Vehicle lower structure

Abstract

To provide a vehicle lower structure which can prevent damage of a member to be stored (a stored member) stored in an internal space of a frame member.SOLUTION: A vehicle lower structure includes: a first frame member 7 in which a first space 70 is formed; a second frame member 5 in which a second space 50a is formed and which is joined to the first frame member 7 by welding; and a stored member 20 which is stored in an area ranging from the first space 70 and the second space 50a and formed of an electric wiring or a pipeline. A welding part 8 is formed over a side wall 71 of the first frame member 7 and an opening edge 50 of the second frame member 5 facing the side wall 71. The side wall 71 has an extension part 73 which extends toward the second space 50a so as to cover the stored member 20 in a state where the stored member 20 is inserted into a through hole 72 formed at the side wall 71.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a vehicle undercarriage. [Background technology]

[0002] A vehicle equipped with a motor as a power source is also equipped with a battery for driving the motor. The battery is located on the floor where the occupants' feet are. Therefore, in the event of a vehicle collision, a vehicle undercarriage structure is known that absorbs impacts applied to the vehicle and protects the battery to prevent electric shock or fire caused by electrical leakage due to damage to the battery (see, for example, Patent Document 1).

[0003] The vehicle underbody structure described in Patent Document 1 has an energy absorbing member disposed within a side sill, and a floor cross member and the like connected to the side sill in the vehicle width direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-56569 Summary of the Invention [Problem to be solved by the invention]

[0005] The frame members described in Patent Document 1, such as the side sills and floor cross members, have internal spaces that are left unused, resulting in ineffective use of vehicle space. As a result, battery capacity is limited, so it would be effective to house pipes, electrical wiring, and the like inside the frame members to the extent that it does not affect the vehicle's impact absorption function. However, when joining a pair of frame members by welding, gases and the like generated during welding can cause sparks to fly, potentially damaging the pipes, electrical wiring, and the like.

[0006] Therefore, there is a demand for a vehicle underbody structure that can prevent damage to piping, electrical wiring, etc. housed in the internal space of the frame members. [Means for solving the problem]

[0007] The characteristic configuration of the vehicle undercarriage structure of the present invention is that it comprises a first frame member having a first space formed therein, a second frame member having a second space formed therein and joined to the first frame member by welding, and a held member consisting of electrical wiring or piping housed across the first space and the second space, wherein a weld is formed across the side wall of the first frame member and the opening edge of the second frame member facing the side wall, and the side wall has an extension portion extending toward the second space so as to cover the held member when the held member is inserted into a through hole formed in the side wall.

[0008] In this configuration, by accommodating a accommodated member consisting of electrical wiring or piping across the first space of the first frame member and the second space of the second frame member, it is possible to effectively utilize the vehicle space. In this case, because a weld is formed across the side wall of the first frame member and the edge of the opening in the second frame member facing the side wall, there is a risk that sparks will fly due to gases, etc., generated during welding, and that the piping, electrical wiring, etc. will be damaged.

[0009] Therefore, in this configuration, the side wall has an extension portion that extends toward the second space so as to cover the held member, so that even if sparks fly from the welded portion toward the second space on the opening side, the extension portion can prevent the sparks from coming into contact with the held member.

[0010] Therefore, the vehicle undercarriage structure can prevent damage to the piping, electrical wiring, etc. housed in the internal space of the frame member. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view showing the arrangement of the battery unit in the vehicle. [Figure 2] FIG. 2 is a vertical cross-sectional view of the vehicle undercarriage. [Figure 3]4 is an explanatory diagram showing a joint between a first frame member and a second frame member. FIG. [Figure 4] 3 is a vertical cross-sectional view of the vicinity of a joint surface between a first frame member and a second frame member according to the first embodiment. FIG. [Figure 5] FIG. 10 is a vertical cross-sectional view of the vicinity of a joint surface between a first frame member and a second frame member according to a second embodiment. [Figure 6] FIG. 10 is a vertical cross-sectional view of the vicinity of a joint surface between a first frame member and a second frame member according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of a vehicle underbody structure according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0013] First Embodiment As shown in FIG. 1 , the vehicle undercarriage 1 forms, for example, a battery unit for a vehicle mounted at the center of the vehicle C in the vehicle width direction and below the floor between the front and rear wheels. The vehicle C is an automobile equipped with a rotary electric motor M (one example of a drive source) such as a motor as a drive source for traveling, and examples thereof include a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), and a fuel cell electric vehicle (FCEV). The vehicle C includes the rotary electric motor M that is driven by power supplied from the battery unit, and wheels T to which power from the rotary electric motor M is transmitted via a reduction mechanism (not shown) or the like. The vehicle C travels when power is supplied to the rotary electric motor M, causing the wheels T to rotate.

[0014] 1 and 2, the vehicle lower structure 1 (battery unit) is configured to include a battery module assembly 2, an upper cover 3, a floor cross member 4, a first frame member 7, a second frame member 5, and a lower case 6. In the following, the vehicle width direction of the vehicle C is defined as the X direction, the vehicle length direction as the Y direction, and the vehicle height direction (vertical direction) as the Z direction.

[0015] The battery module ASSY2 is configured with a plurality of battery modules arranged in parallel along the X direction with a plurality of battery cells connected in series and electrically connected along the Y direction. The battery module ASSY2 is a rechargeable battery (secondary battery) such as a nickel-metal hydride battery or a lithium-ion battery. The battery module ASSY2 is housed in a space surrounded by the upper cover 3, first frame member 7, second frame member 5, and lower case 6 in a plan view (viewed in the Z direction).

[0016] The upper cover 3 is made of a metal such as iron or aluminum, and is disposed above the battery module assembly 2 in a plan view. The upper cover 3 has a pair of protrusions that protrude upward in the Z direction from ends in the X direction. The protrusions are connected to a second frame member 5, which will be described later.

[0017] On the upper surface of the upper cover 3, multiple (two in this embodiment) floor cross members 4 are arranged between a pair of protrusions so as to be in contact with the upper cover 3. The floor cross members 4 are hollow, rectangular tubular members extending in the X direction, and are made of metal such as iron or aluminum. The hollow portion of the floor cross member 4 may be divided into multiple sections. The length of the floor cross member 4 in the X direction is approximately the same as the length of the upper cover 3 in the X direction. The floor cross member 4 is adjacent to the second frame member 5 so as to face each other via the protrusions of the upper cover 3.

[0018] The lower case 6 is made of a metal such as iron or aluminum, and is disposed below the battery module ASSY 2 in a plan view. A heat sink or the like may be disposed on the upper surface of the lower case 6. An under cover (not shown) or the like may be disposed below the lower case 6. The lower case 6 is connected to a second frame member 5 (described later) via fastening members 12.

[0019] Second frame members 5 are disposed on the sides of the battery module ASSY2 as viewed in the Y direction, i.e., on the right and left sides of the vehicle C. The second frame members 5 are hollow, rectangular tubular members made of metal such as iron or aluminum, and absorb the component of external force acting in the X direction by collapsing the hollow portion. In other words, the second frame members 5 act as shock absorbers that absorb external impacts, etc. The second frame members 5 are connected to a rocker (not shown) disposed above the second frame member 5 and a chassis (not shown) disposed outside in the X direction by fastening mechanisms (not shown).

[0020] The hollow portion of the second frame member 5 is divided into four sections by a dividing member 63 extending along the X direction and a dividing member 64 extending along the Z direction. As a result, the second frame member 5 has therein a space 50a (an example of a second space), a space 50b, a space 50c, and a space 50d. The spaces 50a and 50c are disposed on the battery module assembly 2 side of the second frame member 5, and the spaces 50b and 50d are disposed on the vehicle exterior side of the second frame member 5. The spaces 50a and 50b are disposed on the lower case 6 side of the second frame member 5, and the spaces 50c and 50d are disposed on the upper cover 3 side of the second frame member 5. In the following description, the portion of the second frame member 5 including the spaces 50c and 50d will be referred to as an upper impact absorbing portion 51, and the portion of the second frame member 5 including the spaces 50a and 50b will be referred to as a lower impact absorbing portion 52.

[0021] The upper impact absorbing portion 51 is disposed opposite the floor cross member 4 in the X direction and is connected to a protruding portion of the upper cover 3. The Z direction dimension of the upper impact absorbing portion 51 is substantially the same as the Z direction dimension of the protruding portion of the upper cover 3 and the Z direction dimension of the floor cross member 4. Therefore, an external force F (indicated by an arrow in FIG. 2) applied from the side of the vehicle C is absorbed by the second frame member 5 and then transmitted to the floor cross member 4 via the upper cover 3. This makes it possible to prevent the external force F from being transmitted to the battery module ASSY 2.

[0022] The lower impact absorbing portion 52 is connected to the upper impact absorbing portion 51 and has a surface (YZ plane) facing the battery module ASSY 2 in the X direction. The lower impact absorbing portion 52 is disposed at a position spaced a predetermined distance from the battery module ASSY 2 in the X direction and is connected to the lower case 6 by fastening members 12. The predetermined distance is a distance greater than the dimension by which the lower impact absorbing portion 52 is displaced toward the vehicle interior when a predetermined external force is applied to the second frame member 5. The predetermined external force may be adjusted according to an external force expected in the event of a collision of the vehicle C. As a result, even if an external force F is applied from the side of the vehicle C, causing the lower impact absorbing portion 52 to deform and displace toward the battery module ASSY 2, the lower impact absorbing portion 52 and the battery module ASSY 2 do not come into contact with each other, and therefore, transmission of the external force F to the battery module ASSY 2 can be suppressed.

[0023] In the upper impact absorbing portion 51, the Z-direction dimension of the space 50c and the Z-direction dimension of the space 50d are configured to be approximately the same. On the other hand, in the lower impact absorbing portion 52, the Z-direction dimension of the space 50a is configured to be larger than the Z-direction dimension of the space 50b. In other words, the lower end of the vehicle-exterior side surface of the second frame member 5 is cut out toward the battery module ASSY2.

[0024] When an external force F along the X direction is applied to the vehicle C, the external force F is transmitted from the vehicle-exterior side surface of the second frame member 5 to the floor cross member 4. At this time, because the second frame member 5 has the above-described configuration, the spaces 50b, 50c, and 50d of the second frame member 5 are deformed so as to collapse, and the external force F is absorbed. On the other hand, the external force F is not easily transmitted to the portion of the lower impact absorbing section 52 that forms the space 50a, and therefore the space 50a is not easily collapsed. Therefore, in this embodiment, the vehicle space is effectively utilized by accommodating the accommodated member 20 in the space 50a.

[0025] The held member 20 is made up of piping such as electrical wiring 23, coolant piping 22, and hydraulic piping 24. The coolant piping 22 is a piping that supplies coolant that cools a power conversion module 26 (an example of a heating element) that includes a rotary electric motor M and an inverter that drives the rotary electric motor M. The electrical wiring 23 is a wiring that supplies power to a rotary electric motor (not shown) at the front of the vehicle C when power stored in the battery is taken from the rear of the vehicle C, or that supplies power to a rotary electric motor M (see FIG. 1) at the rear of the vehicle C when power stored in the battery is taken from the front of the vehicle C. The hydraulic piping 24 is a piping that supplies brake oil to a reduction mechanism that decelerates the wheels T, which are the rear wheels of the vehicle C.

[0026] The outer periphery of these held members 20 is covered with resin or the like. If the resin or the like is damaged by heat, for example, insulation may not be ensured, causing a short circuit in the electrical wiring 23, or the temperature of the coolant may fluctuate, resulting in a decrease in thermal efficiency. In particular, when the held members 20 are housed in the space 70 of the first frame member 7 and the space 50a of the second frame member 5 (described later) and then joined by welding, sparks caused by gas or the like may fly into the space 50a and easily adhere to the held members 20. Therefore, to protect the held members 20 from such sparks, the first frame member 7 is provided with an extension portion 73.

[0027] First, the first frame member 7 will be described with reference to Figures 1, 3, and 4. Both ends of the second frame member 5 in the Y direction are openings. In order to prevent water and the like from entering the spaces 50a, 50b, 50c, and 50d of the second frame member 5 through these openings, first frame members 7 are joined to the openings of the second frame member 5 to close the openings (see Figure 3). The first frame members 7 are arranged in a similar configuration at both ends of the second frame member 5 in the Y direction, but in this embodiment, description of the first frame member 7 arranged in the front of the vehicle C will be omitted and only the first frame member 7 arranged in the rear of the vehicle C will be described.

[0028] The first frame member 7 is a rectangular parallelepiped member having a space 70 (an example of a first space) formed therein. The first frame member 7 may be formed of a metal such as iron or aluminum. As shown in FIG. 1 , the X-direction dimension of the first frame member 7 is approximately the same as the sum of the X-direction dimension of the upper cover 3 and the X-direction dimension of the second frame members 5 disposed on both sides of the upper cover 3. The X-direction side surface of the first frame member 7 (the vehicle exterior side surface) and the X-direction side surface of the second frame member 5 are disposed so as to be flush with each other. Note that in this embodiment, the lower end of the vehicle exterior side surface of the first frame member 7 is cut out, similar to the second frame member 5. The Z-direction dimension of the first frame member 7 is approximately the same as the Z-direction dimension of the second frame member 5. The Z-direction side surface of the first frame member 7 and the Z-direction side surface of the second frame member 5 are disposed so as to be flush with each other.

[0029] As shown in FIG. 3 , a through hole 72 is formed in a side wall 71 of the first frame member 7 facing the opening edge 50 of the second frame member 5. The through hole 72 is provided to guide the held member 20 from the opening of the second frame member 5 into the space 70 when the second frame member 5 and the first frame member 7 are joined. Therefore, the position of the through hole 72 is preferably the same as the position of the held member 20 in the second frame member 5 in the X and Z directions. The held member 20 according to this embodiment is inserted through the space 50a of the second frame member 5 and the space 70 of the first frame member 7. The through hole 72 may have any shape, such as a circle, an ellipse, or a polygon. The through hole 72 preferably has an area equal to or greater than the cross-sectional area of ​​the held member 20.

[0030] As shown in FIGS. 3 and 4 , the side wall 71 of the first frame member 7 has an extension portion 73 extending from the outer edge of the through hole 72 toward the space 50a of the second frame member 5. The extension portion 73 may have a cylindrical shape, and may have a shape that matches the shape of the through hole 72. In this embodiment, the extension portion 73 is cylindrical and is composed of a cylindrical main body 74. In this embodiment, the cylindrical main body 74 extends along the Y direction, but the cylindrical main body 74 may extend so that its diameter increases or decreases toward the space 50a. As shown in FIG. 4 , the held member 20 is inserted into the cylindrical main body 74, passes through the through hole 72, and is held in the space 70. Therefore, a portion of the held member 20 is covered by the extension portion 73.

[0031] The extension portion 73 may be integrally formed with the first frame member 7, or they may be formed by extrusion molding. Alternatively, the extension portion 73 may be formed by burring or the like after forming the rectangular parallelepiped-shaped first frame member 7. Burring or the like reduces material costs and ensures the strength of the integral member. The Y-direction dimension of the extension portion 73 formed by burring or the like is approximately the same as the radius of the through hole 72 and is determined according to the size of the through hole 72. Therefore, the larger the radius of the through hole 72, the larger the Y-direction dimension of the extension portion 73 can be. However, the diameter of the through hole 72 cannot be greater than the area of ​​the side wall 71, and there is an upper limit to the radius of the through hole 72. If the Y-direction dimension of the extension portion 73 is too small, the held member 20 cannot be protected from sparks generated during welding. Therefore, the Y-direction dimension of the extension portion 73 is preferably 10 mm or greater.

[0032] The first frame member 7 has the extension portion 73, which prevents sparks generated by gas or the like from coming into contact with the held member 20 when the first frame member 7 and the second frame member 5 are welded together. In other words, the extension portion 73 protects the held member 20, preventing damage to the held member 20.

[0033] As described above, the first frame member 7 and the second frame member 5 are joined by welding. Therefore, a welded portion 8 is formed across the side wall 71 of the first frame member 7 and the opening edge 50 of the second frame member 5 facing the side wall 71.

[0034] The accommodated member 20 accommodated in the space 70 may extend from a hole provided in the center of the first frame member 7 in the X direction toward the power conversion module 26. A hole may be formed for each of the electrical wiring 23, the coolant pipe 22, and the hydraulic pipe 24, or may be formed so that all of these are passed through at once.

[0035] Next, a manufacturing method of the vehicle understructure 1 according to this embodiment will be described. First, the held member 20, i.e., the coolant pipe 22, the electrical wiring 23, or the hydraulic pipe 24, is inserted into the space 50a in the second frame member 5. At this time, these may be temporarily fixed. Thereafter, the tip of the held member 20 extending from the opening in the second frame member 5 is inserted into the extension portion 73 and the through-hole 72 of the first frame member 7, and the held member 20 is held in the space 70 (see FIG. 3). At this time, since the first frame member 7 has the extension portion 73, it is easy to position the held member 20, and movement of the held member 20 can be restricted.

[0036] Next, welding is performed with the side wall 71 of the first frame member 7 and the opening edge 50 of the second frame member 5 abutting against each other to form a weld 8 and join the first frame member 7 and the second frame member 5 (see FIG. 3 ). During welding, sparks due to gases generated during welding may fly onto the joining surfaces. Because the first frame member 7 has the side wall 71, sparks do not fly into the space 70. However, because the second frame member 5 has an opening, sparks are likely to fly toward the spaces 50a, 50b, 50c, and 50d, which are the internal spaces of the second frame member 5. Because the held member 20 is housed in the space 50a, contact between the held member 20 and sparks may damage the held member 20.

[0037] In this embodiment, the extended portion 73 extending from the side wall 71 of the first frame member 7 toward the space 50a covers the held member 20, and therefore the extended portion 73 prevents sparks from coming into contact with the held member 20. In other words, the held member 20 is protected by the extended portion 73. Therefore, the first frame member 7 and the second frame member 5 can be joined by welding without damaging the held member 20.

[0038] When forming the extension portion 73 on the side wall 71 by burring or the like, a processing jig may be inserted toward the side wall 71 from the side surface of the first frame member 7 that faces the side wall 71 across the space 70. In this case, a hole (not shown) for inserting the jig is provided in the side surface of the first frame member 7 that faces the side wall 71, but this hole may be filled with a separate member. Since the space 70 is sealed by filling the hole, it is possible to protect the held member 20 without allowing water or the like to enter the space 70.

[0039] In addition, the first frame member 7 may be joined to the second frame member 5 after the lower case 6 has been assembled to the second frame member 5, or may be joined to the second frame member 5 after the upper cover 3 and floor cross member 4 have been assembled to the second frame member 5.

[0040] Second Embodiment The vehicle undercarriage 1 according to the second embodiment will be described with reference to Fig. 5. Fig. 5 is a vertical cross-sectional view of the vicinity of the joint surface between the first frame member 7 and the second frame member 5. The extension portion 73 in this embodiment has an annular flange 75 that is bent outward from the end portion 74a of the cylindrical main body 74. The curvature of the annular flange 75 can be determined arbitrarily. The other configurations are the same as those in the first embodiment, so description thereof will be omitted.

[0041] The extending portion 73 has an annular flange 75, which makes it possible to prevent contact between the outer edge of the extending portion 73 and the held member 20 when the held member 20 is inserted into the extending portion 73. This makes it easier to insert the held member 20 into the extending portion 73, and also makes it possible to prevent damage to the held member 20 due to contact between the outer edge of the extending portion 73 and the held member 20. Furthermore, the annular flange 75 catches sparks generated during welding, preventing the scattering of sparks.

[0042] The extension portion 73 may have a flange portion that protrudes radially outward from the end portion 74a of the cylindrical main body 74. The outer edge of the flange portion or the annular flange 75 may be connected to the side surface of the second frame member 5 that forms the space 50a. This makes it possible to prevent sparks from flying into the space 50a.

[0043] In the above-described embodiment, the following configurations are envisioned. (1) The vehicle undercarriage structure 1 comprises a first frame member 7 having a first space (space 70) formed therein, a second frame member 5 having a second space (space 50a) formed therein and joined to the first frame member 7 by welding, and a held member 20 consisting of electrical wiring 23 or piping (coolant piping 22, hydraulic piping 24) housed across the first space (space 70) and the second space (space 50a), wherein a weld 8 is formed across a side wall 71 of the first frame member 7 and an opening edge 50 of the second frame member 5 facing the side wall 71, and the side wall 71 has an extension portion 73 extending toward the second space (space 50a) so as to cover the held member 20 when the held member 20 is inserted through a through hole 72 formed in the side wall 71.

[0044] As in this configuration, by accommodating the accommodated member 20 made up of electrical wiring 23 or piping (coolant piping 22, hydraulic piping 24) across the first space (space 70) of the first frame member 7 and the second space (space 50a) of the second frame member 5, it is possible to effectively utilize the vehicle space. At this time, because the welded portion 8 is formed across the side wall 71 of the first frame member 7 and the opening edge 50 of the second frame member 5 facing the side wall 71, there is a risk that sparks will fly due to gases and the like generated during welding, which may damage the piping (coolant piping 22, hydraulic piping 24), the electrical wiring 23, etc.

[0045] Therefore, in this configuration, the side wall 71 has an extending portion 73 that extends toward the second space (space 50a) so as to cover the held member 20, and therefore even if sparks fly from the welded portion 8 toward the second space (space 50a) on the opening side, the extending portion 73 can prevent the sparks from coming into contact with the held member 20. Therefore, the vehicle undercarriage structure 1 is capable of preventing damage to the piping (coolant piping 22, hydraulic piping 24), electrical wiring 23, etc. housed in the second space (space 50a) of the second frame member 5.

[0046] (2) In the vehicle underbody structure 1 of (1), it is preferable that the extension portion 73 extends integrally with the side wall 71 from the outer edge of the through-hole 72 into the second space (space 50a).

[0047] As in this configuration, when the extension portion 73 extends from the outer edge of the through hole 72 into the second space (space 50a) integrally with the side wall 71, there is no need to prepare a separate protective material, and the extension portion 73 can be created by burring or the like of the side wall 71. As a result, material costs can be reduced and strength as an integrated body can be obtained.

[0048] (3) In the vehicle undercarriage structure 1 of (1), it is preferable that the extension portion 73 is a member 76 separate from the first frame member 7 , and that the separate member 76 is fixed to the side wall 71 .

[0049] As in this configuration, if the extension portion 73 is a separate member 76 from the first frame member 7, the degree of freedom in the shape of the extension portion 73 increases, and it can be made into a shape that can prevent sparks from welding.

[0050] (4) In any one of the vehicle undercarriage structures 1 of (1) to (3), it is preferable that the extension portion 73 is composed of a cylindrical main body 74 and an annular flange 75 bent outward from the end portion 74a of the cylindrical main body 74.

[0051] If the cylindrical body 74 has an annular flange 75 bent outward from the end 74a as in this configuration, it is easy to insert electrical wiring 23, etc., and this annular flange 75 can catch sparks and prevent them from flying further.

[0052] Other Embodiments (a) In the above embodiment, the second frame member 5 has the space 50a, but the space 50a may be divided into two in the Z direction. The hollow space of the second frame member 5 may be divided as desired.

[0053] (b) In the above embodiment, the extension portion 73 is formed by burring. However, it is also possible to form a hole having a smaller diameter than the through hole 72 in the side wall 71 of the first frame member 7, and then insert a jig into the hole and pull the side wall 71 around the hole toward the space 50a to widen the hole, thereby forming the through hole 72 and the extension portion 73.

[0054] 6, the extending portion 73 may not be integrally formed with the first frame member 7, but may be formed from a separate member 76. When the extending portion 73 is formed from a separate member 76, the separate member 76 may be fixed to the side wall 71 by welding, adhesive, or the like. This makes it possible to arbitrarily determine the range over which the extending portion 73 covers the held member 20. The separate member 76 may be made of a different material from that of the first frame member 7. [Industrial Applicability]

[0055] The present invention can be used in a vehicle undercarriage. [Explanation of symbols]

[0056] 1: vehicle undercarriage, 5: second frame member, 7: first frame member, 8: welded portion, 20: held member, 22: coolant piping (piping), 23: electrical wiring, 24: hydraulic piping (piping), 50: opening edge, 50a: space (second space), 70: space (first space), 71: side wall, 72: through hole, 73: extension portion, 74: cylindrical main body, 74a: end portion, 75: annular flange

Claims

1. a first frame member having a first space formed therein; a second frame member having a second space formed therein and joined to the first frame member by welding; a contained member formed of an electric wiring or a pipe housed across the first space and the second space, a weld is formed between a side wall of the first frame member and an opening edge of the second frame member facing the side wall, A vehicle undercarriage structure, wherein the side wall has an extension portion that extends toward the second space so as to cover the held member when the held member is inserted into a through hole formed in the side wall.

2. The vehicle underbody structure according to claim 1 , wherein the extension portion extends integrally with the side wall from an outer edge of the through hole into the second space.

3. The vehicle underbody structure according to claim 1 , wherein the extension portion is a separate member from the first frame member, and the separate member is fixed to the side wall.

4. The vehicle undercarriage structure according to any one of claims 1 to 3, wherein the extension portion is composed of a cylindrical main body and an annular flange bent outward from the end of the cylindrical main body.

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