beside the hanger mounting seat, penetrating downwards by using a bolt and propping against the connecting pin so as to fixedly connect the connecting pin. The structure realizes rigid connection of the hanging frame and the vehicle body through the mounting pin, has stable structure, better realizes the transmission of longitudinal force, ensures the structural strength and has feasible process.
It is to be clearly understood that the above description and illustration is made only by way of example and not as a limitation on the disclosure, application or use of the invention. Although embodiments have been described in the embodiments and illustrated in the accompanying drawings, the invention is not limited to the specific examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the invention, and the scope of the invention will include any embodiments falling within the foregoing specification and the appended claims.
Claims (6)
1. The utility model provides a lead pillow buffer structure for suspension type monorail train, includes coupling mounting plate, draft sill, buffer beam and sleeper beam, the lower extreme of coupling mounting plate is connected in the front end of draft sill, the front end of buffer beam links firmly to draft sill and coupling mounting plate, and the rear end links firmly to the sleeper beam, its characterized in that:
The car coupler installation seat plate is made of an aluminum alloy plate, a sinking table is arranged in the middle of the car coupler installation seat plate, a plurality of bolt holes are formed in the sinking table so as to be bolted with the car coupler, the traction beam and the upper end beam are of an integrated structure, and the traction beam is formed by extrusion molding of aluminum alloy and is fixedly connected with longitudinal beams of a car body in a welding manner below two ends;
The buffer beam consists of a first side vertical plate, a second side vertical plate, an upper cover plate and a lower cover plate, the lower cover plate is of a flat plate structure, the front end of the lower cover plate is fixedly connected to the rear end of the traction beam in a welding way, the rear end of the lower cover plate is fixedly connected to the front end of the sleeper beam in a welding way, the upper cover plate is a bent section bar and comprises a front flat plate, the rear end of the front flat plate is fixedly connected to the front end of the coupler installation seat plate in a welding way, a rear flat plate and a middle inclined plate, the middle inclined plate is connected with the front flat plate and the rear flat plate in a welding way, the connecting positions of the middle inclined plate and the front flat plate are connected through arc bending, and the two sides of the upper cover plate and the two sides of the lower cover plate are respectively fixedly connected through the first side vertical plate and the second side vertical plate in a welding way, so that the main body of the whole buffer beam is formed;
The buffer Liang Fangshui plates are welded between the front ends of the upper cover plate and the lower cover plate of the buffer beam and at the upper right side of the traction beam, the four corners of the upper cover plate are respectively provided with a buffer Liang Buban, the buffer Liang Buban is in a right-angle triangle shape, one right-angle side of the buffer Liang Buban is welded and fixedly connected with the upper cover plate, and the other right-angle side of the buffer Liang Buban is welded and fixedly connected with the coupler installation seat or the sleeper beam.
2. The traction bolster cushioning structure for a suspended monorail car of claim 1, wherein: the upper cover plate of the buffer beam is provided with a plurality of operation holes at the position of the front flat plate so as to carry out nut fastening operation, and the junction of the first side vertical plate and the second side vertical plate with the car coupler installation seat plate and the traction beam is provided with a drain hole.
3. The traction bolster cushioning structure for a suspended monorail car of claim 1, wherein: the sleeper beam is formed by welding two sections, and a suspension bracket mounting seat, a traction pull rod seat, a safety steel cable seat, a transverse stop and a bolt seat are fixedly connected to the sleeper beam.
4. A traction bolster cushioning structure for a suspended monorail car as defined in claim 3, wherein: the front end of the sleeper beam is provided with a traction pull rod seat, the front end and the rear end of the upper surface of the sleeper beam are provided with a safety steel cable seat, four corners of the sleeper beam are respectively provided with a suspension bracket mounting seat, two sides of each suspension bracket mounting seat are respectively provided with a bolt seat, the left side and the right side of each suspension bracket mounting seat are respectively provided with a transverse stop, and the lower parts of the left end and the right end of the sleeper beam are fixedly connected with a longitudinal beam of a vehicle body in a welding way.
5. A traction bolster cushioning structure for a suspended monorail car as defined in claim 3, wherein: the suspension bracket mounting seat is a forging piece, is a trapezoid body with a small upper part and a large lower part, penetrates through a mounting hole on the sleeper beam during mounting, and is effectively fixedly connected by groove welding at the joint of the upper plane and the lower plane of the sleeper beam.
6. A traction bolster cushioning structure for a suspended monorail car as defined in claim 3, wherein: the traction pull rod seat is a forging piece and is of an inverted F-shaped structure, the traction pull rod seat is fixedly connected between the buffer beam and the sleeper beam in a welding mode, the safety steel rope seat is a forging piece and is fixedly connected to the upper plane of the sleeper beam in a welding mode, the transverse stop is a forging piece, the whole traction pull rod seat is of a T-shaped structure, and the traction pull rod seat is fixedly connected to two sides of the sleeper beam in a welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910876383.1A CN110422195B (en) | 2019-09-17 | 2019-09-17 | Traction and bolster buffering structure for suspension type monorail train |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910876383.1A CN110422195B (en) | 2019-09-17 | 2019-09-17 | Traction and bolster buffering structure for suspension type monorail train |
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| CN110422195A CN110422195A (en) | 2019-11-08 |
| CN110422195B true CN110422195B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910876383.1A Active CN110422195B (en) | 2019-09-17 | 2019-09-17 | Traction and bolster buffering structure for suspension type monorail train |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111071267A (en) * | 2020-01-13 | 2020-04-28 | 中铁工程机械研究设计院有限公司 | Buffer beam structure for suspension type monorail train |
| CN111994107A (en) * | 2020-08-17 | 2020-11-27 | 中车长春轨道客车股份有限公司 | Novel rail vehicle end chassis device |
| CN114289919B (en) * | 2021-12-29 | 2023-06-27 | 南京海高德新技术有限公司 | Welding process for traction and bolster buffering of lightweight aluminum alloy vehicle body |
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| CN110422195A (en) | 2019-11-08 |
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