Seat side airbag

Abstract

The present application relates to a seat side airbag comprising an airbag (100) which is single-chambered and which, in an inflated state of the airbag, comprises a first side portion (101) on the occupant side, a second side portion (102) on the vehicle body side opposite the first side portion, and an intermediate portion (103) connecting the first side portion and the second side portion, the airbag being configured such that, during inflation of the airbag, the first side portion and the second side portion support the intermediate portion, the intermediate portion lifting the occupant's arm. The airbag comprises a first main panel (10) and a second main panel (20) and an intermediate panel (30) which, in a flattened state, extends elongatedly and which has a width which increases towards the middle from both ends thereof, at least a major portion of said intermediate portion in the inflated state being part of a spherical surface. The seat side airbag reliably lifts the occupant's arm when seated on a vehicle seat provided with the seat side airbag, providing improved protection for the occupant.

Description

Technical Field

[0001] This application relates to vehicle safety technology, and in particular to a seat side airbag for a vehicle seat. Background Technology

[0002] Airbags are widely used as a component of passive safety systems in known vehicles, especially passenger cars. Side airbags, as a type of airbag, are primarily installed on the sheet metal parts of the side frame of the seat back, for example, by bolted connections. Side airbags are also called seat side airbags or vehicle side airbags. In emergency situations, especially in side collisions, seat side airbags can be activated, deploying from the vehicle seat to provide cushioning and protection for the occupants, mitigating or even completely preventing injury from a vehicle accident.

[0003] In practice, a type of seat side airbag is known that, when activated, has a flat airbag structure; in other words, the airbag has a finite thickness in its inflated state and a significant area in a plane perpendicular to the thickness direction. This type of seat side airbag can be called a 2D airbag.

[0004] In addition, a type of seat side airbag, which can be called a 3D airbag, is known in practice. This type of seat side airbag has multiple chambers in its air bag. The shape and structure of this type of seat side airbag are complex, and the manufacturing cost is high. Summary of the Invention

[0005] The inventors of this application discovered during product research and development that, in the event of a side collision, the small contact area between the colliding object and the vehicle body, coupled with the high pressure exerted by the object on the body, leads to a rapid and extensive intrusion of the object into the vehicle. The gap between the occupant and the vehicle body can be quickly filled by deformed body parts and interior components, which then begin to compress the occupant's torso. If the occupant's arms are not raised in advance, the deformed body parts may compress the ribs along with the arms, potentially causing injury and compromising occupant safety. Therefore, especially after a side collision, key considerations include: the side airbag effectively raising the occupant's arms; and maintaining a safe clearance between the vehicle body and the occupant, i.e., ensuring the side airbag is not breached.

[0006] The purpose of this application is to provide a seat side airbag that can reliably lift the occupant's arms when activated, providing improved safety protection.

[0007] This application relates to a seat side airbag, which includes an airbag that is single-chambered and spherical in its inflated state. The airbag includes a first side portion on the occupant side, a second side portion on the vehicle body side opposite the first side portion, and a central portion connecting the first and second side portions. The airbag is configured such that, during inflation, the first and second side portions support the central portion, and the central portion lifts the occupant's arm. The airbag includes a first main piece, a second main piece, and a central piece. The first main piece is configured to form the first side portion in the inflated state of the airbag. The second main sheet is configured to form a second side portion in the inflated state of the airbag, and the intermediate sheet is configured to form an intermediate portion in the inflated state of the airbag. The intermediate sheet is a sheet separate from the first and second main sheets. The intermediate sheet extends elongatedly in a flattened state and has a width that gradually increases from its two ends toward its center. The intermediate sheet forms a first seam with the first main sheet at a first longitudinal edge and forms a second seam with the second main sheet at a second longitudinal edge opposite to the first seam. In the inflated state of the airbag, at least a majority of the intermediate portion is part of a sphere.

[0008] Compared to known 2D airbags as seat side airbags, the seat side airbag according to the present invention can have an increased width when activated, providing a larger contact area for the occupant's arm and providing reliable support to this contact area during the inflation of the airbag, so that the contact area fully expands, reliably lifts the occupant's arm, and thus achieves better protection for the occupant.

[0009] In some embodiments, the intermediate sheet may be a sheet separate from the first and second main sheets.

[0010] In some implementations, the first main sheet and the second main sheet can be configured as two parts of a single sheet.

[0011] In some implementations, the first main sheet and the second main sheet may be two separate, interconnected sheets.

[0012] In some embodiments, the intermediate sheet can be formed from a single sheet with the first main sheet and / or the second main sheet through appropriate cutting.

[0013] In some embodiments, the airbag can be constructed from one or more sheets by appropriate cutting, each sheet providing part or all of any one or more of the first side portion, second side portion, and middle portion of the airbag.

[0014] In some implementations, the first and second master sheets may have substantially straight boundaries.

[0015] In some embodiments, the first main sheet and the second main sheet may each have an elliptical or circular outline in a flattened state, and the outlines of the first main sheet and the second main sheet form two opposing recesses between each other.

[0016] In some embodiments, when the first and second main panels are stacked in a flattened state, the outline of the first main panel is within the outline of the second main panel. This results in the second seam between the second main panel and the intermediate panel being higher than the first seam between the first main panel and the intermediate panel in the lateral direction of the airbag when it is inflated. Therefore, when the side airbag is activated, the middle portion of the airbag in the inflated state generally descends from the second seam towards the first seam, making it easier for the occupant's arms to move towards the occupant's torso than towards the vehicle body, which can improve side-impact safety.

[0017] In this invention, the structure of the middle piece, which is wider in the middle and narrower at both ends, facilitates a more three-dimensional airbag structure. This not only overcomes the shortcomings of traditional 2D airbags—namely, the limited thickness of the airbag in the Y-direction and its significant impact from airbag folding during deployment—but also optimizes the known multi-chamber structure of 3D airbags. Therefore, the seat side airbags in these embodiments combine the advantages of lightweight design, low cost, and excellent protective effect. The seat side airbags in these embodiments can be figuratively referred to as 2.5D airbags. Typically, the Y-direction corresponds to the lateral direction in the vehicle coordinate system, where the vehicle seat is in a conventional orientation.

[0018] In some implementations, the first and second main panels can provide sufficient support for the intermediate panel, allowing it to unfold well during the inflation of the airbag. Furthermore, the width of the airbag in the Y direction can be significantly increased when the airbag is inflated, which greatly increases the contact area of ​​the airbag for contact with the occupant's arm, allowing the occupant's arm to be lifted smoothly and reliably.

[0019] In some embodiments, when the air bag is flattened, the first main piece and the second main piece can be overlapped. In this overlapped state, the boundary between the first main piece and the second main piece forms a substantially straight first portion of the edge of the air bag, and the second seam forms a substantially arcuate second portion that is adjacent to both ends of the first portion of the edge of the air bag. The first seam forms an arcuate line that is adjacent to both ends of the first portion of the edge of the air bag and extends inside the edge of the air bag.

[0020] In some embodiments, the air bag may have a first fold line and a second fold line. When the air bag is flattened, the first fold line, the second fold line, and the straight portion of the edge of the air bag may form a right triangle, wherein the first fold line is substantially perpendicular to the straight portion of the edge of the air bag.

[0021] In some embodiments, when the air bag is flattened, the first fold line and the second fold line may intersect on the arcuate portion of the edge of the air bag, and the second fold line and the straight portion of the edge of the air bag may intersect at the upper end of the straight portion of the edge of the air bag.

[0022] In these embodiments, through the special design of the fold lines, the unfolding direction of the upper part of the airbag can be well adapted to the angle of the occupant's (dummy's) arm during the inflation process, so that the airbag can make good contact with the arm and smoothly raise the arm.

[0023] In some embodiments, the seat side airbag may include an air guide bag disposed inside the airbag, the air guide bag having a lower opening, the air guide bag being configured such that, during the inflation of the airbag, gas introduced into the air guide bag is guided from top to bottom, and thus airflow exiting from the lower opening of the air guide bag fills the airbag from bottom to top.

[0024] In these embodiments, the air bag structure, which is sealed at the top and ventilated at the bottom, combined with the aforementioned fold line design, allows the air bag to inflate and expand from bottom to top during the inflation process. The expansion direction of the upper part of the air bag can be well adapted to the angle of the occupant's (dummy's) arm, so that the air bag can make good contact with the arm and smoothly raise the arm.

[0025] In some implementations, when the air bag is inflated, at least a majority, such as at least 3 / 4, of the middle portion may be part of a sphere.

[0026] In some embodiments, when the air bag is inflated, at least a majority (e.g., at least 3 / 4) of the middle portion, the regions of the first side portions adjacent to the at least majority of the middle portion, and the regions of the second side portions adjacent to the at least majority of the middle portion may be part of a sphere.

[0027] In some implementations, when the airbag is inflated, the area of ​​the first side portion may occupy a large portion (e.g., more than 2 / 3) of the area of ​​the first side portion, and the area of ​​the second side portion may occupy a large portion (e.g., more than 2 / 3) of the area of ​​the second side portion.

[0028] In an advantageous implementation, the basic structure of the seat side airbag has been adjusted compared to known seat side airbags. In conjunction with the design of the air duct and the folding form of the air duct, the protective effect of the seat side airbag and the stability of occupant protection can be significantly improved.

[0029] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0030] Exemplary embodiments will now be described with reference to the illustrative accompanying drawings. Wherein:

[0031] Figure 1 This is a plan view of a sheet of a seat side airbag according to one embodiment of the present invention.

[0032] Figure 2 This is a plan view of another sheet of the seat side airbag.

[0033] Figure 3 This is a plan view of the airbag in the seat side airbag in its flattened state.

[0034] Figure 4 This is a frontal perspective view of the side airbag of the seat in its inflated state.

[0035] Figure 5 This is a perspective view of the seat side airbag in its inflated state, viewed from the occupant side.

[0036] Figure 6 This is a perspective view of the seat side airbags in their inflated state, viewed from the side of the vehicle.

[0037] Figure 7 This is a schematic diagram illustrating the application of side airbags in a vehicle. Detailed Implementation

[0038] The specific embodiments of the present invention will now be further described with reference to the accompanying drawings.

[0039] In the following description, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals may refer to the same or similar parts. The invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. It should be understood that the description of the exemplary embodiments should not limit the invention to these exemplary embodiments. Rather, the invention is intended to cover not only the exemplary embodiments, but also various variations, modifications, equivalents, and other embodiments, which are included within the scope of protection of the invention as defined by the appended claims.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms are intended to include the plural forms as well, unless expressly excluded by the context. It should also be understood that, when used in the specification, the term "comprising" specifies the presence of said features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0041] In the sense of this application, the term "vehicle" can be generally understood as a means of transport, such as a land vehicle, a water vehicle (or a ship) or an air vehicle (or an aircraft), especially a motor vehicle such as a passenger car or a truck.

[0042] For example, the term "vehicle seat" can generally be understood as a seat used in a means of transportation, such as a seat in a motor vehicle, a seat in a ship, a seat in an airplane, and so on.

[0043] Figure 1 This is a plan view of a sheet 1 of a seat side airbag according to one embodiment of the present invention, and Figure 2 This is a plan view of another sheet 2 of the seat side airbag. These two sheets 1 and 2 together constitute the airbag 100 of the seat side airbag. In the illustrated embodiment, the airbag 100 can be spherical in the inflated state, and therefore the two sheets 1 and 2 may not be strictly planar in the flattened state. Similarly, as will be mentioned below... Figure 3 The air bag 100 shown in its flattened state is not strictly planar.

[0044] like Figure 1 The sheet 1 shown in its flattened state may include a first main sheet 10 and a second main sheet 20, which are separated by a straight boundary 3 indicated by dashed lines. The first main sheet 10 and the second main sheet 20 are configured as follows: Figure 1The diagram shows two parts of a single sheet 1. In embodiments not shown, the first main sheet 10 and the second main sheet 20 may also be two separate sheets connected, for example, by stitching, at straight boundaries. The first main sheet 10 has a generally elliptical outline in its flattened state; more precisely, the outline of the first main sheet 10 is roughly a complete elliptical outline, and the two ends of the outline of the first main sheet 10 are connected by the dashed lines of boundary 3. The second main sheet 20 has a generally circular outline in its flattened state; more precisely, the outline of the second main sheet 20 is roughly a complete circular outline, and the two ends of the outline of the second main sheet 20 are connected by the dashed lines of boundary 3. The outlines of the first main sheet 10 and the second main sheet 20 form two opposing recesses 11, 12 between each other.

[0045] like Figure 2 As shown, the intermediate sheet 30 is composed of a single sheet 2. The intermediate sheet 30, or sheet 2, extends elongatedly in a flattened state. The intermediate sheet 30 has a width that gradually increases from its two ends toward its center. The intermediate sheet 30 forms a first seam 6 with the first main sheet 10 (more specifically, the arcuate edge of the first main sheet) at a first longitudinal edge 31 (see...). Figures 3 to 5 The intermediate piece 30 forms a second seam 7 opposite to the first seam 6 with the second main piece 20 (more specifically, the arcuate edge of the second main piece) at its second longitudinal edge 32, which is opposite to the first longitudinal edge 31. Figure 3 , Figure 4 and Figure 6 Typically, the seams 6 and 7 can be sewn together. The intermediate piece 30 may also have a vent 4. During the inflation of the airbag, if the gas pressure inside the airbag exceeds a predetermined threshold, the gas can be released from the airbag 100 through the vent 4 to prevent excessive internal pressure from causing injury to the occupant. The vent 4 is mainly used to regulate the pressure inside the airbag 100, ensuring that the airbag 100 achieves optimized protection during a collision. By appropriately designing the position of the vent 4 on the intermediate piece 30, the vent 4 will not be blocked during inflation and thus lose its pressure-limiting function.

[0046] Figure 3 This is a plan view of the airbag 100 of the seat side airbag in its flattened state. In the flattened state, the first main piece 10 and the second main piece 20 overlap. The boundary 3 between the first main piece 10 and the second main piece 20 forms a straight first portion of the edge of the airbag in the flattened state. A second seam 7 forms an arc-shaped second portion of the edge of the airbag in the flattened state, which is adjacent to both ends of the first portion. A first seam 6 forms an arc extending inward from the edge of the airbag in the flattened state, and is adjacent to both ends of the straight first portion of the airbag's edge. For simplicity, in... Figure 3The air bag 100 is not described in the description of the exhaust port 4 in the intermediate piece 30.

[0047] exist Figure 3 A schematically depicted air guide bag 40 is disposed inside the air bag 100. The air guide bag 40 is closed at the top and has an opening at the bottom. The air guide bag 40 is configured such that, during the expansion of the air bag, gas input from a gas generator (not shown) into the air guide bag 40 is guided downwards, and the airflow exiting from the lower opening of the air guide bag 40 fills the air bag 100 upwards.

[0048] exist Figure 3 Two fold lines of the airbag 100 are also visible, namely the first fold line 8 and the second fold line 9. In the flattened state of the airbag 100, the first fold line 8, the second fold line 9, and the straight portion of the edge of the airbag 100 (or the boundary 3 of the first and second main pieces) can approximately form a right-angled triangle, wherein the first fold line 8 is perpendicular to the straight portion of the edge of the airbag 100. In the flattened state of the airbag, the first fold line 8 and the second fold line 9 can intersect at the arc-shaped portion of the edge of the airbag, and the second fold line 9 and the straight portion of the edge of the airbag can intersect at the upper end of the straight portion of the edge of the airbag. In the illustrated embodiment, through the special design of the two fold lines 8 and 9, during the inflation of the airbag 100, the unfolding direction of the upper part of the airbag 100 can be well adapted to the angle of the occupant's (dummy's) arm, thereby allowing the airbag 100 to make good contact with the arm and smoothly raise the arm. When folding the airbag 100 in its flattened state, it can be folded first along the first fold line 8, and then along the second fold line 9. The reverse folding sequence is also possible.

[0049] The seat side airbag may include or be connected to a gas generator (not shown). For example, the gas generator may be mounted on the first main body 10 on the occupant side and adjacent to the boundary 3 of the first and second main bodies. The seat side airbag may be located in the region 5 adjacent to the boundary 3 of the first and second main bodies (see...). Figure 3 It is installed into the vehicle seat, such as the frame of the seat back of the vehicle seat.

[0050] When the seat side airbag is activated, the gas generator is activated and produces gas, which is introduced into the air bag 40. Under the guidance of the air bag 40, an airflow is formed in the air bag 40 from top to bottom. After leaving the opening at the bottom of the air bag 40, the airflow can fill the air bag 100 from bottom to top.

[0051] Figures 4 to 6 Different perspective views of the airbag 100 of the seat side airbag when activated are shown, wherein, Figure 4This is a frontal perspective view of the airbag 100 of the seat side airbag in its inflated state. Figure 5 This is a perspective view of the seat side airbag 100 in its inflated state, viewed from the occupant side. Figure 6 A perspective view of the seat side airbag 100 in its inflated state, viewed from the side of the vehicle body.

[0052] As by Figures 4 to 6 As can be seen, in its inflated state, the airbag 100 can be approximately spherical, or nearly spherical, or almost spherical. The inflated airbag 100 includes a first side portion 101 on the passenger side, a second side portion 102 on the vehicle body side opposite the first side portion 101, and a middle portion 103 connecting the first side portion 101 and the second side portion 102. In the lateral direction, the first and second side portions are steep, while the middle portion is gentle.

[0053] The airbag 100 is configured such that, during inflation, a first side portion 101 and a second side portion 102 support a central portion 103, and the central portion 103 raises the occupant's arms. In the inflated state of the airbag 100, at least a majority, e.g., at least three-quarters, of the central portion 103 may be part of a sphere. Particularly advantageously, in the inflated state of the airbag 100, at least a majority (e.g., at least three-quarters) of the central portion 103, the region of the first side portion 101 adjacent to the at least majority of the central portion 103 (e.g., this region occupies a large portion of the area of ​​the first side portion 101, e.g., approximately two-thirds), and the region of the second side portion 102 adjacent to the at least majority of the central portion 103 (e.g., this region occupies a large portion of the area of ​​the second side portion 102, e.g., approximately two-thirds), may be part of a sphere.

[0054] In the illustrated embodiment, the first main sheet 10 is configured to form a first side portion 101 in the inflated state of the air bag 100, the second main sheet 20 is configured to form a second side portion 102 in the inflated state of the air bag 100, and the middle sheet 30 is configured to form a middle portion 103 in the inflated state of the air bag 100.

[0055] Alternatively, in embodiments not shown, the intermediate sheet 30 can be formed from a single sheet with the first main sheet 10 and / or the second main sheet 20 through appropriate cutting.

[0056] Alternatively, in an embodiment not shown, the airbag 100 can be constructed from multiple sheets by appropriate cutting, each sheet providing part or all of any one or more of the first side portion 101, the second side portion 102, and the middle portion 103 of the airbag 100.

[0057] In addition, such as in Figure 4 As can be seen, the first joint 6 and the second joint 7 converge at their respective lower end sections.

[0058] Figure 7 For example Figures 1 to 6 The diagram shown illustrates the application of a seat side airbag in a vehicle, where the seat side airbag has been activated and the airbag 100 is inflated. Figure 7 The image schematically depicts a vehicle seat 50 equipped with side airbags, a dummy's arm 60, and a vehicle body section 70. (As shown by...) Figure 7 As can be seen, in a side collision, the body portion adjacent to the vehicle seat 50 can intrude into the vehicle compartment and thus compress the seat side airbag. More specifically, the airbag 100 is compressed from the second side portion 102 on the body side of the body. During the inflation of the airbag 100, the first main piece 10 on the occupant side and the second main piece 20 on the body side provide support for the intermediate piece 30, allowing the intermediate piece 30 to fully deploy. Compared with the prior art, this increases the contact area between the airbag 100 and the arm, making it easier to lift the arm from the airbag 100 and preventing the arm from easily slipping off the airbag 100. Due to the large contact area of ​​the airbag 100 for the arm, the arm 60 can be reliably lifted, thus avoiding the situation where the arm compresses the ribs of the torso during a side collision, which could potentially cause excessive rib compression.

[0059] It is understood that although the terms "first," "second," etc., may be used here to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0060] Although exemplary examples of the invention have been described for illustrative purposes, the scope of this application is not limited to the specific exemplary embodiments described above. Various modifications can be made by those skilled in the art without departing from the scope and spirit of this application as disclosed in the appended claims. These modifications should also be understood to fall within the scope and spirit of this application.

Claims

1. A seat side airbag comprising an airbag (100), characterized in that, The airbag is single-chambered and spherical when inflated. The airbag includes a first side portion (101) on the occupant side, a second side portion (102) on the vehicle body side opposite to the first side portion, and a middle portion (103) connecting the first side portion and the second side portion. The airbag is configured such that, during the inflation of the airbag, the first side portion and the second side portion support the middle portion, and the middle portion lifts the occupant's arm. The airbag includes a first main sheet (10), a second main sheet (20), and an intermediate sheet (30). The first main sheet is configured to form a first side portion in the inflated state of the airbag. The second main sheet is configured to form a second side portion in the inflated state of the airbag. The intermediate sheet is configured to form an intermediate portion in the inflated state of the airbag. The intermediate sheet is a sheet separate from the first and second main sheets. The intermediate sheet extends elongatedly in a flattened state. The intermediate sheet has a width that gradually increases from its two ends toward its center. The intermediate sheet forms a first seam (6) with the first main sheet at a first longitudinal edge (31). The intermediate sheet forms a second seam (7) with the second main sheet at a second longitudinal edge (32) opposite to the first longitudinal edge. In the inflated state of the airbag, at least a majority of the intermediate portion is part of a sphere.

2. The seat side airbag according to claim 1, characterized in that, The first main sheet and the second main sheet constitute two parts of a single sheet, or the first main sheet and the second main sheet are two separate, interconnected sheets; and / or The first and second master pieces have straight boundaries (3); and / or The first main piece and the second main piece have elliptical or circular outlines in the flattened state, and the outlines of the first main piece and the second main piece form two opposing recesses (11, 12) between each other.

3. The seat side airbag according to claim 1, characterized in that, When the first main piece and the second main piece are stacked in a flattened state, the outline of the first main piece is within the outline of the second main piece, so that when the air bag is inflated, in the lateral direction of the air bag, the seam between the second main piece and the middle piece is higher than the seam between the first main piece and the middle piece.

4. The seat side airbag according to claim 1, characterized in that, When the air bag is flattened, the first main piece and the second main piece are overlapped. The boundary between the first main piece and the second main piece forms a straight first part of the edge of the air bag. The second seam forms an arc-shaped second part that is adjacent to both ends of the first part of the edge of the air bag. The first seam forms an arc line that is adjacent to both ends of the first part of the edge of the air bag and extends inside the edge of the air bag.

5. The seat side airbag according to any one of claims 1 to 4, characterized in that, The air bag has a first fold line (8) and a second fold line (9). When the air bag is flattened, the first fold line, the second fold line, and the straight portion of the edge of the air bag form a right triangle, wherein the first fold line is perpendicular to the straight portion of the edge of the air bag.

6. The seat side airbag according to claim 5, characterized in that, When the air bag is flattened, the first fold line and the second fold line intersect on the arc-shaped portion of the edge of the air bag, and the second fold line intersects with the straight portion of the edge of the air bag at the upper end of the straight portion of the edge of the air bag.

7. The seat side airbag according to any one of claims 1 to 4, characterized in that, The seat side airbag includes an air guide bag (40) disposed inside the airbag, the air guide bag having a lower opening, the air guide bag being configured such that, during the inflation of the airbag, gas input into the air guide bag is guided from top to bottom, and thus airflow exiting from the lower opening of the air guide bag fills the airbag from bottom to top.

8. The seat side airbag according to any one of claims 1 to 4, characterized in that, When the air bag is inflated, the regions of the first side portion that are at least largely adjacent to the middle portion and the regions of the second side portion that are at least largely adjacent to the middle portion are part of a sphere.

9. The seat side airbag according to claim 8, characterized in that, When the airbag is inflated, the area of ​​the first side portion occupies most of the area of ​​the first side portion, and the area of ​​the second side portion occupies most of the area of ​​the second side portion.

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