JPH07149260A - Car body front structure - Google Patents

Abstract

PURPOSE:To prevent bending deformation of front side members inside the car body by installing a strut member without play between a pair of front side members arranged on both lower sides in an engine room. CONSTITUTION:A pair of front side members 11 are arranged in parallel to the car body center line on both lower sides in an engine room. The rear part 11b is bent downward, and is welded to a dash panel 12 arranged so as to define the engine room and the interior inside. Both ends of a strut member 13 slightly shorter than a distance between both front side members 11 are installed through a bracket 14 in mutually opposing positions close to a car body rar part welded to the dash panel 12. Thereby, when an axial directional compressive load of the front side members 11 acts at collision time, a condition that the front side members 11 fall inside a car body or bending deformation is caused, can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body front structure having front side members.

[0002]

2. Description of the Related Art A pair of front side members are provided on both front and lower sides in the engine room at the front of a vehicle body. Since a power unit, which is a heavy load, is mounted on the front side members, high rigidity is required. In addition, it is necessary to meet the demand for weight reduction, and for that reason, it is formed in a pipe shape.

For example, FIG. 4 shows a part of a conventional vehicle body front structure provided with a front side member disclosed in Japanese Utility Model Laid-Open No. 63-11279, in which the front side member 1 is at the rear of the vehicle body. The side (the right side in FIG. 4) is fixed to the dash panel 2 that defines the engine room and the vehicle compartment side, and the outer side of the vehicle body is a side sill 4 and a front pillar 5 that are rigid portions of the vehicle body side portion. The cowl side panel 6 attached to the vehicle is connected to the cowl side panel 6 via the gusset 3 so as to prevent the vehicle from falling down and bending.

[0004]

Therefore, in the above-mentioned conventional vehicle body front structure, the gusset 3 is reinforced to prevent the left and right front side members 1 from falling down or bending. However, Figure 5
As shown in FIG. 3, when a load that compresses the front side member 1 in the axial direction is applied at the time of a vehicle collision or the like, there is a problem that bending deformation easily occurs inside the vehicle body and axial compression deformation as designed does not occur. It was

The present invention has been made in view of the above problems, and an object thereof is to provide a vehicle body front portion structure capable of stably causing axial compression deformation of a front side member at the time of a collision or the like.

[0006]

As a means for solving the above-mentioned problems, a vehicle body front structure of the present invention includes a vehicle body front part, which is separated from a vehicle interior side by a dash panel, on both lower sides in an engine room. It has a pair of front side members respectively arranged substantially parallel to the center line of the vehicle body, and a tension member connecting the pair of front side members in the vicinity of the dash panel, and both ends of the tension members. However, each of the front side members is mounted so that there is no play between the front side members.

[0007]

As described above, the pair of front side members arranged on both lower sides in the engine room are connected by the projecting member made of steel pipe or the like in the vicinity of the dash panel, and the projecting members are Since it is mounted so that there is no play between the front side members, a bulge provided between the front side members when a compressive load acts in the axial direction of the front side members at the time of a collision or the like. The member prevents the front side member from collapsing toward the inside of the vehicle body and bending deformation, so that stable axial compression deformation occurs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be described based on.

In the vehicle body front structure of the present invention, a pair of square pipe-shaped front side members 11 (one of which is not shown) are arranged substantially parallel to the vehicle body center line on both lower sides in the engine room at the vehicle body front portion. Are installed and each front part 11a
Is substantially horizontally arranged at a predetermined height in the engine room, and the rear portion 11b is bent downward and welded to a dash panel 12 that is provided so as to define the engine room and the vehicle interior. Further, it extends under the lower end of the dash panel 12 so as to extend substantially horizontally inside the vehicle interior (right side in FIG. 1). Then, inside the vehicle body of the front portions 11a of the front side members 11 on both sides, at a position facing each other on the rear side of the vehicle body welded to the dash panel 12, a length slightly shorter than the distance between the both front side members 11. Both ends of the projecting member 13 made of round steel pipe are attached via brackets 14, respectively.

The projecting member 13 made of round steel pipe is
A partition plate 13a is provided at a position slightly distant from both ends of the inside thereof to be closed. The bracket 14 is a cylindrical locking portion having an outer diameter that fits inside the end portion of the projecting member 13 and a length shorter than the dimension from the end portion of the projecting member 13 to the partition plate 13a. 14a and a plate-shaped mounting portion 14b fixed to one end of the locking portion 14a. Then, the bracket 1 is attached to both ends of the projecting member 13.
No. 4 locking parts 14a are fitted inside, and the heat-foamable resin 1 is placed in the space formed between the tip of the fitted locking parts 14a and the partition plate 13a in the tension member 13.
5 is filled. In addition, the outer peripheral surface of the locking portion 14a,
A thermosetting adhesive 16 that cures at a temperature higher than the foaming temperature of the heat-foamable resin 15 is applied between the inner peripheral surface of the end of the tension member 13 in which this is fitted, and The same thermosetting adhesive 16 is also applied between the mounting portion 14a of the bracket 14 and the side surface of the front side member 11 on the inner side of the vehicle body.

As for the method of mounting the projecting member 13 between the front side members 11, first, the unexpanded heat-foaming resin 15 is filled inside both ends of the projecting member 13, and then the bracket 14 is attached. After the uncured thermosetting adhesive 16 is applied to the outer peripheral surface of the locking portion 14a and fitted into the respective end portions to form an assembly, the mounting surface of the mounting portion 14b of the bracket 14 is not yet attached. The thermosetting adhesive 16 for curing is applied, and the mounting surface coated with the adhesive is adhered to a predetermined position on the side surface of the front side member 11, and is temporarily fixed by an adhesive tape or the like so that the mounting position is not displaced. I'll do it. Then, for example, when heated in the drying furnace in the coating process, the heat-foamable resin 15 is first heated to foam. As a result, the heat-foamable resin 15 filled in the end portion of the projecting member 13 foams to increase the volume, and the locking portion 14 fitted in the end portion.
Pressing a in the pushing direction eliminates play between the bracket 14 and the bracket 14, and the mounting surface of the mounting portion 14b of the bracket 14 is pressed against the side surface of the front side member 11. When heated in this state to a higher temperature, the thermosetting adhesive 16 is hardened this time to fix the bracket 14 to a predetermined position on the side surface of the front side member 11 and to the locking portion 14a of the bracket 14. The end portion of the thrust member 13 is fixed. Therefore, processing errors and assembly errors of the front side member 11 are absorbed,
Further, in order to facilitate the assembling work, the projecting member 13 cut to a size slightly shorter than the distance between the front side members 11 can be securely attached without play or play.

Each front side member 11 has a torque box 17 on the outside of the vehicle body below the rear portion 11b thereof.
And the outside of the vehicle body of the front portion 11a thereof,
It is connected to the side panel of the suspension tower 18 and the side panel of the tire house 20 between the upper apron upper member 19 and the front side member 11 so as to prevent the vehicle body from falling down or bending.

Next, the operation of this embodiment configured as described above will be described. The pair of front side members 11 arranged at the front part of the vehicle body are provided with a pair of front side members 11 when the vehicle collides. When a load is applied to the front side member 11 from the front, that is, when a compressive load is applied in the longitudinal direction of the front side member 11, the outside of the vehicle body of the front portion 11a is connected to the tire house 20 or the like to the outside of the vehicle body. The bending deformation is suppressed, and the bending deformation of the front portion 11a toward the inside of the vehicle body is suppressed by the projecting member 13. Therefore, since the front side member 11 is axially compressed and deformed without being bent and deformed, it is possible to increase the amount of absorption of collision energy and the like as compared with the case where the front side member 11 is bent and deformed.

In this embodiment, as a method for mounting the tension member 13 between the front side members 11 without play, a partition plate 13 in the tension member 13 is used.
The heat-foamable resin 15 in an unfoamed state is filled between a and the engaging portion 14a of the bracket 14 so as to be foamed when heated in the painting process. Connect the end of the tension member 13 to the front side member 1
A method such as welding and attaching to the side surface of No. 1 can be considered.

[0015]

As described above, in the vehicle body front structure of the present invention, since the projecting member is mounted between the pair of front side members without any play, the front side members are bent and deformed toward the inside of the vehicle body. Can be prevented, and stable axial compression deformation can be generated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a vehicle body front structure of the present invention.

FIG. 2 is a sectional front view showing a state in which a tension member is attached to a side surface of a front side member in this embodiment.

FIG. 3 is an explanatory diagram showing directions of forces acting on a front portion of a front side member in this embodiment.

FIG. 4 is a perspective view showing a main part of a conventional vehicle body front structure.

FIG. 5 is an explanatory diagram showing directions of forces acting on a front portion of a front side member in a conventional vehicle body front structure.

[Explanation of symbols]

 11 Front Side Member 11a Front Part 12 Dash Panel 13 Stretching Member 13a Partition Plate 14 Bracket 14a Locking Part 14b Attachment Part 15 Heat-Expandable Resin 16 Thermosetting Adhesive

Claims (1)

[Claims] 1. A pair of front side members disposed substantially parallel to a vehicle body center line on both lower sides in an engine room at a front portion of the vehicle body separated from a vehicle interior side by a dash panel, and the pair of front members. Side members,
A vehicle body having a projecting member connected in the vicinity of the dash panel, and both ends of the projecting member are attached so that there is no play between the projecting member and the front side members. Front structure.