Chassis system and method of assembling the same

Abstract

The application relates to the field of vehicle bodies, in particular to a chassis system and an assembling method thereof, including a skateboard chassis system and a vehicle body system; the skateboard chassis system comprises a longitudinal beam group, the longitudinal beam group comprises two oppositely arranged longitudinal beams; the vehicle body system comprises a rocker, the rocker is connected with an A column and a front engine compartment longitudinal beam; the skateboard chassis system and the vehicle body system are connected through a connecting structure; the application discloses a chassis system; the traditional front wall plate is divided into an upper front wall plate and a lower front wall plate structure, brake pedals, accelerator pedals and other operation components can be directly installed on the skateboard chassis during subsequent installation and use, so that the skateboard chassis can be independently driven away from the vehicle body; in addition, the front connecting structure, the middle connecting structure and the rear connecting structure are arranged, the stability of the connection between the skateboard chassis system and the vehicle body system is guaranteed, and the structural strength of the chassis system is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle bodies, in particular to a chassis system and an assembling method thereof. BACKGROUND

[0002] With the continuous promotion of high-quality development of the automobile industry, the market requires that the intelligent electric vehicle be updated and replaced at a much faster pace. To this end, automobile manufacturers have begun to adopt body and skateboard chassis decoupling development to meet this challenge.

[0003] The currently released skateboard chassis products mostly use the connection structure of the traditional non-load-bearing body or optimize and improve the structure.

[0004] The connection structure has the following disadvantages:

[0005] 1. This connection structure inevitably arranges many connection points on the front and rear longitudinal beams of the chassis. As the main load-bearing component of the vehicle, the longitudinal beam loses strength when a hole is punched as a fixing point on the longitudinal beam. In order to ensure the strength of the vehicle, additional reinforcement structures must be added around the fixing points of the longitudinal beam, the thickness of the longitudinal beam must be increased, or the longitudinal beam must be made of higher-strength materials, which undoubtedly increases the weight and cost of the vehicle;

[0006] For example, patent 202221690870.2 - vehicle body connection structure and automobile;

[0007] 2. The body is a separate cabin connected to the skateboard chassis. The brake pedal, accelerator pedal, and other operating components are installed on the body, which makes the skateboard chassis itself unable to be driven alone, greatly limiting the application scenarios and range of the skateboard chassis.

[0008] Therefore, in order to solve or improve the above problems, it is necessary to optimize the design of the existing chassis system. SUMMARY

[0009] The purpose of the present application is to provide a chassis system that facilitates the connection between the skateboard chassis system and the body system.

[0010] In order to achieve the above purpose, the technical solution adopted by the present application is:

[0011] A chassis system includes a skateboard chassis system and a body system;

[0012] The skateboard chassis system includes a longitudinal beam group, and the longitudinal beam group includes two oppositely arranged longitudinal beams;

[0013] The body system includes a rocker beam, and the rocker beam is connected with an A-pillar and a front engine compartment longitudinal beam;

[0014] The skateboard chassis system and the body system are connected through a connection structure.

[0015] The connecting structure comprises a front connecting structure, the front connecting structure comprises a first connecting structure arranged on the longitudinal beam group, the first connecting structure comprises a mounting column arranged on the longitudinal beam, and the mounting column is connected with an A column in the vehicle body system.

[0016] Each A column corresponds to a first connecting structure; each longitudinal beam in the longitudinal beam group is provided with a first connecting structure.

[0017] The front connecting structure further comprises a second connecting structure, the second connecting structure comprises a lower front wall arranged on the longitudinal beam group, and the lower front wall is connected with an upper front wall in the vehicle body system.

[0018] The lower front wall is connected with the longitudinal beam group through the first connecting structure on both sides.

[0019] The front connecting structure further comprises a third connecting structure, the third connecting structure comprises a front lower wheel cover arranged on the longitudinal beam, and the front lower wheel cover is connected with a front upper wheel cover in the vehicle body system.

[0020] The connecting structure further comprises a middle connecting structure, the middle connecting structure comprises a rocker beam arranged on the front longitudinal beam; and the rocker beam is connected with a rocker beam in the vehicle body system.

[0021] A positioning mechanism is arranged between the rocker beam and the rocker beam, the positioning mechanism comprises a positioning pin arranged on the rocker beam, and the rocker beam is provided with a positioning hole; the positioning pin in each positioning mechanism is arranged opposite to the positioning hole on the corresponding rocker beam.

[0022] The connecting structure further comprises a rear connecting structure; the rear connecting structure comprises a rear lower wheel cover arranged on the longitudinal beam and a rear upper wheel cover arranged on the rocker beam in the vehicle body system; and the rear lower wheel cover is connected with the rear upper wheel cover.

[0023] An assembling method of a chassis system, the assembling method comprises the following steps:

[0024] Step 1: determining a slide chassis system and a vehicle body system to be assembled;

[0025] Step 2: initially positioning the slide chassis system and the vehicle body system through the positioning mechanism;

[0026] Step 3: after step 2 is completed, connecting the slide chassis system and the vehicle body system through the front connecting structure, the middle connecting structure and the rear connecting structure.

[0027] The present application has the following advantages:

[0028] The application discloses a chassis system; the chassis system is characterized in that a traditional front wall is divided into an upper front wall and a lower front wall, brake pedals, accelerator pedals and other operating components are directly installed on a slide chassis, the slide chassis can be separated from a vehicle body and independently driven, the stability of the connection between the slide chassis system and the vehicle body system is ensured through the arrangement of a front connecting structure, a middle connecting structure and a rear connecting structure, and the structural strength of the chassis system is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] The following is a brief description of the content expressed by each drawing in the specification of the application and the marks in the drawings:

[0030] Figure 1 It is a schematic view of the chassis structure of the application;

[0031] Figure 2 It is a schematic view of the chassis structure of the application;

[0032] Figure 3 It is a schematic view of the chassis structure of the application;

[0033] Figure 4 It is a schematic view of the chassis structure of the application;

[0034] Figure 5 It is an isometric view of the installation column on both sides of the chassis structure of the application;

[0035] Figure 6 It is a schematic view of the positioning pin structure of the application;

[0036] Figure 7 It is a schematic view of the installation structure of the chassis structure of the application at the rocker beam;

[0037] Figure 8 It is a schematic view of the installation hole and the universal bolt connection structure of the chassis structure of the application;

[0038] The marks in the above drawings are as follows:

[0039] 1, vehicle body system, 2, slide chassis system, 3, rear lower wheel cover, 4, rocker beam, 5, lower front wall, 6, front lower wheel cover, 7, installation column, 8, longitudinal beam, 9, rear upper wheel cover, 10, A column, 11, upper front wall, 12, front engine compartment longitudinal beam, 13, front upper wheel cover, 14, seventh installation hole, 15, eighth installation hole, 16, sixth installation hole, 17, first installation hole, 18, fourth installation hole, 19, fifth installation hole 5, 20, positioning pin, 21, second installation hole, 22, third installation hole, 23, rocker beam, 24, bolt, 25, welded nut, 26, sleeve. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be further described in detail below with reference to the drawings.

[0041] The chassis system comprises a skateboard chassis system 2 and a body system 1; the present application changes the traditional non-load-bearing body structure by the cooperation of the skateboard chassis system 2 and the body system 1, wherein the skateboard chassis system 2 comprises a longitudinal beam group, and the longitudinal beam group comprises two oppositely arranged longitudinal beams 8; the longitudinal beam 8 is a main load-bearing beam, and in the present application, the longitudinal beams 8 are connected by cross beams; the present application cooperates the longitudinal beam 8 and the cross beam, so that the longitudinal beam group disclosed in the present application is a frame structure, which not only simplifies the structure of the traditional longitudinal beam 8, but also well guarantees the overall structural strength of the longitudinal beam 8; in addition, the body system 1 comprises a rocker beam 23, and the rocker beam 23 is connected with an A-pillar 10 and a front engine compartment longitudinal beam 12; the rocker beam 23 is a bottom support mechanism of the body system 1, and the A-pillar 10 and the front engine compartment longitudinal beam 12 are arranged on the rocker beam 23; in the specific implementation, the rocker beam 23 is connected with the front engine compartment longitudinal beam 12 through the A-pillar 10; in addition, in order to facilitate the connection between the skateboard chassis system 2 and the body system 1, the present application requires that the skateboard chassis system 2 and the body system 1 are connected through a connecting structure; through the arrangement of the connecting structure, the connection between the skateboard chassis system 2 and the body system 1 is facilitated, and the arrangement of the connecting structure can realize multiple connection relationships between the skateboard chassis system 2 and the body system 1, thereby well guaranteeing the connection strength between the skateboard chassis system 2 and the body system 1, and further guaranteeing the overall structural strength of the chassis system.

[0042] Further, in the present application, the connecting structure comprises a front connecting structure, the front connecting structure comprises a first connecting structure arranged on the longitudinal beam group, the first connecting structure comprises a mounting column 7 arranged on the longitudinal beam 8, and the mounting column 7 is connected with the A-pillar 10 in the body system 1; in the present application, the first connecting structure mainly comprises the mounting column 7 and a longitudinally arranged plate structure outside the mounting column 7; in the subsequent use, the mounting column 7 is connected with the A-pillar 10; through such an arrangement manner, the first connecting structure serves as a connection point of the skateboard chassis system 2 and the body system 1, and also corresponds to an increase of a rib plate at the lower end of the A-pillar 10, thereby increasing the structural strength of the structure below the A-pillar 10 to a certain extent.

[0043] Further, in the present application, each A-pillar 10 corresponds to a first connecting structure; each longitudinal beam 8 in the longitudinal beam group is provided with a first connecting structure; through such an arrangement manner, the connection and assembly of the lower front panel 5 are facilitated, and the connection between the two A-pillars 10 and the skateboard chassis system 2 can be realized.

[0044] Further, the front connecting structure in the application further comprises a second connecting structure, the second connecting structure comprises a lower front wall 5 arranged on the longitudinal beam group, and the lower front wall 5 is connected with an upper front wall 11 in the vehicle body system 1; the application is equivalent to dividing the traditional front wall into two parts through the lower front wall 5 and the upper front wall 11, and after the subsequent connection of the lower front wall 5 and the upper front wall 11, the connecting points between the skateboard chassis system 2 and the vehicle body system 1 are increased, the connecting strength between the skateboard chassis system 2 and the vehicle body system 1 is better guaranteed, the integrity of the chassis system is guaranteed, and in addition, through the above design, the brake pedal, the accelerator pedal and other operation components can be directly installed on the skateboard chassis during subsequent installation and use, so that the skateboard chassis can be driven independently from the vehicle body.

[0045] Further, the lower front wall 5 in the application is connected with the longitudinal beam group through the first connecting structure on both sides; such a connecting mode facilitates the connection between the lower front wall 5 and the longitudinal beam group, and in addition, through such a connecting mode, the installation points of the longitudinal beam group are reduced, and the problem that the increase of the installation points or installation holes affects the overall structural strength of the longitudinal beam 8 is avoided.

[0046] Further, the front connecting structure in the application further comprises a third connecting structure, the third connecting structure comprises a front lower wheel cover 6 arranged on the longitudinal beam 8, and the front lower wheel cover 6 is connected with a front upper wheel cover 13 in the vehicle body system 1; the application is equivalent to increasing the connecting points in the front part of the chassis system through the connection between the front upper wheel cover 13 and the front lower wheel cover 6, and the connecting strength between the skateboard chassis system 2 and the vehicle body system 1 is better guaranteed.

[0047] Further, the connecting structure in the application further comprises a middle connecting structure, the middle connecting structure comprises a rocker cross beam 4 arranged on the front longitudinal beam 8; the rocker cross beam 4 is connected with a rocker beam 23 in the vehicle body system 1; the application facilitates the connection of the middle part of the skateboard chassis system 2 and the vehicle body system 1 through the arrangement of the middle connecting structure, and in addition, the application also avoids the problem that the installation points in the middle part of the longitudinal beam 8 body affect the strength of the longitudinal beam 8 through the arrangement of the rocker cross beam 4.

[0048] Further, the positioning mechanism is arranged between the threshold cross beam 4 and the threshold beam 23, the positioning mechanism comprises a positioning pin 20 arranged on the threshold cross beam 4, and the threshold beam 23 is provided with a positioning hole; the positioning pin 20 in each positioning mechanism is arranged opposite to the positioning hole on the corresponding threshold beam 23; through the arrangement of the positioning mechanism, the mutual positioning between the skateboard chassis system 2 and the vehicle body system 1 is facilitated, the relative position of the skateboard chassis system 2 and the vehicle body system 1 is limited, and the relative deviation of the skateboard chassis system 2 and the vehicle body system 1 is avoided when the skateboard chassis system 2 and the vehicle body system 1 are connected through the connecting structure.

[0049] Further, the connecting structure further comprises a rear connecting structure; the rear connecting structure comprises a rear lower wheel cover 3 arranged on the longitudinal beam 8 and a rear upper wheel cover 9 arranged on the threshold beam 23 in the vehicle body system 1; the rear lower wheel cover 3 is connected with the rear upper wheel cover 9; through the cooperation of the rear lower wheel cover 3 and the rear upper wheel cover 9, a connecting point is added at the rear of the chassis system, and the connecting strength between the skateboard chassis system 2 and the vehicle body system 1 is increased to a certain extent.

[0050] An assembling method of a chassis system, the assembling method comprises the following steps:

[0051] Step 1: determining the skateboard chassis system 2 and the vehicle body system 1 to be assembled;

[0052] Step 2: initially positioning the skateboard chassis system 2 and the vehicle body system 1 through the positioning mechanism;

[0053] Step 3: after step 2 is completed, connecting the skateboard chassis system 2 and the vehicle body system 1 through the front connecting structure, the middle connecting structure and the rear connecting structure.

[0054] Specifically:

[0055] The application discloses a chassis system, and the connecting point between the skateboard chassis system 2 and the vehicle body system 1 is changed to the wheel cover, the lower front wall 5 and the like, so that the holes on the longitudinal beam 8 do not affect the overall strength of the chassis.

[0056] Further, the reinforcing structure near the traditional connecting point of the longitudinal beam 8 can be reduced.

[0057] Meanwhile, in actual implementation, through the above design, the longitudinal beam 8 can be made of low-strength material, so as to achieve the effects of light weight and cost reduction.

[0058] In the chassis system, the chassis system mainly comprises a skateboard chassis system 2 and a vehicle body system 1, the skateboard chassis system 2 mainly comprises a lower longitudinal beam 8, a lower front wall 5, a front lower wheel cover 6, a mounting column 7, a threshold cross beam 4 and a rear lower wheel cover 3, and the threshold cross beam 4 is further provided with a positioning pin 20.

[0059] As shown in the drawings, Figure 3 The vehicle body system 1 mainly comprises a front upper wheel cover 13, a front engine compartment longitudinal beam 12, an upper front wall 11, an A-pillar 10, a rear upper wheel cover 9 and a rocker beam 23.

[0060] When the skateboard chassis system 2 and the vehicle body system 1 are connected, first, the positioning pins 20 on both sides of the longitudinal beam 8 are inserted into the positioning holes in the corresponding positions of the rocker beam 23, so that the skateboard chassis system 2 and the vehicle body system 1 are pre-positioned, then the mounting structures distributed in the front, middle and rear parts of the skateboard chassis system 2 and the vehicle body system 1 are connected, so that the skateboard chassis system 2 and the vehicle body system 1 are integrally connected.

[0061] Meanwhile, since the front wall in the present application is split into two parts, the lower front wall 5 is part of the skateboard chassis, so that the operating parts such as brake pedal and accelerator pedal originally installed on the vehicle body are installed on the skateboard chassis, so that the skateboard chassis is decoupled from the vehicle body and can be independently driven, thus expanding the application scenarios and range.

[0062] The chassis system disclosed in the present application innovatively splits the existing front wall into two parts, the lower front wall 5 is arranged in the skateboard chassis system 2, and the operating parts such as brake pedal and accelerator pedal originally installed on the front wall are directly installed on the skateboard chassis system 2, so that the skateboard chassis can be independently driven without the vehicle body.

[0063] In addition, in the present application, the overlapping surface of the upper front wall 11 and the lower front wall 5 is also the connecting surface of the vehicle body and the skateboard chassis, which ensures the connection strength between the skateboard chassis system 2 and the vehicle body system 1.

[0064] In addition, in the present application, the front wheel cover and the rear wheel cover of the original vehicle body are also split into two parts, wherein the wheel cover structure connected with the suspension is separated and used as part of the skateboard chassis, which is called front lower wheel cover 6 and rear lower wheel cover 3.

[0065] This design changes the connection point between the vehicle body and the chassis originally arranged on the longitudinal beam 8 to the lower wheel cover, thereby avoiding the problem of affecting the strength of the longitudinal beam 8 due to the hole on the chassis longitudinal beam 8, so that the reinforcing structure near the original mounting point of the longitudinal beam 8 can be omitted or the longitudinal beam 8 can be made of slightly lower strength material, thereby achieving lightweight or cost reduction.

[0066] In addition, in the present application, a mounting column 7 is added inside the lower section of the vehicle body A-pillar 10, and the outer side of the mounting column 7 is connected with the inner side of the vehicle body A-pillar 10, which innovatively increases the mounting point in the vehicle height direction, thereby improving the torsional stiffness of the whole vehicle and the connection strength between the vehicle body and the skateboard chassis.

[0067] In addition, in the present application, the plate chassis system 2 and the vehicle body system 1 are connected by a connecting structure, which includes a front connecting structure, a middle connecting structure and a rear connecting structure, so that the plate chassis system and the vehicle body system 1 disclosed in the present application are connected in three areas; better guarantee the connection strength between the plate chassis system and the vehicle body system 1.

[0068] In the present application, the front connecting structure includes a first connecting structure (also referred to as A-pillar connecting structure), a second connecting structure (also referred to as front apron connecting structure) and a third connecting structure (also referred to as front engine compartment connecting structure).

[0069] The front apron connecting structure: the front apron originally belonging to the vehicle body is divided into upper and lower two parts, wherein the lower front apron 5 is fixed on the longitudinal beam group in the slide plate chassis system 2, and the upper front apron 11 still belongs to the vehicle body system 1; the lower front apron 5 has a transversely stamped feature, the upper surface of which is a mounting surface connected with the upper front apron 11, and a plurality of first mounting holes 17 are formed on the mounting surface, the first mounting holes 17 are used for connecting the upper front apron 11 with the lower front apron 5.

[0070] The A-pillar 10 connecting structure: a mounting column 7 is arranged on each side of the longitudinal beam group close to the lower front apron 5, the mounting column 7 is welded to the lower front apron 5 close to the inside of the vehicle, and a second mounting hole 21 is arranged on the side of the mounting column 7 close to the outside of the vehicle, the second mounting hole 21 is used for connecting the mounting column 7 with the A-pillar 10 of the vehicle body; in addition, a third mounting hole 22 is arranged on the upper part of the side of the mounting column 7 close to the inside of the vehicle, which is used for connecting the mounting column 7 with the upper front apron 11 of the vehicle body.

[0071] The front engine compartment connecting structure: a front lower wheel cover 6 is arranged at the position of the front wheel of the slide plate chassis, the lower side of the front lower wheel cover 6 is connected with the front section of the slide plate chassis longitudinal beam 8, and a fourth mounting hole 18 and a fifth mounting hole 19 are arranged around the front lower wheel cover 6, the fourth mounting hole 18 is used for connecting the front engine compartment longitudinal beam 12 of the vehicle body with the front lower wheel cover 6, and the fifth mounting hole 19 is used for connecting the front upper wheel cover 13 of the vehicle body with the front lower wheel cover 6.

[0072] The middle connecting structure: a rocker cross beam 4 is welded to the outer side of the middle section of the slide plate chassis longitudinal beam 8, the rocker cross beam 4 is provided with a sixth mounting hole 16 and a positioning pin 20, the positioning pin 20 is arranged in a diagonal line and cooperates with the positioning pin hole on the rocker beam 23 of the vehicle body to provide accurate positioning when the vehicle body is connected with the slide plate chassis; the sixth mounting hole is used for connecting the slide plate chassis longitudinal beam 8 with the rocker beam 23 of the vehicle body.

[0073] Rear connection structure: The rear wheel cover 3 is provided at the rear wheel position of the skateboard chassis. The rear wheel cover 3 is connected to the rear section of the longitudinal beam 8 of the skateboard chassis. The rear wheel cover 3 is provided with a longitudinal seventh mounting hole 14 and a transverse eighth mounting hole 15 around its perimeter. The seventh mounting hole 14 and the eighth mounting hole 15 are used for connecting the rear upper wheel cover 9 of the vehicle body to the rear wheel cover 3.

[0074] In summary, the core features of this invention are:

[0075] 1. The traditional front panel is divided into two parts: the lower front panel 5 belongs to the skateboard chassis, and the upper front panel 11 belongs to the body. In this way, the control components such as the brake pedal and accelerator pedal that were originally installed on the front panel are directly installed on the skateboard chassis, so that the skateboard chassis can be driven independently of the body, further expanding its application scenarios and scope.

[0076] 2. In traditional vehicle body structures, the A-pillar 10 is directly connected to the skateboard chassis or the lower body. However, this patent adds mounting pillars 7 on both sides of the skateboard chassis near the inner side of the A-pillar 10. This greatly increases the connection surface between the vehicle body and the chassis, thereby improving the transmission path of impact force at the A-pillar 10 and increasing the overall vehicle strength. On the other hand, since the mounting pillars 7 overlap and superimpose with the lower structure of the A-pillar 10, the overall vehicle's ability to resist torsional deformation is improved.

[0077] 3. This invention divides the wheel cover into two parts: an upper wheel cover and a lower wheel cover. The lower wheel cover belongs to the skateboard chassis and is connected to the chassis longitudinal beam 8. The lower wheel cover has mounting holes around its perimeter as the connection points between the upper and lower wheel covers, which are also the connection points between the vehicle body and the skateboard chassis. This changes the previous situation where the connection points of the vehicle body at the front and rear were mostly arranged on the longitudinal beam 8, avoiding the impact of opening holes in the longitudinal beam 8 on the overall strength of the chassis. At the same time, it eliminates the reinforcing structure near the connection point of the longitudinal beam 8 or allows the longitudinal beam 8 to be made of low-strength materials, thus achieving the effect of weight reduction or cost reduction.

[0078] When making a specific connection:

[0079] The front connection structure mainly includes the first connection structure (also known as the A-pillar connection structure), the second connection structure (also known as the front bulkhead connection structure), and the third connection structure (also known as the front engine compartment connection structure).

[0080] like Figure 8 As shown, the front bulkhead is connected to the front bulkhead 11 on the vehicle body via a lower front bulkhead 5 on the skateboard chassis 2. The lower front bulkhead 5 has several first mounting holes 17, and the corresponding front bulkhead 11 on the vehicle body has through holes and welding nuts 25. Bolts 24 pass through the first mounting holes 17 and are connected to the welding nuts, thus achieving a secure connection. Figure 8As shown. In this invention, the connection structure at the connection holes, except for the sixth mounting hole 16, all adopt... Figure 8 The connection structure shown will not be described again in the following description.

[0081] like Figure 7 The sill beams 4 are welded to the outer side of the middle section of the longitudinal beam 8 of the skateboard chassis shown. The sill beams 4 are provided with a sixth mounting hole 16. A sleeve 26 is welded into the sixth mounting hole 16. The sleeve 26 is used to support the sill beams 4 and prevent the sill beams 4 from being deformed when the bolts 24 are tightened. When the body system is connected to the skateboard chassis system, the bolts 24 pass through the sixth mounting hole 16 and the sleeve 26 and are connected to the welding nuts welded to the body sill beams to fix them.

[0082] It should be noted that the connection methods described in this invention include, but are not limited to, bolt and welded nut connection methods. Similar connection methods such as bolt and rivet nut, nut and rivet bolt, and nut and welded bolt can also be used as connection methods of this invention.

[0083] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A chassis system characterized by, The chassis system comprises a longitudinal beam group, and the longitudinal beam group comprises two oppositely arranged longitudinal beams. The chassis system comprises a longitudinal beam group, and the longitudinal beam group comprises two oppositely arranged longitudinal beams. The body system comprises a rocker beam, and the rocker beam is connected with an A-pillar and a front engine compartment longitudinal beam. The chassis system and the body system are connected through a connecting structure. The connecting structure comprises a front connecting structure, and the front connecting structure comprises a first connecting structure arranged on the longitudinal beam group. The front connecting structure further comprises a second connecting structure, and the second connecting structure comprises a lower front cross beam arranged on the longitudinal beam group.

2. A chassis system according to claim 1, wherein, Each A-pillar corresponds to a first connecting structure, and each longitudinal beam in the longitudinal beam group is provided with a first connecting structure.

3. A chassis system according to claim 1, wherein, The lower front cross beam is connected with the longitudinal beam group through the first connecting structure.

4. A chassis system according to claim 1, wherein, The front connecting structure further comprises a third connecting structure, and the third connecting structure comprises a front lower wheel cover arranged on the longitudinal beam.

5. A chassis system according to claim 1, wherein, The connecting structure further comprises a middle connecting structure, and the middle connecting structure comprises a rocker beam arranged on the front longitudinal beam.

6. A chassis system according to claim 5, wherein, The rocker beam is connected with the rocker beam in the body system.

7. A chassis system according to claim 1, wherein, The connecting structure further comprises a rear connecting structure, and the rear connecting structure comprises a rear lower wheel cover arranged on the longitudinal beam and a rear upper wheel cover arranged on the rocker beam in the body system.

8. A method of assembling a chassis system according to any one of claims 1-7, characterized in that, The assembling method comprises the following steps: Step 1: determining the chassis system and the body system to be assembled; Step 2: initially positioning the chassis system and the body system through the positioning mechanism; Step 3: connecting the chassis system and the body system through the front connecting structure, the middle connecting structure and the rear connecting structure after step 2 is completed.

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