JP2023177834A - Lower vehicle body structure for vehicle - Google Patents

Abstract

To provide a lower vehicle body structure for a vehicle that is able to enhance the protection performance of a fuel tank more securely with a simple structure.SOLUTION: A fuel tank and a protective member disposed at a position facing one surface of the fuel tank intersecting a horizontal first direction are provided. The protective member includes: a pre-contact portion extending along a horizontal second direction orthogonal to the first direction, at least a part of which is disposed below the fuel tank; a pair of connecting portions respectively extending upward from both ends of the pre-contact portion in the second direction and having upper end parts coupled to a vehicle body; and a pair of reinforcing members connecting the pre-contact portion and each connecting portion in the vicinity of both ends of the pre-contact portion in the second direction. The reinforcing members are respectively joined to surfaces of the pre-contact portion and connecting portions, which surfaces are opposite to a surface facing the one surface of the fuel tank.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lower body structure of a vehicle.

As disclosed in Patent Document 1, in a vehicle in which the fuel tank is provided at the bottom, a protection member (protection bar in Patent Document 1) is provided on the side of the fuel tank in order to prevent the fuel tank from coming into contact with the road surface. is being considered.

Specifically, in Patent Document 1, the front and rear ends of a protection member (protection bar in Patent Document 1) bent downward in a crank shape are fixed to the lower surface of the rear side frame, and the intermediate portion of the protection member is fixed to the lower surface of the rear side frame. A configuration is disclosed in which the fuel tank is disposed below the rear side frame and at approximately the same height as the bottom of the fuel tank.

According to the configuration of Patent Document 1, the intermediate portion of the protective member is disposed at the above position, so that when the vehicle passes over a road surface difference, etc., the intermediate portion of the protective member comes into contact with the step, etc. The fuel tank can be kept separated from the step, etc., and contact between the fuel tank and the step, etc. can be prevented.

JP 2016-2783 Publication

Here, in the configuration in which the protection member is disposed on the side of the fuel tank as described above, in order to improve the protection performance of the fuel tank, it is preferable to increase the rigidity of the protection member. On the other hand, it is conceivable to increase the thickness and size of the protective member, for example. However, simply increasing the overall size and thickness of the protective member shortens the distance between the fuel tank and the protective member, causing a problem in that they tend to come into contact with each other.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a lower vehicle body structure for a vehicle that can improve the protection performance of a fuel tank with a simple configuration.

In order to solve the above problems, the present invention provides a fuel tank having one surface (a surface extending in the vertical direction) that intersects with a horizontal first direction, and a fuel tank disposed at a position facing the one surface of the fuel tank. a protection member, the protection member includes a tip portion extending along a horizontal second direction perpendicular to the first direction and at least a portion of which is disposed below the fuel tank; a pair of connecting portions each extending upward from both ends in the second direction of the abutment portion and having upper end portions coupled to the vehicle body; and a pair of connecting portions that are connected to the abutment portion in the vicinity of both ends of the abutment portion in the second direction; and a pair of reinforcing members connecting the respective parts, and when the protective member has a surface facing the one surface of the fuel tank as an inner surface and a surface opposite thereto as an outer surface, each of the reinforcing members: It is characterized in that it is joined to an outer surface of the abutting portion and each of the connecting portions, respectively.

In the present invention, the protective member is disposed at a position facing the vertically extending surface that intersects with the first horizontal direction of the fuel tank, and at least a portion of the protective member is larger than the fuel tank. A lower abutting portion is provided. Therefore, the road surface and the fuel tank can be maintained in a separated state due to the contact between the abutment part and the road surface, and the fuel tank can be prevented from being damaged due to contact with the road surface.

Furthermore, in the present invention, each connecting portion extending upward from both ends of the front abutment portion and coupled to the vehicle body and the front abutment portion are connected by reinforcing members in the vicinity of both ends of the front abutment portion. Therefore, the load applied to the front abutment part from the road surface can be released to the connecting part via the reinforcing member, and further to the vehicle body via the connecting part. As a result, deformation of the abutment part and the protection member can be suppressed, that is, the rigidity thereof can be increased. Further, in the present invention, the reinforcing member is joined to the outer surface of the abutting portion and each connecting portion, which is the surface facing away from the fuel tank. Therefore, even if the protective member is deformed toward the fuel tank, the reinforcing member can be prevented from coming into contact with the fuel tank. Therefore, according to the present invention, the protection performance of the fuel tank by the protection member can be improved with a simple configuration in which the reinforcing member configured as described above is provided on the protection member.

In the above structure, preferably, the tip part and each of the connecting parts are formed integrally with each other by bending one cylindrical member, and the connecting part between the tip part and the connecting part is disconnected. The area is smaller than the cross-sectional area of the other portions of the abutting portion and the connecting portion excluding the connecting portion.

According to this configuration, the abutting portion and each connecting portion can be easily formed by bending one cylindrical member. Moreover, by making the cross-sectional area of the connecting portion between the tip part and the connecting part smaller than these other areas, the angle formed by the tip part and the connecting part can be made closer to 90 degrees. In other words, the distance between the two connecting parts can be reduced. Therefore, the protection member can be made compact and the layout around the protection member can be improved. However, if the cross-sectional area of the connecting portion between the abutment part and the connecting part is made smaller, the rigidity will be lowered. In contrast, in the present invention, as described above, the reinforcing member suppresses deformation of the connection portion, so that it is possible to maintain high protection performance for the fuel tank while improving layout properties.

In the configuration, preferably each of the reinforcing members has a plate shape.

According to this configuration, the volumes of the reinforcing member and the protective member can be kept small and the layout properties can be reliably improved.

In the above configuration, preferably, the fuel tank is disposed such that a rear portion of the fuel tank in the longitudinal direction of the vehicle overlaps with the rear wheel when viewed along the vehicle width direction, and the protection member is preferably arranged so that the rear portion of the fuel tank overlaps the rear wheel when viewed along the vehicle width direction. It is placed in front of the wheel.

According to this configuration, the rear wheel prevents the rear portion of the fuel tank from coming into contact with the road surface, and the protection member prevents the front portion of the fuel tank from coming into contact with the road surface. Therefore, the entire fuel tank can be protected more reliably.

In the configuration, preferably, the first direction is a vehicle width direction, and the second direction is a vehicle longitudinal direction.

According to this configuration, it is possible to prevent obstacles from coming into contact with the fuel tank from the outside in the vehicle width direction.

In the configuration, preferably, a pair of protection members are provided on both sides of the fuel tank in the vehicle width direction.

According to this configuration, even when the vehicle is tilted in the vehicle width direction, contact between the road surface and the fuel tank can be reliably prevented.

In the configuration, preferably, the vehicle body has a rear side frame extending in the vehicle longitudinal direction on a side of the fuel tank in the vehicle width direction, and the connecting portion located on the front side in the vehicle longitudinal direction is attached to the rear side frame. combined.

According to this configuration, the protection member can be supported on the vehicle body using the rear side frame.

In the configuration, preferably, the vehicle body includes a rear side frame extending along the longitudinal direction of the vehicle on a side of the fuel tank in the vehicle width direction, and a gusset frame connected to a rear part of the rear side frame, The connecting portion located on the rear side in the front-rear direction is coupled to the gusset frame.

According to this configuration, the protection member can be supported on the vehicle body using the gusset frame connected to the rear part of the rear side frame.

As explained above, according to the vehicle lower body structure of the present invention, the protection performance of the fuel tank can be improved with a simple configuration.

FIG. 3 is a bottom view showing a part of the rear part of the vehicle. FIG. 3 is a side view showing a part of the rear part of the vehicle. 2 is an enlarged view of a part of FIG. 1. FIG. It is a schematic side view which expanded and showed a part of vehicle rear part. FIG. 2 is a schematic perspective view of a part of the rear part of the vehicle, viewed diagonally from below. It is a side view which showed a part of protection member. It is a side view which showed a part of protection member. 7 is a sectional view taken along line VIII-VIII in FIG. 6. FIG.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic bottom view showing a part of the rear part of a vehicle V to which a lower vehicle body structure according to an embodiment of the present invention is applied. FIG. 2 is a schematic side view showing a part of the rear part of the vehicle V. FIG. 3 is an enlarged view of a part of FIG. FIG. 4 is a schematic side view showing an enlarged part of the rear part of the vehicle V. FIG. 5 is a schematic perspective view of a part of the rear part of the vehicle V, viewed diagonally from below. In the following description, the longitudinal direction of the vehicle will be referred to as the longitudinal direction, and the vehicle width direction as viewed from the front will be referred to as the left-right direction. The vehicle longitudinal direction (front-back direction) corresponds to the "second direction" in the claims, and the vehicle width direction (left-right direction) corresponds to the "first direction" in the claims.

(Schematic configuration of the rear of the vehicle)
A pair of rear side frames 2, 2 that extend in the front-rear direction and constitute part of the vehicle body are provided on both left and right sides of the vehicle V. The configurations of the two rear side frames 2, 2 are symmetrical. Each rear side frame 2 extends to near the front end of the rear wheel 1. The portion of each rear side frame 2 excluding the rear end portion 2a extends substantially horizontally. On the other hand, the rear end portions 2a of each rear side frame 2 are curved so as to be positioned upward toward the rear. That is, the rear end portion 2a of each rear side frame 2 is curved diagonally upward toward the rear. In this embodiment, each rear side frame 2 includes a plate-shaped first rear side frame 12a extending substantially horizontally, and a plate-shaped second rear side frame 12b extending upward from the inner edge of the first rear side frame 12a in the vehicle width direction. , and a plate-shaped third rear side frame 12c extending outward in the vehicle width direction from the upper edge of the second rear side frame 12b. A wheel house panel 8 that surrounds the rear wheel 1 extends rearward from the rear end of each rear side frame 2.

A floor panel 4 that constitutes the floor surface of the vehicle interior is provided between the two rear side frames 2, 2. A fuel tank 6 for storing fuel is provided below the floor panel 4 and in the space between the rear side frames 2, 2. In other words, each of the rear side frames 2, 2 extends in the front-rear direction on both sides of the fuel tank 6 in the left-right direction.

The fuel tank 6 is disposed below the floor panel 4 and is fixed to a cross member (not shown) provided on the floor panel 4 and extending in the left-right direction. The fuel tank 6 extends from a position in front of the rear wheel 1 to a position behind the front end of the rear wheel 1 in the front-rear direction, and the rear part of the fuel tank 6 extends from a position in front of the rear wheel 1 to a position behind the front end of the rear wheel 1. ) overlaps with rear wheel 1. The left-right dimension of the fuel tank 6 is set to be slightly smaller than the distance between the two rear side frames 2, 2 in the left-right direction. It occupies most of the area between. The vertical dimension of the fuel tank 6 is such that when the fuel tank 6 is fixed below the floor panel 4, the lower end of the fuel tank 6 is located below the lower end of each rear side frame 2 and the lower end of each gusset frame 30, which will be described later. It is set as follows. That is, the fuel tank 6 is fixed to a cross member (not shown) provided on the floor panel 4 and extending in the left-right direction so as to protrude downward from the lower end of each rear side frame 2 and each gusset frame 30.

The vehicle V is provided with a pair of left and right protection members 40, 40 for protecting the fuel tank 6. These protection members 40 are arranged on both left and right sides of the fuel tank 6. The configuration of the protection member 40 will be described later.

A plate-shaped gusset frame 30 is fixed to the lower surface of each rear side frame 2. Specifically, the vehicle V is provided with a pair of left and right gusset frames 30, 30. The configurations of the two gusset frames 30, 30 are symmetrical.

Each rear side frame 2 has a gusset frame for fixing a gusset frame 30 in the vicinity of the boundary between the rear end portion 2a of the portion that curves diagonally upward rearward as described above and the portion on the front side of the portion. A fixing portion 2c is provided respectively. A front end portion of a gusset frame 30 is fixed to each gusset frame fixing portion 2c, and each gusset frame 30 extends substantially horizontally rearward from the gusset frame fixing portion 2c. Specifically, the front end portion of the right gusset frame 30 is fixed to the gusset frame fixing portion 2c of the right rear side frame 2, and extends substantially horizontally rearward from the right gusset frame fixing portion 2c. Further, the left gusset frame 30 has its front end fixed to the gusset frame fixing part 2c of the left rear side frame 2, and extends substantially horizontally rearward from the left gusset frame fixing part 2c.

Further, each gusset frame fixing portion 2c is located in front of the rear wheel 1, and each gusset frame 30 is located in a position ranging from a position in front of the rear wheel 1 to a position behind the front end of the rear wheel 1. It extends to

A suspension frame 20 is provided at the rear of the vehicle V to support a suspension (not shown) of a pair of left and right rear wheels 1 (only the right rear wheel 1 is shown in the figure). The suspension frame 20 includes a pair of left and right subframes 21, 21, and a rear suspension cross 22 extending left and right between these subframes 21, 21.

The rear suspension cross 22 is located behind the fuel tank 6. That is, the fuel tank 6 is disposed in an area surrounded by the pair of rear side frames 2 and the rear suspension cross 22.

Each subframe 21 is connected to the rear side frame 2 via a gusset frame 30, respectively. Specifically, the right subframe 21 is connected to the right rear side frame 2 via the right gusset frame 30, and the left subframe 21 is connected to the left rear side frame 2 via the left gusset frame 30. is connected to. Each subframe 21 extends rearward from a position on the rear side of the rear end of the rear side frame 2, passing below the wheel house panel 8 extending rearward from the rear side frame 2 to which it is connected.

In the present embodiment, a bush holding portion 21a is provided at the front end of each subframe 21 and has a substantially columnar shape extending in the vertical direction and holds a bush, and the bush holding portion 21a is located at the rear end of the gusset frame 30. It is fixed to the part. Each bush holding portion 21a is disposed between the rear end of the gusset frame 30 and the support panel 25 disposed above it, and is connected to the rear end of the gusset frame 30 and the support panel 25. Fixed.

(protective member)
Next, the configuration of the protection member 40 will be explained. FIG. 6 is a side view of a part of the protection member 40 viewed from the outside in the vehicle width direction. FIG. 7 is a side view of a part of the protection member 40 viewed from inside in the vehicle width direction. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

As described above, each protection member 40 is disposed on both left and right sides of the fuel tank 6, respectively. Each protection member 40 is disposed at a position facing each side surface of the fuel tank 6 in the left and right direction, which extends in the up and down direction and intersects with the front and back direction. That is, the right protection member 40 is disposed on the right side of the fuel tank 6 and facing the right side surface 6a of the fuel tank 6, and the left protection member 40 is disposed on the left side of the fuel tank 6. It is disposed at a position facing the left side surface 6b of the fuel tank 6. Further, each protection member 40 is disposed forward of the rear wheel 1, respectively. The right side 6a and left side 6b of the fuel tank 6 described above correspond to "one side of the fuel tank" in the claims.

The structure of the right protection member 40 and its surroundings is symmetrical with the structure of the left protection member 40 and its surroundings, and below, the structure of the right protection member 40 and its surroundings will be mainly described.

The protection member 40 has a tip portion 101 extending in the front-rear direction. Further, the protection member 40 has a pair of front and rear connecting portions 102 (102a, 102b) that extend upward from both ends of the front and back portion 101 in the front and back direction, respectively. Specifically, the protection member 40 includes a front connecting portion 102a extending upward from the front end of the tip portion 101 and a rear connecting portion 102b extending upward from the rear end of the tip portion 101. Furthermore, the protection member 40 includes a pair of front and rear reinforcing members 120 (120a, 120b) that connect the front and back portions 101 and the connecting portions 102a, 102b, respectively, near both front and rear ends of the front and back ends of the front and back ends. Specifically, the protection member 40 includes a front reinforcing member 120a that connects the front end portion 101 and the front connecting portion 102a near the front end of the front end portion 101, and a front reinforcing member 120a that connects the front end portion 101 and the front connecting portion 102a near the rear end of the front end portion 101. It has a rear reinforcing member 120b that connects to the rear connecting portion 102b.

The tip portion 101 has a substantially cylindrical shape extending in the front-rear direction. The tip portion 101 extends substantially horizontally. The tip portion 101 is disposed at a position where a portion thereof is below the fuel tank 6. In this embodiment, the tip part 101 is arranged so that the height position of its vertical center and the height position of the lower edge of the fuel tank 6 substantially match. The tip part 101 extends in the front-rear direction along the right side surface 6a of the fuel tank 6 at a position on the right side of the fuel tank 6 and spaced to the right from the right side surface 6a of the fuel tank 6. Note that the tip portion 101 of the protection member 40 disposed on the left side of the fuel tank 6 is located on the left side of the fuel tank 6 at a position spaced to the left from the left side surface 6b of the fuel tank 6. 6b in the front-rear direction.

Each of the connecting portions 102 (102a, 102b) has a substantially cylindrical shape extending in the vertical direction, and extends from an end of the front abutment portion 101 in the front-rear direction to near the center of the fuel tank 6.

The tip portion 101 and the two connecting portions 102 (102a, 102b) are integrally formed with each other. In this embodiment, the tip portion 101 and the two connecting portions 102 (102a, 102b) are formed by bending a round pipe, that is, a cylindrical member.

Specifically, by bending the round pipe at two places in its axial direction, a tip portion 101 is formed in the middle of the round pipe, and a front connecting portion 102a and a rear connecting portion 102b are formed on both sides of the tip portion 101, respectively. Ru. Two places in the axial direction of the round pipe are bent while being crushed, and the connecting portion 110 between the front end portion 101 and each connecting portion 102 (102a, 102b) (between the front end portion 101 and the front side connecting portion 102a) The two bent portions of the round pipe constituting the connecting portion 110a and the connecting portion 110b between the tip portion 101 and the rear connecting portion 102b each have a flat outer shape. In other words, the cross-sectional shape of the tip portion 101 and the two connecting portions 102 (102a, 102b) excluding the connecting portion 110 (110a, 110b) is the same as the cross-sectional shape of the round pipe, that is, it is approximately circular. On the other hand, the cross-sectional shape of the connecting portion 110 (110a, 110b) between the tip portion 101 and each connecting portion 102 (102a, 102b) is a substantially rectangular shape extending in the horizontal direction. In addition, the cross-sectional area of the connecting portion 110 (110a, 110b) between the tip portion 101 and each connecting portion 102 (102a, 102b) is The area is smaller than the cross-sectional area of the other parts except for the part 110 (110a, 110b).

Specifically, the cross-sectional area of the front end of the front end part 101, which constitutes the connection part 110a between the front part 101 and the front connecting part 102a, gradually becomes smaller toward the front, and The cross-sectional area of the lower end of the front connecting portion 102a gradually decreases downward. Further, the cross-sectional area of the rear end portion of the tip portion 101 that constitutes the connecting portion 110b between the tip portion 101 and the rear connecting portion 102b gradually decreases toward the rear, and The cross-sectional area of the lower end of the rear connecting portion 102b gradually decreases downward. In other words, the connecting portions 110 (110a, 110b) between the tip portion 101 and each connecting portion 102 (102a, 102b) are, as described above, portions where the round pipe is crushed, and the cross-sectional area thereof is This is the part that has been made smaller than the cross-sectional area of the original round pipe.

Here, the bending angle of the round pipe at each connecting portion 110 (110a, 110b) is approximately 90 degrees, and each connecting portion 102 (102a, 102b) extends approximately vertically upward from both ends of the front and back direction of the tip portion 101. It is extending. Further, in this embodiment, the round pipe is bent along an arc, and each connecting portion 110 (110a, 110b) has a shape that extends outward and follows an arc.

A horizontally extending plate-shaped front flange 130 is joined to the upper end of the front connecting portion 102a. A horizontally extending plate-shaped rear flange 140 is joined to the upper end of the rear connecting portion 102b. For example, each connecting portion 102 (102a, 102b) and each flange 130, 140 are joined by welding.

The front flange 130 is coupled to the rear side frame 2. Specifically, the front flange 130 is disposed along the lower surface of the first rear side frame 12a and fastened thereto with bolts 90. The rear flange 140 is coupled to the front end of the gusset frame 30. Specifically, the rear flange 140 is disposed along the lower surface of the gusset frame 30 and fastened thereto with bolts 90. By these fastenings, each connecting portion 102 (102a, 102b) and the protection member 40 are supported by the rear side frame and the gusset frame 30.

As described above, each reinforcing member 120 (120a, 120b) connects the tip portion 101 and each connecting portion 102 (102a, 102b) near both front and rear ends of the tip portion 101, respectively. That is, the front reinforcing member 120a connects the front end of the tip portion 101 and the lower end of the front connecting portion 102a, and the rear reinforcing member 120b connects the rear end of the tip portion 101 and the rear connecting portion. 102b is connected to the lower end. Each reinforcing member 120 is a plate-like member. In this embodiment, a metal plate-like member having a substantially trapezoidal outer shape is used as the reinforcing member 120. Each reinforcing member 120 (120a, 120b) is joined to the tip part 101 and each connecting part 102 (102a, 102b) in a posture such that its front and back surfaces are perpendicular to the left-right direction and its thickness direction is coincident with the left-right direction. has been done.

The front reinforcing member 120a is joined to a portion (front end portion) of the tip part 101 that is slightly away from the front end of the front end portion (front end portion) and a portion (lower end portion) of the front connecting portion 102a that is slightly away from the lower end of the front end portion (lower end portion). By doing so, the tip portion 101 and the front connecting portion 102a are connected. The front reinforcing member 120a extends obliquely forward and upward from the front end of the tip portion 101 toward the lower end of the front connecting portion 102a. In this embodiment, the rear end portion of the front reinforcing member 120a is the rear end portion of the front connecting portion 110a (the connecting portion 110a between the tip portion 101 and the front connecting portion 102a), that is, the front portion of the tip portion 101. It is joined at the part where the cross-sectional area begins to decrease towards the end. Further, the upper end of the front reinforcing member 120a is joined to the upper end of the front connecting portion 110a, that is, the portion of the front connecting portion 102a whose cross-sectional area begins to decrease downward.

The rear reinforcing member 120b includes a portion (rear end portion) of the tip portion 101 that is slightly away from the rear end and a portion (lower end portion) that is slightly away from the lower end of the rear connecting portion 102b. By being joined to, the front part 101 and the rear connecting part 102b are connected. The rear reinforcing member 120b extends rearward and diagonally upward from the rear end of the tip portion 101 toward the lower end of the rear connecting portion 102b. In this embodiment, the rear end portion of the rear reinforcing member 120b is the front end portion of the rear connecting portion 110b (the connecting portion 110b between the tip portion 101 and the rear connecting portion 102b), that is, the rear end portion of the tip portion 101. It is joined at the part where the cross-sectional area begins to decrease towards the rear. Further, the upper end portion of the rear reinforcing member 120b is joined to the upper end portion of the rear connecting portion 110b, that is, the portion of the rear connecting portion 102b whose cross-sectional area begins to decrease downward.

The front reinforcing member 120a is joined to the side surface of the tip portion 101 and the front connecting portion 102a on the side opposite to the fuel tank in the left-right direction. Similarly, the rear reinforcing member 120b is joined to the side surface of the tip portion 101 and the rear connecting portion 102b on the side opposite to the fuel tank in the left-right direction.

Specifically, the front reinforcing member 120a (rear reinforcing member 120b) of the right protection member 40 is joined to the right side of the abutment part 101 and the front connection part 102a (rear connection part 102b) of the right protection member 40. has been done. In other words, regarding the right protection member 40, when the surface facing the right side surface 6a of the fuel tank 6 is the inner surface and the opposite surface is the outer surface, the front reinforcing member 120a of the right protection member 40 is The rear reinforcing member 120b of the protection member 40 on the right side is joined to the outer surface of the front part 101 and the front connecting part 102a of the protection member 40. It is joined to the outer surface of 102b.

Further, the front reinforcing member 120a (rear reinforcing member 120b) of the left protection member 40 is joined to the left side surface of the tip part 101 and the front connection part 102a (rear connection part 102b) of the left protection member 40. There is. That is, regarding the left protection member 40, when the surface facing the left side surface 6b of the fuel tank 6 is the inner surface and the opposite surface is the outer surface, the front reinforcing member 120a of the left protection member 40 is The rear reinforcement member 120b of the left protection member 40 is joined to the outer surface of the front part 101 and the front connecting part 102a of the protection member 40, and the rear reinforcing member 120b of the left protection member 40 is joined to the front part 101 and the rear connection part 102a of the left protection member 40. It is joined to the outer surface of 102b.

In the present embodiment, the front reinforcing member 120a has an upper portion (two vertically (the upper part when divided) and the rear part of the side surface of the front connecting part 102a on the side opposite to the fuel tank (the rear part when divided into two parts front and back). In addition, the rear reinforcing member 120b has an upper part (divided into two upper and lower parts) of the side surface of the anti-fuel tank side of the front part 101 (the right side surface for the right side protection member 40 and the left side surface for the left side protection member 40). (the upper part of the rear connecting part 102b) and the front part of the side surface of the rear connecting part 102b on the side opposite to the fuel tank (the front part when it is divided into two parts, front and rear).

In this embodiment, each reinforcing member 120 (120a, 120b) is joined by welding to the tip portion 101 and each connecting portion 102 (102a, 102b).

(effect, etc.)
As described above, in the vehicle lower body structure according to the embodiment, the protection members 40 are provided at positions facing both side surfaces 6a and 6b of the fuel tank 6 in the left and right direction. Each protection member 40 includes a pair of front and rear connecting portions 102 (102a, 102b) that are fastened to the left and right rear side frames 2 and the gusset frame 30 and extend downward from these, and lower ends of the connecting portions 102 (102a, 102b). A tip portion 101 extending in the front-rear direction is provided, and the tip portion 101 is disposed such that a portion of the tip portion 101 is located below the fuel tank 6. Therefore, contact between the fuel tank 6 and the road surface can be reliably prevented.

Specifically, since a part of the front abutment part 101 is located below the fuel tank 6, when the vehicle V passes over a level difference formed on the road surface, the front abutment part 101 does not interfere with the level difference or the like. By contacting the fuel tank 6, it is possible to maintain the level difference and the fuel tank 6 apart from each other. Further, in the embodiment described above, the two protection members 40 are disposed at positions facing the left and right side surfaces 6a and 6b of the fuel tank 6, respectively. Therefore, even when the vehicle V is tilted in the vehicle width direction, the position of the tip portion 101 of one protection member 40 can be maintained at a position closer to the road surface than the fuel tank 6. Therefore, contact between the fuel tank 6 and the road surface can be reliably prevented. Therefore, according to the embodiment described above, the protection member 40 can reliably prevent the fuel tank 6 from coming into contact with the road surface. Further, according to the above embodiment, even when an obstacle collides with the vehicle V from the side in the vehicle width direction, the protection member 40 prevents the obstacle from coming into contact with the fuel tank 6. can be more securely protected.

Furthermore, in the embodiment described above, the tip portion 101 and each connecting portion 102 (102a, 102b) are connected by the reinforcing member 120 (120a, 120b), respectively, near both ends of the tip portion 101 in the front-rear direction. Therefore, the load applied from the road surface to the front abutment part 101 is transferred to the connecting part 102 (102a, 102b) via the reinforcing member 120 (120a, 120b), and further through the connecting part 102 (102a, 102b). It can escape to the rear side frame 2 and the gusset frame 30. This makes it possible to suppress deformation of the tip portion 101 and, by extension, the protection member 40. In other words, the rigidity of the protection member 40 can be increased. Therefore, the protection member 40 can more reliably prevent the fuel tank 6 from coming into contact with the road surface or the like.

Further, in the embodiment described above, each reinforcing member 120 (120a, 120b) is joined to the side surface of the tip portion 101 and each connecting portion 102 (102a, 102b) on the side opposite to the fuel tank. Therefore, even if the protective member 40 is deformed toward the fuel tank 6 side due to a load being applied to the protective member 40 from the side opposite to the fuel tank, the reinforcing members 120 (120a, 120b) will come into contact with the fuel tank 6. You can prevent it from happening.

Further, in the embodiment described above, the tip part 101 and each connecting part 102 (102a, 102b) are formed integrally with each other by bending one round pipe. Therefore, the tip part 101 and each connecting part 102 (102a, 102b) can be easily formed on the protective member 40.

Further, in the above embodiment, the round pipe is bent at two places in the axial direction while being crushed, that is, the connecting portion 110 (110a, 110b) between the tip part 101 and each connecting part 102 (102a, 102b) By making the cross-sectional area of the front abutment part 101 and each connection part 102 (102a, 102b) smaller than the other cross-sectional areas excluding the connection part 110 (110a, 110b), the front abutment part 101 and each connection part 102 (102a, 102b) The angle formed by the portions 102 (102a, 102b) is approximately 90 degrees. Therefore, the distance between the two connecting portions 102 (102a, 102b) in the front-rear direction can be kept short over the entire vertical direction, and the protective member 40 can be made compact. Therefore, the layout around the protection member 40 and the fuel tank 6 can be improved. However, if the cross-sectional area of the connecting portion 110 (110a, 110b) between the abutting portion 101 and the connecting portion 102 (102a, 102b) is reduced in this way, the rigidity of the protection member 40 will be reduced. In contrast, in the embodiment described above, the rigidity of the protection member 40 is increased by the reinforcing members 120 (120a, 120b) as described above, so that high protection performance for the fuel tank 6 can be achieved while improving layout properties. .

Furthermore, in the above embodiment, the reinforcing members 120 (120a, 120b) are made of plate-like members, so that the volume of the protective member 40 is kept small, and this also makes it possible to improve the layout.

Further, in the embodiment described above, the fuel tank 6 is arranged so that its rear part overlaps the rear wheel 1 in a side view, and the protection member 40 is arranged ahead of the rear wheel 1. Therefore, since the rear wheel 1 can prevent the rear part of the fuel tank 6 from coming into contact with the road surface, and the protection member 40 can prevent the front part of the fuel tank 6 from coming into contact with the road surface, the entire fuel tank 6 can be protected more reliably. .

Further, in the embodiment described above, the front connecting portion 102a is supported by the rear side frame 2. Therefore, by using the rear side frame 2, the protection member 40 can be held at a position facing the side surface of the fuel tank 6 as described above.

Further, in the embodiment described above, the rear connecting portion 102b is supported by the gusset frame 30. Therefore, the protection member 40 can be held in a position facing the side surface of the fuel tank 6 as described above by using the gusset frame 30.

(Modified example)
In the above embodiment, a case has been described in which the tip part 101 and each connecting part 102 (102a, 102b) are integrally formed by a round pipe, but they may be formed separately and each member may be welded or the like. They may be joined to each other.

In the embodiment described above, a case has been described in which the angle between the tip part 101 and each connecting part 102 (102a, 102b) is approximately 90 degrees, but the angle is not limited to this.

Furthermore, the vehicle body members that support each of the connecting portions 102 (102a, 102b) and the protection member 40 are not limited to the rear side frame 2 and the gusset frame 30. Further, the positional relationship between the rear wheel 1 and the protection member 40 is not limited to the above.

Further, in the above embodiment, a case has been described in which the protection member 40 is provided on both left and right sides of the fuel tank 6 (both sides in the vehicle width direction), but the protection member 40 is provided only on one side of the fuel tank 6 in the left and right direction. may be provided. Further, the protection member 40 may be provided on one side or both sides of the fuel tank 6 in the longitudinal direction (vehicle longitudinal direction).

1 Rear wheel 6 Fuel tank 20 Rear side frame (vehicle body)
30 Gusset frame (vehicle body)
40 Protective member 101 Priority member 102 Connecting portion 120 Reinforcing member

Claims (8)

a fuel tank having one surface that intersects with a horizontal first direction;
a protection member disposed at a position facing the one surface of the fuel tank,
The protection member includes a tip portion extending along a horizontal second direction orthogonal to the first direction and at least a portion of which is disposed below the fuel tank, and a tip portion extending in the second direction of the tip portion. a pair of connecting portions each extending upward from both ends thereof and whose upper end portions are coupled to the vehicle body; and a pair of connecting portions connecting the tip portion and each of the connecting portions in the vicinity of both ends of the tip portion in the second direction. Equipped with reinforcing members,
Regarding the protection member, when the surface opposite to the one surface of the fuel tank is the inner surface and the opposite surface is the outer surface, each of the reinforcing members is provided on the outer surface of the abutting portion and each of the connecting portions. A lower body structure of a vehicle, characterized in that the lower body structure is joined to each other. The lower body structure of a vehicle according to claim 1,
The tip part and each of the connecting parts are formed integrally with each other by bending one cylindrical member,
A lower part of a vehicle, wherein a cross-sectional area of a connecting portion between the front abutting portion and the connecting portion is smaller than a cross-sectional area of other portions of the front abutting portion and the connecting portion excluding the connecting portion. Vehicle structure. The lower body structure of a vehicle according to claim 1,
A lower body structure for a vehicle, wherein each of the reinforcing members has a plate shape. The lower body structure of a vehicle according to claim 1,
The fuel tank is arranged so that the rear part of the fuel tank in the longitudinal direction of the vehicle overlaps the rear wheel when viewed along the vehicle width direction,
A lower vehicle body structure for a vehicle, wherein the protection member is disposed forward of the rear wheel. The lower body structure for a vehicle according to any one of claims 1 to 4,
A lower body structure for a vehicle, wherein the first direction is a vehicle width direction, and the second direction is a vehicle longitudinal direction. The lower body structure for a vehicle according to claim 5,
A lower body structure for a vehicle, comprising a pair of protection members provided on both sides of the fuel tank in the vehicle width direction. The lower body structure for a vehicle according to claim 5,
The vehicle body has a rear side frame extending in the vehicle longitudinal direction on the side of the fuel tank in the vehicle width direction,
A lower body structure for a vehicle, wherein the connecting portion located on the front side in the longitudinal direction of the vehicle is coupled to the rear side frame. The lower body structure for a vehicle according to claim 5,
The vehicle body includes a rear side frame extending along the vehicle longitudinal direction on the side of the fuel tank in the vehicle width direction, and a gusset frame connected to a rear portion of the rear side frame in the vehicle longitudinal direction,
A lower vehicle body structure for a vehicle, wherein the connecting portion located on the rear side in the longitudinal direction of the vehicle is coupled to the gusset frame.

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