JP3702706B2 - Body structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body structure in which an engine room and a front compartment are formed by a skeleton.
[0002]
[Prior art]
FIG. 6 is a plan view of a chassis frame representing a conventional vehicle body structure, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
[0003]
In the conventional vehicle body structure, as shown in FIG. 6, the front side members 001 along the front-rear direction on the left and right side portions of the vehicle body have a closed cross-sectional shape, and the front end portions thereof are joined to the front bumper hose 002, respectively. On the other hand, the rear end portion of each front side member 001 is curved outward and joined to the front end portions of the left and right front side sills 003. The rear end of each front side sill 003 is joined to the rear bumper hose 004. The left and right front floor side members 005 are disposed inside the front side sill 003, the front end is joined to the rear end of the front side member 001, and the rear end is joined to the rear bumper hose 004 and the like.
[0004]
Therefore, the input load from the front bumper hose 002 to each front side member 001 due to a frontal collision is distributed and transmitted to the front side sill 003 and the front floor side member 005. By absorbing and supporting the input load, Prevents deformation of the guest rooms.
[0005]
[Problems to be solved by the invention]
In the conventional vehicle body structure described above, the rear end portion of the front side member 001 is joined to the front side sill 003 and the front floor side member 005, so that the input load is dispersed and absorbed, and each member is closed. By taking the cross-sectional shape, the load is sufficiently received. However, as shown in FIG. 7, an accelerator pedal 006 is disposed near the rear end portion of the front side member 001, and the closed cross-sectional portion is crushed so as to ensure the operating stroke, and the input load is reduced. I can't take it enough. Further, since the positions of the front side member 001 and the front floor side member 005 are arranged so as to be shifted in the vehicle width direction, the input load cannot be sufficiently received in this respect.
[0006]
In particular, since a large load acts on one side of the vehicle body during an offset collision, conventionally, measures such as increasing the thickness of the front side member 001 or adding a reinforcing member have been taken. This has led to an increase in the body weight.
[0007]
As a conventional vehicle body structure, there is one disclosed in JP-A-4-262974. The “car body structure of an automobile” disclosed in this publication includes a side panel having a closed cross-section composed of a vehicle body side member and a cabin side member, and a branch member that branches vertically in the cabin side member is formed. The end of the member is connected to the skeleton member assembly portion of the vehicle body, and the collision load acting on the side panel is distributed through the upper and lower branch members to be borne by the skeleton member assembly portion. However, in this "car body structure of an automobile", the rear end portion of the branch member branched up and down is simply joined to the skeleton member assembly portion, so the deformation prevention of the cabin depends on the strength of the skeleton member assembly portion itself. Therefore, measures such as an increase in the thickness of the skeleton member assembly portion and the addition of a reinforcing member are required, which leads to an increase in cost and an increase in the weight of the vehicle body as described above.
[0008]
The present invention solves such a problem, and the vehicle body structure is designed to improve safety by ensuring sufficient strength in the frame of the passenger compartment without increasing the cost or increasing the weight of the vehicle body. The purpose is to provide.
[0009]
[Means for Solving the Problems]
In the vehicle body structure of the present invention for achieving the above-described object, the rear end portion of the side member that is disposed along the front-rear direction on the side portion of the vehicle body and has a closed cross-sectional shape extends downward from the upper branching portion. While branching to the lower branch part, the upper branch part is joined to the pillar so as to face the end of the door impact bar provided on the door, and the hinge attachment part of the hinge connected to the door is provided at the joint part, The lower branch portion is joined to a side sill continuous with the pillar, and is joined in a straight line to the front end portion of the floor side member that supports the floor of the vehicle body.
[0010]
Therefore, the closed cross-section shape part continues from the upper branch part of the side member to the pillar and from the lower branch part to the side sill and the floor side member, so that sufficient strength is ensured and input to the side member by a collision in the front-rear direction. The load is distributed and transmitted from the upper branch part to the door impact bar via the pillar and from the lower branch part to the side sill and floor side member. Can be prevented from being deformed. Further, when this vehicle body structure is applied to the front portion of the vehicle body, the strength for receiving the input load does not decrease even if a space for the accelerator pedal is secured between the upper branch portion and the lower branch portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 shows an outline of a joining structure at a rear end portion of a front side member representing a vehicle body structure according to an embodiment of the present invention, FIG. 2 is a plan view of a chassis frame, FIG. 3 is a side view of the chassis frame, and FIG. IV-IV cross section of FIG. 2, and FIG. 5 shows the VV cross section of FIG.
[0013]
In the vehicle body structure of the present embodiment, as shown in FIGS. 2 and 3, the pair of left and right front side members 11 have a closed cross-sectional shape and are disposed along the front-rear direction on the side of the vehicle body. The part is joined to the front bumper hose 12. The rear end portion of each front side member 11 remains in a closed cross-sectional shape and is branched into a horizontal upper branch portion 13 and a lower branch portion 14 that curves downward, and curves outward to form left and right front pillars 15. It is joined. In this case, the upper branch portion 13 is joined to the front pillar 15 so as to face the end portion of the door impact bar 17 mounted in the front door 16, and the lower portion of the front door 16 is joined to the joined portion of the front pillar 15. Hinge reinforcement (hinge mounting portion) 18 is fixed. On the other hand, the lower branching portion 14 has a closed cross-sectional shape and continues to the front side sill 19 joined to the lower portion of the front pillar 15.
[0014]
The rear end of each front side sill 19 is joined to the rear bumper hose 20. Further, the left and right front floor side members 21 having a U-shaped cross section are disposed inside the front side sill 19, the front end portion is joined to the lower branch portion 14 of the front side member 11, and the rear end portion is the rear bumper hose 20. It is joined to. Further, rear end portions of the left and right front side members 11 are connected by a dash cross member 22. Reference numeral 23 denotes a front floor pan, and 24 denotes a front floor cross member.
[0015]
Hereinafter, the joining structure of the upper branch portion 13 and the lower branch portion 14 of the front side member 11 will be described in detail. As shown in FIG. 1, the front side member 11 is formed in a closed cross-sectional shape by joining a front side member inner 31 and a front side member outer 32 having a substantially U-shaped cross-sectional shape. Then, the rear end portion of the front side member 11 is curved outward, and the rear end portions of the front side member inner 31 and the front side member outer 32 have a W-shaped cross section, so that FIG. As shown, an upper branch portion 13 and a lower branch portion 14 are formed.
[0016]
On the other hand, the front pillar 15 is formed in a closed cross-sectional shape by joining a side panel outer 33 and a front pillar inner 34 having a U-shaped cross-sectional shape, and a front side sill 19 is joined to the lower portion so that the closed cross-sectional shape portion is rearward. It is extended to. The upper branch portion 13 of the front side member 11 is joined to the front pillar inner 34, and the lower branch portion 14 is joined to the front side sill 19 via the front pillar inner 34.
[0017]
A pair of upper and lower hinge reinforcements 18 (the upper part is not shown) are fixed in the front pillar 15. As shown in detail in FIG. 5, the lower hinge reinforcement 18 is an upper part of the front side member 11. A hinge 35 (upper hinge is not shown) is fixed to the side panel outer 33 corresponding to the hinge reinforcement 18 so as to be able to open and close the front door 16 in a position corresponding to the joint portion of the branch portion 13. Yes.
[0018]
The front door 16 includes a door inner panel 36 and a door outer panel 37, and a door impact bar 17 is mounted inside the front door 16. The front door 16 has an attachment portion 38 at the front end of the door impact bar 17, a front door 16. The hinge reinforcement 18 in the pillar 15 and the joint portion of the upper branch portion 13 of the front side member 11 are substantially in the same position.
[0019]
Furthermore, the front end of the front floor side member 21 is joined to the lower branching portion 14 of the front side member 11 via the front side member rear 39, and the front side member 11, the front side member rear 39, and the front floor side member 21 are As shown in FIG. 2, it is substantially straight.
[0020]
In FIG. 1, reference numeral 40 denotes a dash panel for partitioning the engine room and the guest room, and 41 denotes a front floor panel.
[0021]
As described above, in the vehicle body structure of the present embodiment, the rear end portion of the front side member 11 has a closed cross-sectional shape and branches into a horizontal upper branch portion 13 and a lower branch portion 14 that curves downward. Is joined to the front pillar 15 corresponding to the door impact bar 17 and a hinge reinforcement 18 is fixed thereto, while the lower branching portion 14 is joined to the front side sill 19 from the lower part of the front pillar 15 and the front floor side. The front end portion of the member 21 is joined so as to form a substantially straight line.
[0022]
Therefore, the closed cross-sectional shape portion continues from the upper branch portion 13 to the front pillar 15 of the front side member 11 and also continues from the lower branch portion 14 to the front side sill 19 and the front floor side member 21, which has sufficient strength. Is secured. The load input to the front side member 11 due to the front collision is dispersed from the upper branch portion 13 to the door impact bar 17 via the front pillar 15 and from the lower branch portion 14 to the front side sill 19 and the front floor side member 21. By absorbing and supporting this input load, it is possible to reliably prevent the cabin from being deformed.
[0023]
Further, since the rear end portions of the left and right front side members 11 are connected by the dash cross member 22, the front side member 11 is prevented from being bent and deformed toward the passenger compartment due to the input load, thereby preventing the passenger compartment from being deformed. it can. Further, the rear end portion of the front side member 11 is branched up and down, so that a space for the accelerator pedal is secured between the upper branch portion 13 and the lower branch portion 14 without reducing the strength for receiving the input load. it can.
[0024]
【The invention's effect】
As described above in detail in the embodiment, according to the vehicle body structure of the present invention, the closed cross-sectional shape portion is continuous from the upper branch portion of the side member to the pillar, and is continuous from the lower branch portion to the side sill and the floor side member. Therefore, sufficient strength can be secured to the body frame, and the input load due to collision in the front-rear direction is absorbed and supported by the front pillar and door impact bar, and by the side sill and front floor side member. In addition, it is possible to improve the safety by preventing deformation of the guest room.
[Brief description of the drawings]
FIG. 1 is a schematic view of a joining structure at a rear end portion of a front side member representing a vehicle body structure according to an embodiment of the present invention.
FIG. 2 is a plan view of a chassis frame.
FIG. 3 is a side view of a chassis frame.
4 is a cross-sectional view taken along the line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a plan view of a chassis frame representing a conventional vehicle body structure.
7 is a cross-sectional view taken along the line VII-VII of FIG.
[Explanation of symbols]
11 Front side member (side member)
13 Upper branch 14 Lower branch 15 Front pillar (pillar)
16 Door impact bar 18 Hinge reinforcement (hinge mounting part)
19 Front side sill (side sill)
21 Front floor side member (floor side member)
22 Dash cross member

Claims (1)

The rear end of a side member that is disposed along the front-rear direction on the side of the vehicle body and has a closed cross-sectional shape is branched into an upper branch and a lower branch extending downward, and the upper branch is used as a door. It is joined to the pillar so as to face the end of the provided door impact bar, and a hinge mounting part of a hinge connected to the door is provided at the joined part, while the lower branch part is connected to the side sill continuous with the pillar. A vehicle body structure characterized by being joined in a straight line to a front end portion of a floor side member that joins and supports the floor of the vehicle body.

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