TWM313094U - Improved chassis backbone frame for vehicle - Google Patents

Description

M313094 VIII. New description: [Technical field of new type] This creation is a vehicle aluminum alloy girders which are integrally formed by welding at least two or more aluminum alloy extruded units. [Prior Art] The chassis girders installed in general vehicles are I-shaped steel plates, and the I-beams made of the steel plates are formed by stacking three steel plates in a stack. Because the weight of the vehicle girders made of steel plates is heavy, it not only increases. The weight of the car body itself increases the fuel consumption. Therefore, the chassis-related manufacturing of the vehicle is changed to an aluminum alloy material with a light weight and sufficient bearing capacity to manufacture the girders, thereby achieving the effect of light body and fuel economy. However, according to the Shixialing Jindaliang_fabrication system, the 4 steel plates of the county are welded to each other, and the 3rd and 4th-old gold-reduced stacking welding of the county is changed, or the hybrid-body molding, because of the large-scale machine, mold and other funds required for the integrally formed beam manufacturing Disk space, at the same time must also be developed for different models and sizes of investment, so basically a heart of the job to test i, the qing jin plate is connected to the == tang welding, but this traditional way in the plate welding __ 定, therefore, in the process of welding stability, the production process is not only difficult, but also the precision and processing quality are not / so the industrial utilization is limited, the industrial efficiency and quality are not good. [New content] This creation is a kind of "improved vehicle large-scale big 襟 以 以 至少 至少 , , , 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 313 For the joint groove supply, the other-unit insertion is combined with the welding and fixation--the overall vehicle alloy alloy standard, (4) the brain alloy extrusion type (four) is inserted into the joint, effectively producing the processed turning property to listen to the processing quality of the hammer. In addition, due to the rapid integration, the processing capacity is relatively improved, and the product is also stable and excellent. Therefore, it has substantial industrial utilization and economic efficiency. - [Embodiment] Please refer to the figure in the same figure to the 32nd The various application implementations shown in the figure include the example 'where the original "improved vehicle beam structure" is at least two (as shown in Figures 13, 17, 2, 29, 31) or more than two (such as The alloy extrusion unit of the example shown in the figures of 3, 5, 7, $, u, 15, 19, 23, 25, 27) is welded to each other and has at least one U shape on at least one or two of the units. The coupling groove is for another unit to be inserted into the aluminum alloy of the combined welding and fixing Jintai Liang. As in the first and second embodiments, the girders are formed by stacking and welding of the three-factor alloy extruded units (1), (2), and (3), and the lower surface of the unit (1) The center is downward _ extending the vertical plate body (10), the bottom end of the vertical plate body (1〇) is provided with a mouth-shaped matching groove G, and the top end is inserted into the center, and the center of the upper surface of the unit (2) There is an upward vertical plate body (2 inches), and the top of the vertical plate body (20) is provided. The shape matching groove (22) is for inserting the pair s at the bottom end of the unit (3), and the vertical plate body is the unit (3), and the merging groove (12) of the unit (1) and the unit (2) respectively through the top end and the bottom end thereof ( 22) Welding and fixing the aluminum alloy girders of the vehicle as a whole. According to the second embodiment shown in Figs. 3 and 4, the girders are composed of three aluminum alloy extruded units (1), (2), and (3) stacked and welded, and both sides of the unit (〗) The lower edge is provided with a reinforcing wall (11), the lower plate surface extends downwardly to the vertical plate body (1〇), and the bottom plate M313094 end of the vertical plate body (1〇) is provided with a U-shaped matching groove (12) for the unit (3) The top end is inserted into the joint; the lower part of the unit (2) is a plate body having a reinforcing wall (21) on the upper edges of the two sides, and the upper vertical plate body (20) is provided in the center of the upper plate surface, the vertical plate body ( The top end of 20) is provided with a u-shaped matching groove (22) for inserting the bottom end of the unit (3); the unit (3) is a vertical plate body, and the unit (1) and the unit are respectively connected via the top end and the bottom end thereof ( 2) The matching grooves (12) and (22) are welded and fixed into a whole vehicle aluminum alloy girders. In the third embodiment shown in FIG. 5 and FIG. 6, the girders are composed of three alloy-squeeze-type units (1), (2), and (3) stacked and welded, and the unit (1) is The center of the board surface is provided with a U-shaped matching groove (12) for inserting the top end of the unit (3); the center of the upper surface of the unit (2) is provided with a U-shaped matching groove (22) for inserting the bottom end of the unit (3) The unit (3) is a vertical plate body, and is welded and fixed to the vehicle aluminum alloy girders integrally with the unit (1) and the matching grooves (12) and (22) of the unit (2) through the top and bottom ends thereof. According to the fourth embodiment shown in FIG. 7 and FIG. 8, the girders are composed of three alloy-extruded units (1), (2), and (3) stacked and welded, and the unit (1) is two. The lower edge of the lower side is provided with a reinforcing wall (11), and the center of the lower plate surface is provided with a U-shaped matching groove (10) for inserting the top end of the unit (3); the unit (2) is a plate body, and is provided on the upper edges of the two sides thereof. Reinforcing the wall (21), and the U-shaped matching groove (22) is provided at the center of the upper plate surface for inserting the bottom end of the unit (3); the unit (3) is a vertical plate body, respectively, through the top end and the bottom end thereof respectively The matching grooves (12) and (22) of the unit (1) and the unit (2) are welded and fixed into a whole vehicle aluminum alloy girders. As shown in the fifth embodiment shown in FIG. 9 and FIG. 1G, the girders are composed of three in-situ alloy extrusion units (1), (2), and (3) stacked and welded, and the lower surface of the unit (1) is provided with a The above U-shaped matching groove (12) is inserted into the opposite ends of more than one unit (3); the single M313094 element (2) is a plate body, and more than one U-shaped matching groove is provided on the upper plate surface thereof ( 22) The bottom end of one or more units (3) are respectively inserted into the mating; the unit (3) is a vertical board body, and the matching groove of the unit (1) and the unit (2) via the top end and the bottom end respectively (12) And (22) welding and fixing the aluminum alloy girders of the vehicle having more than one vertical wall. According to the sixth embodiment shown in FIG. 11 and FIG. 12, the girders are composed of three aluminum alloy extruded units (1), (2), and (3) stacked and welded, and the unit (丨) lower plate More than one vertical plate body (10) is extended downward, and the bottom end of each vertical plate body (10) is provided with a U-shaped symphonic groove (12) for inserting the top end of the unit (3); the bottom of the unit (2) is a plate body having no more than one vertical plate body (2 inches) extending upwardly from the upper plate surface thereof, and the top end of each vertical plate body is provided with a mouth-shaped matching groove (22) for inserting the bottom end of the unit (3); 3) It is a vertical plate body, which is welded to the matching groove (12) and (22) of the unit (1) and the unit (2) through the top and bottom ends thereof respectively to form a vehicle aluminum alloy girders having more than one vertical wall. . % is the seventh embodiment shown in Fig. 13 and Fig. 14, wherein the girders are composed of two aluminum alloy extruded units (1) and (2) welded together, and the center of the upper surface of the unit (2) is extended upward. The spring stretches the vertical plate body (20), the top end of the vertical plate body (20) is provided with a u-shaped matching groove (22) for the unit q) to be inserted and joined; the unit (1) is a plate body above the lower plate surface The central integrally formed vertical plate body (10), the bottom end of the vertical plate body (1〇) can be inserted into the matching groove (22) of the unit (2), and is fixed by welding to form an integral vehicle alloy girders. As shown in Figure 15 and the eighth actual _, the girders are composed of three Ming alloy extrusion units (1), (2), and (3) stacked and welded, and the unit (2) is superposed on the upper surface. The central body extends upwardly to the vertical plate body (20), and the top end of the vertical plate body (2〇) is provided with the bottom end of the matching groove supply unit (3), and the unit (1) is a horizontal plate body, the center of the plate body and the unit (7) Top M313094 • The end phase welding ride, while the unit (3) is a vertical plate body, which is welded and fixed by the bottom end and the matching groove (22) of the part 2), and then becomes an integral vehicle aluminum alloy beam. . As shown in Fig. 17 and the ninth embodiment, the girders are composed of two cement-extruded units (1) and (2) welded together, and the lower edge of the unit (1) is provided with a reinforcing wall (11). a vertical plate body (1〇) is extended downward in the center of the lower plate surface, and a plate body is arranged below the unit (2), and a reinforcing wall (21) is arranged on the upper edges of the two sides, and the center of the upper plate surface is integrally formed vertically. The plate body (20), the top end of the vertical plate body (20) is provided with a mouth-shaped matching groove (22) for the unit (1) vertical plate body (10) inserted into the joint, and is welded to form an integral vehicle aluminum alloy beam. According to the tenth embodiment shown in Figs. 19 and 20, the girders are composed of three aluminum alloy extruded units (1), (2), and (3) stacked and welded, and both sides of the unit (2) The upper edge is provided with a reinforcing wall (21), and a vertical plate body (2〇) extends upward from the center of the upper plate surface, and a U-shaped matching groove (22) is provided at the top end of the vertical plate body (2〇) for the bottom end of the unit (3) Insertion and merging; the unit is a horizontal plate body, the middle and the center of the plate body are welded and fixed to the top of the unit (3), and the unit (3) is a vertical plate body, and the bottom end of the plate is aligned with the unit (2). (22) After welding and fixing, it will become an integral vehicle aluminum alloy. ~ As shown in Fig. 21 and Fig. 22, the girders are composed of two aluminum alloy extruded units (1) and (2) welded together, and the unit (1) is a door type plate. The bottom end of the vertical plate on both sides of the plate body is inserted into the matching groove (22) of the unit (2); the upper plate of the unit (2) is extended upwards by more than one vertical plate body (20), and each vertical plate body (20) The top end is provided with a U-shaped matching groove (22) for the unit (1) to be inserted into the butt welded to form a vehicle-shaped alloy girders having more than one vertical wall. According to the twelfth embodiment shown in Figs. 23 and 24, the girders are composed of three aluminum alloys 9 M313094 • gold extrusion type units (1), ¢ 2), and (3) phase stacking and welding. (1) The lower plate surface is provided with more than one u-shaped matching groove (12) for inserting the top ends of one or more units (3) respectively, and a plate body below the unit (2), extending upward on the upper plate surface thereof More than one vertical plate body (20), one end of each vertical plate body (20) is provided with more than one U-shaped matching groove (22). • One or more units (3) are respectively inserted into the bottom end of the unit; 3) It is a vertical plate body, which is welded to the matching groove (12) and (22) of the unit (1) and the unit (2) through the top and bottom ends thereof respectively to form a vehicle aluminum alloy girders having more than one vertical wall. . • According to the thirteenth embodiment shown in Fig. 25 and the figure, the girders are composed of three aluminum alloy extruded units (1), (2), and (3) stacked and welded, and the unit (1) The U-shaped matching groove (12) is provided at the center of the lower plate surface for inserting the top end of the unit (3); the lower part of the unit (2) is a plate body, and the vertical plate body (20) is extended upward in the center of the upper plate surface, the vertical plate The top of the body (2〇) is provided with a U-shaped matching groove (22) for inserting the bottom end of the unit (3); the unit (3) is a vertical plate body, and the unit (1) is distinguished by the top end and the bottom end thereof. And the matching grooves (12) and (22) of the unit (2) are welded and fixed into a whole vehicle aluminum alloy girders. 10 According to the fourteenth embodiment shown in Figs. 27 and 28, the girders are composed of three in-situ alloy extrusion units (1), (2), and (3) stacked and welded, and the unit (1) The lower edge of the two sides is provided with a reinforcing wall (11), and the center of the lower plate surface is provided with a mouth-shaped matching groove (12) for inserting the top end of the unit (3), and a plate body is below the unit (2). The upper edge of the upper side is provided with a reinforcing wall (21), and the center of the upper plate surface extends a vertical plate body (2〇), and the top end of the vertical plate body (2〇) is provided with a U-shaped matching groove (22) for the bottom of the unit (3) The end is inserted into the pair; the unit (3) is a vertical plate body, and the vehicle aluminum is welded and fixed integrally with the matching groove (12) and (22) of the unit (1) and the unit (2) via the top end and the bottom end, respectively. Alloy girders. 10 M313094 '- As for the fifteenth remuneration shown in the 29th and _th sheets, the two liangliangqin alloy extrusion units (1) and (2) are combined with each other and are arranged on the lower edge of both sides of the unit (1). There is a reinforcing wall (11), and a vertical plate body (10) is integrally formed in the center of the lower plate surface, and a bottom end of the vertical plate body (10) can be inserted into the matching groove (22) of the unit (2); the unit (2) is a plate body A U-shaped matching groove (22) is provided at the center of the upper plate surface for the other-unit (1) to be inserted into the butt joint, and is welded to form an integral aluminum alloy girder of the vehicle. As shown in the 31st and the micro @, the girders are composed of two inscriptions • the gold extrusion type unit (1) and (2) are welded together, and the lower edge of the unit (1) is provided with a reinforcing wall. (11), and a vertical plate body (10) is integrally formed in the center, and the bottom end of the vertical plate body (1〇) can be inserted into the matching groove (22) of the unit (2); the unit (2) is a plate body, The upper edge of the two sides is provided with a reinforcing wall (21), and a center of the upper plate surface is provided with a u-shaped matching groove (22) for the vertical plate body of the unit (1) to be inserted into the joint, and is fixed by the joint. The overall vehicle aluminum alloy girders. Based on the above various embodiments, it can be seen that the case can be developed and manufactured by several fixed units, and can be used in a diversified combination, which is not only low in cost, but also has great economic benefits, and has extensive industrial utilization value at the same time. In this case, the improvement of the creative design, the new patent should have a new, progressive and practical industrial utilization. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a first embodiment of the present creation. Brother 2, Figure 1 of the big picture of the brother.苐3Fig. The second embodiment of the present creation. Dimensions of the girders of the figure 4, 苐3. Figure 5: The third embodiment of the present creation. 11 M313094 Fig. 6: Sectional view of the girder in Figure 5. Figure 7: The fourth embodiment of the present creation. Figure 8: Sectional view of the beam of Figure 7. Figure 9: The fifth embodiment of the present creation. Figure 10: Sectional view of the beam of Figure 9. Figure 11: The sixth embodiment of the present creation. Figure 12: Sectional view of the beam of Figure 11. > Fig. 13: The seventh embodiment of the present creation. Figure 14: Sectional view of the beam of Figure 13. Figure 15: The eighth embodiment of the present creation. Figure 16: Sectional view of the girders in Figure 15. Figure 17: The ninth embodiment of the present creation. Figure 18: Sectional view of the girders in Figure 17. Figure 19: The tenth embodiment of the present creation. Figure 20: Sectional view of the beam of Figure 19. Figure 21: The eleventh embodiment of the present creation. Figure 22: Sectional view of the beam of Figure 21. Figure 23: The twelfth embodiment of the present creation. Figure 24: Sectional view of the beam of Figure 23. Figure 25: The thirteenth embodiment of the present creation. Figure 26: Sectional view of the beam of Figure 25. Figure 27: The fourteenth embodiment of the present creation. 12 M313094 Fig. 28·· Fig. 27 is a sectional view of the girder. Fig. 29 is a fifteenth embodiment of the present creation. Figure 30: Sectional view of the girders in Figure 29. Fig. 31 is a sixteenth embodiment of the present creation. Fig. 32 is a sectional view of the beam of Fig. 31. [Main component symbol description] 11 reinforcing wall 20 vertical plate body 3 unit 1 unit 10 vertical plate body > 12 matching groove 2 unit 21 reinforcing wall 22 matching groove

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Claims (1)

M313094 IX. Application for Patent Park: L—The improved vehicle beam structure is composed of at least two of her alloy extrusion units (1) and (2) welded together, at least one (10) pair of at least one of the units. The slot is for the other-unit to insert the pair of welded joints into a whole _car-reduced alloy girders.曰• 2· The modified vehicle girder structure according to the first application of the patent scope, wherein the girders are composed of two Ming alloy extrusion units (1) and (7) welded together, and the unit (7) extends upwardly from the center of the upper surface of the plate. 'The top of the vertical plate body is provided with a button-shaped matching groove for the unit (1) # inserting and merging; the upper part of the unit (1) is a plate body, and a vertical plate body is integrally formed at the center of the lower plate surface. The bottom end of the vertical plate body can be inserted into the unit (2 In the matching groove, the aluminum alloy girders of the vehicle are fixed by welding. 3. According to the scope of application for patents! The improved vehicle girder structure, wherein the large standard is composed of two gamma alloy extrusion units (1) and (2) welded together, and the lower edge of the unit (1) is provided with a reinforcing wall ′ extending downward from the center of the lower plate surface. Vertical plate body; below the I yuan (2) is a plate body 'on both sides, the edge is provided with a reinforcing wall, and the center of the upper plate surface is integrally formed into a straight plate body, _ the vertical plate body is provided with a ^-shaped matching groove The vertical plate body of the unit (1) is inserted into the butt and is fixed by welding into an integral aluminum alloy gird of the vehicle. 4. Improved vehicle girder structure according to the scope of the application patent scope. The girders are composed of two aluminum alloy extrusion units (1) and (2) welded together, and the unit 〇 is a door plate body, plate body The bottom ends of the vertical plates on both sides are inserted into the matching grooves of the unit (2); the upper plate of the unit (2) extends more than one vertical plate body, and the top end of each vertical plate body is provided with a U-shaped matching groove for the unit. (1) Inserting a butt weld to form a vehicle aluminum alloy girders having more than one vertical wall. 14 M313094 5. According to the improved vehicle girder structure described in the first paragraph of the patent application, the large standard is composed of two Ming alloy extrusion units (1) and (3) welded together, and the reinforcing wall is provided at the lower edge of both sides of the unit (1). The bottom plate is centrally formed into a vertical plate body, and the bottom end of the vertical plate body can be inserted into the matching groove of the unit (2); the unit (2) is a plate body having a u-shaped center in the center of the upper plate surface thereof — The groove is for the other unit (1) to be inserted into the butt and welded to form the integral vehicle-like alloy large-beam. 6. According to the modified vehicle large raft structure described in item i of the patent application scope, the large standard system consists of two joints of the two alloys (1) and (2) welded together, and the lower edge of the unit (1) is provided with a reinforcing wall. In the center-body forming-vertical plate body, the bottom end of the vertical plate body can be inserted into the matching groove of the unit (7); the unit (2) is - the plate body is provided with reinforcing walls on the upper edges of the two sides, and the center of the upper plate surface is provided The vertical plate body of the U-shaped matching groove supply unit (1) is inserted and joined, and is fixed by welding into an integral vehicle aluminum alloy girders. 7. An improved vehicle beam structure consisting of at least two or more aluminum-joining units (1), (2), and (3) stacked and welded, at least two of which (1), At least one (10) matching groove supply unit (3) is inserted into the vehicle aluminum alloy girders that are consolidated and integrated into one. 8. The improved vehicle girder structure according to claim 7 of the patent application scope, wherein the girders are composed of three Ming alloy extruded units (1), (2), and (3) stacked and welded, and the unit (1) is in the center of the lower plate surface. The lower end of the vertical plate body of the vertical plate body is provided with a U-shaped matching groove for inserting the top end of the unit (3); the upper part of the upper surface of the unit (2) is provided with an upward vertical plate body, and the top end of the vertical plate body The bottom end of the unit (3) is inserted into the butt joint; the unit (3) is the vertical plate body 'welded by the top and bottom ends of the unit (1) and the unit (2) respectively. 15 M313094 The overall aluminum alloy girders are formed. 9. The improved vehicle girder structure according to the scope of claim 7 of the patent application, wherein the large scorpion is composed of three Ming alloy extrusion units (1), (2), and (3) stacked and welded, and the unit (1) is under both sides. The edge is provided with a reinforcing wall, and the center of the lower plate surface extends downwardly to the vertical plate body, and the bottom end of the vertical plate body is provided with a U-shaped matching groove for inserting the top end of the unit (3); the lower part of the unit (2) is a plate body. A reinforcing wall is arranged on the upper edges of the two sides, and an upward vertical plate body is arranged at the center of the upper plate surface, and a U-shaped matching groove is provided at the top end of the vertical plate body for inserting and merging the bottom end of the unit (3); 3) It is a vertical plate body, and the vehicle aluminum alloy girders are welded and fixed to the unit by the top and bottom ends of the unit (1) and the unit (2). 10. The improved vehicle girder structure according to claim 7, wherein the girders are composed of two aluminum alloy extruded units (1), (2), and (3) stacked and welded, unit 〇) The center of the lower plate surface is provided with a U-shaped matching groove for inserting the top end of the unit (3); the center of the upper surface of the unit is provided with a U-shaped matching groove for inserting the bottom end of the unit (3); the unit (3) is The vertical plate body is welded to the opposite groove of the unit (1) and the unit (2) through its top and bottom ends, and is fixed to form a large alloy of the vehicle. 11 · The improved vehicle girder structure according to the scope of claim 7 of the patent application, wherein the girders are composed of three stacked alloy extrusion units (1), (2), and (3), which are stacked and welded, and the unit (1) The lower edge of the two sides is provided with a reinforcing wall, and the center of the lower plate surface is provided with a mouth-shaped matching groove for inserting the top end of the unit (3); the unit (2) is a plate body, and reinforcing walls are arranged on the upper edges of the two sides. The center of the upper plate is provided with a U-shaped matching groove for inserting the bottom end of the unit (3); the unit (3) is a vertical plate body, and the pair of the top and bottom ends of the upper plate and the bottom end are respectively connected with the unit (1) and the unit (2). The joint groove is spliced and fixed into a vehicle aluminum alloy girders. 16 M313094 • The improved vehicle girders according to the 7th paragraph of the stipulated patent scope, wherein the girders are composed of two pairs of alloy extrusion units (1), (2) and (3), which are stacked and matched, and the lower part of the unit (1) There are more than one _-shaped matching groove for inserting the top ends of one or more units (3) respectively, and the unit (2) is a plate body, and one or more mouth-shaped matching grooves are provided on the upper plate surface for more than one unit (3) The bottom end is inserted into the opposite end; the unit (3) is a vertical plate body, and the top end and the bottom end are respectively welded to the matching groove of the unit (1) and the unit (2) to form a vehicle having more than one vertical wall. Aluminum alloy girders. • 13. The modified vehicle girder structure according to the scope of claim 7 of the patent application, wherein the girders are composed of two alloy-extruded units (1), (2), and (3) stacked and welded, and the unit (1) is plated. The lower side of the vertical plate body is provided with a button-shaped opposite groove for the top end of each vertical plate body to be inserted into the right side of the unit (3); the lower part of the unit (2) is a plate body, and the upper plate faces upwardly. There is also a vertical plate body on the jSUX, a U-shaped matching groove is arranged at the top end of each vertical plate body for inserting the bottom end of the single butterfly; the unit (3) is a vertical plate body, and the unit (1) and the unit are respectively connected through the top end and the bottom end thereof. (2) The butt joint is welded to form a vehicle Φ aluminum alloy girders having more than one vertical wall. 14. The improved vehicle girders structure according to claim 7 of the scope of the patent application, wherein the large standard system is composed of three alloy-extruded units (1), (2), and (3) stacked and welded to form a unit (7) Extending the vertical plate body, the top end of the vertical plate body is provided with a button-shaped matching groove for the early twisting (3) the bottom end is inserted and joined; the unit (1) is a horizontal plate body, and the center of the plate body is welded and fixed to the top end of the unit (3), and the unit _ is a vertical plate body, which is welded and fixed by the bottom end of the unit and the matching groove of the unit (2), and becomes an integral vehicle alloy girders. 15. The improved vehicle girder structure according to the scope of claim 7 of the patent application, wherein the large standard system 17 M313094 consists of a stacking butt welding of the (1), (2), and (3) phases of the t-gold extrusion type unit, 2) Two! There is a vertical plate body extending upward from the center of the plate surface of the reinforcing wall, and the vertical plate body is provided with (10) matching groove for the bottom end of the Hungarian insertion; the unit (1) is the center of the horizontal plate body and the unit_end With the coffee, and the unit _ is _ body, after the bottom - shirt (2) _ bribes turned over, the bribes of the vehicle age gold standard. The modified vehicle large raft structure described in the seventh application of the patent application, wherein the large standard is composed of two alloy-extruded units (1), (2), and (3) stacked and welded, and the unit (1) The surface is provided with more than one u-shaped matching groove for inserting the top ends of one or more units (3) respectively; the lower part of the unit (2) is a plate body, and more than one vertical plate body is extended on the upper surface of the upper plate. The top of the plate body is provided with more than one u-shaped matching groove for more than one unit (3), and the unit (3) is perpendicular to the vertical body, and the unit (1) and the unit (2) are respectively connected through the top end and the bottom end thereof. The mating groove is spliced into a vehicle aluminum alloy girders having more than one vertical wall.改良. The improved vehicle girder structure according to the scope of claim 7 of the patent application, wherein the large scorpion system is composed of three Ming alloy extrusion units (1), (2), and (3) stacked and welded, and the unit (1) is in the middle of the lower plate surface. The U-shaped matching groove is provided for inserting the top end of the unit (3); the lower part of the unit (2) is a plate body, and the vertical plate body is extended upward in the center of the upper plate surface, and the top end of the vertical plate body is provided with a mouth-shaped matching groove for The bottom end of the unit (3) is inserted into the butt joint; the unit (3) is a vertical plate body, and the top and bottom ends of the unit are respectively welded to the matching groove of the unit (1) and the unit (2) to form an integral vehicle aluminum alloy girders. 18. The improved vehicle girder structure according to claim 7, wherein the girders are composed of three aluminum alloy extruded units (1), (2), and (3) stacked and welded, and the unit (1) 18 M313094 has a reinforcing wall on the lower edge of the two sides, and the center of the lower plate is inserted into the center to the top; the single stealing is - money, in the thin upper plate, the Dingyuan axis: slot; the unit (3) the bottom is inserted into the joint The unit (3) is a vertical plate body, and is welded and fixed to the vehicle-shaped alloy girders of the unit (1) and the early element (2) through the top and bottom ends thereof respectively. 19