Light A column assembly and side wall inner plate assembly

Abstract

The invention discloses a light A column assembly and a side wall inner plate assembly. The light A column assembly comprises an A column and a connecting assembly. The column A comprises a tubular first section, a tubular second section and a tubular third section which are fixedly connected in sequence, the column A is matched with the column A mounting position in the side wall assembly, and the section of the column A is matched with a cavity defined by parts around the column A mounting position in the side wall assembly; the connecting assembly comprises an A column lower outer plate, a B column connecting piece and a C column inner plate connecting piece, and the B column connecting piece is in a strip shape and is fixedly connected with the second section; the C-column inner plate connecting piece is of a plate-shaped structure and is fixedly connected with the third section, a first extending part extends from the bottom end of the C-column inner plate connecting piece, and the bottom surface of the first extending part is lower than the lowest surface of the third section at the joint of the C-column inner plate connecting piece and the third section. The structure of the A column is simplified, welding procedures are reduced, the weight is reduced, and by designing the B column connecting piece and the C column inner plate connecting piece which are simple in structure, connection between the A column and the B column and connection between the A column and the C column are achieved under the condition that the molded surfaces of the B column and the C column are not changed.

Description

Technical Field

[0001] The present application relates to the technical field of automobile body structural parts, and in particular, to a lightweight A-pillar assembly and a side inner panel assembly. Background Art

[0002] The A-pillar of a car is a connecting column connecting the roof and the front cabin on the left and right front of the car. It is located between the engine compartment and the cockpit and above the left and right rearview mirrors. It is used to connect the roof and the engine compartment to form a cockpit. The traditional A-pillar is made of the A-pillar upper inner plate and the A-pillar upper inner plate extension plate, which are respectively assembled and welded with the A-pillar upper reinforcement plate and then welded with the A-pillar middle plate. The A-pillar upper inner plate and the A-pillar upper inner plate extension plate form a chamber with the A-pillar upper reinforcement plate, which helps to improve the structural strength of the A-pillar. However, multiple parts need to be assembled and welded, which is heavy, complex in structure, cumbersome in welding process, and low in integration. The side inner panel assembly using a traditional A-pillar includes an A-pillar upper inner panel, an A-pillar upper inner panel extension plate, an A-pillar upper reinforcement plate, a lower A-pillar, a B-pillar, a C-pillar, a door sill, an A-pillar middle panel, and a wheel cover assembly. First, the A-pillar upper inner panel and the A-pillar upper inner panel extension plate are respectively assembled and welded with the A-pillar upper reinforcement plate to form an A-pillar upper reinforcement plate. Then, the A-pillar upper reinforcement plate is assembled and welded with the lower A-pillar, the B-pillar, the C-pillar, and the door sill to form a first side panel reinforcement panel assembly. Then, the A-pillar middle panel and the wheel cover assembly are assembled and welded to form a second side panel reinforcement panel assembly. Finally, the first side panel reinforcement panel assembly and the second side panel reinforcement panel assembly are welded together to form a side inner panel assembly. There are many parts, the weight is large, and the welding process is labor-intensive and cumbersome. Summary of the invention

[0003] To solve at least one aspect of the above problems, the present invention provides a lightweight A-pillar assembly, including an A-pillar and a connecting component; the A-pillar includes a first section, a second section and a third section fixedly connected in sequence, and the first section, the second section and the third section are all tubular structures; the shape and extension size of the A-pillar match the shape and extension size of the A-pillar installation location in the side panel assembly, and the cross-section of the A-pillar matches the cavity surrounded by the surrounding parts of the A-pillar installation location in the side panel assembly; when the A-pillar is installed in the side panel assembly, an inner groove is provided on the side away from the side panel outer panel; the connecting component includes an A-pillar lower outer panel, a B-pillar connecting piece and a C-pillar inner panel connecting piece, and the A-pillar lower outer panel is fixedly connected to the free end of the first section; the B-pillar connecting piece is strip-shaped, and the B-pillar connecting piece is fixedly connected to the second section; the C-pillar inner panel connecting piece is a plate-shaped structure, and the C-pillar inner panel connecting piece is fixedly connected to the third section; a first extension portion extends from the bottom end of the C-pillar inner panel connecting piece, and the bottom surface of the first extension portion is lower than the lowest surface of the third section at the connection between the C-pillar inner panel connecting piece and the third section.

[0004] Through the above technical solution, a tubular A-pillar matching the A-pillar installation position in the side panel assembly is adopted to replace the A-pillar welded by the A-pillar upper inner plate, the A-pillar upper inner plate extension plate, the A-pillar upper reinforcement plate and the A-pillar middle plate in the prior art, thereby simplifying the structure of the A-pillar, helping to reduce the welding process and reduce the weight; since the size of the outer contour of the A-pillar becomes smaller, the use of the tubular A-pillar will cause the A-pillar and the B-pillar and the A-pillar and the C-pillar to be disconnected at their connection points, and by designing a B-pillar connector and a C-pillar inner plate connector with simple structures, which are respectively arranged at the connection between the A-pillar and the B-pillar and the connection between the A-pillar and the C-pillar, the connection between the A-pillar and the B-pillar and the A-pillar and the C-pillar is achieved without changing the profiles of the B-pillar and the C-pillar.

[0005] Preferably, the material thickness of the first section is less than that of the second section, and greater than that of the third section. Through the above technical solution, the tubular A-pillar is designed to have a structure with unequal material thickness, that is, the material thickness is large in the area where the A-pillar has a large bearing force, and the material thickness is small in the area where the A-pillar has a small bearing force, which helps to reduce the weight of the A-pillar while ensuring the bearing force of the A-pillar.

[0006] Preferably, the connecting assembly includes a middle top cover cross beam connecting plate, which is arranged opposite to the B-pillar connecting piece; the middle top cover cross beam connecting plate includes a middle top cover cross beam connecting plate body and a second extension portion; the middle top cover cross beam connecting plate body is fixedly connected to the second section; the second extension portion is fixedly connected to the bottom end of the middle top cover cross beam connecting plate body, the second extension portion matches the top end of the B-pillar, and the bottom surface of the second extension portion is lower than the lowest surface of the second section at the connection between the middle top cover cross beam connecting plate body and the second section.

[0007] Preferably, the connecting assembly also includes a C-pillar reinforcement plate; the C-pillar reinforcement plate is a curved structure along the circumferential direction of the third section, the C-pillar reinforcement plate and the C-pillar inner plate connecting piece are arranged opposite to each other, and the C-pillar reinforcement plate and the A-pillar lower outer plate are located on the same side, and the C-pillar reinforcement plate is fixedly connected to the free end of the third section.

[0008] Preferably, the A-pillar lower outer panel comprises an A-pillar lower outer panel body and a connecting portion; the connecting portion is fixedly sleeved on the free end of the first section, and the bottom surface of the connecting portion is fixedly connected to the top end of the A-pillar lower outer panel body.

[0009] Preferably, the connecting assembly also includes a handle bracket, the handle bracket includes a handle bracket body and a third extension portion; the handle bracket body is fixedly connected to the A-pillar, the third extension portion is fixedly connected to the bottom end of the handle bracket body, and the bottom surface of the third extension portion is lower than the lowest surface of the A-pillar at the connection between the handle bracket body and the A-pillar.

[0010] Preferably, two handle brackets are provided, and the handle bracket bodies of the two handle brackets are respectively fixed to the side surface of the second section and the third section.

[0011] Preferably, the connecting assembly also includes a front top cover cross beam connecting plate, which includes a front top cover cross beam connecting plate body and a fourth extension portion; the front top cover cross beam connecting plate body is fixedly connected to the first connecting end of the second section; the fourth extension portion is fixedly connected to the bottom end of the front top cover cross beam connecting plate body, and the bottom surface of the fourth extension portion is lower than the lowest surface of the second section at the connection between the front top cover cross beam connecting plate body and the second section.

[0012] Preferably, the first section, the second section and the third section are integrally formed.

[0013] The present application also provides a side inner panel assembly, including a lower A-pillar, a door sill, a B-pillar, a C-pillar and a wheel cover assembly, and also includes any of the above-mentioned light A-pillar assemblies, the side of the A-pillar lower outer panel is welded to the side of the lower A-pillar, the top of the B-pillar is welded to the second section and the outer side of the B-pillar connecting piece, the top of the C-pillar is welded to the C-pillar inner panel connecting piece, the first end of the door sill is welded to the bottom end of the lower A-pillar, the middle of the door sill is welded to the bottom end of the B-pillar, the bottom end of the wheel cover is welded to the second end of the door sill, and the top side of the wheel cover is welded to the side of the C-pillar. Through the above technical solution, a side inner panel assembly including the above-mentioned A-pillar assembly is disclosed. Compared with the prior art, the components are reduced, which helps to reduce the workload of the welding process and reduce the weight of the side inner panel assembly.

[0014] A light A-pillar assembly and a side panel inner panel assembly of the present invention have the following beneficial effects:

[0015] By designing the A-pillar as an integrally formed tubular structure that matches the A-pillar installation position in the side panel assembly, the structure of the A-pillar is simplified, which helps to reduce the welding process and reduce the weight; by designing a B-pillar connector and a C-pillar inner panel connector with simple structures, and respectively improving the structures of the A-pillar lower outer panel, the middle roof crossbeam connecting plate, the C-pillar reinforcement plate, the handle bracket, and the front roof crossbeam connecting plate, it is possible to connect these components to the A-pillar assembly without changing the structure of the components connected to the A-pillar assembly, thereby solving the problem that the A-pillar cannot be connected to these components due to the reduction in the size of the A-pillar outer contour; the side panel inner panel assembly of the present application adopts the above-mentioned A-pillar assembly, reduces the component parts, helps to reduce the workload of the welding process and reduce the weight of the side panel inner panel assembly BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0017] Figure 1A schematic structural diagram of a lightweight A-pillar assembly according to an embodiment of the present invention is shown;

[0018] Figure 2 An exploded view of a lightweight A-pillar assembly according to an embodiment of the present invention is shown;

[0019] Figure 3 It shows a cross-sectional view of a light-weight A-pillar assembly and a side panel after installation at A according to an embodiment of the present invention;

[0020] Figure 4 It shows a cross-sectional view at B after a light-weight A-pillar assembly and a side panel are installed according to an embodiment of the present invention;

[0021] Figure 5 A cross-sectional view at point C after a lightweight A-pillar assembly and a side panel are installed according to an embodiment of the present invention is shown.

[0022] Description of reference numerals:

[0023] 1. A-pillar; 11. First section; 12. Second section; 13. Third section; 2. Depressed portion; 3. A-pillar lower outer panel; 31. A-pillar lower outer panel body; 32. Connecting portion; 4. B-pillar connecting piece; 5. C-pillar inner panel connecting piece; 51. First step portion; 52. First extension portion; 6. Middle roof crossbeam connecting plate; 61. Middle roof crossbeam connecting plate body; 62. Second step portion; 63. Second extension portion; 7. C-pillar reinforcement plate; 8. Handle bracket; 81. Handle bracket body; 82. Third step portion; 83. Third extension portion; 9. Front roof crossbeam connecting plate; 91. Front roof crossbeam connecting plate body; 92. Fourth step portion; 93. Fourth extension portion. DETAILED DESCRIPTION

[0024] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0025] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0026] In order to at least partially solve the above problems and one or more of other potential problems, an embodiment of the present disclosure provides a lightweight A-pillar assembly, including an A-pillar 1 and a connecting assembly; the A-pillar 1 includes a first section 11, a second section 12 and a third section 13 fixed in sequence, and the first section 11, the second section 12 and the third section 13 are all tubular structures; the shape and extension size of the A-pillar 1 match the shape and extension size of the installation location of the A-pillar 1 in the side enclosure assembly, and the cross-section of the A-pillar 1 matches the cavity surrounded by the components around the installation location of the A-pillar 1 in the side enclosure assembly; the A-pillar 1 is installed in the side enclosure assembly. An inner groove is provided on the side away from the side outer panel when the side panel is assembled; the connecting component includes an A-pillar lower outer panel 3, a B-pillar connecting member 4 and a C-pillar inner panel connecting member 5, the A-pillar lower outer panel 3 is fixedly connected to the free end of the first section 11; the B-pillar connecting member 4 is strip-shaped, and the B-pillar connecting member 4 is fixedly connected to the second section 12; the C-pillar inner panel connecting member 5 is a plate-shaped structure, and the C-pillar inner panel connecting member 5 is fixedly connected to the third section 13; a first extension portion 52 is extended from the bottom end of the C-pillar inner panel connecting member 5, and the bottom surface of the first extension portion 52 is lower than the lowest surface of the third section 13 at the connection between the C-pillar inner panel connecting member 5 and the third section 13.

[0027] Specifically, Figures 1 to 5 As shown, the A-pillar 1 is integrally formed, and the shape and extension size of the A-pillar 1 match the shape and extension size of the A-pillar 1 installation location in the side panel assembly; the A-pillar 1 includes a first section 11, a second section 12 and a third section 13 that are fixed in sequence, and the first section 11, the second section 12 and the third section 13 are all tubular structures, such as Figures 3 to 5 As shown, the cross-sections of the first section 11, the second section 12 and the third section 13 are all trapezoidal, and each cross-section of the A-pillar 1 matches the cavity surrounded by the components surrounding the installation location of the A-pillar 1 in the side panel assembly; when the A-pillar 1 is installed in the side panel assembly, an inner groove extending along the extension direction of the A-pillar 1 is provided on the side away from the side panel outer panel, which plays a supporting role for the side panel outer panel; preferably, the material thickness of the first section 11 is less than the material thickness of the second section 12, and greater than the material thickness of the third section 13.

[0028] like Figure 1 and Figure 2 As shown, the connection assembly includes an A-pillar lower outer panel 3, a B-pillar connector 4, a C-pillar inner panel connector 5, a middle roof crossbeam connecting plate 6, a C-pillar reinforcement plate 7, a handle bracket 8, and a front roof crossbeam connecting plate 9.

[0029] The A-pillar lower outer panel 3 includes an A-pillar lower outer panel body 31 and a connecting portion 32, the connecting portion 32 is fixedly sleeved on the free end of the first section 11, and the bottom surface of the connecting portion 32 is fixedly connected to the top end of the A-pillar lower outer panel body 31; the B-pillar connecting member 4 is strip-shaped, and the extension direction of the B-pillar connecting member 4 is the same as the extension direction of the second section 12, and the B-pillar connecting member 4 is fully or half-covered on the outer surface of the second section 12. In this embodiment, the B-pillar connecting member 4 is half-covered on the outer surface of the second section 12, the B-pillar connecting member 4 is fixedly connected to the second section 12, and the outer side surface of the B-pillar connecting member 4 is used to connect to the top end of the B-pillar; the C-pillar inner panel connecting member 5 is a plate-shaped structure, and the C-pillar The inner panel connector 5 is fixedly connected to the third section 13; a first extension portion 52 is extended downward from the bottom end of the C-pillar inner panel connector 5, and the bottom surface of the first extension portion 52 is lower than the lowest surface of the third section 13 at the connection between the C-pillar inner panel connector 5 and the third section 13; a first step portion 51 is provided between the C-pillar inner panel connector 5 and the first extension portion 52, and the step surface of the first step portion 51 is fixedly connected to the third section 13 and matches the bottom surface of the third section 13 at the connection, the first side surface of the first step portion 51 is fixedly connected to the bottom end of the C-pillar inner panel connector 5, and the second side surface of the first step portion 51 opposite to the first side surface is fixedly connected to the top end of the first extension portion 52.

[0030] The middle roof cross beam connecting plate 6 is arranged opposite to the B-pillar connecting piece 4, and the middle roof cross beam connecting plate 6 is on the same side as the C-pillar inner plate connecting piece 5; the middle roof cross beam connecting plate 6 includes a middle roof cross beam connecting plate body 61, a second step portion 62 and a second extension portion 63; the middle roof cross beam connecting plate body 61 is fixedly connected to the second section 12; the step surface of the second step portion 62 is fixedly connected to the second section 12, and matches with the bottom surface of the second section 12 at the connection therewith, the first side surface of the second step portion 62 is fixedly connected to the bottom end of the middle roof cross beam connecting plate body 61, and the second side surface of the second step portion 62 opposite to the first side surface is fixedly connected to the top end of the second extension portion 63; the second extension portion 63 matches with the top end of the B-pillar, and the bottom surface of the second extension portion 63 is lower than the lowest surface of the second section 12 at the connection between the middle roof cross beam connecting plate body 61 and the second section 12.

[0031] The C-pillar reinforcement plate 7 is a curved structure along the circumferential direction of the third section 13 . The C-pillar reinforcement plate 7 is arranged opposite to the C-pillar inner panel connector 5 , and the C-pillar reinforcement plate 7 is located on the same side as the A-pillar lower outer panel 3 . The C-pillar reinforcement plate 7 is fixedly connected to the free end of the third section 13 .

[0032] Two handle brackets 8 are provided, and the two handle brackets 8 are both located on the same side as the middle roof beam connecting plate 6, and the handle bracket 8 includes a handle bracket body 81, a third step portion 82 and a third extension portion 83; the handle bracket bodies 81 of the two handle brackets 8 are respectively fixed to the surface of the second section 12 and the surface of the third section 13; the step surfaces of the third step portions 82 of the two handle brackets 8 are respectively fixed to the second section 12 and the third section 13, and respectively match the bottom surfaces of the second section 12 and the third section 13 at the connection therebetween; the first side surface of the third step portion 82 is fixed to the bottom end of the handle bracket 8, and the second side surface of the third step portion 82 opposite to the first side surface is fixed to the top end of the third extension portion 83, and the bottom surfaces of the third extension portions 83 of the two handle brackets are respectively lower than the lowest surface of the second section 12 at the connection between the handle bracket body 81 and the second section 12 and the lowest surface of the third section 13 at the connection between the handle bracket body 81 and the third section 13.

[0033] The front top cover cross beam connecting plate 9 and the middle top cover cross beam connecting plate 6 are located on the same side, and the front top cover cross beam connecting plate 9 includes a front top cover cross beam connecting plate body 91, a fourth step portion 92 and a fourth extension portion 93; the front top cover cross beam connecting plate body 91 is fixedly connected to the first connecting end of the second section 12; the step surface of the fourth step portion 92 is fixedly connected to the first connecting end of the second section 12, and matches the bottom surface of the first connecting end of the second section 12 at the connection therewith; the first side surface of the fourth step portion 92 is fixedly connected to the bottom end of the front top cover cross beam connecting plate body 91, and the second side surface of the fourth step portion 92 opposite to the first side surface is fixedly connected to the top end of the fourth extension portion 93, and the bottom surface of the fourth extension portion 93 is lower than the lowest surface of the second section 12 at the connection between the front top cover cross beam connecting plate body 91 and the second section 12.

[0034] The present application also provides a side inner panel assembly, including a lower A-pillar, a door sill, a B-pillar, a C-pillar and a wheel cover assembly, and also includes any of the above-mentioned light A-pillar assemblies, the side of the A-pillar lower outer panel 3 is welded to the side of the lower A-pillar, the top of the B-pillar is welded to the outer side of the second section 12 and the B-pillar connector 4, the top of the C-pillar is welded to the C-pillar inner panel connector 5, the first end of the door sill is welded to the bottom end of the lower A-pillar, the middle part of the door sill is welded to the bottom end of the B-pillar, the bottom end of the wheel cover is welded to the second end of the door sill, and the top side of the wheel cover is welded to the side of the C-pillar.

[0035] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A lightweight A-pillar assembly, characterized in that: It includes an A-pillar (1) and a connecting assembly; The A-pillar (1) comprises a first section (11), a second section (12) and a third section (13) which are fixedly connected in sequence, and the first section (11), the second section (12) and the third section (13) are all tubular structures; the shape and extension size of the A-pillar (1) match the shape and extension size of the installation position of the A-pillar (1) in the side panel assembly, and the cross section of the A-pillar (1) matches the cavity surrounded by the parts around the installation position of the A-pillar (1) in the side panel assembly; when the A-pillar (1) is installed in the side panel assembly, an inner groove is provided on the side away from the side panel outer plate; The connection assembly comprises an A-pillar lower outer panel (3), a B-pillar connecting member (4) and a C-pillar inner panel connecting member (5); the A-pillar lower outer panel (3) is fixedly connected to the free end of the first section (11); the B-pillar connecting member (4) is strip-shaped and fixedly connected to the second section (12); the C-pillar inner panel connecting member (5) is a plate-shaped structure and fixedly connected to the third section (13); a first extension portion (52) is extended from the bottom end of the C-pillar inner panel connecting member (5), and the bottom surface of the first extension portion (52) is lower than the lowest surface of the third section (13) at the connection between the C-pillar inner panel connecting member (5) and the third section (13).

2. A lightweight A-pillar assembly according to claim 1, characterized in that: The material thickness of the first section (11) is smaller than the material thickness of the second section (12), and larger than the material thickness of the third section (13).

3. The lightweight A-pillar assembly according to claim 1, characterized in that: The connection assembly comprises a middle top cover cross beam connection plate (6), and the middle top cover cross beam connection plate (6) is arranged opposite to the B-pillar connection piece (4); the middle top cover cross beam connection plate (6) comprises a middle top cover cross beam connection plate body (61) and a second extension portion (63); the middle top cover cross beam connection plate body (61) is fixedly connected to the second section (12); the second extension portion (63) is fixedly connected to the bottom end of the middle top cover cross beam connection plate body (61), the second extension portion (63) matches the top end of the B-pillar, and the bottom surface of the second extension portion (63) is lower than the lowest surface of the second section (12) at the connection between the middle top cover cross beam connection plate body (61) and the second section (12).

4. The lightweight A-pillar assembly according to claim 1, characterized in that: The connection assembly also includes a C-pillar reinforcement plate (7); the C-pillar reinforcement plate (7) is a curved structure along the circumferential direction of the third section (13); the C-pillar reinforcement plate (7) and the C-pillar inner plate connecting member (5) are arranged opposite to each other, and the C-pillar reinforcement plate (7) and the A-pillar lower outer plate (3) are located on the same side; the C-pillar reinforcement plate (7) is fixedly connected to the free end of the third section (13).

5. The lightweight A-pillar assembly according to claim 1, characterized in that: The A-pillar lower outer panel (3) comprises an A-pillar lower outer panel body (31) and a connecting portion (32); the connecting portion (32) is fixedly sleeved on the free end of the first section (11), and the bottom surface of the connecting portion (32) is fixedly connected to the top end of the A-pillar lower outer panel body (31).

6. The lightweight A-pillar assembly according to claim 1, characterized in that: The connection assembly also includes a handle bracket (8), the handle bracket (8) including a handle bracket body (81) and a third extension portion (83); the handle bracket body (81) is fixedly connected to the A-pillar (1), the third extension portion (83) is fixedly connected to the bottom end of the handle bracket body (81), and the bottom surface of the third extension portion (83) is lower than the lowest surface of the A-pillar (1) at the connection between the handle bracket body (81) and the A-pillar (1).

7. The lightweight A-pillar assembly according to claim 6, characterized in that: Two handle brackets (8) are provided, and the handle bracket bodies (81) of the two handle brackets (8) are respectively fixedly connected to the second section (12) and the third section (13).

8. The lightweight A-pillar assembly according to claim 1, characterized in that: The connection assembly further comprises a front roof cross beam connection plate (9), the front roof cross beam connection plate (9) comprising a front roof cross beam connection plate body (91) and a fourth extension portion (93); the front roof cross beam connection plate body (91) is fixedly connected to the first connection end of the second section (12); the fourth extension portion (93) is fixedly connected to the bottom end of the front roof cross beam connection plate body (91), and the bottom surface of the fourth extension portion (93) is lower than the lowest surface of the second section (12) at the connection between the front roof cross beam connection plate body (91) and the second section (12).

9. The lightweight A-pillar assembly according to claim 1, characterized in that: The A-pillar (1) is integrally formed.

10. A side inner panel assembly, comprising a lower A-pillar, a door sill, a B-pillar, a C-pillar and a wheel house assembly, characterized in that: It also includes a light A-pillar assembly as described in any one of claims 1 to 9, wherein the side of the lower outer panel (3) of the A-pillar is welded to the side of the lower A-pillar, the top of the B-pillar is welded to the outer side of the second section (12) and the B-pillar connecting member (4), the top of the C-pillar is welded to the C-pillar inner panel connecting member (5), the first end of the door sill is welded to the bottom end of the lower A-pillar, the middle of the door sill is welded to the bottom end of the B-pillar, the bottom end of the wheel cover is welded to the second end of the door sill, and the top side of the wheel cover is welded to the side of the C-pillar.

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