JP7161142B2 - side member unit - Google Patents

Description

TECHNICAL FIELD The present invention relates to a side member unit, and more particularly to a technology for improving the bondability between a front side member and a floor side member.

A pair of left and right side member units extending in the front-rear direction of the vehicle are arranged in the lower part of the vehicle body of a general vehicle.
This side member unit includes a plurality of parts such as a front side member, a floor side member and a rear side member, and is integrally formed by welding these parts (Patent Document 1).

JP-A-9-24863

However, since the connecting portion connecting the front side member and the floor side member as in the above patent document is connected by welding, there is a risk of damage due to the impact of a vehicle collision or the like, and there is room for further improvement. rice field.
By the way, it is conceivable to increase the strength of the connecting portion by connecting the mating surfaces of the side members so that they are in contact with each other without gaps against the damage due to the impact caused by the collision of the vehicle or the like.

However, if the mating surfaces of the side members are brought into contact with each other without gaps, the paint may not reach the details inside the side members during electrodeposition coating in the production process.
SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to improve the rigidity of the connecting portion between the first side member and the second side member, which are part of the component parts of the side member unit. Another object of the present invention is to provide a side member unit capable of being rustproof.

In order to achieve the above object, the side member unit of the present invention comprises a first side member formed on the underside of the vehicle body of the vehicle and extending in the longitudinal direction of the vehicle; and a second side member extending in the longitudinal direction of the vehicle on the side member unit, wherein the side member unit is joined with the second side member overlapping the inside of the first side member. The second side member has a recess that is recessed inward in the left-right direction of the second side member in the side surface of the second side member. It is characterized in that it extends from the front end of the side member to the rear of the connecting portion.

As a result, the second side member of the side member unit is formed with a recess that is recessed toward the inside in the left-right direction of the second side member, and the recess extends from the front end of the second side member to the rear of the coupling portion in the vehicle front-rear direction. It is possible to increase the rigidity of the coupling portion in the side member unit by forming the joint portion in the same manner as the side member unit.
In addition, since a communication passage is formed between the first side member and the second side member, the electrodeposition coating used in the production process can reach even the details inside the side member unit, making it possible to improve rust prevention. be done.

As another aspect, the recess is formed on the vehicle vertical direction lower side of the side surface of the second side member and extends to the lower end of the second side member, and the first side member and the second side member It is preferable that at least the side surface be coupled at the upper side in the vehicle vertical direction.
As a result, even if water enters the inside of the side member unit when the vehicle runs through a puddle, for example, the communication passage of the recess formed to the lower end of the lower side of the second side member allows the side member unit to move. It is also possible to improve the drainage of water inside.

As another aspect, the parallel portion extends parallel to the vehicle front-rear direction from the front end of the second side member to the joint portion in the vehicle front-rear direction, and the parallel portion inclines outward in the vehicle left-right direction as it goes rearward in the vehicle front-rear direction from the joint portion. Preferably, it has an inclined portion.
As a result, for example, even if the coupling portion is subjected to an impact in the vehicle front-rear direction due to a frontal collision of the vehicle, the inclined portion is inclined outward in the vehicle left-right direction, so that the impact in the front-rear direction on the side member unit is reduced to a second degree. Since it can be received by the side member, it is possible to suppress the occurrence of stress concentration in the concave portion.

As another aspect, it is preferable that the first side member is formed with a bead extending in the vehicle front-rear direction and recessed downward in the vehicle up-down direction on the lower surface of the coupling portion.
As a result, the bead is formed at the lower end of the first side member corresponding to the connecting portion, thereby reinforcing the lower end of the first side member corresponding to the connecting portion without interfering with the second side member. is possible.

As another aspect, it is preferable that the bead is formed to extend forward in the vehicle front-rear direction from the coupling portion.
As a result, a bead is formed across the connecting portion of the first side member, that is, the front end portion of the second side member inside the first side member, so that the portion of the first side member to which impact is applied can be reinforced. is allowed.

Furthermore, even if water enters the inside of the side member unit, the drainage of the water inside the side member unit can be improved by the communication passage of the recess formed to the front end of the lower side of the second side member. is also possible.
As another aspect, it is preferable that a plurality of the beads are formed side by side in the left-right direction of the vehicle, and the first side member and the second side member are coupled at least at positions sandwiched between the plurality of beads. .

Thus, by fixing the first side member and the second side member at positions sandwiched between the plurality of beads, the rigidity of the lower end of the first side member in a twisting direction about the longitudinal direction of the vehicle can be increased. It is possible to suppress the application of a force to the fixing point such that the lower end of the first side member and the lower end of the second side member are separated from each other.
As another aspect, a plate-like member extending along the recess and the lower surface of the second side member from the rear of the recess of the second side member to the coupling portion in the vehicle front-rear direction is provided inside the second side member. of reinforcing members are preferably connected.

This makes it possible to favorably increase the rigidity of the connecting portion.
As another aspect, it is preferable that at least one point of the reinforcing member is coupled to the first side member via the second side member at the coupling portion.
As a result, the force applied to the first side member is transmitted to the reinforcing member via the second side member, so that the rigidity of the connecting portion can be improved.

According to the side member unit of the present invention, the second side member of the side member unit is formed with a recess that is recessed inward in the left-right direction of the second side member. Further, the concave portion is formed so as to extend outward in the vehicle front-rear direction from the joint portion side end portion of the second side member as viewed in the vehicle front-rear direction. Since the communication path is formed between the second side member and the second side member, the electrodeposition coating in the production process can reach the details inside the side member unit, and the rust resistance can be improved.

Thereby, it is possible to provide the rigidity and rust resistance of the connecting portion between the first side member and the second side member.

Fig. 2 is a perspective view of the vehicle body viewed obliquely from the front right of the vehicle; FIG. 3 is a perspective view of the side member unit as seen obliquely from the front right of the vehicle; FIG. 4 is an exploded perspective view of the side member unit viewed obliquely from the front right of the vehicle; FIG. 3 is a cross-sectional view taken along the line I-I in FIG. 2;

An embodiment of the present invention will be described below with reference to the drawings.
Referring to FIG. 1, a perspective view of a vehicle body 3 viewed obliquely from the front right of the vehicle is shown.
A vehicle body 3 forming a skeleton of the vehicle 1 is a so-called monocoque body including a floor panel 11 , a dash panel 13 and side member units 15 . The floor panel 11 is a panel member extending in the longitudinal direction and the lateral direction of the vehicle, and frame members such as a pair of left and right side sills 21 are welded to the left and right ends thereof. A column member such as a center pillar 23 extending in the vertical direction of the vehicle is welded to the side sill 21 .

The dash panel 13 is a panel member welded to the front end of the floor panel 11 in the longitudinal direction of the vehicle, and is formed to extend upward in the vertical direction of the vehicle from the floor panel 11 to form the rear surface of the engine room (not shown). . Frame members such as front pillars 25 are welded to left and right ends of the dash panel 13, for example. Although not shown, the front pillar 25 further extends upward to constitute a column member.

Therefore, by providing frame members such as the floor panel 11, the center pillar 23 and the front pillar 25 on the upper side of the floor panel 11, it is possible to arrange windows, doors, etc. (not shown). In this manner, a compartment is formed on the upper side of the floor panel 11 so as to be separated from the engine room and the outside of the vehicle 1 by arranging the dash panel 13, windows, doors, and the like.

2 shows a perspective view of the side member unit 15 as seen obliquely from the front right of the vehicle, and FIG. 3 shows an exploded perspective view of the side member unit 15 in FIG. Also, referring to FIG. 4, a sectional view of section II in FIG. 2 is shown.
The side member units 15 are a pair of left and right frame members arranged on both sides in the vehicle left-right direction below the floor panel 11 and formed to extend in the vehicle front-rear direction. The side member unit 15 has a front side member (first side member) 31 and a floor side member (second side member) 33 . Hereinafter, the right side member unit 15 in the left-right direction of the vehicle will be described, but the left side member has the same configuration, and the description thereof will be omitted here.

The front side member 31 is a frame member whose front end is attached to a front cross member (not shown) located on the front side of the vehicle and whose rear end is connected to the front end of the floor side member 33 . The front side member 31 is shaped like a hat when viewed in cross section. Specifically, a lower wall portion 41 forming the lower end of the front side member 31, a right wall portion 43 extending upward from the right end of the lower wall portion 41, and a left wall portion extending upward from the left end of the lower wall portion 41. The welding surface 47 is formed on the left outer wall portion 45 and the upper ends of the right outer wall portion 43 and the left outer wall portion 45 .

The rear end of the floor side member 33 is attached to a rear side member (not shown) positioned on the rear side of the vehicle, and the front end of the floor side member 33 extends forward from the rear end of the front side member 31 to a position separated by a first distance and overlaps the front side member 31 . It is a skeletal member that connects together. A portion where the front side member 31 and the floor side member 33 overlap is hereinafter referred to as a coupling portion 32 . Like the front side member 31, the floor side member 33 is shaped like a hat when viewed in cross section.

Specifically, a lower inner wall portion 51 forming the lower end of the floor side member 33, a right inner wall portion (side surface) 53 extending upward from the right end portion of the lower inner wall portion 51, and an upper wall portion extending upward from the left end portion of the lower inner wall portion 51. It is formed with a left inner wall portion (side surface) 55 extending toward it and a welding surface 57 formed on the upper ends of the right inner wall portion 53 and the left inner wall portion 55 . In the floor side member 33, the lower inner wall portion 51 contacts the upper surface of the lower outer wall portion 41, the right inner wall portion 53 contacts the left surface of the right outer wall portion 43, and the left inner wall portion 55 contacts the right surface of the left outer wall portion 45. positioned to abut.

Here, a first position defining hole 61 and a bead 63 are formed in the front side member 31 . The first position regulating hole 61 is a circular hole provided in the lower wall portion 41. In the process of welding the welding surface 47 of the front side member 31 to the lower surface of the floor panel 11, for example, by inserting a jig, the floor is positioned. These are so-called location holes for defining the relative positional relationship between the panel 11 and the front side member 31 .

The bead 63 is formed by denting the lower outer wall portion 41 downward, and two beads 63 are formed side by side on the left and right. The bead 63 extends from the rear of the first position defining hole 61 of the lower wall portion 41 toward the rear end of the lower wall portion 41 and is open. That is, the bead 63 is formed from the front end of the coupling portion 32 to the rear end. Thereby, the bead 63 can increase the rigidity of the lower wall portion 41 of the front side member 31 . In particular, since the bead 63 is formed to extend in the vehicle front-rear direction, it is possible to increase the rigidity in a direction in which the lower wall portion 41 is twisted around the vehicle front-rear direction.

A second position defining hole 71 and an inner recess (recess) 73 are formed in the floor side member 33 . The second position regulating hole 71 is a circular hole provided in the lower inner wall portion 51 , and in the process of welding the welding surface 57 of the floor side member 33 to the lower surface of the floor panel 11 , the floor is positioned by inserting, for example, a jig. These are so-called location holes for defining the relative positional relationship between the panel 11 and the floor side member 33 .

The inner recessed portion 73 is a recessed portion having a side surface 75 and an upper surface 77 and is formed to extend to the lower end of the floor side member 33 below the right inner wall portion 53 and the left inner wall portion 55 of the floor side member 33 in the vehicle front-rear direction. there is The inner recess 73 is also formed in the left inner wall portion 55 of the floor side member 33, and the description of the inner recess 73 formed in the left inner wall portion 55 is omitted.

The side surface 75 has a parallel portion 75a and an inclined portion 75b. The parallel portion 75a is formed to extend in parallel from the rear side of the position corresponding to the rear end of the front side member 31 toward the front end of the floor side member 33 while being separated from the right outer wall portion 43 by a second distance. The inclined portion 75b is formed so as to extend from the rear end of the parallel portion 75a so as to approach the right outer wall portion 43 as it goes rearward.

The upper surface 77 is located at the upper ends of the parallel portion 75a and the inclined portion 75b, constitutes the upper surface of the inner concave portion 73, and is parallel to the lower inner wall portion 51 at a position separated from the lower inner wall portion 51 by a third distance. formed to extend.
That is, the inner recessed portion 73 is formed in the front-rear direction so as to include positions corresponding to the front end and the rear end of the coupling portion 32 . Thereby, the rigidity of the coupling portion 32 can be increased. In addition, since the inner recessed portion 73 has a parallel portion 75a extending in parallel with the right outer wall portion 43 and an upper surface 77 extending in parallel with the lower inner wall portion 51, the right inner wall portion 53 and the lower inner wall of the floor side member 33 are aligned. The rigidity of the front end portion of the portion 51 can be increased.

Further, since the inner concave portion 73 is formed with the inclined portion 75b, even if the coupling portion 32 is subjected to an impact in the longitudinal direction of the vehicle due to, for example, a frontal collision of the vehicle 1, the inclined portion 75b will not move to the left and right of the vehicle. Since the side member unit 15 is inclined outward, the front side member 31 receives the impact in the front-rear direction of the side member unit 15 , thereby suppressing stress concentration from occurring in the inner recess 73 .

In particular, the bead 63 and the inner recess 73 are positioned to overlap at the joint 32 . Thereby, the rigidity of the connecting portion 32 of the front side member 31 and the floor side member 33 can be further increased.
A reinforcing member 80 is attached to the floor side member 33 . The reinforcing member 80 is a flat plate member having a bottom end wall 81 facing in the vertical direction, a right end wall 82 extending upward from the right end of the bottom end wall 81 , and a left end wall 83 extending upward from the left end of the bottom end wall 81 . Further, the reinforcing member 80 is provided with a third position defining hole 84 in the lower end wall 81 . Further, the reinforcing member 80 has a lower protrusion 85 on the lower end wall 81, a right protrusion 86 on the right end wall 82, and a left protrusion 87 on the left end wall 83, respectively.

The third position defining hole 84 is a round hole provided in the lower end wall 81 and is a so-called location hole for defining the relative positional relationship between the front side member 31 and the third position defining hole 84 .
The lower protrusions 85 are formed on the front and rear ends of the lower end wall 81 so as to be recessed downward by a fourth distance so as to have a semicircular shape when viewed from above. The lower convex portion 85 has a contact surface at its lower end that comes into surface contact with the upper surface of the lower inner wall portion 51 of the floor side member 33 .

The right convex portion 86 is formed at the vehicle front-rear direction center and rear end portion of the right end wall 82 so as to protrude rightward by a fourth distance (cross-sectional outer direction). The right convex portion 86 has a contact surface at the right end that comes into surface contact with the left surface of the right inner wall portion 53 of the floor side member 33 . Like the right convex portion 86 , the left convex portion 87 is formed at the vehicle front-rear direction center and rear end portion of the left end wall 83 so as to protrude leftward by a fourth distance, and is in surface contact with the right surface of the left inner wall portion 55 . It has a contact surface that

By the way, between the floor side member 33 and the lower surface of the lower inner wall portion 51, the above-described bead 63 recesses the lower outer wall portion 41 downward, extends toward the rear end of the lower outer wall portion 41, and opens. Therefore, the first communication path 63a is formed. Between the lower outer wall portion 41 and the right outer wall portion 43 and the inner concave portion 73, the parallel portion 75a of the side surface 75 is separated from the right outer wall portion 43 by a second distance, and the upper surface 77 is separated from the lower outer wall portion 41 by a second distance. Since they are separated by three distances, a second communication path 73a is formed. Furthermore, between the reinforcing member 80 and the floor side member 33, the lower convex portion 85, the right convex portion 86 and the left convex portion 87 are formed by being recessed by the fourth distance, so that the third communication path 80a is formed. formed.

That is, the front end of the bead 63 opens to the inside of the side member unit 15, and the rear end of the first communication passage 63a opens to the outside of the vehicle. is opened to the inside of the side member unit 15, and the rear side is opened to the outside of the vehicle. By opening the second position defining holes 71 to the outside of the vehicle, the inside and the outside of the front side member 31 and the floor side member 33 are communicated so as to be able to drain water.

Therefore, for example, even if the vehicle 1 runs through a puddle and water picked up by wheels (not shown) enters the side member unit 15 through the first position defining hole 61 or the second position defining hole 71. , the first communication path 63 a , the second communication path 73 a and the third communication path 80 a can discharge water from the inside of the side member unit 15 . As a result, it is possible to prevent the floor panel 11 and the side member unit 15 from rusting due to water staying inside the side member unit 15 for a long time and humidity becoming high.

2 and 4, the front side member 31, the floor side member 33 and the reinforcing member 80 are fixed by spot welding appropriately so as to include the first welding point wp1 to the tenth welding portion wp10. Specifically, the reinforcing member 80 includes a front end and a right projection 86 of the right end wall 82 and a right inner wall portion 53, a front end and a left projection 87 of the left end wall 83 and a left inner wall portion 55, and a lower projection 85 on the rear side in the vehicle front-rear direction. and the lower inner wall portion 51 are welded (wp1 to wp4 in FIG. 2).

The front side member 31 includes the rear end of the lower outer wall portion 41, the lower inner wall portion 51, the lower convex portion 85 on the front side in the vehicle front-rear direction, the right outer wall portion 43 and the right inner wall portion 53, the left outer wall portion 45 and the left inner wall portion 55. The fifth welding point wp5, the sixth welding point wp6 and the seventh welding point wp7 in FIG. It is a position sandwiched between.

As a result, the front side member 31, the floor side member 33, and the reinforcing member 80 can be attached by welding without blocking the first communication path 63a, the second communication path 73a, and the third communication path 80a. Further, the front side member 31, the floor side member 33, and the reinforcing member 80 are provided with a fifth welding point wp5, a sixth welding point wp6, and a seventh welding point wp7 at positions sandwiched between the beads 63 arranged in the lateral direction of the vehicle. Thus, the welding points are provided in positions of the lower wall portion 41 where the rigidity is increased by the beads 63 and the bending of the lower wall portion 41 is difficult to occur, and stress concentration at the welding points can be suppressed. .

Here, in the production process, after the front side member 31, the floor side member 33 and the reinforcing member 80 are welded in this manner, the welding surfaces 47 and 57 are welded to the floor panel 11 and the like to attach the side members to the vehicle body 3. Attach the member unit 15 .
After that, in the production process, after attaching members such as the side member unit 15 and other frame members that constitute the vehicle body 3 to the vehicle body 3, the vehicle body 3 is put into a paint tank in which paint is stored, and the inside of the vehicle body 3 is filled with paint. So-called electrodeposition coating is performed by sufficiently adhering the rust-preventive paint until it is energized. At this time, since the first communication path 63a, the second communication path 73a, and the third communication path 80a are provided, the paint can penetrate even the details inside the side member unit 15. As shown in FIG.

As described above, in the side member unit according to the present invention, the front side member 31 is formed on the lower side of the vehicle body 3 of the vehicle 1 and extends in the longitudinal direction of the vehicle. The side member unit 15 includes a floor side member 33 extending in the longitudinal direction of the vehicle on the side of the side member unit 15. The side member unit 15 has a connecting portion where the floor side member 33 overlaps and is connected to the inside of the front side member 31. 32, and the floor side member 33 has an inner recess 73 formed in the right inner wall portion 53 and the left inner wall portion 55 of the floor side member 33 and recessed inward in the left-right direction of the floor side member 33. The inner recess 73 It is characterized by being formed so as to extend from the front end of the floor side member 33 to the rear of the coupling portion 32 in the longitudinal direction of the vehicle.

Therefore, the floor side member 33 of the side member unit 15 is formed with an inner recess 73 that is recessed toward the inside in the left-right direction of the floor side member 33, and the inner recess 73 extends from the front end of the floor side member 33 in the vehicle front-rear direction to the connecting portion. The rigidity of the connecting portion 32 in the side member unit 15 can be increased by being formed to extend rearward from 32 .
Further, since the second communication passage 73a is formed between the front side member 31 and the floor side member 33, the electrodeposition coating in the production process reaches the details inside the side member unit 15, thereby enhancing the rust prevention property. be able to.

The inner recessed portion 73 is formed below the right inner wall portion 53 and the left inner wall portion 55 of the floor side member 33 in the vertical direction of the vehicle and extends to the lower inner wall portion 51 of the floor side member 33. The side member 33 is joined to at least the upper side of the right inner wall portion 53 and the left inner wall portion 55 in the vertical direction of the vehicle.
Therefore, even if water enters the side member unit 15 when the vehicle 1 runs through a puddle, for example, the inner recess 73 formed up to the lower inner wall portion 51 on the lower side of the floor side member 33 is The communication path can also improve the drainage of water inside the side member unit 15 .

A parallel portion 75a extending in the vehicle longitudinal direction from the front end of the floor side member 33 to the coupling portion 32 in parallel with the vehicle longitudinal direction, and an inclined portion 75b inclined outward in the vehicle lateral direction from the coupling portion 32 toward the rear in the vehicle longitudinal direction. and have
Therefore, even if the vehicle 1 collides frontally and the coupling portion 32 is subjected to an impact in the vehicle front-rear direction, the inclined portion 75b is inclined outward in the vehicle left-right direction. can be received by the floor side member 33 , stress concentration can be suppressed from occurring in the inner recess 73 .

In the front side member 31 , a bead 63 is formed on the lower surface of the connecting portion 32 so as to extend in the vehicle front-rear direction and recessed downward in the vehicle up-down direction.
Therefore, by forming the bead 63 on the lower inner wall portion 51 at the position corresponding to the connecting portion 32 of the front side member 31, the position corresponding to the connecting portion 32 of the front side member 31 can be achieved without interfering with the floor side member 33. The lower inner wall portion 51 of can be reinforced.

Further, since the bead 63 is formed to extend forward in the vehicle front-rear direction from the connecting portion 32, the bead 63 is formed across the front end portion of the floor side member 33 inside the front side member 31, so that impact is reduced. The part of the front side member 31 that joins can be reinforced.
Furthermore, even if water enters the inside of the side member unit 15, the inside of the side member unit 15 is prevented by the first communication passage 63a of the bead 63 formed to the front end of the lower inner wall portion 51 of the floor side member 33. It is also possible to further improve the drainage of water in the

Two beads 63 are formed side by side in the left-right direction of the vehicle, and the front side member 31 and the floor side member 33 are joined at positions sandwiched between the beads 63 to form the lower outer wall of the front side member 31 . The rigidity of the portion 41 is increased in the direction of twisting about the longitudinal direction of the vehicle, and a force such that the lower wall portion 41 of the front side member 31 and the lower inner wall portion 51 of the floor side member 33 are separated from each other is generated at the welding points wp5 to wp5. 7 can be suppressed.

Inside the floor side member 33, a plate-like reinforcing member 80 extending along the inner concave portion 73 of the floor side member 33 and the lower surface from the rear side of the inner concave portion 73 of the floor side member 33 to the coupling portion 32 in the longitudinal direction of the vehicle. are coupled, the rigidity of the coupling portion 32 can be favorably increased.
At least one point of the reinforcing member 80 is connected to the front side member 31 via the floor side member 33 at the connecting portion 32 , so that the force applied to the front side member 31 is transferred to the reinforcing member via the floor side member 33 . 80, the rigidity of the connecting portion 32 can be improved.

Although the description of the side member unit according to the present invention is finished above, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the invention.
For example, in the present embodiment, the connection between the front side member 31 and the floor side member 33 has been described, but it may be applied to the connection between the floor side member 33 and a rear side member (not shown).

Further, in the present embodiment, the inner recesses 73 are formed in the right inner wall portion 53 and the left inner wall portion 55 so as to extend to the lower inner wall portion 51, but a bead-shaped recess is formed in the right inner wall portion 53 or the left inner wall portion 55. Alternatively, it may not be formed to extend to the lower inner wall portion 51 .
In addition, although the welding points wp1 to wp10 have been described in the present embodiment, their positions may be changed as appropriate.

1 vehicle 3 vehicle body 15 side member unit 31 front side member (first side member)
32 Joining portion 33 Floor side member (second side member)
53 right inner wall (side)
55 left inner wall (side)
63 bead 73 inner recess (recess)
75 side surface 77 upper surface 80 reinforcing member

Claims (8)

a first side member formed to extend in the longitudinal direction of the vehicle under the vehicle body;
a second side member coupled to the rear portion of the first side member and formed on the lower side of the vehicle body and extending in the vehicle front-rear direction,
The side member unit has a coupling portion where the second side member overlaps and is coupled to the inside of the first side member,
the second side member is formed with a recess that is recessed inward in the left-right direction of the second side member in a side surface of the second side member;
The recess is a side member unit formed by extending from the front end of the second side member to the rear of the connecting portion in the vehicle front-rear direction. The recessed portion is formed on the vehicle vertical direction lower side of the side surface of the second side member and extends to the lower end of the second side member, and the first side member and the second side member are arranged at least on the side surface of the vehicle. 2. The side member unit according to claim 1, which is joined on the upper side in the vertical direction. The concave portion has a parallel portion extending in the vehicle front-rear direction from the front end of the second side member to the coupling portion in parallel with the vehicle front-rear direction, and an inclined portion that inclines outward in the vehicle left-right direction from the coupling portion toward the rear in the vehicle front-rear direction. 3. The side member unit according to claim 1 or 2, comprising: The side member unit according to any one of claims 1 to 3, wherein the first side member is formed with a bead extending in the vehicle front-rear direction and recessed downward in the vehicle up-down direction on the lower surface of the connecting portion. 5. The side member unit according to claim 4, wherein said bead extends forward in the vehicle front-rear direction from said coupling portion. 6. The bead according to claim 4 or 5, wherein a plurality of said beads are arranged side by side in the left-right direction of the vehicle, and said first side member and said second side member are coupled at least at positions sandwiched between said plurality of beads. side member unit. A plate-like reinforcing member is coupled to the inner side of the second side member and extends along the recess and the lower surface of the second side member from behind the recess of the second side member to the coupling portion in the vehicle front-rear direction. The side member unit according to any one of claims 2 to 6, wherein the side member unit is 8. The side member unit according to claim 7, wherein at least one point of said reinforcing member is coupled to said first side member via said second side member at said coupling portion.

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