JPH0789450A - Substructure of front pillar for automobile - Google Patents

Abstract

PURPOSE:To provide an automobile with a front pillar substructure improving impact absorbing efficiency and not increasing weight by transmitting collision input to a car body effectively at head-on collision. CONSTITUTION:In a substructure of an automobile front pillar having a reinforcing member 1 reinforcing the joining part 400 of the front pillar 200 and a side sill 300 by being arranged extendedly in the side sill 300 from the front pillar 200, the flange part 22 formed along the car body rear side edge part of the reinforcing member 1 is arranged extendedly to the rear side of a car body in the side sill 300, and the extendedly arranged part 23 is formed. This extendedly arranged part 23 is formed so as to have the upper side and lower side flange parts 23a and 23b to be joined respectively to the upper and lower flange parts 301b and 302b of the side sill 300 as well as to have the extendedly arranged edge 23c inclined to the front side of the car body toward the lower side flange part 23b from the upper side flange part 23a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substructure of a front pillar for an automobile.

[0002]

2. Description of the Related Art A lower part A of an automobile front pillar is shown in FIG.
As shown in, front pillar 200 and side sill 30
0 and 0 are connected to each other, which is a place where a severe load acts on the vehicle body structure.

Therefore, the lower part A of the front pillar for automobiles
Conventionally, various reinforcement structures have been adopted for
3-28585, JP-A-63-97473).

In this reinforcing structure, for example, as shown in FIG. 3, a reinforcing member 100 is attached to a joint between the front pillar 200 and the side sill 300. The reinforcing member 100 includes a reinforcing lower portion 101 mounted in the side sill 300 and a reinforcing upper portion 102 integrally formed with the reinforcing lower portion 101 and mounted in the front pillar 200. The reinforcement upper part 102 is the upper protrusion 102a.
Is formed in a hat-shaped cross-section having upper portions 102b for joining flanges on both sides of the reinforcing upper portion 10b.
It is formed by having a bag-shaped lower protrusion 101a and a joining flange lower portion 101b which are continuous with the second hat-shaped cross section. At this time, the lower portion 101b of the joining flange is lower than the lower protrusion 10.
1a is formed so as to surround it, and a rear end edge 101c located on the rear side of the vehicle body is formed as a vertical end edge so as to be orthogonal to the length direction of the side sill 300.

On the other hand, the front pillar 200 is composed of a pillar outer 201 which is integrally formed at its lower end with a sill outer 301 of the side sill 300, and a pillar inner 202 which is joined to the pillar outer 201. At this time, the pillar outer 201 and the pillar inner 2
No. 02 is formed in a hat-shaped cross section having joining flange portions 201b and 202b on both sides of the outer protrusion 201a and the inner protrusion 202a, and the hat is provided at the connecting portion 400 of the pillar outer 201 and the sill outer 301. A recessed portion that communicates with the cross section is formed.

The side sill 300 is composed of a sill outer 301 integrally connected to the pillar outer 201 and a sill inner 302 joined to the sill outer 301. At this time, the sill outer 301 is formed in a hat-shaped cross section with the joining flanges 301b on both sides of the curved outer protrusion 301a, and the sill inner 302 is formed on both sides of the inner protrusion 302a.
And has a hat-shaped cross section.

The reinforcing member 100 has an upper protrusion 102a.
Is fitted into the outer projection 201a of the pillar outer 201, and the lower projection 101a is fitted into the recess of the coupling portion 400, so that the front pillar 20 as a skeletal member of the vehicle body
0 and side sill 300. The front pillar 200 and the side sill 300 are the pillar outer 2
01 and pillar inner joint 202
b and 202b are abutted, and the flange portions 301b and 30 for joining the sill outer 301 and the sill inner 302 are joined together.
It is formed by butt-joining 2b and spot welding.

At this time, the places where the joining flange lower part and upper part 101b and 102b of the reinforcing member 100 are present are
The lower and upper parts 101b and 102b of each flange are positioned between the joining flange parts of the side sill 300 and the front pillar 200, and are triple-bonded.

[0009]

However, in the above-mentioned lower structure of the conventional automobile front pillar, the rear edge 101c of the joining flange lower portion 101b of the reinforcing member 100 is formed as a vertical edge. The sill cross-section strength of the side sill 300 changes abruptly at the location with and without the joining flange lower portion 101b. Therefore, as shown in FIG. 2, when the collision input P is input to the hood ledge reinforcement 500 during a frontal collision, the side sill 3
The buckling stress is concentrated in the area where 00 has a sudden change in the cross-sectional strength of the sill described above, and there is a risk of breakage as indicated by the two-dot chain line.
For this reason, conventionally, the plate thickness of the sill outer 301 and / or the sill inner 302 forming the side sill 300 is increased in order to prevent the breakage, but this causes a problem that the weight increases.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent an increase in weight of a vehicle body and to effectively transmit a collision input at the time of a frontal collision to the vehicle body to improve impact absorption efficiency. The purpose of the invention is to provide a substructure of a front pillar for an automobile.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 has a reinforcing member which extends from the front pillar into the side sill and reinforces a joint portion between the front pillar and the side sill. In a lower structure of a front pillar for an automobile, a flange portion formed along a side edge portion on a rear side of a vehicle body of the reinforcing member is extended to a rear side of the vehicle body in the side sill to form an extended portion. An extension having an upper side flange and a lower side flange portion joined to the upper and lower flange portions of the side sill, respectively, and inclined toward the front side of the vehicle body from the upper side flange portion toward the lower side flange portion. It is characterized in that it is formed with an edge.

The invention according to claim 2 is the lower structure of the front pillar for an automobile according to claim 1, wherein the included angle between the upper edge of the upper flange of the extending portion and the extending end edge is substantially the same. It is characterized in that it is formed at 45 °.

[0013]

According to the invention of claim 1, the extending portion of the flange portion formed on the reinforcing member has an upper side and a lower side flange portion, and is inclined toward the front side of the vehicle body from the upper side flange portion toward the lower side flange portion. Since it is formed with an extended edge that
By joining the upper side flange part to the upper side flange part of the side sill, the buckling compression side of the side sill at the time of a frontal collision is reinforced, and the side sill cross-section strength of this reinforced part is changed to mitigate the sudden change in strength. The shearing force acting on this reinforced portion is effectively transmitted to the vehicle body.

Further, according to the invention of claim 2, since the included angle between the upper edge of the upper flange portion of the extending portion and the extending end edge is formed to be approximately 45 °, the shearing force acting on the reinforcing portion is further effective. To the car body.

[0015]

The present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 1 shows a lower structure of an automobile front pillar as one embodiment. This lower structure corresponds to the portion A in FIG. 2, and is composed of the reinforcing member 1 and a skeleton member including the front pillar 200 and the side sill 300.

The reinforcing member 1 is composed of a reinforcing lower portion 2 mounted in the side sill 300 and a reinforcing upper portion 3 formed integrally with the reinforcing lower portion 2 and mounted in the front pillar 200. The reinforced upper portion 3 is formed in a hat-shaped cross section having joining flange upper portions 32 on both sides of the upper protruding portion 31, and the reinforced lower portion 2 is a bag-shaped lower protruding portion 21 continuous with the hat-shaped cross section of the reinforced upper portion 3. And a joining flange lower portion 22. At this time, the flange portion 22 for joining
Is formed so as to surround the lower protrusion 21, and a portion located on the rear side of the vehicle body is extended to the rear side of the vehicle body to form an extended portion 23. The extended portion 23 has upper and lower flange portions 23a and 23b joined to the upper and lower flange portions of the side sill 300, and is inclined toward the front side of the vehicle body from the upper flange portion 23a toward the lower flange portion 23b. It is formed to have an extended edge 23c. At this time, the extended portion 23 is formed such that the included angle α between the upper edge of the upper side flange portion 23a and the extended end edge 23c is approximately 45 °.

On the other hand, the front pillar 200 and the side sill 300 are constructed in the same manner as the conventional one. That is, the front pillar 200 has a pillar outer 201 formed in a hat-shaped cross section having joining flanges 201b on both sides of the outer protrusion 201a, and joining flanges 202b on both sides of the inner protrusion 202a. Pillar inner 20 formed in a hat-shaped cross section and joined to a pillar outer 201
2 and. Pillar outer 201 at this time
Is formed by integrally connecting the lower end thereof to the sill outer 301.

The side sill 300 has a sill outer 301 formed in a hat-shaped cross section having a joining flange portion 301b on both sides of the curved outer protrusion 301a, and a joining flange portion 302b on both sides of the inner protrusion 302. And a sill inner 302 having a hat-shaped cross section and joined to a sill outer 301.

The reinforcing member 1 has its upper projection 31 fitted in the outer projection 201a of the pillar outer 201, and its lower projection 21 fitted in the recess of the joint 400 of the pillar outer 201 and the sill outer 301. Then, it is mounted in the front pillar 200 and the side sill 300 as a frame member of the vehicle body. This front pillar 200
Also, the side sill 300 abuts the joining flange portions 201b and 202b of the pillar outer 201 and the pillar inner 202, and the sill outer 301 and the sill inner 30
It is formed by abutting and spot welding the two joining flange portions 301b and 302b.

At this time, in the reinforcing member 1, the upper portion 32 of the flange for joining has a pillar outer 201 and a pillar inner 20.
It is located between the two joining flange portions 201b and 202b and is triple-bonded, and the upper side and lower side flange portions 23a and 23b of the extending portion 23 thereof have the sill outer 30.
1 and the sill inner 302 are located between the joining flange portions 301b and 302b and are triple-bonded.

In the lower structure of the front pillar for an automobile constructed as described above, the buckling compression side of the side sill 300 at the time of a frontal collision is the upper side flange portion 2 of the extending portion 23 of the reinforcing member 1.
The cross-sectional strength of the side sill 300 at this reinforced portion is reinforced by the joining of 3a, and the cross-sectional strength of the side sill 300 is gradually changed by the sloping extending edge 23c of the extending portion 23 to mitigate the sudden change in strength. Since the shearing resistance acting on this reinforcing portion can be effectively transmitted to the vehicle body, it is possible to improve the impact absorption efficiency in the case of a frontal collision.

Further, in this embodiment, the extending portion 23 of the reinforcing member 1 is formed so that the included angle α between the upper edge of the upper side flange portion 23a and the extending end edge 23c is approximately 45 °. Therefore, the above-mentioned shear resistance can be more effectively transmitted to the vehicle body, and the impact absorption efficiency can be further improved.

[0024]

As described in detail above, according to the invention described in claim 1, the extending portion of the flange portion formed in the reinforcing member has the upper side and the lower side flange portion, and from the upper side flange portion. Since it is formed with an extended edge that inclines toward the front side of the vehicle body toward the lower side flange part, by joining the upper side flange part to the upper flange part of the side sill, the seat of the side sill at the time of a frontal collision In addition to reinforcing the flexural compression side, the side sill cross-section strength of this reinforced part is changed to alleviate the sudden change in strength, and the shearing force acting on this reinforced part can be effectively transmitted to the vehicle body. It is possible to improve.

Accordingly, the invention according to claim 1 does not increase the weight of the vehicle body, and effectively transmits the collision input at the time of a frontal collision to the vehicle body to improve the impact absorption efficiency. A structure can be provided.

Further, according to the invention of claim 2, since the included angle between the upper edge of the upper flange portion of the extending portion and the extending end edge is formed to be approximately 45 °, the shearing force acting on the reinforced portion is reduced. It can be more effectively transmitted to the vehicle body, and the shock absorption efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a lower structure of a front pillar for an automobile as one embodiment.

FIG. 2 is a side view showing a skeleton structure of a conventional vehicle body.

FIG. 3 is an exploded perspective view showing a lower structure of a conventional automobile front pillar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reinforcement member 22 Lower part of the flange for joining (flange part formed along the rear side side part of the reinforcement member on the vehicle body side) 23 Extended part 23a Upper side flange part (of extended part) 23b Lower side flange part (extended part) 23c Extended edge (of extended portion) 32 Upper part of joining flange (of reinforcing member) α Inclined angle 200 Front pillar 300 Side sill 400 Joint part (of front pillar and side sill) 301b Joining flange part (of sill outer) 302b Joint flange (for sill inner)

Claims (2)

[Claims] 1. A lower structure of a front pillar for an automobile, comprising a reinforcing member which extends from a front pillar into a side sill and reinforces a connecting portion between the front pillar and the side sill, wherein a rear side edge portion of the vehicle body of the reinforcing member. An extended portion is formed by extending a flange portion formed along the above to the rear side of the vehicle body in the side sill, and the extended portion is joined to the upper and lower flange portions of the side sill, respectively. And a lower side flange portion, and is formed to have an extended end edge that is inclined from the upper side flange portion toward the lower side flange portion toward the front side of the vehicle body. Substructure. 2. The lower structure for a front pillar for an automobile according to claim 1, wherein an included angle between an upper edge of the upper flange portion of the extending portion and the extending end edge is formed to be approximately 45 °. The substructure of the front pillar for automobiles characterized by.