CN116674659A - A high-strength and lightweight body structure using a new technology - Google Patents
A high-strength and lightweight body structure using a new technology Download PDFInfo
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- CN116674659A CN116674659A CN202310509429.2A CN202310509429A CN116674659A CN 116674659 A CN116674659 A CN 116674659A CN 202310509429 A CN202310509429 A CN 202310509429A CN 116674659 A CN116674659 A CN 116674659A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D31/00—Superstructures for passenger vehicles
- B62D31/02—Superstructures for passenger vehicles for carrying large numbers of passengers, e.g. omnibus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/007—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of special steel or specially treated steel, e.g. stainless steel or locally surface hardened steel
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Abstract
本发明公开了一种采用新型工艺的高强度轻量化车身结构，车身侧部结构的前端和车身前部结构相连，车身侧部机构的后部和车身后部结构相连；所述车身前部结构包括前围、前档下横梁、左前立柱、前顶总成和右前立柱，所述前围位于车身前部结构的下部，前档下横梁位于车身前部结构的车窗的下方，左前立柱位于车身前部结构的车窗的左侧，右前立柱位于车身前部结构的车窗的右侧，前顶总成位于车身前部结构的车窗的顶部；左前立柱和右前立柱采用冷轧钢板漆压成型技术加工。本发明车身前后档左右立柱处采用冷轧钢板漆压成型工艺来代替传统工艺，减少应力残留，提升材料的屈服点，进而提高车身强度。
The invention discloses a high-strength and lightweight body structure adopting a new technology. The front end of the side structure of the body is connected with the front structure of the body, and the rear part of the side structure of the body is connected with the rear structure of the body; the front structure of the body It includes a front wall, a front lower beam, a left front pillar, a front roof assembly and a right front pillar. The left side of the window of the front structure of the body, the right front pillar is located on the right side of the window of the front structure of the body, and the front roof assembly is located on the top of the window of the front structure of the body; the left front pillar and the right front pillar are painted with cold-rolled steel plate Compression molding technology processing. In the present invention, the cold-rolled steel plate paint pressing forming process is used at the left and right columns of the front and rear rails of the vehicle body to replace the traditional process, so as to reduce residual stress, increase the yield point of the material, and further improve the strength of the vehicle body.
Description
技术领域technical field
本发明涉及一种采用新型工艺的高强度轻量化车身结构，属于车辆结构技术领域。The invention relates to a high-strength and lightweight vehicle body structure using a new technology, belonging to the technical field of vehicle structures.
背景技术Background technique
目前新能源观光车车身的连接方式多为热轧焊接成型技术，但经过热轧之后，钢材内部会出现分层(夹层)现象。使钢材沿厚度方向受拉的性能大大恶化，并且有可能在焊缝收缩时出现层间撕裂。不均匀冷却造成的残余应力也对钢构件在外力作用下的性能有一定影响。At present, the connection method of the body of the new energy sightseeing car is mostly hot-rolled welding forming technology, but after hot-rolling, there will be delamination (interlayer) phenomenon inside the steel. The performance of the steel in tension in the thickness direction is greatly deteriorated, and there is a possibility of interlaminar tearing when the weld shrinks. The residual stress caused by uneven cooling also has a certain influence on the performance of steel components under external forces.
发明内容Contents of the invention
本发明的目的在于，提供一种采用新型工艺的高强度轻量化车身结构，该车身在前后档左右立柱处采用冷轧钢板漆压成型工艺来代替传统工艺，减少应力残留，提升材料的屈服点，进而提高车身强度。The purpose of the present invention is to provide a high-strength and lightweight body structure using a new technology. The body adopts a cold-rolled steel plate paint pressing molding process to replace the traditional process at the front, rear, left and right columns, so as to reduce residual stress and increase the yield point of the material. , thereby increasing the body strength.
为解决上述技术问题，本发明采用如下的技术方案：In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:
一种采用新型工艺的高强度轻量化车身结构，包括车身前部结构、车身后部结构、车身侧部结构，车身前部结构位于车身的前部，车身后部结构位于车身的后部，车身侧部结构位于车身的尾部；车身侧部结构的前端和车身前部结构相连，车身侧部机构的后部和车身后部结构相连；所述车身前部结构包括前围、前档下横梁、左前立柱、前顶总成和右前立柱，所述前围位于车身前部结构的下部，前档下横梁位于车身前部结构的车窗的下方，左前立柱位于车身前部结构的车窗的左侧，右前立柱位于车身前部结构的车窗的右侧，前顶总成位于车身前部结构的车窗的顶部；左前立柱和右前立柱采用冷轧钢板漆压成型技术加工。A high-strength lightweight body structure using a new technology, including a front body structure, a body rear structure, and a body side structure. The front body structure is located at the front of the body, and the rear body structure is located at the rear of the body. The side structure is located at the tail of the body; the front end of the side structure of the body is connected to the front structure of the body, and the rear part of the side structure of the body is connected to the rear structure of the body; The left front pillar, the front roof assembly and the right front pillar, the cowl is located at the lower part of the front structure of the vehicle body, the lower beam of the front gear is located below the window of the front structure of the vehicle body, and the left front column is located on the left side of the window of the front structure of the vehicle body Side, the right front pillar is located on the right side of the window of the front structure of the body, and the front roof assembly is located on the top of the window of the front structure of the body; the left front pillar and the right front pillar are processed by cold-rolled steel plate paint pressure forming technology.
前述的一种采用新型工艺的高强度轻量化车身结构中，所述车身侧部结构包括顶纵梁、顶横梁、第一立柱、第二立柱、第三立柱和第四立柱，顶纵梁沿车身方向布置，顶纵梁的数量是两根，两根顶纵梁平行设置，顶横梁固定中顶纵梁上，顶横梁垂直于顶纵梁，顶横梁的数量大于或者等于三根；第一立柱和第二立柱位于车身侧部结构上车辆前轮的上方，第三立柱和第四立柱位于车身侧部结构上车辆后轮的上方；顶纵梁、第一立柱、第二立柱、第三立柱和第四立柱采用冷轧钢板漆压成型技术加工。In the aforementioned high-strength and lightweight body structure using a new technology, the side structure of the vehicle body includes a top longitudinal beam, a top beam, a first column, a second column, a third column and a fourth column, and the top longitudinal beam along the Arranged in the direction of the vehicle body, the number of top longitudinal beams is two, and the two top longitudinal beams are arranged in parallel. The top cross beam is fixed on the top longitudinal beam, and the top cross beam is perpendicular to the top longitudinal beam. and the second column are located above the front wheels of the vehicle on the body side structure, the third column and the fourth column are located above the rear wheels of the vehicle on the body side structure; the roof longitudinal beam, the first column, the second column, the third column And the fourth column is processed by cold-rolled steel plate paint pressing forming technology.
前述的一种采用新型工艺的高强度轻量化车身结构中，所述车身后部结构包括右侧立柱、左侧立柱、后顶横梁、后档下横梁、骨架竖管、骨架横管、后保险杠和后保险横梁，后顶横梁位于车身后部结构的上部，后保险杠位于车身后部结构的下部，左侧立柱位于车身后部结构的左侧，右侧立柱位于车身后部结构的右侧，后档下横梁位于车身后部结构上挡风玻璃的下方，后保险横梁位于后保险杠的上方，骨架横管位于后保险横梁的上方，骨架竖管位于骨架横管和后档下横梁之间；左侧立柱有右侧立柱采用冷轧钢板漆压成型技术加工。In the above-mentioned high-strength and lightweight body structure using a new technology, the rear structure of the vehicle body includes a right column, a left column, a rear roof beam, a rear rail lower beam, a skeleton vertical tube, a skeleton horizontal tube, and a rear insurance Bar and rear bumper beam, the rear roof beam is located in the upper part of the rear body structure, the rear bumper is located in the lower part of the rear body structure, the left pillar is located on the left side of the rear body structure, and the right pillar is located in the right Side, the rear bumper is located under the windshield on the rear structure of the vehicle body, the rear bumper is located above the rear bumper, the frame cross tube is located above the rear bumper, the frame vertical tube is located between the frame cross tube and the rear bumper Between; the left column and the right column are processed by cold-rolled steel plate paint pressing forming technology.
前述的一种采用新型工艺的高强度轻量化车身结构中，所述顶纵梁由一张钢板弯折而成，顶纵梁上具有下部槽体，下部槽体位于顶纵梁的下部，下部槽体用于容纳门框；顶纵梁具有上部槽体，上部槽体位于顶纵梁的上部，上部槽体用于容纳车辆的顶板。In the above-mentioned high-strength and lightweight body structure using a new technology, the roof longitudinal beam is formed by bending a steel plate, the roof longitudinal beam has a lower groove body, and the lower groove body is located at the lower part of the roof longitudinal beam. The groove body is used for accommodating the door frame; the top longitudinal beam has an upper groove body, the upper groove body is located on the upper part of the roof longitudinal beam, and the upper groove body is used for accommodating the roof plate of the vehicle.
与现有技术相比，本发明车身前后档左右立柱处采用冷轧钢板漆压成型工艺来代替传统工艺，减少应力残留，提升材料的屈服点，进而提高车身强度。对顶部纵梁结构进行改进及使用新型工艺同时可以减少材料消耗，降低生产成本，达到实现轻量化的目的。Compared with the prior art, the present invention adopts the cold-rolled steel plate paint pressing forming process at the left and right pillars of the front and rear rails of the vehicle body to replace the traditional process, so as to reduce residual stress, increase the yield point of the material, and further increase the strength of the vehicle body. Improving the structure of the top longitudinal beam and using a new technology can reduce material consumption, reduce production costs, and achieve the goal of light weight.
附图说明Description of drawings
图1是车身前部结构的一种实施例的结构示意图；Fig. 1 is a structural schematic diagram of an embodiment of the front structure of the vehicle body;
图2是车身侧部结构的一种实施例的结构示意图；Fig. 2 is a structural schematic diagram of an embodiment of the body side structure;
图3是车身后部结构的一种实施例的结构示意图；Fig. 3 is a structural schematic diagram of an embodiment of the vehicle body rear structure;
图4是顶纵梁的截面结构示意图。Fig. 4 is a schematic cross-sectional structure diagram of the top longitudinal beam.
附图标记：1-前围，2-前档下横梁，3-左前立柱，4-前顶总成，5-右前立柱，6-顶纵梁，7-顶横梁，8-第四立柱，9-第三立柱，10-第二立柱，11-第一立柱，12-右侧立柱，13-后顶横梁，14-左侧立柱，15-后裆下横梁，16-骨架竖管，17-骨架横管，18-后保险横梁，19-后保险杠。Reference signs: 1-front wall, 2-front lower crossbeam, 3-left front pillar, 4-front top assembly, 5-right front pillar, 6-top longitudinal beam, 7-top crossbeam, 8-fourth pillar, 9-third column, 10-second column, 11-first column, 12-right column, 13-back top beam, 14-left column, 15-back crotch beam, 16-skeleton vertical pipe, 17 -Skeleton cross tube, 18-Rear bumper beam, 19-Rear bumper.
下面结合附图和具体实施方式对本发明作进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
具体实施方式Detailed ways
本发明的实施例1：一种采用新型工艺的高强度轻量化车身结构，包括车身前部结构、车身后部结构、车身侧部结构，车身前部结构位于车身的前部，车身后部结构位于车身的后部，车身侧部结构位于车身的尾部；车身侧部结构的前端和车身前部结构相连，车身侧部机构的后部和车身后部结构相连；所述车身前部结构包括前围1、前档下横梁2、左前立柱3、前顶总成4和右前立柱5，所述前围1位于车身前部结构的下部，前档下横梁2位于车身前部结构的车窗的下方，左前立柱3位于车身前部结构的车窗的左侧，右前立柱5位于车身前部结构的车窗的右侧，前顶总成4位于车身前部结构的车窗的顶部；左前立柱3和右前立柱5采用冷轧钢板漆压成型技术加工。Embodiment 1 of the present invention: a high-strength lightweight body structure using a new technology, including a front body structure, a body rear structure, and a body side structure, the front body structure is located at the front of the body, and the rear body structure Located at the rear of the body, the body side structure is located at the rear of the body; the front end of the body side structure is connected to the body front structure, and the rear part of the body side structure is connected to the body rear structure; the body front structure includes a front Enclosure 1, front lower beam 2, left front pillar 3, front top assembly 4 and right front pillar 5, the front enclosure 1 is located at the lower part of the front structure of the vehicle body, and the front lower beam 2 is located at the window of the front structure of the vehicle body Below, the left front column 3 is positioned at the left side of the window of the front structure of the vehicle body, the right front column 5 is positioned at the right side of the window of the front structure of the vehicle body, and the front roof assembly 4 is positioned at the top of the window of the front structure of the vehicle body; 3 and the right front column 5 are processed by cold-rolled steel paint pressing forming technology.
实施例2：一种采用新型工艺的高强度轻量化车身结构，包括车身前部结构、车身后部结构、车身侧部结构，车身前部结构位于车身的前部，车身后部结构位于车身的后部，车身侧部结构位于车身的尾部；车身侧部结构的前端和车身前部结构相连，车身侧部机构的后部和车身后部结构相连；所述车身前部结构包括前围1、前档下横梁2、左前立柱3、前顶总成4和右前立柱5，所述前围1位于车身前部结构的下部，前档下横梁2位于车身前部结构的车窗的下方，左前立柱3位于车身前部结构的车窗的左侧，右前立柱5位于车身前部结构的车窗的右侧，前顶总成4位于车身前部结构的车窗的顶部；左前立柱3和右前立柱5采用冷轧钢板漆压成型技术加工。Embodiment 2: A high-strength lightweight body structure using a new technology, including a front body structure, a body rear structure, and a body side structure, the front body structure is located at the front of the body, and the rear body structure is located at the body At the rear, the body side structure is located at the rear of the body; the front end of the body side structure is connected to the body front structure, and the rear part of the body side structure is connected to the body rear structure; the body front structure includes a cowl 1, The front lower beam 2, the left front pillar 3, the front top assembly 4 and the right front pillar 5, the front wall 1 is located at the lower part of the front structure of the vehicle body, the front lower beam 2 is located under the window of the front structure of the vehicle body, and the left front Column 3 is located on the left side of the window of the front structure of the vehicle body, the right front column 5 is located on the right side of the window of the front structure of the vehicle body, and the front roof assembly 4 is located on the top of the window of the front structure of the vehicle body; the left front column 3 and the right front Column 5 is processed by cold-rolled steel plate paint pressing forming technology.
所述车身侧部结构包括顶纵梁6、顶横梁7、第一立柱11、第二立柱10、第三立柱9和第四立柱8，顶纵梁6沿车身方向布置，顶纵梁6的数量是两根，两根顶纵梁6平行设置，顶横梁7固定中顶纵梁6上，顶横梁7垂直于顶纵梁6，顶横梁7的数量大于或者等于三根；第一立柱11和第二立柱10位于车身侧部结构上车辆前轮的上方，第三立柱9和第四立柱8位于车身侧部结构上车辆后轮的上方；顶纵梁6、第一立柱11、第二立柱10、第三立柱9和第四立柱8采用冷轧钢板漆压成型技术加工。The side structure of the vehicle body comprises a top longitudinal beam 6, a top cross beam 7, a first column 11, a second column 10, a third column 9 and a fourth column 8, the top longitudinal beam 6 is arranged along the direction of the vehicle body, and the top longitudinal beam 6 The number is two, two top longitudinal beams 6 are arranged in parallel, the top cross beam 7 is fixed on the top longitudinal beam 6, the top cross beam 7 is perpendicular to the top longitudinal beam 6, and the number of top cross beams 7 is greater than or equal to three; the first column 11 and The second column 10 is located above the front wheels of the vehicle on the side structure of the vehicle body, and the third column 9 and the fourth column 8 are located above the rear wheels of the vehicle on the side structure of the vehicle body; the top longitudinal beam 6, the first column 11, the second column 10. The third column 9 and the fourth column 8 are processed by cold-rolled steel plate paint pressing forming technology.
实施例3：一种采用新型工艺的高强度轻量化车身结构，包括车身前部结构、车身后部结构、车身侧部结构，车身前部结构位于车身的前部，车身后部结构位于车身的后部，车身侧部结构位于车身的尾部；车身侧部结构的前端和车身前部结构相连，车身侧部机构的后部和车身后部结构相连；所述车身前部结构包括前围1、前档下横梁2、左前立柱3、前顶总成4和右前立柱5，所述前围1位于车身前部结构的下部，前档下横梁2位于车身前部结构的车窗的下方，左前立柱3位于车身前部结构的车窗的左侧，右前立柱5位于车身前部结构的车窗的右侧，前顶总成4位于车身前部结构的车窗的顶部；左前立柱3和右前立柱5采用冷轧钢板漆压成型技术加工。Embodiment 3: A high-strength and lightweight body structure using a new technology, including a front body structure, a body rear structure, and a body side structure, the front body structure is located at the front of the body, and the rear body structure is located at the At the rear, the body side structure is located at the rear of the body; the front end of the body side structure is connected to the body front structure, and the rear part of the body side structure is connected to the body rear structure; the body front structure includes a cowl 1, The front lower beam 2, the left front pillar 3, the front top assembly 4 and the right front pillar 5, the front wall 1 is located at the lower part of the front structure of the vehicle body, the front lower beam 2 is located under the window of the front structure of the vehicle body, and the left front Column 3 is located on the left side of the window of the front structure of the vehicle body, the right front column 5 is located on the right side of the window of the front structure of the vehicle body, and the front roof assembly 4 is located on the top of the window of the front structure of the vehicle body; the left front column 3 and the right front Column 5 is processed by cold-rolled steel plate paint pressing forming technology.
所述车身侧部结构包括顶纵梁6、顶横梁7、第一立柱11、第二立柱10、第三立柱9和第四立柱8，顶纵梁6沿车身方向布置，顶纵梁6的数量是两根，两根顶纵梁6平行设置，顶横梁7固定中顶纵梁6上，顶横梁7垂直于顶纵梁6，顶横梁7的数量大于或者等于三根；第一立柱11和第二立柱10位于车身侧部结构上车辆前轮的上方，第三立柱9和第四立柱8位于车身侧部结构上车辆后轮的上方；顶纵梁6、第一立柱11、第二立柱10、第三立柱9和第四立柱8采用冷轧钢板漆压成型技术加工。The side structure of the vehicle body comprises a top longitudinal beam 6, a top cross beam 7, a first column 11, a second column 10, a third column 9 and a fourth column 8, the top longitudinal beam 6 is arranged along the direction of the vehicle body, and the top longitudinal beam 6 The number is two, two top longitudinal beams 6 are arranged in parallel, the top cross beam 7 is fixed on the top longitudinal beam 6, the top cross beam 7 is perpendicular to the top longitudinal beam 6, and the number of top cross beams 7 is greater than or equal to three; the first column 11 and The second column 10 is located above the front wheels of the vehicle on the side structure of the vehicle body, and the third column 9 and the fourth column 8 are located above the rear wheels of the vehicle on the side structure of the vehicle body; the top longitudinal beam 6, the first column 11, the second column 10. The third column 9 and the fourth column 8 are processed by cold-rolled steel plate paint pressing forming technology.
所述车身后部结构包括右侧立柱12、左侧立柱14、后顶横梁13、后档下横梁15、骨架竖管16、骨架横管17、后保险杠19和后保险横梁18，后顶横梁13位于车身后部结构的上部，后保险杠19位于车身后部结构的下部，左侧立柱14位于车身后部结构的左侧，右侧立柱12位于车身后部结构的右侧，后档下横梁15位于车身后部结构上挡风玻璃的下方，后保险横梁18位于后保险杠19的上方，骨架横管17位于后保险横梁18的上方，骨架竖管16位于骨架横管17和后档下横梁15之间；左侧立柱14有右侧立柱12采用冷轧钢板漆压成型技术加工。所述顶纵梁6由一张钢板弯折而成，顶纵梁6上具有下部槽体，下部槽体位于顶纵梁6的下部，下部槽体用于容纳门框；顶纵梁6具有上部槽体，上部槽体位于顶纵梁6的上部，上部槽体用于容纳车辆的顶板。The rear structure of the vehicle body comprises a right side column 12, a left side column 14, a rear top beam 13, a lower beam 15 for the rear gear, a skeleton vertical tube 16, a skeleton horizontal tube 17, a rear bumper 19 and a rear bumper beam 18, and the rear roof The beam 13 is located at the upper part of the rear structure of the vehicle body, the rear bumper 19 is located at the lower part of the rear structure of the vehicle body, the left column 14 is located at the left side of the rear structure of the vehicle body, the right column 12 is located at the right side of the rear structure of the vehicle body, and the rear bumper The lower beam 15 is positioned under the windshield on the rear structure of the vehicle body, the rear bumper beam 18 is positioned above the rear bumper 19, the frame cross tube 17 is positioned above the rear bumper beam 18, and the frame vertical tube 16 is positioned between the frame cross tube 17 and the rear bumper. Between the lower beams 15 of the shelves; the left side column 14 has the right side column 12 and adopts cold-rolled steel plate paint pressing forming technology to process. The top longitudinal beam 6 is formed by bending a steel plate, and the top longitudinal beam 6 has a lower groove body, which is located at the bottom of the top longitudinal beam 6, and the lower groove body is used to accommodate the door frame; the top longitudinal beam 6 has an upper The tank body, the upper tank body is located on the upper part of the roof longitudinal beam 6, and the upper tank body is used to accommodate the roof plate of the vehicle.
本发明的一种实施例的工作原理：在观光车车身前后档左右立柱处采用冷轧钢板漆压成型技术来代替传统热轧焊接钢管工艺，对顶部纵梁的结构使用新型工艺加工并进行改进，达到车身强度提升及轻量化的目的。与现有的新能源观光车车身结构相比，冷漆压钢板成型工艺成型速度快、产量高，且不损伤涂层，可以做成多种多样的截面形式，以适应使用条件的需要；可以使钢材产生很大的塑性变形，从而提高了钢材的屈服点，提升车身强度。对顶部纵梁结构进行改进，减少了材料的消耗，实现了轻量化。The working principle of an embodiment of the present invention: the cold-rolled steel plate paint pressing forming technology is used to replace the traditional hot-rolled welded steel pipe process at the front, rear, left and right columns of the body of the sightseeing car, and a new process is used to process and improve the structure of the top longitudinal beam , to achieve the purpose of increasing the strength and reducing the weight of the vehicle body. Compared with the existing body structure of new energy sightseeing cars, the forming process of cold-painted steel plate has fast forming speed, high output, and does not damage the coating. It can be made into various cross-sectional forms to meet the needs of use conditions; The steel produces a large plastic deformation, thereby increasing the yield point of the steel and improving the strength of the vehicle body. The structure of the top longitudinal beam is improved to reduce the consumption of materials and achieve light weight.
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| JPH09295588A (en) * | 1996-04-30 | 1997-11-18 | Nissan Shatai Co Ltd | Car body side portion structure |
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| WO2018076662A1 (en) * | 2016-10-27 | 2018-05-03 | 深圳市招科智控科技有限公司 | Vehicle body framework assembly for use in driverless vehicle |
| CN208325396U (en) * | 2018-06-26 | 2019-01-04 | 南京恒天领锐汽车有限公司 | A kind of lightweight body frame assembly of pure electric vehicle 4 wheel driven car |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09295588A (en) * | 1996-04-30 | 1997-11-18 | Nissan Shatai Co Ltd | Car body side portion structure |
| KR20120000363A (en) * | 2010-06-25 | 2012-01-02 | 주식회사 디유에이엔아이 | Side assembly, roof assembly and lightweight bus body with them |
| WO2018076662A1 (en) * | 2016-10-27 | 2018-05-03 | 深圳市招科智控科技有限公司 | Vehicle body framework assembly for use in driverless vehicle |
| CN107738693A (en) * | 2017-11-14 | 2018-02-27 | 辽宁忠旺特种车辆制造有限公司 | A kind of front wall assembly of body structure |
| CN208325396U (en) * | 2018-06-26 | 2019-01-04 | 南京恒天领锐汽车有限公司 | A kind of lightweight body frame assembly of pure electric vehicle 4 wheel driven car |
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Application publication date: 20230901 |