JPH04126677A - Front side member structure of vehicle body - Google Patents
Front side member structure of vehicle bodyInfo
- Publication number
- JPH04126677A JPH04126677A JP24835790A JP24835790A JPH04126677A JP H04126677 A JPH04126677 A JP H04126677A JP 24835790 A JP24835790 A JP 24835790A JP 24835790 A JP24835790 A JP 24835790A JP H04126677 A JPH04126677 A JP H04126677A
- Authority
- JP
- Japan
- Prior art keywords
- vehicle body
- front side
- side member
- bead
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011324 bead Substances 0.000 claims abstract description 42
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、自動車車体のフロントボデー下部に配設され
た車体のフロントサイドメンバ構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a front side member structure of a vehicle body, which is disposed at the lower part of the front body of an automobile body.
従来、フロントボデー下部に配設されたフロントサイド
メンバの車体前側端部は、フロントサブフレームの車体
前側端部よりも車体前方へ突出されており、車体前方か
らの荷重が全てフロントサイドメンバＮに加わるように
なっている。Conventionally, the front end of the front side member disposed at the bottom of the front body protrudes further forward than the front end of the front subframe, and all the load from the front of the vehicle is transferred to the front side member N. They are starting to join.
このため、フロントサイドメンバのエネルギ吸収性を向
上するための車体のフロントサイドメンバ構造が実開昭
５６−６４８７１号公報に開示されている。For this reason, a front side member structure of a vehicle body for improving the energy absorption performance of the front side member is disclosed in Japanese Utility Model Application Publication No. 56-64871.
第７図に示される如く、この車体のフロントサイドメン
バ構造のフロントサイドメンバ７０には、フロントサイ
ドメンバ７０の軸方向く車体前後方向）と略直交するビ
ード７２が複数本設けられており、フロントサイドメン
バ７０に車体前方から荷重Ｆが作用した場合には、フロ
ントサイドメンバ７０がビード７２により軸方向に圧縮
変形し、この軸圧縮によってフロントサイドメンバ７０
に車体前方から作用する荷重Ｆのエネルギーを吸収する
ようになっている。As shown in FIG. 7, the front side member 70 of the front side member structure of this vehicle body is provided with a plurality of beads 72 that are substantially orthogonal to the axial direction of the front side member 70 (vehicle body longitudinal direction). When a load F is applied to the side member 70 from the front of the vehicle body, the front side member 70 is compressed and deformed in the axial direction by the bead 72, and due to this axial compression, the front side member 70
It is designed to absorb the energy of the load F that acts from the front of the vehicle.
しかしながら、この車体のフロントサイドメンバ構造で
は、フロントサイドメンバ７０の全塑性荷重の車体前後
方向の分布が、略一定とされており、フロントサイドメ
ンバ７０に車体前方から荷重Ｆが作用した場合には、フ
ロントサイドメンバ７０を前方から後方へ向けて順に圧
縮変形させることができなかった。However, in this front side member structure of the vehicle body, the distribution of the total plastic load of the front side member 70 in the longitudinal direction of the vehicle body is approximately constant, and when a load F is applied to the front side member 70 from the front of the vehicle body, , it was not possible to sequentially compress and deform the front side member 70 from the front to the rear.
本発明は上記事実を考慮し、フロントサイドメンバに車
体前方から作用する荷重に対して、フロントサイドメン
バを前方から後方へ向けて順に圧縮変形させることがで
きる車体のフロントサイドメンバ構造を得ることが目的
である。In consideration of the above facts, the present invention provides a front side member structure for a vehicle body that can sequentially compress and deform a front side member from the front to the rear in response to a load acting on the front side member from the front of the vehicle body. It is a purpose.
本発明は、車体前後方向へ延びるフロントサイドメンバ
の側面に車体前後方向に延びるビードを設け、このビー
ドを後方へ向けて徐々に車体上下方向へ広幅とすると共
にビードの本数を後方へ向けて徐々に増加させたことを
特徴としている。The present invention provides a bead extending in the longitudinal direction of the vehicle body on the side surface of a front side member extending in the longitudinal direction of the vehicle body, and gradually increases the width of the bead in the vertical direction of the vehicle body toward the rear, and gradually increases the number of beads toward the rear. It is characterized by an increase in
本発明によれば、フロントサイドメンバに車体前方から
荷重が加わると、フロントサイドメンバが圧縮変形する
。この場合、フロントサイドメンバの側面に設けられ車
体前後方向に延びるビードが、後方へ向けて徐々に車体
上下方向へ広幅とされると共にビードの本数が後方へ向
けて徐々に増加されている。従って、フロントサイドメ
ンバの全塑性荷重の車体前後方向の分布が前部から後部
へ向けて徐々に高くなっている。このため、フロントサ
イドメンバに車体前方から作用する荷重に対して、フロ
ントサイドメンバを前方から後方へ向けて順に圧縮変形
させることができる。According to the present invention, when a load is applied to the front side member from the front of the vehicle body, the front side member is compressively deformed. In this case, the beads provided on the side surfaces of the front side members and extending in the longitudinal direction of the vehicle body are gradually made wider in the vertical direction of the vehicle body toward the rear, and the number of beads is gradually increased toward the rear. Therefore, the distribution of the total plastic load of the front side member in the longitudinal direction of the vehicle body gradually increases from the front toward the rear. Therefore, the front side member can be sequentially compressed and deformed from the front to the rear in response to a load acting on the front side member from the front of the vehicle body.
本発明の第１実施例を第１図〜第５図に従って言凭明す
る。A first embodiment of the present invention will be explained with reference to FIGS. 1 to 5.
なお、図中矢印ＦＲは車体前方方向を、矢印ＩＮは車体
内側方向を、矢印ＵＰは車体上方方向を示す。In the figure, arrow FR indicates the forward direction of the vehicle body, arrow IN indicates the inside direction of the vehicle body, and arrow UP indicates the upward direction of the vehicle body.
第１図に示される如く、車体のフロント部に配設された
フロントサイドメンバ１０は、車体幅方向外側を構成す
るフロントサイドメンバアウタ１２と、車体幅方向内側
を構成するフロントサイドメンバインナ１４とで構成さ
れている。As shown in FIG. 1, a front side member 10 disposed at the front portion of the vehicle body includes a front side member outer 12 constituting the outside in the vehicle width direction, and a front side member inner 14 constituting the inside in the vehicle width direction. It is made up of.
フロントサイドメンバインナ１４の車体前後方向から見
た断面形状は、開口部を車幅方向外側へ向けた口字状と
されている。フロントサイドメンバインナ１４の土壁部
１４Ａの車幅方向外側端部は、上方へ向けて屈曲されフ
ランジ１４Ｂとされており、フロントサイドメンバイン
ナ１４の下壁部１４Ｃの車幅方向外側端部は、下方へ向
けて屈曲されフランジ１４Ｄとされている。これらのフ
ランジ１４Ｂ１フランジ１４Ｄは、板状とされたフロン
トサイドメンバアウタ１２の上端縁部１２Ａ、下端縁部
１２Ｂに夫々車幅方向内側から溶着されている。The cross-sectional shape of the front side member inner 14 when viewed from the longitudinal direction of the vehicle body is in the shape of an opening with the opening facing outward in the vehicle width direction. The outer end in the vehicle width direction of the earth wall portion 14A of the front side member inner 14 is bent upward to form a flange 14B, and the outer end in the vehicle width direction of the lower wall portion 14C of the front side member inner 14 is bent upward. , is bent downward to form a flange 14D. These flanges 14B1 and 14D are welded to the upper end edge 12A and the lower end edge 12B of the plate-shaped front side member outer 12 from the inside in the vehicle width direction, respectively.
従って、フロントサイドメンバ１０は、フロントサイド
メンバアウタ１２とフロントサイドメンバインナ１４と
て、車体前後方向に連通ずる閉断面構造１６とされてい
る。Therefore, the front side member 10 has a closed cross-sectional structure 16 in which the front side member outer 12 and the front side member inner 14 communicate in the longitudinal direction of the vehicle body.
フロントサイドメンバインナ１４の縦壁Ｎ１４Ｅの後部
は、後方へ向けて徐々に車体上下方向の幅が広くされて
おり、フロントサイドメンバアウタ１２の後部も、後方
へ向けて徐々に車体上下方向の幅が広くされている。従
って、閉断面構造１６は、後方へ向けて上下方向に拡大
された構造とされている。The width of the rear part of the vertical wall N14E of the front side member inner 14 in the vertical direction of the vehicle body gradually increases toward the rear, and the width of the rear part of the front side member outer 12 gradually increases in width in the vertical direction of the vehicle body toward the rear. is widely used. Therefore, the closed cross-section structure 16 is expanded in the vertical direction toward the rear.
フロントサイドメンバインナ１４の前端部を除く縦壁部
１４Ｅには、車幅方向内側へ向けてビード１８が形成さ
れている。従って、フロントサイ ・ドメンバ１
０の前端部１０Ａの車体前後方向前側から見た断面形状
は第２図（Ａ）に示される如く、矩形状とされており、
この部位の応力分布は第２図（Ｂ）に示される如く、縦
壁部１４Ｅの上下方向端部に比べ上下方向略中央部が低
い分布となっている。A bead 18 is formed inward in the vehicle width direction on the vertical wall portion 14E of the front side member inner 14 excluding the front end portion. Therefore, front side member 1
The cross-sectional shape of the front end portion 10A of 0 when viewed from the front in the longitudinal direction of the vehicle body is rectangular, as shown in FIG. 2(A).
As shown in FIG. 2(B), the stress distribution in this region is lower at the substantially central portion in the vertical direction than at the end portions in the vertical direction of the vertical wall portion 14E.
このため、第５図に示される如く、フロントサイドメン
バ１０の前端部１０Ａ（第５図の範囲Ａ）の全塑性荷重
の分布は、フロントサイドメンバ１０の車体上下方向の
幅Ｈの増加により、若干後方が大きくなった分布となっ
ている。Therefore, as shown in FIG. 5, the distribution of the total plastic load on the front end portion 10A (range A in FIG. 5) of the front side member 10 changes as the width H of the front side member 10 in the vertical direction of the vehicle body increases. The distribution is slightly larger towards the rear.
第１図に示される如く、ビード１８の前部２０は、フロ
ントサイドメンバインナ１４の縦壁部１４Ｅの車体上下
方向略中央部に設けられており、車体後方へ向けて徐々
に車体上下方向の幅Ｌ１（第３図（Ａ）参照）が広くさ
れている。従って、、−の部位のフロントサイドメンバ
１０の車体前後方向前側から見た断面形状は第３図（Ａ
）に示される如く、車幅方向内側へ凸部が形成された矩
形状とされており、この部位の応力分布は第３図（Ｂ）
に示される如く、第２図（Ｂ）に比べ、縦壁部１４Ｅの
上下方向略中央部の低下が若干緩和された分布となって
いる。As shown in FIG. 1, the front portion 20 of the bead 18 is provided at approximately the center of the vertical wall portion 14E of the front side member inner 14 in the vertical direction of the vehicle body, and gradually increases in the vertical direction of the vehicle body toward the rear of the vehicle body. The width L1 (see FIG. 3(A)) is widened. Therefore, the cross-sectional shape of the front side member 10 at the part marked - when viewed from the front in the longitudinal direction of the vehicle is shown in Figure 3 (A
), it has a rectangular shape with a convex part formed inward in the vehicle width direction, and the stress distribution in this area is as shown in Figure 3 (B).
As shown in FIG. 2(B), the vertical wall portion 14E has a distribution in which the drop at approximately the center in the vertical direction is slightly reduced.
このため、第５図に示される如く、フロントサイドメン
バ１０のビード１８の前部２０に対応する部位（第５図
の範囲Ｂ）の全塑性荷重の分布は、フロントサイドメン
バ１０の車体上下方向の幅Ｈの増加による分布（第５図
の破線で示される分布）と、ビード１８の車体上下方向
の幅Ｌ１の増加とにより、後方が大きくなった分布とな
っている。Therefore, as shown in FIG. 5, the distribution of the total plastic load in the portion of the bead 18 of the front side member 10 corresponding to the front portion 20 (range B in FIG. 5) is as follows: Due to the increase in the width H (distribution shown by the broken line in FIG. 5) and the increase in the width L1 of the bead 18 in the vertical direction of the vehicle body, the distribution becomes larger at the rear.
第１図に示される如く、ビード１８の後部２２は、上側
ビード部２２Ａと下側ビード部２２Ｂとに分岐されてお
り、上側ビード部２２Ａと下側ビード部２２Ｂとの車体
上下方向の幅Ｌ２（第４図（Ａ）参照）が車体後方へ向
けて徐々に広くされている。従って、この部位のフロン
トサイドメンバ１０の車体前後方向前側から見た断面形
状は第４図（Ａ）に示される如く、車幅方向内側へ凸部
が２つ形成された矩形状とされており、この部位の応力
分布は第４図（Ｂ）に示される如く、第３図（Ｂ）に比
べ、縦壁部１４Ｅの上下方向中間部の低下が大幅に緩和
された分布となっている。As shown in FIG. 1, the rear part 22 of the bead 18 is branched into an upper bead part 22A and a lower bead part 22B, and the width L2 of the upper bead part 22A and the lower bead part 22B in the vertical direction of the vehicle body. (See FIG. 4(A)) gradually widens toward the rear of the vehicle. Therefore, the cross-sectional shape of this portion of the front side member 10 when viewed from the front in the longitudinal direction of the vehicle body is a rectangular shape with two convex portions formed inward in the vehicle width direction, as shown in FIG. 4(A). As shown in FIG. 4(B), the stress distribution at this location is such that the drop in the vertical middle portion of the vertical wall portion 14E is significantly reduced compared to FIG. 3(B).
このため、第５図に示される如く、フロントサイドメン
バ１０のビード１８の後部２２に対応する部位（第５図
の範囲Ｃ）の全塑性荷重の分布は、フロントサイドメン
バ１０の車体上下方向の幅Ｈの増加による分布（第５図
の破線で示される分布）と、上側ビード部２２Ａと下側
ビード部２２Ｂとの車体上下方向の幅Ｌ２の増加とによ
り、後方が大きくなった分布となっている。Therefore, as shown in FIG. 5, the distribution of the total plastic load in the area corresponding to the rear part 22 of the bead 18 of the front side member 10 (range C in FIG. 5) is as follows: Due to the distribution due to the increase in the width H (the distribution shown by the broken line in FIG. 5) and the increase in the width L2 of the upper bead portion 22A and the lower bead portion 22B in the vertical direction of the vehicle body, the distribution becomes larger at the rear. ing.
以下に本実施例の作用を説明する。The operation of this embodiment will be explained below.
本実施例によれば、フロントサイドメンバ１０に車体前
方から荷重が加わると、フロントサイドメンバ１０が圧
縮変形する。この場合、フロントサイドメンバインナ１
４の縦壁部１４Ｅに設けられ車体前後方向に延びるビー
ド１８が後方へ向けて徐々に車体上下方向へ広幅とされ
ると共に、ビード１８の本数が後方へ向けて１本から２
本に増加されている。従って、フロントサイドメンバ１
０の全塑性荷重の車体前後方向の分布が、第５図に示さ
れる如く、前部から後部へ向けて徐々に高くなっている
。このため、フロントサイドメンバ１０に車体前方から
作用する荷重に対して、フロントサイドメンバ１０を前
方から後方へ向けて順に圧縮変形させることができる。According to this embodiment, when a load is applied to the front side member 10 from the front of the vehicle body, the front side member 10 is compressively deformed. In this case, front side member inner 1
The bead 18 provided on the vertical wall portion 14E of No. 4 and extending in the longitudinal direction of the vehicle body gradually becomes wider in the vertical direction of the vehicle body toward the rear, and the number of beads 18 increases from 1 to 2 toward the rear.
Books have been increased. Therefore, front side member 1
The distribution of the total plastic load of 0 in the longitudinal direction of the vehicle body gradually increases from the front to the rear, as shown in FIG. Therefore, the front side member 10 can be sequentially compressed and deformed from the front to the rear in response to a load acting on the front side member 10 from the front of the vehicle body.
次に、本発明の第２実施例に付いて第６図に従って説明
する。Next, a second embodiment of the present invention will be described with reference to FIG.
なお、第１実施例と同一部材については、同一符号を付
してその説明を省略する。Incidentally, the same members as those in the first embodiment are given the same reference numerals and the explanation thereof will be omitted.
第６図に示される如く、本実施例においては、フロント
サイドメンバインナ１４の車幅方向内側側壁部１４Ｅに
、車幅方向内側へ突出され車体前後方向へ延びるビード
２６が複数本設けられている。これらのビード２６は、
車体上下方向の幅が後方へ向けて徐々に広幅とされると
共に、その本数が後方へ向けて徐々に増加するように配
置されている。As shown in FIG. 6, in this embodiment, a plurality of beads 26 that project inward in the vehicle width direction and extend in the longitudinal direction of the vehicle body are provided on the inner side wall portion 14E of the front side member inner 14 in the vehicle width direction. . These beads 26 are
They are arranged so that the width in the vertical direction of the vehicle body gradually increases toward the rear, and the number of them gradually increases toward the rear.
従って、本実施例においても、第１実施例と同等のフロ
ントサイドメンバ１０の全塑性荷重の分布が得られるた
約、フロントサイドメンバ１０に車体前方から作用する
荷重に対して、フロントサイドメンバ１０を前方から後
方へ向けて順に圧縮変形させることができる。Therefore, in this embodiment as well, the distribution of the total plastic load on the front side member 10 equivalent to that in the first embodiment can be obtained. can be compressed and deformed sequentially from the front to the rear.
なお、上記第１実施例及び第２実施例においては、ビー
ド１８及びビード２Ｇの各突出方向を、車幅方向内側と
したが、ビード１８の突出方向は、車幅方向外側として
も良い。また、上記第１実施例及び第２実施例において
は、ビード１８及びビード２６をフロントサイドメンバ
インナ１４の縦壁部１４Ｅに設けたが、ビードはフロン
トサイドメンバインナ１２に設けても良い。In the first and second embodiments, the bead 18 and the bead 2G each protrude inward in the vehicle width direction, but the bead 18 may protrude outward in the vehicle width direction. Further, in the first and second embodiments, the beads 18 and 26 are provided on the vertical wall portion 14E of the front side member inner 14, but the beads may be provided on the front side member inner 12.
本発明は上記構成としたので、フロントサイドメンバに
車体前方から作用する荷重に対してフロントサイドメン
バを前方から後方へ向けて順に圧縮度形させることがで
きるという優れた効果を有する。Since the present invention has the above configuration, it has an excellent effect that the front side member can be compressed in order from the front to the rear in response to a load acting on the front side member from the front of the vehicle body.
第１図は本発明の第１実施例に係る車体のフロントサイ
１メンバ構造を示す車体前方内側から見た斜視図、第２
図（Ａ）は第１図■−■線断面図、第２図（Ｂ）は第２
図（Ａ）の応力分布図、第３図（Ａ）は第１図ｌ−１１
１１１線断面図、第３図（Ｂ）は第３図（Ａ）の応力分
布図、第４図（Ａ）は第１図ＴＶ−ＩＶ線断面図、第４
図（Ｂ）は第４図（Ａ）の応力分布図、第５図は本発明
の第１実施例に係る車体のフロントサイドメンバ構造の
全塑性荷重の分布図、第６図は本発明の第２実施例に係
る車体のフロントサイドメンバ構造を示す車体前方内側
から見た斜視図、第７図は従来の車体のフロントサイド
メンバ構造を示す車体前方内側から見た斜視図である。
１０・・・フロントサイドメンバ、
１２・・・フロントサイドメンバアウタ、１４・・・フ
ロントサイドメンバインナ、Ｉ８．２６・ ・ ・ビー
ド、
２０・・・前部、
２２・・・後部、
２２Ａ・・・上側ビード部、
２２Ｂ・・・下側ビード部。FIG. 1 is a perspective view of the front side member structure of the vehicle body according to the first embodiment of the present invention, as seen from the front inside of the vehicle body;
Figure (A) is a sectional view taken along the line ■-■ in Figure 1, and Figure 2 (B) is a cross-sectional view taken along the line ■-■ in Figure 1.
The stress distribution diagram in Figure (A), Figure 3 (A) is the stress distribution diagram in Figure 1-11.
111 line sectional view, FIG. 3(B) is the stress distribution diagram of FIG. 3(A), FIG. 4(A) is the sectional view of FIG.
Figure (B) is a stress distribution diagram of Figure 4 (A), Figure 5 is a distribution diagram of the total plastic load of the front side member structure of the vehicle body according to the first embodiment of the present invention, and Figure 6 is a diagram of the distribution of the total plastic load of the front side member structure of the vehicle body according to the first embodiment of the present invention. FIG. 7 is a perspective view of the front side member structure of a vehicle body according to the second embodiment, as seen from the front inside of the vehicle body, and FIG. 7 is a perspective view of the conventional front side member structure of the vehicle body, seen from the front inside of the vehicle body. DESCRIPTION OF SYMBOLS 10...Front side member, 12...Front side member outer, 14...Front side member inner, I8.26...Bead, 20...Front part, 22...Rear part, 22A... - Upper bead part, 22B...lower bead part.
Claims (1)
面に車体前後方向に延びるビードを設け、このビードを
後方へ向けて徐々に車体上下方向へ広幅とすると共にビ
ードの本数を後方へ向けて徐々に増加させたことを特徴
とする車体のフロントサイドメンバ構造。(1) A bead extending in the longitudinal direction of the vehicle body is provided on the side surface of the front side member extending in the longitudinal direction of the vehicle body, and this bead is gradually widened in the vertical direction of the vehicle body toward the rear, and the number of beads is gradually increased toward the rear. The front side member structure of the vehicle body is characterized by an increase in the number of front side members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24835790A JPH04126677A (en) | 1990-09-18 | 1990-09-18 | Front side member structure of vehicle body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24835790A JPH04126677A (en) | 1990-09-18 | 1990-09-18 | Front side member structure of vehicle body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04126677A true JPH04126677A (en) | 1992-04-27 |
Family
ID=17176900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24835790A Pending JPH04126677A (en) | 1990-09-18 | 1990-09-18 | Front side member structure of vehicle body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04126677A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100312373B1 (en) * | 1992-10-26 | 2001-12-28 | 제임스 이. 미러 | Frame and car body structure |
| JP2009166697A (en) * | 2008-01-17 | 2009-07-30 | Nissan Motor Co Ltd | Front side member structure |
| JP2010089576A (en) * | 2008-10-06 | 2010-04-22 | Nissan Motor Co Ltd | Vehicle body member structure |
-
1990
- 1990-09-18 JP JP24835790A patent/JPH04126677A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100312373B1 (en) * | 1992-10-26 | 2001-12-28 | 제임스 이. 미러 | Frame and car body structure |
| JP2009166697A (en) * | 2008-01-17 | 2009-07-30 | Nissan Motor Co Ltd | Front side member structure |
| JP2010089576A (en) * | 2008-10-06 | 2010-04-22 | Nissan Motor Co Ltd | Vehicle body member structure |
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