JPH05116646A - Front structure for automobile body - Google Patents

Abstract

PURPOSE:To provide automobile body front structure allowing contact area between a tire and a body side member to be made large at the time of a collision in forward travel so that deformation load applied to the body side member such as a locker can be kept high. CONSTITUTION:In this automobile body front structure, there is provided a front side member 30 formed into closed cross section by an inner panel 32 and an outer panel 34 and disposed at the side part in the body cross direction, and the rear connected part of a suspension arm provided with two longitudinally spaced connected parts is connected to the front side member 30. The front side member 30 is provided with plural beads, extended vertically at longitudinal spaces apart, at the inner panel 32 part opposed to a connection part 31 to the rear connected part of the suspension arm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front structure of a vehicle body, and more particularly to a front side member which is disposed on each of two lateral sides of the vehicle body and extends in the front-rear direction. The present invention relates to a front structure of an automobile body to which a rear coupled portion of a suspension arm having two coupled portions spaced in the front-rear direction is coupled.

[0002]

2. Description of the Related Art As shown in FIG. 4, front side members 10 extending in the front-rear direction are arranged on two lateral sides of a vehicle body, and a floor frame 12 is extended rearward from each front side member 10. There is a front structure of a vehicle body in which a subframe 14 extending in the lateral direction of the vehicle body is connected to the front side member 10 and the floor frame 12 on each side (Japanese Utility Model Laid-Open No. 2-127591). With this front structure, the two coupled parts 18 spaced in the front-rear direction,
A suspension arm 16 having 19 is supported.

[0003]

When a vehicle traveling in a forward direction collides, the load in the front-rear direction from the front portion of the vehicle body is transmitted to the tire 20 via the engine block or the like. The suspension arm 16 that supports the tire 20 is not deformed because of its high strength, and the load is transmitted to the floor frame 12. However, since the floor frame 12 is formed of an elongated member, it buckles at a low load. as a result,
The suspension arm 16 and the tire 20 are deformed backward with a relatively low load, and the amount of impact energy absorbed is small.

The front side member 10 is connected to a side sill or a rocker 24 via a torque box 22, but the torque box 22 hardly conveys a load at the time of a collision to the rocker 24 (see the above-mentioned pages 4, 1 to 3).
line). Therefore, the load is transmitted from the front side member 10 to the rocker 24 through the torque box 22 and the rocker 2
Absorption of impact energy by deforming 4 cannot be expected.

On the other hand, if the rocker 24 is directly deformed by the retracted tire 20, the amount of impact energy absorbed can be increased.
2 or the contact area with the rocker 24 is small, only a small deformation load is applied to the rocker 24.

An object of the present invention is to increase the contact area between a tire and a member on the vehicle body side during a forward collision, and to keep a high deformation load applied to a member on the vehicle body side such as a rocker. To provide the front structure of the.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a front side member which is formed by an inner panel and an outer panel in a closed cross section and which is arranged at a lateral side portion of a vehicle body. 1 is a front structure of an automobile body to which a rear coupled portion of a suspension arm having two spaced apart coupled portions is coupled. The front side member has a plurality of beads extending in the up-down direction at intervals in the front-rear direction at a portion of the inner panel that faces a portion where the suspension arm is coupled to a rear portion to be coupled.

[0008]

[Operation and Effect] When a vehicle traveling in a forward direction collides, a load is applied to the tire via the engine block or the like, and a moment around the coupled portion in front of the suspension arm acts on the tire. At this time, the portion of the inner panel of the front side member that faces the portion to be joined to the joined portion behind the suspension arm is provided with a plurality of beads that extend in the up-down direction at intervals in the front-rear direction. The member buckles and deforms inward in the lateral direction of the vehicle body, and the tire faces laterally. This increases the contact area between the tire and the member on the vehicle body side.

When a car is traveling forward and collides,
As a result of the larger contact area between the tire and the body side member,
The load transmitted to the vehicle body can be kept high, and the amount of impact energy absorbed can be increased.

Since the inner panel of the front side member is provided with a plurality of beads, the weight does not increase. Further, the amount of impact energy absorbed can be increased by making a slight modification to the conventional front side member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, an automobile body front structure is arranged on each of two lateral sides of the vehicle body (only one side is shown in the drawing). A front side member 30 extending in the front-rear direction is provided. In this front structure, those having substantially the same structure or function as the parts used in the conventional front structure are given the same reference numerals,
Detailed description is omitted.

The front side member 30 is formed into a closed cross section by an inner panel 32 having a hat-shaped cross section and an outer panel 34 made of a flat plate. The front side member 30 has a suspension arm 1 having two coupled portions 18 and 19 that are spaced apart in the front-rear direction.
6 has a joining portion 31 to which the joined portion 19 behind 6 is joined, and further, an inner panel 32 facing the joining portion 31.
In this portion, a plurality of beads 33 extending in the vertical direction are provided at intervals in the front-back direction.

In the illustrated embodiment, the bead 33 is laser-quenched, and is provided in the front and back with the portion facing the coupling portion 31 being sandwiched therebetween. It is said that if the front side member is provided with a vertical bead, buckling deformation is likely to occur such that the bead becomes a valley when an impact load is applied. Therefore, if a plurality of beads 33 are provided, buckling deformation is likely to occur accordingly. In the present invention, the buckling deformation of the front side member 30 is reliably achieved by the plurality of beads 33 and the moment acting on the suspension arm 16. Bead 33
It can also be a recessed bead.

In the illustrated embodiment, the outer panel 34 is
A plurality of beads 35 extending in the front-rear direction at intervals in the up-down direction are provided in a range substantially facing the bead 33. The bead 35 is formed similarly to the bead 33. The plurality of beads 35 of the outer panel 34 can compensate for the decrease in the rigidity of the entire front side member 30 as a result of providing the plurality of beads 33 extending in the vertical direction on the inner panel 32. That is, while the rigidity of the inner panel 32 is lowered by the plurality of beads 33, the rigidity of the outer panel 34 is increased by the plurality of beads 35, and the rigidity difference between the inner panel 32 and the outer panel 34 is increased and the overall rigidity is secured. .. Therefore, it is preferable to provide the outer panel 34 with a plurality of beads 35.

In the illustrated embodiment, the floor frame 36 has a portion 39 extending bilaterally outward from the portion 38 connected to the front side member 30 in the lateral direction of the vehicle body.
An inwardly extending portion 40. The outer portion 39 is connected to the rocker 24 and the inner portion 40 is connected to another floor frame 42. A reinforce 44 is arranged between the connecting portion 38 and the rocker 24, and the reinforce 44 and the outer portion 39 form a torque box.

The sub-frame 14 extends in the lateral direction of the vehicle body and has two connecting portions 46 and 47 at each end thereof. The connecting portions 46 and 47 are connected to the front side member 30 by rivets.

The suspension arm 16 has two coupled parts 18 and 19 which are spaced apart in the front-rear direction. In the illustrated embodiment, the front joined portion 18 is formed in a cylindrical shape and is attached to the sub-frame 14 so as to be swingable around an axis extending in the front-rear direction of the vehicle body. On the other hand, the rear coupled portion 19 is formed as a shaft extending in the front-rear direction of the vehicle body, and is attached to the coupling portion 31 of the front side member 30 so as to be swingable around the shaft. The mounting structure for the suspension arm 16 is known per se. The tire 20 is supported by the suspension arm 16 via a wheel carrier (not shown).

When a car traveling forward collides,
When the load F is applied to the tire 20 via the engine block or the like, a plurality of beads 33 are provided on the inner panel of the front side member 30, and as shown in FIG.
Since the moment around the coupled portion 18 in front of the suspension arm 16, that is, the clockwise moment M in the figure acts on the tire 20, the front side member 30 is seated inward in the lateral direction of the vehicle body. The tire 20 is bent and deformed, and the tire 20 is oriented in the lateral direction as illustrated. As a result, the contact area between the tire 20 and the member on the vehicle body side, that is, the reinforcement 40 or the reinforcement 40 and the rocker 24 becomes large, and the tire 20 pushes the member on the vehicle body with a large contact surface. Keep the deformation load of the body side member high.

Further, as shown in FIG. 2, if the reinforcement 45 is provided with a portion 45 projecting forward,
The portion 45 is deformed by the tire 20, as shown in FIG. 3, so that the impact energy can also be absorbed.

[Brief description of drawings]

FIG. 1 is a perspective view of a front side member provided in a front structure of an automobile body according to the present invention.

FIG. 2 is a plan view showing an upper half of a front structure of an automobile body according to the present invention.

FIG. 3 is a plan view showing the operation of the present invention.

FIG. 4 is a plan view showing an upper half of a front structure of a conventional automobile body.

[Explanation of symbols]

 16 Suspension Arm 18, 19 Joined Part 30 Front Side Member 32 Inner Panel 33, 35 Bead 34 Outer Panel

Claims (1)

[Claims] 1. A front side member which is formed by an inner panel and an outer panel in a closed cross section and is arranged on a lateral side portion of a vehicle body. Two front coupled members are provided on the front side member and are spaced apart in the front-rear direction. A front structure of an automobile body to which a coupled portion behind a suspension arm having a portion is coupled, wherein the front side member faces the coupling portion with the coupled portion behind the suspension arm. The front structure of the automobile body having a plurality of beads extending in the up-down direction at intervals in the front-back direction at the part.