Vehicle underbody structure

Abstract

The invention provides a vehicle bottom structure which can improve the rigidity of a vehicle body and restrain the height of a vehicle body floor. The vehicle underbody structure includes a floor panel in which a vehicle compartment is formed; the side beam is arranged on the outer side of the floor panel in the width direction of the vehicle and extends in the front-back direction of the vehicle; and a floor cross member extending in the vehicle width direction and having an end connected to the side member, in which an outer end portion of the floor panel in the vehicle width direction is formed lower in the vehicle vertical direction than a center portion of the floor panel in the vehicle width direction, and an outer end portion of the floor panel in the vehicle width direction is formed lower in the vehicle vertical direction than a center portion of the floor panel in the vehicle width direction. The floor beam piece is located above the floor panel in the vertical direction of the vehicle, and the floor beam piece and the outer side end of the floor panel are away from each other.

Description

Technical Field

[0001] The invention relates to a vehicle bottom structure. Background Art

[0002] In order to allow the elderly, the disabled, and children, who are relatively vulnerable groups, to use a sustainable transportation system, efforts are made to provide a means of transportation with better vehicle comfort. In the prior art, a deformation area for absorbing collision force is provided in the bottom structure of the vehicle, which is roughly located on the upper part and the outer side of the side beam. In this way, the height of the vehicle floor near the floor cross member is formed to be higher and protruding. In order to solve the above-mentioned problem, the present invention aims to improve the rigidity of the vehicle body and further provide a sustainable transportation system. Summary of the invention

[0003] The present invention provides a vehicle bottom structure which can improve the rigidity of a vehicle body and suppress the height of a vehicle body floor.

[0004] The vehicle bottom structure of the present invention includes a floor panel forming a vehicle compartment; a side beam arranged on the outer side of the floor panel in the vehicle width direction and extending in the front-rear direction of the vehicle; and a floor cross member extending along the vehicle width direction and having its end connected to the side beam, wherein the outer end of the floor panel in the vehicle width direction is formed lower in the vehicle up-down direction than the center of the floor panel in the vehicle width direction, and the floor cross member is located above the floor panel in the vehicle up-down direction, and the floor cross member and the outer end of the floor panel are away from each other.

[0005] In an embodiment of the present invention, a lower surface of the side beam is joined to the floor panel, and an upper surface of the side beam is joined to the floor cross member.

[0006] In an embodiment of the present invention, a bracket is provided at the outer end portion of the floor panel at a distance above the vehicle vertical direction, and the bracket is formed on a lower surface of the floor cross member.

[0007] In an embodiment of the present invention, the floor cross member includes a main body portion and a fragile portion, the fragile portion is provided at an end portion of the main body portion in the vehicle width direction, and the fragile portion is away from the floor panel.

[0008] In an embodiment of the present invention, the side member includes an inner member formed by joining a hat-shaped inner outer member and a hat-shaped inner inner member to form an inner closed section, and the inner closed section overlaps the floor cross member in the vehicle width direction.

[0009] In an embodiment of the present invention, the side beam further includes an outer member, the outer member covers the inner member, wherein the inner member and the outer member are formed with inclined portions that are inclined upward in the vertical direction of the vehicle as approaching a center pillar.

[0010] In an embodiment of the present invention, a plurality of the floor cross members are formed in the front-rear direction of the vehicle, and in the viewing angle in the vehicle width direction, the upper end of the inclined portion is disposed between the plurality of the floor cross members.

[0011] In an embodiment of the present invention, the floor panel includes a frame and a power unit housing, the frame is arranged on the outside of the power unit housing in the vehicle width direction, and the upper surface of the frame is formed to be lower than the upper surface of the power unit housing in the upper and lower directions of the vehicle, the frame is engaged with the flange portion of the power unit housing, and the flange portion extends from the power unit housing toward the outside of the vehicle width direction.

[0012] In an embodiment of the present invention, a battery component extending along the vehicle width direction is arranged inside the power unit housing, and a cross-section of the battery component is formed into two vertical sides and a horizontal side connecting the two vertical sides, and the horizontal side and the flange portion form a straight line in the vehicle width direction.

[0013] In an embodiment of the present invention, the floor panel includes a frame and a power unit housing, the frame is arranged on the outside of the power unit housing in the vehicle width direction, and the upper surface of the frame is formed to be lower than the upper surface of the power unit housing in the upper and lower directions of the vehicle, the frame includes an upper frame and a lower frame, and the upper frame and the lower frame are joined to form a closed cross-section, and the inner end of the lower frame in the vehicle width direction is joined to the upper frame at a position away from the power unit housing.

[0014] In an embodiment of the present invention, the vehicle bottom structure also includes a lower supporting member, which is engaged with the lower surface of the lower frame and the lower surface of the power unit housing, and the length of the lower supporting member in the front-rear direction of the vehicle is smaller than the length of the lower frame in the front-rear direction of the vehicle.

[0015] Based on the above, in the vehicle bottom structure of the present invention, the floor panel and the floor cross member are separated from each other in the vertical direction of the vehicle near the side beam, thereby forming a crushing space for deformation and absorbing the load when a side impact occurs. In addition, since the floor panel near the side beam sinks downward, the height of the floor cross member can still form a crushing space without any change, thereby suppressing the height of the vehicle body. Accordingly, the vehicle bottom structure of the present invention can improve the rigidity of the vehicle body and suppress the height of the vehicle body floor.

[0016] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top schematic diagram of a vehicle bottom structure according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line AA.

[0019] Figure 3A It is a partial side view schematic diagram of the side beam of the vehicle bottom structure of this embodiment.

[0020] Figure 3B yes Figure 3A Schematic diagram of the interior of the side beam.

[0021] Figure 4 yes Figure 1 A cross-sectional view of the vehicle bottom structure along the BB section line.

[0022] Figure 5 1 is a schematic top view of a power unit housing of a vehicle bottom structure of this embodiment.

[0023] Figure 6 yes Figure 5 Cross-sectional view of the power unit casing along the CC section line.

[0024] Figure 7 It is a partial bottom view schematic diagram of the vehicle bottom structure of this embodiment.

[0025] Description of Reference Numerals

[0026] 100: vehicle bottom structure;

[0027] 110: Floor panel;

[0028] 112: frame (outer end);

[0029] 112a: upper frame;

[0030] 112b: lower frame;

[0031] 114: power unit housing (central part);

[0032] 114a: flange portion;

[0033] 114b: battery components;

[0034] 120: side beam;

[0035] 122: internal parts;

[0036] 122a: internal and external components;

[0037] 122b: internal components;

[0038] 124: External parts;

[0039] 130: floor beam;

[0040] 132: Ontology;

[0041] 134: Vulnerable Ministry;

[0042] 140: bracket;

[0043] 150: lower supporting member;

[0044] BS: Crushing space;

[0045] CP: central column;

[0046] E1: vertical edge;

[0047] E2: horizontal edge;

[0048] K: inner end;

[0049] L1, L2: length;

[0050] S1: internal closed section;

[0051] S2: closed section;

[0052] T: inclined part;

[0053] X: vehicle width direction;

[0054] Y: front and rear direction of the vehicle;

[0055] Z: The vehicle's up and down direction. DETAILED DESCRIPTION

[0056] Figure 1 It is a top schematic diagram of a vehicle bottom structure according to an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line AA. Figure 3A It is a partial side view schematic diagram of the side beam of the vehicle bottom structure of this embodiment. Figure 3B yes Figure 3A Schematic diagram of the interior of the side beam. Figure 4 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line BB. Figure 5 1 is a schematic top view of a power unit housing of a vehicle bottom structure of this embodiment. Figure 6 yes Figure 5 Cross-sectional view of the power unit casing along the CC section line. Figure 7 It is a partial bottom view schematic diagram of the vehicle bottom structure of the present embodiment. In the present embodiment, the vehicle bottom structure 100 is, for example, a bottom structure used in an ordinary passenger car (not shown), but the present invention is not limited thereto and can also be used in other types of vehicles. The vehicle width direction X, the vehicle front-to-rear direction Y, and the vehicle up-down direction Z in the accompanying drawings are not used to limit the positional relationship of the various components in the present invention. In addition, it should be noted that, unless otherwise specified, the rear and the top used in the following specification are the directions indicated by the arrows in the vehicle front-to-rear direction Y and the vehicle up-to-down direction Z, and the front and the bottom used in the specification are the opposite directions of the aforementioned; the inside and the outside used in the specification refer to the relative position in the vehicle width direction X, and the direction indicated by the arrow in the vehicle width direction X is not used to limit the inside or the outside. Whenever possible, the same element symbols are used in the drawings and descriptions to represent the same or similar parts. The following will be matched with Figures 1 to 7 A vehicle bottom structure 100 according to the present embodiment will be described.

[0057] Please refer to Figure 1 In this embodiment, the vehicle bottom structure 100 includes a floor panel 110, a side beam 120, and a floor cross member 130. The floor panel 110 forms a vehicle compartment (not shown), and the vehicle compartment is located above the floor panel 110 in the vehicle vertical direction Z, but since it is a conventional content, the present invention will not be described in detail here. The floor panel 110 can be divided into an outer end portion 112 located on the outer side and a central portion 114 located on the central side in the vehicle width direction X, wherein the outer end portion 112 is a frame body 112 described later, and the central portion 114 is a power unit housing 114 described later, and the central portion 114 is formed as a substantially flat surface. The side beam 120 is arranged on the outer side of the floor panel 110 in the vehicle width direction X and extends toward the vehicle front-rear direction Y. The floor cross member 130 extends along the vehicle width direction X and the end portion is connected to the side beam 120.

[0058] Furthermore, if Figure 2 As shown, the outer end portion 112 of the floor panel 110 in the vehicle width direction X is formed below the center portion 114 of the floor panel 110 in the vehicle width direction X in the vehicle vertical direction Z. That is, a step is formed between the outer end portion 112 and the center portion 114. The floor cross member 130 is disposed above the floor panel 110 in the vehicle vertical direction Z, wherein the floor cross member 130 and the outer end portion 112 of the floor panel 110 are separated from each other in the vehicle vertical direction Z to form a crushing space BS, and the floor cross member 130 and the center portion 114 of the floor panel 110 are close to each other in the vehicle vertical direction Z.

[0059] It can be seen that in the vehicle bottom structure 100 of the present embodiment, the floor panel 110 and the floor cross member 130 are separated from each other in the vehicle vertical direction Z near the side member 120, thereby forming a crushing space BS for deformation and absorbing load when a side impact occurs. In addition, since the floor panel 110 near the side member 120 sinks downward, the height of the floor cross member 130 remains unchanged and still forms a crushing space BS, thereby suppressing the height of the vehicle body. Accordingly, the vehicle bottom structure 100 of the present embodiment can improve the rigidity of the vehicle body and suppress the height of the vehicle body floor.

[0060] Further, in this embodiment, the lower surface of the side beam 120 is joined to the floor panel 110, and the upper surface of the side beam 120 is joined to the floor cross member 130. More specifically, the lower surface of the outer member 124 of the side beam 120 is joined to the outer end 112 of the floor panel 110, and the upper surface of the outer member 124 of the side beam 120 is joined to the end of the floor cross member 130. By joining the side beam 120 in a manner of sandwiching the side beam 120 from top to bottom, the load can be surely transferred to the outer end 112 and the floor cross member 130 when a side collision occurs, thereby ensuring that deformation occurs in the crushing space BS to absorb the impact.

[0061] Furthermore, in the present embodiment, a bracket 140 is provided at the outer end 112 of the floor panel 110 at a distance from the upper side in the vehicle vertical direction Z. The bracket 140 is formed on the lower surface of the floor cross member 130 to improve the rigidity of the floor cross member 130. In addition, the floor cross member 130 includes a main body 132 and a fragile portion 134. The fragile portion 134 is formed in a shape that is easy to deform, such as a groove, and is provided at an end of the main body 132 in the vehicle width direction X, for example, an end close to the outer side, but the present invention is not limited thereto. The fragile portion 134 is away from the floor panel 110 (outer end 112) in the vehicle vertical direction Z. Therefore, when a collision occurs, the fragile portion 134 and the floor panel 110 are deformed to absorb the impact, thereby improving the safety of the vehicle body.

[0062] Furthermore, in the present embodiment, the side beam 120 includes an inner member 122 and an outer member 124. The inner member 122 is formed by, for example, joining a cap-shaped inner outer member 122a and a cap-shaped inner inner member 122b in the vehicle width direction X, thereby forming an inner closed section S1. The inner closed section S1 overlaps with the floor cross member 130 in the vehicle width direction X. In this way, the rigidity of the side beam 120 can be enhanced to prevent the section from being crushed. The outer member 124 covers the inner member 122 and can also be formed by joining two cap-shaped members, but the present invention is not limited thereto.

[0063] like Figure 3A as well as Figure 3BAs shown, in this embodiment, the inner member 122 and the outer member 124 are formed with an inclined portion T that is inclined upward in the vehicle vertical direction Z as they approach the center pillar CP. As a result, the side surface at a location that receives a large impact load (for example, near the center pillar CP) is enlarged, and the height of the side member 120 in the vehicle vertical direction Z away from the center pillar CP can be suppressed, thereby improving the rigidity and the comfort of passengers getting on and off the vehicle.

[0064] Preferably, if Figure 1 as well as Figure 4 As shown, the floor cross member 130 is formed in a plurality of positions in the vehicle front-rear direction Y, for example, two positions, but the present invention is not limited thereto. Figure 4 ), the upper end of the inclined portion T of the side beam 120 is disposed between a plurality of floor cross members 130. Since the seat (not shown) in the vehicle is mounted on the floor cross member 130 via a seat bracket (not shown), and the seat is disposed at a position higher than the height of the side beam 120 in the vehicle vertical direction Z, the height of the floor cross member 130 needs to be raised to correspond to the height of the inclined portion T (the higher position in the side beam 120), thereby increasing the cross section of the floor cross member 130 and improving the rigidity. Although Figure 4 Only the inclined portion T of the outer member 124 is illustrated, but the position of the inclined portion T of the inner member 122 is substantially the same as that of the outer member 124 , and thus is not illustrated separately.

[0065] Please come back Figure 2 In this embodiment, the floor panel 110 includes a frame 112 and a power unit housing 114. As mentioned above, the frame 112 is arranged on the outer side of the power unit housing 114 in the vehicle width direction X, so that the frame 112 is deformed after being hit by the side to reduce the deformation of the power unit housing 114 located on the relatively inner side. In detail, the power unit housing 114 is, for example, the housing of an intelligent power unit (IPU) to protect the intelligent power unit located therein. In addition, the power unit housing 114 is assembled below the body frame (partially shown), wherein the body frame is, for example, formed by the side beam 120, the front panel (not shown, for example, a high-strength material such as a heat-treated material, etc.), and the rear component (not shown). For example, the power unit housing 114 is installed on the floor cross member 130, and then installed on the side beam 120 by a connecting component (such as the frame 112), and the body frame and the power unit housing 114 are sealed to prevent water intrusion. In addition, the power unit housing 114 and the vehicle body frame are fastened together by means of screws or bolts, for example, but the present invention is not limited thereto.

[0066] In addition, in the present embodiment, the upper surface of the frame 112 is formed to be lower than the upper surface of the power unit housing 114 in the vehicle vertical direction Z (i.e., formed as the aforementioned step difference). The frame 112 is joined to the flange portion 114a of the power unit housing 114, wherein the flange portion 114a extends from the power unit housing 114 toward the outside of the vehicle width direction X, and is joined to the frame 112 by screws or bolts, but the present invention is not limited thereto. In this way, it is possible to ensure that the load of the side impact is transmitted to the power unit housing 114 through the frame 112, thereby improving the rigidity. Moreover, the upper surface connected to the frame 112 makes it easier for the floor panel 110 to deform to absorb the impact, thereby avoiding the collapse space BS from losing its function due to excessive rigidity. At the same time, after the frame 112 is connected to the power unit housing 114, the number of parts can be reduced compared to the prior art to further ensure the internal space.

[0067] In addition, the frame 112 includes an upper frame 112a and a lower frame 112b. The upper frame 112a and the lower frame 112b are joined to form a closed cross section S2, and the inner end K of the lower frame 112b in the vehicle width direction X is joined to the upper frame 112 at a position away from the power unit housing 114. By joining at a position away from the power unit housing 114, the increase in rigidity in the crushing space BS can be reduced, and a certain rigidity difference is formed between the side beam 120 to make it easier to deform the crushing space BS. In addition, the inner end K of the lower frame 112b is away from the power unit housing 114, which can make the support rigidity of the upper frame 112a higher.

[0068] Please refer to Figure 2 , Figure 5 ,as well as Figure 6 In this embodiment, a battery component 114b extending along the vehicle width direction X is provided inside the power unit housing 114. The battery component 114b is used to fix the power unit such as the battery (not shown) in the power unit housing 114, and Figure 6 As shown, the cross section of the battery component 114b is formed into two vertical sides E1 and a horizontal side E2 connecting the two vertical sides E1, similar to an H shape. Figure 2 As shown, the lateral side E2 and the flange portion 114a form a straight line in the vehicle width direction X. Thus, the battery component 114b can bear the load transmitted from the frame 112 and the power unit case 114 through the flange portion 114a, thereby improving the overall rigidity and suppressing deformation.

[0069] Please refer to Figure 1 , Figure 2 ,as well as Figure 7 In this embodiment, the vehicle bottom structure 100 further includes a lower support member 150. Figure 2As shown, the lower support member 150 is engaged with the lower surface of the lower frame 112b and the lower surface of the power unit housing 114 to further ensure that the power unit housing 114 is supported by the frame 112. Figure 7 As shown, the length L2 of the lower support member 150 in the vehicle front-rear direction Y is smaller than the length L1 of the lower frame 112b in the vehicle front-rear direction Y, so as to suppress the increase in rigidity caused by the overlap of the lower support member 150 and the crushing space BS and reduce the cross-section of the lower support member 150 as much as possible.

[0070] In summary, in the vehicle bottom structure of the present invention, the floor panel and the floor cross member are separated from each other in the vertical direction of the vehicle near the side beam, thereby forming a crushing space for deformation and absorbing load when a side impact occurs. In addition, since the floor panel near the side beam sinks downward, the height of the floor cross member can still form a crushing space without any change, thereby suppressing the height of the vehicle body. In addition, the frame (i.e., the outer end of the floor panel) is arranged on the outside of the power unit housing (i.e., the central part of the floor panel) in the vehicle width direction, so that the frame is deformed after a side impact to reduce the deformation of the power unit housing located on the relatively inner side. Accordingly, the vehicle bottom structure of the present invention can improve the rigidity of the vehicle body and suppress the height of the vehicle body floor.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle bottom structure, characterized in that: include: A floor panel, forming a vehicle compartment; A side beam, arranged on the outer side of the floor panel in the vehicle width direction and extending in the front-rear direction of the vehicle; as well as A floor cross member extends along the vehicle width direction and has an end connected to the side beam, wherein The outer end portion of the floor panel in the vehicle width direction is formed lower in the vehicle vertical direction than the center portion of the floor panel in the vehicle width direction. The floor cross member is located above the floor panel in the up-down direction of the vehicle, and the floor cross member and the outer side ends of the floor panel are away from each other.

2. The vehicle bottom structure according to claim 1, characterized in that: The lower surface of the side member is joined to the floor panel, and the upper surface of the side member is joined to the floor cross member.

3. The vehicle bottom structure according to claim 1, characterized in that: A bracket is provided at the outer end of the floor panel so as to be spaced above the vehicle in the vertical direction. The bracket is formed on a lower surface of the floor cross member.

4. The vehicle bottom structure according to claim 1, characterized in that: The floor cross member comprises a main body portion and a fragile portion, The fragile portion is provided at an end portion of the body portion in the vehicle width direction, and the fragile portion is separated from the floor panel.

5. The vehicle bottom structure according to claim 1, characterized in that: The side beam includes an inner member, the inner member is formed with an inner closed section by joining a hat-shaped inner outer member and a hat-shaped inner inner member, and The inner closed cross section overlaps the floor cross member in the vehicle width direction.

6. The vehicle bottom structure according to claim 5, characterized in that: The side beam further comprises an outer part, wherein the outer part covers the inner part, wherein The inner member and the outer member are formed with inclined portions that are inclined upward in the vehicle vertical direction as they approach the center pillar.

7. The vehicle bottom structure according to claim 6, characterized in that: The floor cross member is formed in a plurality in the front-rear direction of the vehicle, In the viewing angle in the vehicle width direction, the upper end of the inclined portion is disposed between the plurality of floor cross members.

8. The vehicle bottom structure according to claim 1, characterized in that: The floor panel includes a frame and a power unit housing, the frame is arranged outside the power unit housing in the vehicle width direction, and the upper surface of the frame is formed to be lower than the upper surface of the power unit housing in the vehicle vertical direction, The frame is joined to a flange portion of the power unit case, and the flange portion extends from the power unit case toward the outside in the vehicle width direction.

9. The vehicle bottom structure according to claim 8, characterized in that: A battery component extending in the vehicle width direction is disposed inside the power unit housing. The cross section of the battery component is formed into two vertical sides and a horizontal side connecting the two vertical sides. The lateral side and the flange portion form a straight line in the vehicle width direction.

10. The vehicle bottom structure according to claim 1, characterized in that: The floor panel includes a frame and a power unit housing, the frame is arranged outside the power unit housing in the vehicle width direction, and the upper surface of the frame is formed to be lower than the upper surface of the power unit housing in the vehicle vertical direction, The frame includes an upper frame and a lower frame, and the upper frame and the lower frame are joined to form a closed cross section. An inner end portion of the lower frame in the vehicle width direction is joined to the upper frame at a position away from the power unit case.

11. The vehicle bottom structure according to claim 10, characterized in that: It also includes a lower support member, the lower support member is engaged with the lower surface of the lower frame and the lower surface of the power unit housing, and The length of the lower support member in the vehicle front-rear direction is smaller than the length of the lower frame in the vehicle front-rear direction.

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