Vehicle undercarriage

Abstract

The objective is to provide a vehicle understructure that can effectively prevent foreign objects from entering the inside of the floor under cover. [Solution] The cover member 116 of the vehicle understructure 100 includes a floor under cover 120 that covers the underside of the floor 104 and a protector 122 attached to a predetermined area on the front side of the floor under cover 120. The floor under cover 120 has a cover bulge portion 128 that bulges downward so as to be spaced away from the floor 104 and a cover flange portion 130 that is formed around the cover bulge portion 128 and extends along the floor 104. The protector 122 has a protector bulge portion 132 that is along the cover bulge portion 128 and a protector flange portion 134 that is along the cover flange portion 130 and extends at least in the vehicle width direction to form the front edge of the cover member 116.

Description

Technical Field

[0001] The present invention relates to a vehicle underbody structure.

Background Art

[0002] Conventionally, a floor under cover has been attached to the underside of a vehicle floor in order to improve aerodynamic performance. In recent years, a floor under cover using a non-woven fabric with high sound absorption performance as a material has also been adopted for the purpose of further reducing external vehicle noise.

[0003] For example, FIG. 3 of Patent Document 1 discloses a floor under cover 5 that covers the lower surface of a vehicle body. The floor under cover 5 includes a cover body 10 made of a press-molded non-woven fabric and a protector 20 that partially reinforces the cover body 10.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the floor under cover 5 of Patent Document 1, the peripheral seat 14 that forms the front end of the cover body 10 is in an exposed state. Rainwater, snow, etc. splashed up by the front wheel from the front of the vehicle during driving may adhere to the floor under cover 5. In particular, in winter, the attached rainwater or snow may turn into ice and expand, generating a load. Therefore, it is desired to completely prevent foreign substances such as rainwater from entering the inside of the floor under cover.

[0006] In view of such problems, an object of the present invention is to provide a vehicle underbody structure capable of efficiently preventing foreign substances from entering the inside of a floor under cover. [Means for solving the problem]

[0007] To solve the above problems, a typical configuration of the vehicle understructure according to the present invention is a vehicle understructure comprising a vehicle floor and a cover member attached to the underside of the floor, wherein the cover member includes a floor under cover that covers the underside of the floor and a protector attached to a predetermined area in front of the floor under cover, the floor under cover has a cover bulge portion that bulges downward so as to be separated from the floor and a cover flange portion formed around the cover bulge portion and extending along the floor, and the protector has a protector bulge portion along the cover bulge portion and a protector flange portion that extends at least in the vehicle width direction along the cover flange portion and forms the front edge of the cover member. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a vehicle understructure that can efficiently prevent foreign matter from entering the inside of the floor under cover. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows a vehicle understructure according to an embodiment of the present invention. [Figure 2] This figure shows the cover member of Figure 1(b) removed. [Figure 3] This is a view of the protector shown in Figure 2(a) from a different direction. [Figure 4] This is a perspective view of the protector shown in Figure 3(a) from the opposite side. [Figure 5] Figure 3(b) shows cross-sectional views of each cover member. [Figure 6] Figure 3(b) is a cross-sectional view of the cover member. [Modes for carrying out the invention]

[0010] A vehicle understructure according to one embodiment of the present invention is a vehicle understructure comprising a vehicle floor and a cover member attached to the underside of the floor, wherein the cover member includes a floor under cover that covers the underside of the floor and a protector attached to a predetermined area in front of the floor under cover, the floor under cover has a cover bulge portion that bulges downward so as to be separated from the floor and a cover flange portion formed around the cover bulge portion and extending along the floor, and the protector has a protector bulge portion along the cover bulge portion and a protector flange portion that extends at least in the vehicle width direction along the cover flange portion and forms the front end of the cover member.

[0011] With the above configuration, the protector forms the front end of the cover member, making it possible to prevent rainwater, snow, and other elements from entering the floor under cover from the front of the vehicle. In particular, the protector has a three-dimensional shape that follows the cover flange portion to the cover bulge portion of the floor under cover, and has a high second moment of area, making it difficult to deform. Therefore, with the above protector, it is possible to efficiently prevent foreign matter from entering the floor under cover.

[0012] The protector flange portion described above may have a flange front edge portion that extends in the vehicle width direction and forms the front end of the cover member, and a flange slanted edge portion that extends diagonally rearward from the flange front edge portion.

[0013] With the above configuration, the leading edge and slanted edge of the flange of the protector effectively prevent rainwater, snow, and other elements from entering the floor under cover from the front of the vehicle.

[0014] The above protector further has a fitting portion formed on the inside of the protector flange portion into which the cover flange portion can be fitted, and the protector flange portion may cover the bottom surface, end surface, and top surface of the cover flange portion by fitting the cover flange portion into the fitting portion.

[0015] According to the above configuration, the protector can efficiently couple with the floor under cover by fitting the cover flange portion into the fitting portion, and can also efficiently prevent foreign matter from entering the floor under cover.

[0016] The above protector may further have a flange bending portion formed at the tip of the protector flange portion and bent toward the floor side to cover the tip of the cover flange portion.

[0017] According to the above configuration, by covering the tip of the cover flange portion with the flange bending portion of the protector, it becomes possible to efficiently prevent foreign matter from entering the floor under cover.

[0018] The above cover member may further have a first fixing portion formed in a range where the cover flange portion and the protector flange portion overlap and in a state where the cover flange portion and the protector flange portion are integrally fixed to the floor.

[0019] According to the above first fixing portion, by tightly fastening the floor under cover and the protector to the floor, etc., it becomes possible to assemble the floor under cover and the protector to the floor with high rigidity.

[0020] The above protector may further have ribs provided across the protector bulging portion and the protector flange portion.

[0021] According to the above configuration, by providing ribs, it becomes possible to improve the rigidity of the protector alone and also enhance the mounting rigidity of the protector with respect to the floor under cover.

[0022] The above floor has a flat floor panel and side members protruding downward from the floor panel and extending in the vehicle front-rear direction, the floor under cover covers the lower sides of the floor panel and the side members, and the protector flange portion may extend across the floor panel and the side members.

[0023] In the area of ​​the floor described above where the shape changes across the floor panel and side members, foreign objects can easily enter through the gap with the floor under cover. By placing a protector in this area, it becomes possible to effectively prevent foreign objects from entering the floor under cover.

[0024] The cover member described above may further have a second fixing portion formed in a range where the floor under cover and the protector flange portion overlap with the side member, so that the floor under cover and the protector flange portion are integrally fixed to the side member.

[0025] According to the second fixing part described above, by fastening the floor under cover and protector together to the side member, it becomes possible to assemble the floor under cover and protector to the side member with high rigidity.

[0026] The above-mentioned protector may have a fan shape that gradually widens towards the front of the vehicle.

[0027] The fan-shaped protector described above forms a wide area at the front end of the cover member, making it possible to effectively prevent foreign objects from entering the floor under cover. This will become possible. [Examples]

[0028] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values ​​shown in these embodiments are merely illustrative to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0029] Figure 1 shows a vehicle understructure 100 according to an embodiment of the present invention. Figure 1(a) shows the underside of a vehicle 102 on which the vehicle understructure 100 is implemented.

[0030] In the following, in Figure 1 and all other drawings of this application, the front-rear direction of the vehicle is illustrated by arrows F (Forward) and B (Backward), the left-right direction in the vehicle width direction is illustrated by arrows L (Leftward) and R (Rightward), and the up-down direction of the vehicle is illustrated by arrows U (Upward) and D (Downward).

[0031] The vehicle understructure 100 comprises the floor 104 of the vehicle 102 and cover members 116 and 118 attached to the underside of the floor 104. The cover members 116 and 118 are members that protect the underside of the floor 104 and are provided in pairs on the left and right sides in the vehicle width direction.

[0032] The floor 104 consists of a floor panel 106 and side members 108 and 110. The floor panel 106 is a roughly flat floor plate. The side members 108 and 110 are structural members of the vehicle 102 and are provided in pairs on the left and right ends in the vehicle width direction. The side members 108 and 110 extend in the vehicle's longitudinal direction while protruding downward from the floor panel 106.

[0033] The cover member 116 is composed of a relatively large floor under cover 120 and a protector 122 attached to the floor under cover 120.

[0034] The floor under cover 120 is a component that broadly covers the underside of the floor panel 106 and side member 108. The protector 122 is attached to the front end portion of the floor under cover 120.

[0035] The cover member 118, like the cover member 116, is also composed of a floor under cover 124 and a protector 126. Since the cover members 116 and 118 have the same symmetrical configuration, the following explanation will mainly use the cover member 116 on the right side of the vehicle as an example.

[0036] Figure 1(b) is a magnified view of the area near the front end of the cover member 116 in Figure 1(a).

[0037] The protector 120 is located slightly towards the center in the vehicle width direction, behind the front wheel 112. This position is prone to contact with foreign objects such as rainwater and snow while driving. By positioning the protector 120 at this front end of the cover member 116, the floor under cover 120 is protected from collision and intrusion of foreign objects.

[0038] Figure 2 shows the cover member 116 removed from Figure 1(b). Figure 2(a) is a perspective view of the cover member 116 from the front.

[0039] The floor under cover 120 is made of a highly sound-absorbing nonwoven fabric and has the function of reducing high-frequency sounds such as vehicle engine noise and road noise. The protector 122 is mainly made of a highly rigid resin and is attached to the front end of the floor under cover 120 to protect the floor under cover 120 from impacts and foreign objects.

[0040] Figure 2(b) shows the floor under cover 120 with the protector 122 removed, as shown in Figure 2(a).

[0041] The floor under cover 120 is composed of a cover flange portion 130 that is in contact with the floor 104 (see Figure 1(b)) and a cover bulge portion 128 that is spaced apart from the floor 104.

[0042] The cover bulge 128 is a portion that bulges downward so as to be separated from the floor 104 (see Figure 1(b)). The cover bulge 128 includes a floor panel covering portion 136 that covers the floor panel 106 and a side member covering portion 138 that covers the side member 108.

[0043] The side member covering portion 138 is formed to extend in the longitudinal direction of the vehicle along the side member 108 (see Figure 1(a)). The floor panel covering portion 136 is the portion of the cover bulge portion 128 other than the side member covering portion 138, and is broadly formed on the floor under cover 120.

[0044] The cover flange portion 130 is a flange-shaped portion formed around the cover bulge portion 128 and extends along the floor 104 (see Figure 1(b)). The cover flange portion 130 is provided with connection points at various locations for connection to the floor panel 106 and the side member 108.

[0045] The protector 122 is mounted on the front part of the floor under cover 120, adjacent to the side member 108. The protector 122 has a three-dimensional shape, comprising a protector bulge portion 132 and a protector flange portion 134.

[0046] The protector bulge 132 is the part that covers the cover bulge 128 and has a shape that bulges out along the cover bulge 128.

[0047] The protector flange portion 134 is the part that covers the cover flange portion 130 and is formed in a flange shape along the cover flange portion 130. In particular, the protector flange portion 134 has at least a portion that extends in the vehicle width direction and forms the front end of the cover member 116.

[0048] Furthermore, the cover member 116 does not need to be mounted so that the protector 122 is precisely overlapped with the floor under cover 120. For example, a portion of the protector 122 may extend beyond the area of ​​the floor under cover 120, or a region of the floor under cover 120 covered by the protector 122 may have a cutout or the like that reduces the amount of material used.

[0049] Figure 3 shows the protector 122 of Figure 2(a) from a different direction. Figure 3(a) is a perspective view of the protector 122 of Figure 2(a) from the front.

[0050] The protector 122 has a connecting portion 140 that connects to the floor under cover 120. The connecting portion 140 can be embodied as a through hole and a rivet. The connecting portion 140 connects the rear end of the protector bulge 132 to the cover bulge 128 of the floor under cover 120.

[0051] The protector flange portion 134 has a three-dimensional shape that extends across the floor panel 106 and the side member 108.

[0052] The flange front edge portion 146 is the part of the protector flange portion 134 that forms the front end of the cover member 116. The flange front edge portion 146 extends in the vehicle width direction and covers the front end of the cover flange portion 130 of the floor under cover 120 (see Figure 2(b)).

[0053] The flange slanted edge portion 148 is the part of the protector flange portion 134 that extends diagonally rearward outward in the vehicle width direction from the flange front edge portion 146. The flange slanted edge portion 148 covers the part of the cover flange portion 130 of the floor under cover 120 (see Figure 2(b)) that extends diagonally from the front end.

[0054] The protector 122 is able to cover the tip of the cover flange portion 130 of the floor under cover 120 (see Figure 2(b)) with its flange leading edge portion 146 and flange slanted edge portion 148. This configuration allows the protector 122 to effectively prevent rainwater, snow, and other elements from entering the floor under cover 120 from the front of the vehicle.

[0055] The protector flange portion 134 also includes the flange vertical wall portion 150 and the flange extension portion 152.

[0056] The flange vertical wall portion 150 is the part of the protector flange portion 134 that extends along the vertical wall of the side member covering portion 138 of the floor under cover 120.

[0057] The flange extension portion 152 is the part of the protector flange portion 134 that extends along the lower side of the side member covering portion 138 of the floor under cover 120.

[0058] The protector 122 is easily positioned on the floor under cover 120 because its flange vertical wall portion 150 and flange extension portion 152 three-dimensionally cover the side member covering portion 138 of the floor under cover 120.

[0059] The protector flange portion 134 is also provided with a fixing portion for the floor 104 (see Figure 1(b)), which serves as a cover member 116.

[0060] The first fixing portion 142 is provided on the flange front edge portion 146. The first fixing portion 142 is formed in the area where the flange front edge portion 146 and the cover flange portion 130 (see Figure 2(b)) overlap, and can be embodied, for example, as a through hole and a fastener. With the first fixing portion 142, the flange front edge portion 146 and the cover flange portion 130 are integrally fixed to the floor panel 106 (see Figure 1(b)).

[0061] According to the first fixing part 142, the floor under cover 120 and the protector 122 can be fastened together to the floor panel 106 with bolts, etc., thereby enabling the floor under cover 120 and the protector 122 to be assembled to the floor panel 106 (see Figure 1(b)) with high rigidity.

[0062] The second fixing portion is provided on the flange extension portion 152. The second fixing portion 144 is formed in the area where the floor flange extension portion 152 and the floor under cover 120 overlap, and can be embodied, for example, as a through hole and a fastener. At the second fixing portion 144, the floor flange extension portion 152 and the floor under cover 120 are integrally fixed to the side member 108.

[0063] The second fixing part 144 allows the floor under cover 120 and the protector 122 to be bolted together to the side member 108, thereby enabling the floor under cover 120 and the protector 122 to be assembled to the side member 108 with high rigidity. In particular, the side member 108 has high rigidity within the floor 104 (see Figure 1(b)). By providing the second fixing part 144 in an area that overlaps with the side member 108, the mounting rigidity of the protector 122 can also be improved.

[0064] The protector 122 has multiple ribs 154. The ribs 154 are provided across the flange slanted edge 148 and the protector bulge 132 so as to fill the inner angle between the flange slanted edge 148 and the protector bulge 132. By providing the ribs 154, the rigidity of the protector 122 itself can be improved, as well as the mounting rigidity of the protector 122 to the floor under cover 120.

[0065] Figure 3(b) is a view of the protector 122 shown in Figure 2(a) from above.

[0066] The protector 122 has a fan shape that gradually widens towards the front of the vehicle. For example, the protector bulge 132 of the protector 122 gradually widens from near the rear end where the connecting portion 140 is provided towards the front protector flange portion 134.

[0067] The protector flange portion 134 forms the front end of the cover member 116 over a wide area in the vehicle width direction. In this way, the fan-shaped protector 122 forms a wide area of ​​the front end of the cover member 116, making it possible to effectively prevent foreign matter from entering the floor under cover 120.

[0068] In other words, the protector 122 has a protector flange portion 134 that is wide in the vehicle width direction, and the protector bulge portion 132 becomes narrower towards the rear. Therefore, the protector 122 can prevent foreign matter from entering by widening the protector flange portion 134 at the front, while reducing the shape of the protector bulge portion 132 at the rear, thereby reducing weight and cost.

[0069] Figure 4 is a perspective view of the protector 122 in Figure 3(a) from the opposite side. Figure 4(a) is a perspective view of the protector 122 in Figure 3(a) from above, i.e., from the floor under cover 120 side.

[0070] A flange curved portion 160 is formed in a part of the protector flange portion 134. The flange curved portion 160 is mainly formed on the upper side of the flange slanted edge portion 148 (see Figure 3(a)), and is an extension of the tip of the flange slanted edge portion 148 while curving it.

[0071] The inside of the flange curved portion 160 is a fitting portion 162. The fitting portion 162 is the part into which the protector flange portion 130 is fitted.

[0072] Figure 4(b) shows the protector 122 from Figure 4(a) attached to the floor under cover 120.

[0073] The protector 120 can be efficiently connected to the floor under cover 120 by fitting the cover flange portion 130 into the mating portion 160. In particular, even when the protector 122 is connected by a single connection portion 140, fitting the cover flange portion 130 into the mating portion 160 prevents it from rotating relative to the floor under cover 120. In other words, it is possible to unitize the protector 122 and the floor under cover 120 by connecting them with only a single connection portion 140.

[0074] The fitting portion 160 allows the cover member 116 to accurately align the protector 122 with respect to the floor under cover 120, thereby improving the mounting rigidity of the protector 120.

[0075] A positioning rib 156 is provided on the upper side of the protector 120. As shown in Figure 4(a), the positioning rib 156 is provided on the upper side of the protector flange portion 134 of the protector 120. The positioning rib 156 rises from the protector flange portion 134 in a curved, wall-like shape.

[0076] As shown in Figure 4(b), the positioning rib 156 contacts a notch 158 formed on the edge of the floor under cover 120. The contact of the positioning rib 156 with the notch 158 of the floor under cover 120 prevents the protector 122 from rotating relative to the floor under cover 120, even when connected by a single joint 140.

[0077] The positioning rib 156 also allows the cover member 116 to accurately align the protector 122 with respect to the floor under cover 120, thereby improving the mounting rigidity of the protector 120.

[0078] Figure 5 shows cross-sectional views of the cover member 116 in Figure 3(b). Figure 5(a) is a cross-sectional view AA of the cover member 116 in Figure 3(b).

[0079] The protector bulge 132 of the protector 122 has a smooth, three-dimensional shape without sharp corners, following the cover bulge 128 of the floor under cover 120. This smooth, three-dimensional shape allows the protector 122 to deflect impacts during driving and protect the floor under cover 120.

[0080] The protector 122 is fastened and secured to the floor under cover 120 and the floor panel 106 by the first fixing portion 142 of the protector flange portion 134. By fastening the protector 122 together, it is possible to prevent rainwater and snow from entering around the fixing point more effectively than when the floor under cover 120 is fastened to the floor panel 106 alone.

[0081] In this embodiment, the protector flange portion 134 of the protector 122 is formed to protrude forward from the cover flange portion 130 of the floor under cover 120. That is, the protector flange portion 134 is configured to cover the tip of the cover flange portion 130. As a result, the protector flange portion 134 can prevent rainwater and snow from entering the tip of the cover flange portion 130.

[0082] In particular, rainwater and snow that seep in through the cover flange portion 130 may later turn into ice and expand in volume, potentially adding load to the fastening points or creating gaps between the cover flange portion 130 and the floor panel 106. The protector 122 improves the rigidity of the first fixing portion 142 and protects the cover flange portion 130, preventing rainwater and snow from entering the inside of the floor under cover 120, and also effectively distributing impacts during driving and loads caused by ice expansion.

[0083] In the vehicle understructure 100 shown in Figure 1(a), protectors 122 and 126 locally constitute the front ends of cover members 116 and 118 behind the front wheels 112 and 114, thereby effectively preventing rainwater, snow, and other elements from entering the floor undercovers 120 and 124 from the front of the vehicle while driving.

[0084] In particular, the protectors 122 and 126 have a three-dimensional shape that follows the cover flange portion 130 to the cover bulge portion 128 of the floor under cover 120 as shown in Figure 2(b), and have a high second moment of area, making them resistant to deformation. Therefore, the protectors 122 and 126 can effectively prevent foreign matter from entering the floor under covers 120 and 124.

[0085] Figure 5(b) is a cross-sectional view of the cover member 116 of Figure 3(b).

[0086] The protector 122 can be efficiently connected to the floor under cover 120 by fitting the cover flange portion 130 of the floor under cover 120 into the mating portion 162.

[0087] The protector flange portion 134 has a flange curved portion 160, which covers the lower surface 130a, end surface 130b, and upper surface 130c of the cover flange portion 130. As a result, the protector 120 is able to prevent rainwater and snow from entering between the cover flange portion 130 and the floor panel 106.

[0088] Here, the rib 154 shown in Figure 3(a) is located below the area where the flange curved portion 160 in Figure 5(b) is provided. In other words, the rigidity of the protector flange portion 134 is improved by the rib 154 at the area having the flange curved portion 160 and the fitting portion 162. Therefore, the protector flange portion 134 can be assembled with high rigidity by fitting it with the cover flange portion 130.

[0089] Figure 6 is a cross-sectional view of the cover member 116 in Figure 3(b).

[0090] The cover flange portion 130 of the floor under cover extends along the side wall of the side member 108. The flange vertical wall portion 150 of the protector 122 extends along the side member 108 together with the cover flange portion 130.

[0091] The protector flange portion 134 has a flange vertical wall portion 150 and a flange extension 152 (see Figure 3(a)), so that it extends across the floor panel 106 and the side member 108.

[0092] In Figure 1(b), the area of ​​the floor 104 where the shape changes across the floor panel 106 and side member 108 is prone to foreign matter entering through the gap with the floor under cover 120. Therefore, as shown in Figure 6, the vehicle understructure 100 has a protector 122 placed in this area, which effectively prevents foreign matter from entering the floor under cover 120.

[0093] As shown in Figure 6, the flange vertical wall portion 150 has a flange bend portion 164 at its tip. The flange bend portion 164 is bent in a direction toward the side member 108 from the tip of the flange vertical wall portion 150, and is able to cover the tip of the cover flange portion 130.

[0094] The flange bend portion 164 covers the tip of the cover flange portion 130, preventing rainwater, snow, and other elements from entering the floor under cover 120 through the gap between the cover flange portion 130 and the side member 108. The flange bend portion 164 can also be provided on the flange front edge portion 146, the flange slanted edge portion 148, and the flange extension portion 152 in Figure 3(b). The flange bend portion 164 makes it possible to efficiently prevent rainwater and snow from entering the floor under cover 120.

[0095] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. [Industrial applicability]

[0096] This invention can be used in the undercarriage of a vehicle. [Explanation of symbols]

[0097] 100...Vehicle understructure, 102...Vehicle, 104...Floor, 106...Floor panel, 108...Side member, 110...Side member, 112...Front wheel, 116...Cover member, 118...Cover member, 120...Floor under cover, 122...Protector, 124...Floor under cover, 126...Protector, 128...Cover bulge, 130...Cover flange, 130a...Bottom surface, 130b...End surface 130c...Top surface, 132...Protector bulge, 134...Protector flange, 136...Floor panel covering, 138...Side member covering, 140...Joint, 144...Second fixing part, 146...Flange front edge, 148...Flange slanted side, 150...Flange vertical wall, 152...Flange extension, 154...Rib, 156...Positioning rib, 158...Notch, 160...Bent part, 162...Fitting part, 164...Bend

Claims

1. In a vehicle understructure comprising a vehicle floor and a cover member attached to the underside of the floor, The cover member is A floor under cover that covers the underside of the floor, This includes a protector attached to a predetermined area on the front side of the floor under cover, The aforementioned floor under cover is, A cover bulge that protrudes downward so as to be separated from the floor, It has a cover flange portion formed around the bulging portion of the cover and extending along the floor, The aforementioned protector is The protector bulge along the aforementioned cover bulge, A vehicle understructure characterized by having a protector flange portion that runs along the cover flange portion and extends at least in the vehicle width direction to form the front end of the cover member.

2. The protector flange portion is, The flange front edge portion extending in the vehicle width direction and forming the front end of the cover member, The vehicle understructure according to claim 1, characterized in that it has a flange slanted edge portion extending diagonally rearward from the flange front edge portion.

3. The protector further has a fitting portion formed on the inside of the protector flange portion into which the cover flange portion can be fitted, The vehicle understructure according to claim 1 or 2, characterized in that the protector flange portion covers the lower surface, end surface, and upper surface of the cover flange portion by fitting the cover flange portion into the fitting portion.

4. The vehicle understructure according to claim 1 or 2, characterized in that the protector further has a flange bend portion formed at the tip of the protector flange portion, which bends toward the floor side and covers the tip of the cover flange portion.

5. The vehicle understructure according to claim 1 or 2, further characterized in that the cover member has a first fixing portion formed in an area where the cover flange portion and the protector flange portion overlap, so that the cover flange portion and the protector flange portion are integrally fixed to the floor.

6. The vehicle understructure according to claim 1 or 2, further characterized in that the protector has ribs provided across the protector bulge portion and the protector flange portion.

7. The aforementioned floor is Flat floor panels, It includes a side member that protrudes downward from the floor panel and extends in the longitudinal direction of the vehicle, The floor under cover covers the lower side of the floor panel and the side member, The vehicle understructure according to claim 1 or 2, characterized in that the protector flange portion extends across the floor panel and the side member.

8. The vehicle understructure according to claim 7, further characterized in that the cover member has a second fixing portion formed in a range where the floor under cover and the protector flange portion overlap the side member, and the floor under cover and the protector flange portion are integrally fixed to the side member.

9. The vehicle understructure according to claim 1 or 2, characterized in that the protector has a fan shape that gradually widens toward the front of the vehicle.

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