JP3452237B2 - Car shock absorbing structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing structure for an automobile which absorbs a shock force by axially compressing and deforming a side member during a collision.

[0002]

2. Description of the Related Art For example, in a one-box type vehicle in which a vehicle body is mounted on a vehicle body frame, conventionally, as shown in FIGS. 6 and 7, the left and right side members 50 extending in the front-rear direction are axially attached to each other. A plurality of beads 51a at intervals
There is a case where a shock absorbing structure is formed in which the beads 51a to 51d are formed and the side members 50 are induced to compressively deform in the axial direction at the time of collision (see, for example, JP-A-8-295259). .

By the way, in order to enhance the effect of absorbing the collision energy, the beads 51a, 51b, 51c, 51 on the front side are connected.
It is desirable to collapse in order of d. Therefore, when forming the beads 51a to 51d, each bead 51
It is general that the cross-sectional shapes of a to 51d are the same and the interval L between the beads 51a to 51d is constant (see Japanese Patent Laid-Open No. 61-287871).

[0004]

However, in the above-mentioned conventional structure, there is a possibility that any of the beads 51a to 51d may be crushed first at the time of collision. For example, in FIG.
As shown in (b), when the second and subsequent beads 51b are crushed first, the compression deformation between the front end face 50a of the side member 50 and the first bead 51a is not sufficiently performed, and as a result, However, there is a concern that a stable crash mode cannot be obtained because the amount of collision energy absorbed varies.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide a shock absorbing structure for an automobile capable of obtaining a stable crash mode during a collision.

[0006]

According to a first aspect of the present invention, the left and right side members, which extend in the front-rear direction of the vehicle body and have left and right side walls and a bottom wall and have a substantially hat-shaped cross section, are axially spaced from each other. Te to form a plurality of beads, in the impact absorbing structure of cab-over type vehicle in which so as to induce a compressive deformation in the axial direction to the side members at the time of collision by the bead, the
Between the front parts of the left and right side members,
Front side members of the left and right side members.
The above-mentioned multiple
A substantially U-shaped deformation guide in a plan view, which includes a flat plate portion that forms a bead and substantially covers the front end face of the side member, and left and right joints that are welded to the left and right walls. It is characterized in that a member is provided, and the flat plate portion is deformed so as to be recessed inwardly of the side member at the initial stage of the collision so that an inward pulling force is applied to the left and right side walls of the side member.

According to a second aspect of the present invention, in the first aspect, the distance from the front end face of the side member to the first bead is set wider than the distance between the remaining beads.

[0008]

According to the impact absorbing structure of the first aspect of the present invention, since the deformation inducing member having a U-shape in plan view is joined to the front end face of the side member, the deformation inducing member is affected by the impact energy at the initial stage of the collision. The flat plate is deformed so as to be pushed into the side member in a concave shape, and accordingly, the left and right joints exert a pulling force on the side member to pull the left and right side walls inward. As a result, the side members can be surely compressed and deformed from the front end portions of the left and right side walls in order, and as a result, the amount of collision energy absorbed can be made constant and a stable crash mode can be obtained.

According to the second aspect of the present invention, the distance from the front end surface of the side member to the first bead is made wider than the remaining bead distance, that is, the first section from the front end surface to the first bead has other beads. Since it is longer than the section, and the proof stress of the first section is weakened by this, the first section is more surely crushed earlier in the initial stage of the collision,
From this point, there is an effect that a more stable crash mode can be obtained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 are views for explaining a shock absorbing structure of an automobile according to an embodiment of the invention of claims 1 and 2, FIG. 1 is an exploded perspective view of a front end portion of a side member, and FIG. 2 is a side member. 3 is a sectional plan view of FIG.
3A is a side view of the side member, FIG. 3B is a schematic view showing a crash mode of the side member, FIG. 4 is an exploded perspective view of the vehicle body frame, and FIG. 5 is a side view of the vehicle body frame.

In the figure, reference numeral 1 is a front body frame of a cab-over type automobile, which is a front cross member 3 extending in the vehicle width direction between front portions of left and right side members 2 and 2 extending in the vehicle front-rear direction. It has a schematic structure in which A front body 6 having a front bumper 4, a front door 5 and the like is mounted on the vehicle body frame 1, and front wheels 7 are suspended and supported.

The front cross member 3 has a hat-shaped cross-section that opens upward, and has notches 3a formed at both ends thereof, and the side member 2 is inserted into each notch 3a. There is.

The side member 2 has a left side when viewed from the front,
It has a hat-shaped cross section composed of right side walls 2a and 2b and a bottom wall 2c, and a horizontal flange 2d is formed on the upper edges of the left and right side walls 2a and 2b. An upper plate 10 is arranged on the upper surface of the side member 2, and both end edges of the upper plate 10 are joined to the flange 2d. As a result, the side member 2 has a rectangular closed cross-sectional shape.

The front clips of the left and right side members 2 are
Left and right side walls 2a, 2b in front of the loss member joint
1 to 5 beads 11a to
11e are formed, and the beads 11a to 11e are arranged at intervals in the axial direction of the side member 2.
Each of the beads 11a to 11e is formed in a triangular shape in a cross section by recessing the corner portion inward.

Here, the bead shape is not limited to the triangular shape, and a concave bead having a length extending from the left and right side walls to the bottom wall or a convex bead may be formed, and particularly, the bead shape may be formed. It is not limited.

The interval L1 from the front end face 2e of the side member 2 to the first first bead 11a is the remaining second to fifth positions.
It is set to be slightly wider than the interval L2 between the beads 11b to 11e. The intervals L2 between the second to fifth beads 11b to 11e are set to have the same size.

On the front end face 2e of the side member 2, a deformation inducing plate 15 having a U-shape in plan view is provided.
The deformation inducing plate 15 is made of a metal plate having a thickness of about 0.6 mm, and has a rectangular flat plate portion 15a that covers the front end face 2e of the side member 2 and a front portion protruding to the left and right edges of the flat plate portion 15a. It is composed of the left and right joints 15b and 15c thus formed. The left and right joints 15b and 15c are joined to the outer surfaces of the left and right side walls 2a and 2b of the side member 2 by spot welding. It should be noted that the flat plate portion 15a may be formed into a curved surface that is convex forward.

The lower end surface 15a 'of the flat plate portion 15a is substantially flush with the lower surface of the bottom wall 2c of the side member, whereby the front end surface 2c' of the bottom wall 2c is covered by the flat plate portion 15a. The upper end surface 15a of the flat plate portion 15a is located slightly below the lower surface of the horizontal flange 2d (see FIG. 3).
(See (a)).

Next, the function and effect of this embodiment will be described. When an impact force acts on the side member 2 due to a frontal collision, the flat plate portion 15a is deformed by being pushed into the side member 2 so as to be recessed inward in the axial direction by the impact energy at the initial stage of the collision, and the left and right joints 15b, 15c
Applies a pulling force to the side member 2 to draw the front ends of the left and right side walls 2a and 2b inward (see FIG. 2). When the flat plate portion 15a is pushed into the side member 2, the lower end portion of the flat plate portion 15a pushes the bottom wall 2c downward, and the front end portion of the bottom wall 2c is projected downward (FIG. 3). (See (a)).

By the action of the above force, the left and right side walls 2
The front end portions of the a and 2b start to be compressed and deformed first, and the portion between the front end face and the first bead 11a is crushed by being induced by the compressive deformation, and subsequently, the second to fifth beads 11b are crushed. The bead-to-bead portions of 11e are crushed sequentially. In this case, each bead 11a to 11e becomes a valley and is compressed and deformed into a bellows shape having a mountain between each bead 11a to 11e (see FIG. 3B).

Further, in this embodiment, the side member 2 is used.
Since the interval L1 from the front end face 2e to the first bead 11a is set to be wider than the interval L2 of the other beads 11b to 11e, the proof stress of the interval L1 portion is weak, so that the interval L1 portion is more reliably deformed first. Will be done.

As described above, according to this embodiment, the deformation inducing plate 15 is disposed on the front end face 2e of the side member 2, and the left and right joints 15b and 15c are connected to the left and right side walls 2a and 2e.
Since it is joined to the outer surface of the side member 2b, the deformation inducing plate 15 is attached to the left and right side walls 2a, 2b of the side member 2 at the initial stage of collision as described above.
The pulling force acts so as to pull inwardly to induce a compressive deformation at the front end portion, whereby the side member 2 is surely deformed in order from the front end portion. As a result, the amount of collision energy absorbed can be made constant, and a stable crash mode can be obtained.

The spacing L1 from the front end face 2e of the side member 2 to the first bead 11a is set to the remaining bead 11a.
Since the width is made wider than the distance L2 of b to 11e, the distance L1 portion becomes weaker than the other portions, so that the portion between the front end face and the first bead 11a is crushed first more surely. A stable crash mode can be obtained from.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a front end portion of a side member for explaining a shock absorbing structure for an automobile according to an embodiment of the present invention.

FIG. 2 is a sectional plan view of a front end portion of the side member.

FIG. 3 is a diagram showing a state in which an impact force acts on the side member.

FIG. 4 is an exploded perspective view of a body frame of the automobile.

FIG. 5 is a side view of the vehicle body frame.

FIG. 6 is a perspective view showing a conventional general shock absorbing structure.

FIG. 7 is a diagram showing a conventional shock absorbing structure.

[Explanation of symbols]

2 side members 2a, 2b Side wall 2c bottom wall 2e Front end face 11a-11e beads 15 Deformation-inducing plate 15a Flat plate part 15b, 15c joint L1, L2 bead interval

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 8-175422 (JP, A) Actual Development 2-24777 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 21/15

Claims (2)

(57) [Claims] 1. A plurality of beads are formed at axially spaced intervals on left and right side members that extend in the front-rear direction of a vehicle body and have a left and right side wall and a bottom wall and have a substantially hat-shaped cross section. In a shock absorbing structure for a cab-over type automobile in which the side member is induced to undergo axial compressive deformation at the time of a collision , a vehicle between the front parts of the left and right side members is provided.
A front cross member extending in the width direction is joined to the left,
Before the front cross member joint of the right side member
A plurality of beads are formed on a side portion, and a flat plate shape is formed on a front end surface of the side member, which includes a flat plate portion that substantially covers the front end surface and left and right joint portions that are welded to the left and right walls. A U-shaped deformation guide member is provided, and the flat plate portion is deformed so as to be recessed inwardly of the side member at the initial stage of the collision so that an inward pulling force is applied to the left and right side walls of the side member. A shock absorbing structure for automobiles. 2. The shock absorbing structure for an automobile according to claim 1, wherein a distance from a front end face of the side member to a first bead is wider than a distance between the remaining beads.