CN215752633U - Combined longitudinal beam type integrated aluminum alloy frame - Google Patents

Abstract

The utility model provides a combination longitudinal beam formula integration aluminum alloy frame, two combination longerons are arranged to frame longitudinal direction, it comprises front longitudinal and back longeron, both form one section overlapping combination district, a plurality of battery compartment are arranged to the frame transverse direction, at least one transverse battery compartment wears the overlapping combination district that the tenon passes through two combination longerons, and be connected with the cooperation of front and back longeron, the battery compartment surface passes through the flange limit and is connected with the side of combination longeron, a plurality of crossbeams are arranged to frame upper portion and lower part transverse direction, the upper and lower cavity of crossbeam and combination longeron wears the tenon joint, a plurality of little longerons are arranged to the frame longitudinal direction, little longeron and crossbeam tenon fourth of the twelve earthly branches alternate, little longeron and battery compartment surface contact are connected. The utility model is optimized and improved on the basis of the original front generation frame, adopts the combination longitudinal beam to be connected with the battery bin through tenon to form a frame main structure, has high torsional rigidity, can conveniently adapt to different installation widths of front and rear leaf springs of the frame by adjusting the relative distance of the front and rear longitudinal beams, and has high frame production efficiency and low production cost.

Description

Combined longitudinal beam type integrated aluminum alloy frame

Technical Field

The utility model relates to the technical field of new energy automobile manufacturing, in particular to a combined longitudinal beam type integrated aluminum alloy frame.

Background

The traditional commercial vehicle steel structure frame generally adopts a trapezoidal structure, namely, the frame consists of two steel longitudinal beams and a group of steel cross beams, and then the longitudinal beams and the cross beams are connected by using a riveting method or a welding method to form a firm rigid structure. There is a series of hard spot mounts on the frame which are typically bolted, riveted or welded to the frame. The hard point support is used for transmitting the load of a chassis system to a frame, wherein the hard point support is a front leaf spring hard point support and a rear leaf spring hard point support, which are stressed most, the widths of the front part and the rear part of each of the two steel longitudinal beams are different due to the difference of the widths of the front leaf spring and the rear leaf spring, so that the steel longitudinal beams are manufactured into a bent shape with front and rear sections offset and parallel through a bending process, and after the steel longitudinal beams are assembled, a double-longitudinal-beam trapezoidal structure with a narrow front part and a wide rear part is formed. The steel structure trapezium structure frame is mature and reliable, but has a series of defects: 1) the weight of the frame is larger; 2) the utilization rate of the internal space of the frame is not high; 3) the corrosion resistance is poor, firstly, the steel structure is easy to rust, and secondly, electrochemical corrosion is easy to occur at the contact part of the steel and the aluminum.

In the field of new energy automobiles, in order to greatly reduce the weight of the whole automobile, the light weight of a frame structure (including a hard point support) is important because the ratio of the frame weight to the automobile body weight is larger; however, the light weight difficulty of the frame is far higher than that of the vehicle body, and the main reasons are as follows: 1) the frame is a stress foundation of the whole vehicle, and has high mechanical requirements, particularly high requirements on torsional rigidity and bending rigidity; 2) various chassis systems (such as front and rear axles) and facilities (such as battery packs) are assembled on the frame, and the frame must provide reasonable installation space or working space for related systems and facilities, so that space interference or difficulty in assembly is avoided; 3) the load of various systems on hard points (fixed points) on the frame is large, and a firm and stable hard point structure must be provided. Although aluminum alloys are a good lightweight material, there are also obvious short plates: 1) compared with steel, the aluminum alloy has weaker strength; 2) difficult welding, and the welding seam will cause the strength of the material to be reduced remarkably; 3) the 'straight going' is not easy to bend, and is particularly difficult to bend for large section profiles. Therefore, the aluminum alloy frame structure has great difference from the traditional steel structure frame, and the aluminum alloy frame is not simply used for replacing steel. For the reasons mentioned above, all aluminum alloy frame designs belong to the "unmanned area", and there is no mature solution for aluminum alloy frames to date.

The following publications are found in relation to aluminum alloy frames for vehicles: key word, frame and aluminium alloy

1. A two-longitudinal four-transverse aluminum alloy frame structure and an automobile; application No.: CN 201821389751.7; the applicant: wuhan Intelligent control Industrial technology research institute, Inc.; abstract: a two-longitudinal-four-transverse aluminum alloy frame structure and an automobile belong to the technical field of automobiles. The aluminum alloy frame structure with two longitudinal beams and four transverse beams comprises two longitudinal beams and four combined transverse arms. The two longitudinal beams are arranged in bilateral symmetry. Four combination xarm from the front to back in proper order mortise-tenon joint on the longeron. The automobile comprises the aluminum alloy frame structure with two longitudinal sides and four transverse sides. The aluminum alloy frame structure with two longitudinal sides and four transverse sides has the advantages that the aluminum alloy frame structure with two longitudinal sides and four transverse sides is light in weight, good overall rigidity and strength are guaranteed, the aluminum alloy frame structure is easy to manufacture, and an aluminum alloy chassis hard spot system is easy to install. The automobile has high light weight.

2. An aluminum alloy automobile chassis hard spot system and an automobile; application No.: CN 201810985616.7; the applicant: wuhan intelligent control Industrial technology research institute, Inc., abstract: an aluminum alloy automobile chassis hard spot system and an automobile belong to the technical field of automobiles. The device comprises a frame, a front plate spring front support, a front plate spring rear support, a rear plate spring front support, a rear plate spring rear support, a motor hard point support and a steering hard point support. The frame comprises a left longitudinal beam, a right longitudinal beam, a first combined cross arm, a second combined cross arm, a third combined cross arm and a fourth combined cross arm, wherein the four cross arms are sequentially connected in a mortise-tenon manner from front to back and are fixed on the left longitudinal beam and the right longitudinal beam. The front support of the front leaf spring is connected with the first combined cross arm. And the rear support of the front plate spring is connected with the second combined cross arm. The front support of the rear plate spring is connected with the third combined cross arm. And the rear seat of the rear plate spring is connected with the fourth combined cross arm. The motor hard point support is fixed between the left longitudinal beam and the right longitudinal beam. The motor hard point support is fixed on the left longitudinal beam or the right longitudinal beam. The hard spot system of the aluminum alloy automobile chassis realizes light weight and has good hard spot rigidity and strength.

3. A pure electric vehicle chassis system adopting a lightweight passenger car chassis structure; application No.: CN 201410847147.4; the applicant: dongguan Zhongshan university research institute, Dongguan Sanxin electric automobile technology Co., Ltd, abstract: a pure electric vehicle chassis system adopting a light-weight passenger car chassis structure comprises two longitudinal girders and a plurality of cross beams, wherein the cross beams are distributed on different height layers and different longitudinal positions of the two longitudinal girders, and the cross beams are in tenon joint with the two longitudinal girders to form a double-longitudinal-beam multilayer chassis frame stressed integrally; the front part of the double-longitudinal-beam multilayer chassis frame is connected with a front bridge, and the front bridge is fixed through two longitudinal beams; the rear part of the double-longitudinal-beam multilayer chassis frame is connected with a rear bridge; the rear bridge frame is fixed through two longitudinal girders; the front bridge frame is connected with a front axle assembly, the rear bridge frame is connected with a rear axle assembly, the double-longitudinal-beam multi-layer chassis frame is provided with a driving assembly and an energy assembly, the integral structure rigidity of the longitudinal girder is good, the assembling process of the front bridge frame, the rear bridge frame and the chassis frame is simplified, the connection is firm, the integral stress is realized, the multi-layer floor structure design is convenient for the installation of batteries and motors, and the chassis space is saved.

4. A lightweight frame that mimics the topology of a honeycomb structure; application No.: CN 202010828647.9; the applicant: huazhong university of science and technology, Nanning Hua digital lightweight electric vehicle design institute, Inc., abstract: the utility model provides a lightweight frame of imitative honeycomb structure topology which characterized in that: the device comprises two boundary beams, at least one longitudinal beam and at least two middle cross beams; the longitudinal beam is positioned between the two edge beams, two ends of the middle cross beam are respectively in joggle joint with the edge beams, and the middle part of the middle cross beam is in joggle joint with the longitudinal beam; the side beams, the longitudinal beams and the middle cross beam respectively comprise webs with I-shaped middle sections, and upper pipes and lower pipes with rectangular upper end sections and rectangular lower end sections; the side beams, the longitudinal beams and the middle cross beam form a battery compartment which can be used for accommodating a storage battery. The vehicle frame adopting the multi-cabin honeycomb structure is light in weight, has high strength and rigidity, and can realize double functions of bearing and reducing weight.

The previous generation designs performed by the applicant show the process of frame from incomplete aluminum alloy lightening to complete aluminum alloy lightening. However, two "all aluminum alloy frames" still have some problems: 1) because the longitudinal beams are integrally designed, in order to adapt to different widths of hard points of front and rear leaf springs, more complicated longitudinal beam design and combined cross beam design are made, so that the overall structure of the frame is more complicated, the assembly difficulty is increased, the cost is higher, and the subsequent whole vehicle assembly is inconvenient (such as application numbers CN201821389751.7 and CN 202010828647.9); 2) the hard point load of the plate spring is borne by the combined cross arm, and the effect is not good in mechanical effect directly borne by the longitudinal beam (such as application numbers CN201821389751.7 and CN 202010828647.9); 3) the integration degree of the battery space is not high, the battery pack of application number CN201821389751.7 is arranged on the outer side of the integral girder, and in order to ensure the electric quantity of the battery, the height of the battery pack can only be increased, so that the battery pack protrudes out of the upper surface of the girder, occupies the passenger space in the vehicle and damages the flatness of the floor in the vehicle; the application number CN202010828647.9 can store a large number of battery packs, but each battery space unit is small, so that the number of the battery packs is large, and the assembly process and wiring are complex; 4) the transverse structure of the frame is weak, and the transverse bending rigidity and the torsional rigidity of the frame are weak due to the fact that the transverse structure is a series of small-section sectional materials and is weak in stress capacity. Therefore, it is necessary to continue iterative optimization for the above-described deficiency.

Disclosure of Invention

The combined longitudinal beam type integrated aluminum alloy frame is optimized and improved on the basis of the original front-generation aluminum alloy frame, the combined longitudinal beams are connected with the battery bin through tenons to form a main structure topology, the transverse distance between the front longitudinal beams of the two combined longitudinal beams is unequal to the transverse distance between the rear longitudinal beams and is respectively matched with the widths of the front leaf spring and the rear leaf spring, the frame is high in overall structure rigidity and torsional strength, the connection form is free of large-area welding and is not prone to failure and cracking, the section structure of the section is reasonable and easy to produce, the production cost of the frame can be greatly reduced, and the production efficiency is improved.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

the utility model provides a combination longitudinal beam formula integration aluminum alloy frame, two combination longerons about frame longitudinal arrangement, it comprises front longitudinal beam and back longeron, both horizontal offsets, and vertically form one section overlapping combination district, a plurality of battery compartment are transversely arranged to the frame, the overlapping combination district of two combination longerons about at least one horizontal battery compartment wears the tenon simultaneously, furthermore, be connected through flange limit and the side of combination longeron in the battery compartment outer surface, a plurality of crossbeams are transversely arranged to frame upper portion and lower part, the upper and lower cavity of crossbeam and combination longeron wears the tenon to be connected, a plurality of little longerons are longitudinally arranged to the frame, little longeron and crossbeam tenon fourth of the twelve earthly branches alternate, little longeron and battery compartment surface contact are connected.

The cross section of the longitudinal beam is a vertically arranged 6 cavity section bars, the design is easy to produce, and the longitudinal beam has the characteristics of double web members and has stronger bending resistance and twisting resistance effects. The front longitudinal beam, the rear longitudinal beam and the battery compartment form a crossed main structure topology, so that the structural rigidity and the torsional strength are very high, the distance between the two rear longitudinal beams can be adjusted within a certain range after the longitudinal beams are combined, the adaptability adjustment of the installation positions of the plate spring supports and other hard point supports on the longitudinal beams is greatly facilitated, the longitudinal beams are not required to be bent, and the manufacturing cost of the frame is greatly reduced. The edge of the tenon penetrating through the combined longitudinal beam and the battery compartment comprises a horizontal longitudinal direction and a vertical direction, and angle aluminum type flange edges are fixed for riveting and fixing and are connected with the battery compartment from two directions; in addition, the flange edge at the intersection of the edge-receiving beam and the small longitudinal beam has a good fixing effect on the battery compartment for bearing the battery, and the battery compartment can be kept not to deform and shift under the high-speed inertia state.

The upper surface of the frame is provided with a floor skin, and the skin is fixedly connected with the longitudinal beam, the small longitudinal beam, the edge-closing beam and the cross beam which are in contact through laser penetration welding or through bonding and riveting.

And two ends of the cross beam are respectively provided with a side beam, and the side beams are connected with the end part of the cross beam in a mortise and tenon manner. The cross section of the trimming beam section is a square tube, and the outer side of the trimming beam is connected with the side wall trimming beam through a bolt.

And the surfaces of the small longitudinal beam, the edge-closing beam and the battery compartment are respectively provided with a flange edge for connection and fixation.

The battery compartment is formed by combining two parts of trough-shaped plates, and the connecting parts of the two trough-shaped plates are provided with I-shaped connecting pieces for connection. The double-plate splicing structure can realize cavity molding with a large cross section, does not need a large-tonnage extruder for production, and reduces the production cost.

Slots are arranged at the intersection of the tenon penetrating positions of the sections of the combined longitudinal beam and the cross beam profile, and triangular plates are fixedly connected at the slots.

The overlapping combination area of the front longitudinal beam and the rear longitudinal beam is provided with a horizontal connecting plugboard, and the edge parts at two sides of the connecting plugboard are respectively fixedly connected with the side slots of the front longitudinal beam and the rear longitudinal beam. The front longitudinal beam and the rear longitudinal beam are fixedly positioned mainly through the connection effect of the cross beam, on the basis, the connecting insertion plate is additionally arranged between the front longitudinal beam and the rear longitudinal beam, connecting nodes between the front longitudinal beam and the rear longitudinal beam are further increased, in actual production, after the front longitudinal beam and the rear longitudinal beam are produced to the fixed length, the front longitudinal beam and the rear longitudinal beam are fixedly positioned by the connecting insertion plate to form a combined longitudinal beam, and then the combined longitudinal beam is connected with the cross beam, a battery tunnel cavity and the like.

The utility model has the advantages that:

the integral longitudinal beam is decomposed into the longitudinal beams at two ends which are offset and overlapped front and back, the longitudinal beams are in mortise and tenon connection with the battery bin structure in the overlapping combination area, and then the longitudinal beams, the transverse beams and the side beams are fixed through flange edge bonding and riveting, further, the floor covering is connected and fixed with the longitudinal beams, the transverse beams and the side beams on the frame which are in contact with the floor covering through laser penetration welding or bonding and riveting, and a mortise cavity beam type frame structure is obtained, so that a series of advantages are brought:

1. due to the fact that the longitudinal beam and the battery compartment are large in section size and large in section inertia moment, a frame main structure consisting of the girder and the large cavity provides a strong structural foundation, and the full-aluminum alloy lightweight frame structure with high mechanical property is finally obtained through connection between various small beams and the main structure and connection coupling between floor skin and the frame structure. The calculation and test results show that the torsional rigidity of the frame exceeds 30000 Nm/degree and is higher than that of similar steel frames.

2. The distance between the front section and the rear section of the combined longitudinal beam can be flexibly adjusted, the flexibility of adapting to the width of the front leaf spring support and the rear leaf spring support is provided, and the frame is widely applied.

3. The combined longitudinal beam avoids bending the integral longitudinal beam, and meanwhile, the frame structure only needs to be simply inserted and fixed in a mortise and tenon mode during assembly, so that the manufacturing process of the frame is simple, and the manufacturing cost is obviously reduced.

4. The battery compartment is a main topological structure of the frame and is an installation space of the battery pack, so that the space of the frame is fully utilized, and the battery pack is convenient to install.

5. Various hard point structures can be directly assembled on the frame girder, and the frame girder has the advantages of strong bearing capacity, good assembly and low process cost.

6. The lightweight automobile adopting the 'mortise-tenon cavity beam' full-lightweight frame realizes the lightweight effect that the whole automobile is lightened by more than 30%.

Description of the drawings:

FIG. 1 is a view showing the structure of the external appearance of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a sectional view of B-B in FIG. 2;

FIG. 4 is an enlarged view of the structure at III in FIG. 3;

FIG. 5 is a view of the cross-section C-C of FIG. 2;

FIG. 6 is a half sectional view of the present invention in a top view;

FIG. 7 is an enlarged view of the point I in FIG. 6;

FIG. 8 is a view showing a positional relationship between a combination of a longitudinal beam, a cross beam and a battery compartment;

FIG. 9 is an enlarged view of the structure at II in FIG. 8;

FIG. 10 is a cross-sectional view of a composite stringer profile;

FIG. 11 is a sectional view of a composite stringer profile of example 3;

FIG. 12 is a view showing a position structure of a triangular plate;

FIG. 13 is a view showing the outer shape of a composite stringer according to embodiment 2;

the number designations in the figures are: 1. combining the longitudinal beams; 11. a front longitudinal beam; 12. a rear stringer; 13. connecting the plugboards; 2. a minor stringer; 3. edge beam folding; 4. a cross beam; 5. a battery compartment; 51. an I-shaped connecting piece; 6. a flange edge; 7. a triangular plate.

Detailed Description

Example 1

The utility model provides a combination longitudinal beam formula integration aluminum alloy frame, two combination longerons 1 about frame longitudinal arrangement, it comprises front longitudinal beam 11 and back longeron 12, both lateral bias, and vertically form one section overlapping combination district, a plurality of battery compartment 5 are transversely arranged to the frame, the overlapping combination district of two combination longerons 1 about at least one transverse battery compartment 5 wears the tenon simultaneously, furthermore, 5 surfaces in battery compartment are connected with the side of combination longeron 1 through flange limit 6, a plurality of crossbeams 4 are transversely arranged to frame upper portion and lower part, crossbeam 4 wears the tenon joint with the upper and lower cavity of combination longeron 1, a plurality of little longerons 2 are longitudinally arranged to the frame, little longeron 2 and the interlude of 4 tenon fourth of crossbeam mortise, little longeron 2 and battery compartment 5 surface contact are connected.

The upper surface of the frame is provided with a floor skin, and the skin is fixedly connected with the longitudinal beam 1, the small longitudinal beam 2, the edge-closing beam 3 and the cross beam 4 which are in contact through laser penetration welding or through bonding and riveting.

The two ends of the cross beam 4 are respectively provided with a side beam 3, and the side beam 3 is connected with the end part of the cross beam 4 in a mortise and tenon manner.

And the surfaces of the small longitudinal beam 2, the edge-closing beam 3 and the battery compartment 5 are respectively provided with a flange 6 for connection and fixation.

The battery compartment 5 is formed by combining two parts of trough-shaped plates, and the connecting parts of the two trough-shaped plates are provided with I-shaped connecting pieces 51 for connection.

The sections of the combined longitudinal beam 1 and the cross beam 4 are provided with slots at the crossing positions of the tenon penetrating positions, and triangular plates 7 are arranged at the slots for fixed connection.

And in the cavity of the section of the combined longitudinal beam 1, a plurality of reinforcing ribs are arranged on two sides of the long cavity.

And a horizontal connecting inserting plate 13 is arranged in an overlapping combination area of the front longitudinal beam 1 and the rear longitudinal beam 12, and the edge parts of two sides of the connecting inserting plate 13 are respectively fixedly connected with side slots of the front longitudinal beam 11 and the rear longitudinal beam 12.

Example 2

The difference from the embodiment 1 is that: the front longitudinal beam 11 and the rear longitudinal beam 12 are connected through a connecting insertion plate 13, the connecting insertion plate 13 is arranged at the overlapping connection part of the front longitudinal beam 1 and the rear longitudinal beam 2, and the end parts of two side surfaces of the connecting insertion plate 13 are fixedly connected with side surface slots of the front longitudinal beam 11 and the rear longitudinal beam 12 respectively. Namely, a flange edge between a front longitudinal beam 1 and a rear longitudinal beam 12 in each large longitudinal beam 1 is eliminated, and a part directly connected with a connecting flashboard 13 is arranged between the longitudinal beam 1 and the rear longitudinal beam 2;

one transverse battery compartment 5 is tenon-inserted through the overlapping combination area of the two combination longitudinal beams 1.

Example 3

The difference from the embodiment 1 is that: and in the cavity of the section of the combined longitudinal beam 1, a plurality of reinforcing ribs are arranged on two sides of the long cavity.

The application example is as follows:

the aluminum profile in the embodiment 1 of the utility model is processed and manufactured by using 6005A-T6 materials, the total length of the frame is 5800mm, and the total width is 1830 mm; the total weight of the frame is 320 kg;

the comparative example is a two-longitudinal four-transverse aluminum alloy frame structure in the document 1 in the background document, and the size of the comparative example frame structure is the same as the external size of the frame of the utility model example 1;

the following comparative data were obtained:

the torsional rigidity test process follows an experimental method in the 'test method for torsional rigidity of white car body of common passenger car' in the draft of solicitation in 2020:

the test device meets the requirements of JB/T7974-1999, a body in white and a simulated suspension are hinged by adopting a ball, 20 test points are symmetrically arranged at the bottom of the body in left and right, and the maximum loading load is one fourth of the maximum loading load of the whole vehicle;

loading to the maximum load along a pointer, unloading, anticlockwise loading to the maximum load, unloading, standing to eliminate elastic deformation, clockwise loading to the maximum load by 30 percent, unloading, anticlockwise loading to the maximum load by 30 percent, unloading, standing to eliminate elastic deformation, clockwise graded loading, unloading to eliminate elastic deformation, anticlockwise loading to the maximum load by 30 percent, unloading, anticlockwise graded loading, unloading to eliminate elastic deformation, repeating the step 6-16 for a plurality of times, at least 2 times.

Calculating the formula: torsional stiffness = absolute value of load borne by the vehicle body/difference in torsion angle across front and rear suspension cross-sections

From the above, it can be seen that the torque capacity of the frame according to the utility model is greatly improved and the overall weight and the overall cost are also considerably reduced compared to the comparative examples.

Claims (8)

1. The utility model provides a combination longitudinal girder formula integration aluminum alloy frame which characterized in that: two combination longerons (1) about frame longitudinal arrangement, it comprises front longitudinal beam (11) and back longeron (12), both horizontal offsets, and vertically form one section overlapping combination district, a plurality of battery compartment (5) are transversely arranged to the frame, the overlapping combination district of two combination longerons (1) about at least one horizontal battery compartment (5) wear the tenon simultaneously, furthermore, pass through flange limit (6) and be connected with the side of combination longeron (1) at battery compartment (5) surface, a plurality of crossbeams (4) are transversely arranged to frame upper portion and lower part, crossbeam (4) are worn the tenon with the upper and lower cavity of combination longeron (1) and are connected, a plurality of little longerons (2) are longitudinally arranged to the frame, little longeron (2) and crossbeam (4) mortise and tenon interlude, little longeron (2) and battery compartment (5) surface contact are connected.

2. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: the floor skin is arranged on the upper surface of the frame, and the skin is welded and fixed with the longitudinal beam (1), the small longitudinal beam (2), the edge-closing beam (3) and the cross beam (4) which are in contact through laser penetration or connected and fixed through bonding and riveting.

3. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: the two ends of the cross beam (4) are respectively provided with a side beam (3), and the side beams (3) are connected with the end part of the cross beam (4) in a mortise and tenon manner.

4. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: the surfaces of the small longitudinal beam (2), the edge closing beam (3) and the battery compartment (5) are provided with flange edges (6) for connection and fixation.

5. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: the battery compartment (5) is formed by combining two parts of groove-shaped plates, and the connecting parts of the two groove-shaped plates are provided with I-shaped connecting pieces (51) for connection.

6. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: slots are arranged at the cross positions of the sectional material sections of the combined longitudinal beam (1) and the cross beam (4) penetrating tenons, and triangular plates (7) are fixedly connected at the slots.

7. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: in the cavity of the section of the combined longitudinal beam (1), a plurality of reinforcing ribs are arranged on two sides of the long cavity.

8. The combined longitudinal beam type integrated aluminum alloy frame as claimed in claim 1, wherein: the overlapping combination area of the front longitudinal beam (1) and the rear longitudinal beam (12) is provided with a horizontal connecting insertion plate (13), and the edge parts of two sides of the connecting insertion plate (13) are fixedly connected with side slots of the front longitudinal beam (11) and the rear longitudinal beam (12) respectively.

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