JP4845777B2 - Shock absorption structure for vehicle frame - Google Patents

Shock absorption structure for vehicle frame Download PDF

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JP4845777B2
JP4845777B2 JP2007058420A JP2007058420A JP4845777B2 JP 4845777 B2 JP4845777 B2 JP 4845777B2 JP 2007058420 A JP2007058420 A JP 2007058420A JP 2007058420 A JP2007058420 A JP 2007058420A JP 4845777 B2 JP4845777 B2 JP 4845777B2
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shock absorbing
absorbing member
vehicle frame
surface portion
buckling deformation
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JP2008221863A (en
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満 小原
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Press Kogyo Co Ltd
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Description

本発明は、車両衝突時等に生じる衝撃エネルギを吸収するための車両用車枠の衝撃吸収構造に関する。   The present invention relates to an impact absorbing structure for a vehicle frame for absorbing impact energy generated during a vehicle collision or the like.

トラック等の車両用車枠の先端部に、車両衝突時等に生じる衝撃エネルギを吸収する目的でクラッシュボックスと称する衝撃吸収部材を設けているものがある。この衝撃吸収部材は、車両衝突時等に座屈変形し潰れることによって衝撃エネルギを吸収して、乗員へのダメージを低減するものである。   There is a type in which an impact absorbing member called a crash box is provided at the front end of a vehicle frame such as a truck for the purpose of absorbing impact energy generated when the vehicle collides. This impact absorbing member absorbs impact energy by buckling deformation and crushing at the time of a vehicle collision or the like, thereby reducing damage to the occupant.

また、車両衝突時等に衝撃吸収部材を安定的に座屈変形させるために、例えば特許文献１のように、衝撃吸収部材の外面部に、衝撃荷重が作用する方向（つまり、衝撃吸収部材の長手方向）と直交する方向にビード（座屈変形用ビード）を形成し、この座屈変形用ビードによって衝撃吸収部材の座屈変形を誘発させることによって、初期ピーク荷重の低減を図ったものが広く知られている。   Further, in order to stably buckle and deform the shock absorbing member at the time of a vehicle collision or the like, for example, as in Patent Document 1, the direction in which the shock load acts on the outer surface portion of the shock absorbing member (that is, the shock absorbing member) A bead (buckling deformation bead) is formed in a direction perpendicular to the longitudinal direction), and the buckling deformation of the impact absorbing member is induced by the buckling deformation bead, thereby reducing the initial peak load. Widely known.

特開平３−９４１３７号公報Japanese Patent Laid-Open No. 3-94137

しかし、上述のような座屈変形用ビードを形成した衝撃吸収部材では、座屈変形が始まる初期は比較的高い衝撃エネルギ吸収量を維持するが、座屈変形が進展し座屈変形用ビードが設けられていない平面部での折れ座屈変形が始まると急激に衝撃エネルギ吸収量が低下してしまう。衝撃吸収部材全体の座屈変形はビードでの座屈変形と平面部での折れ座屈変形とを繰り返しつつ進展していくが、衝撃吸収部材全体の座屈変形の過程で幾度も平面部での折れ座屈変形に伴う衝撃エネルギ吸収量の低下が起こるため、総衝撃エネルギ吸収量が低くなってしまう。   However, in the shock absorbing member formed with the buckling deformation bead as described above, a relatively high shock energy absorption amount is maintained at the beginning of the buckling deformation, but the buckling deformation progresses and the buckling deformation bead is When the bending buckling deformation starts at the flat portion that is not provided, the impact energy absorption amount is drastically reduced. The buckling deformation of the entire shock absorbing member progresses by repeating the buckling deformation at the bead and the bent buckling deformation at the flat surface part. Since the impact energy absorption amount decreases due to the bending buckling deformation, the total impact energy absorption amount becomes low.

そこで、本発明の目的は、衝撃吸収部材における平面部での折れ座屈変形に伴う衝撃エネルギ吸収量の低下を抑制することができ、総衝撃エネルギ吸収量が高い車両用車枠の衝撃吸収構造を提供することにある。   Therefore, an object of the present invention is to provide a shock absorbing structure for a vehicle frame that can suppress a decrease in impact energy absorption amount due to bending buckling deformation at a flat surface portion of the impact absorbing member and has a high total impact energy absorption amount. It is to provide.

上記目的を達成するために本発明は、車両用車枠の前後方向に延出する角筒状の衝撃吸収部材を備えた車両用車枠の衝撃吸収構造であって、上記衝撃吸収部材の外面部に上記衝撃吸収部材の長手方向に間隔を隔てて複数設けられ、上記衝撃吸収部材の長手方向と直交する方向に形成され、上記衝撃吸収部材を座屈変形させるための凸状のビードと、それら複数のビード間の上記衝撃吸収部材の内面部に上記衝撃吸収部材の長手方向と直交する方向に配置され、一端が上記衝撃吸収部材の内面部に固着されると共に他端が対面の内面部と間隔を隔てており、上記ビードを基点として起こる上記衝撃吸収部材の座屈変形の変形量を制限するための突支い部材とを備えたものである。   In order to achieve the above object, the present invention provides a shock absorbing structure for a vehicle frame including a rectangular tube-shaped shock absorbing member extending in the front-rear direction of the vehicle frame, and is provided on an outer surface portion of the shock absorbing member. A plurality of convex beads provided in the longitudinal direction of the shock absorbing member at intervals, formed in a direction perpendicular to the longitudinal direction of the shock absorbing member, and for buckling deformation of the shock absorbing member, and the plurality thereof Between the beads, the inner surface of the shock absorbing member is disposed in a direction perpendicular to the longitudinal direction of the shock absorbing member, and one end is fixed to the inner surface of the shock absorbing member and the other end is spaced from the facing inner surface. And a projecting support member for limiting the amount of buckling deformation of the shock absorbing member that occurs from the bead as a base point.

ここで、上記衝撃吸収部材の内面部に、上記突支い部材の上記他端が対向する部分に位置させて、上記突支い部材の上記他端が重合するように形成され、その他端を上記衝撃吸収部材の長手方向と直交する方向にガイドするためのガイド部材を設けても良い。   Here, the other end of the projecting member is formed on the inner surface of the impact absorbing member so that the other end of the projecting member is opposed to the other end. A guide member for guiding in a direction orthogonal to the longitudinal direction of the shock absorbing member may be provided.

また、上記突支い部材の上記他端に、上記衝撃吸収部材の内面部に対向するように形成された板状部材を装着しても良い。   Further, a plate-like member formed so as to face the inner surface of the shock absorbing member may be attached to the other end of the projecting support member.

また、上記突支い部材は、上記衝撃吸収部材の長手方向に間隔を隔てて複数設けられても良い。   A plurality of the support members may be provided at intervals in the longitudinal direction of the shock absorbing member.

また、上記衝撃吸収部材は、一対の溝形部材を向かい合わせて接合してなっても良い。   The shock absorbing member may be formed by joining a pair of groove-shaped members facing each other.

本発明によれば、衝撃吸収部材における平面部での折れ座屈変形に伴う衝撃エネルギ吸収量の低下を抑制することができ、総衝撃エネルギ吸収量が高い車両用車枠の衝撃吸収構造を提供することができるという優れた効果を発揮するものである。   ADVANTAGE OF THE INVENTION According to this invention, the fall of the impact energy absorption amount accompanying the bending buckling deformation in the plane part in an impact-absorbing member can be suppressed, and the impact absorption structure of the vehicle frame for vehicles with a high total impact energy absorption amount is provided. It exhibits an excellent effect of being able to.

以下、本発明の好適な実施形態を添付図面に基づいて詳述する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１は、本発明の一実施形態に係る衝撃吸収構造の斜視図である。図２（ａ）は図１の実施形態に係る衝撃吸収部材の横断面図であり、図２（ｂ）は図２（ａ）の１１ｂ−１１ｂ線矢視図である。   FIG. 1 is a perspective view of an impact absorbing structure according to an embodiment of the present invention. 2A is a cross-sectional view of the shock absorbing member according to the embodiment of FIG. 1, and FIG. 2B is a view taken along the line 11b-11b in FIG. 2A.

図示はしないが、本実施形態では、車両用車枠は、車幅方向に所定間隔を隔てて配置され、前後方向に延出する一対のサイドメンバと、サイドメンバ間に掛け渡して設けられ、幅方向に延出するクロスメンバとを有する。   Although not shown in the drawings, in this embodiment, the vehicle frame is disposed at a predetermined interval in the vehicle width direction, and is provided across a pair of side members extending in the front-rear direction and the side members. And a cross member extending in the direction.

図１及び図２に示すように、本実施形態に係る衝撃吸収構造１０は、車両用車枠のサイドメンバの前端部に設けられた衝撃吸収部材１１を備えている。衝撃吸収部材１１は、車両衝突時等に衝撃荷重を受けて、その衝撃荷重により座屈変形し潰れることによって衝撃エネルギを吸収するものである。本実施形態では、衝撃吸収部材１１は、サイドメンバに一体に設けられている。   As shown in FIG.1 and FIG.2, the impact-absorbing structure 10 which concerns on this embodiment is provided with the impact-absorbing member 11 provided in the front-end part of the side member of the vehicle frame. The impact absorbing member 11 receives impact load at the time of a vehicle collision or the like, and absorbs impact energy by buckling deformation and being crushed by the impact load. In the present embodiment, the shock absorbing member 11 is provided integrally with the side member.

衝撃吸収部材１１は、車両用車枠１の前後方向に延出する角筒状に形成されている。詳しくは、衝撃吸収部材１１は、側面の幅（衝撃吸収部材１１の高さ）が上下面の幅（衝撃吸収部材１１の幅）よりも大きい断面略矩形状（略長方形状）に形成されている。   The shock absorbing member 11 is formed in a rectangular tube shape that extends in the front-rear direction of the vehicle casing 1. Specifically, the shock absorbing member 11 is formed in a substantially rectangular shape (substantially rectangular shape) in which the width of the side surface (height of the shock absorbing member 11) is larger than the width of the upper and lower surfaces (width of the shock absorbing member 11). Yes.

衝撃吸収部材１１の外面部１２ａには、衝撃吸収部材１１の長手方向（車両用車枠の前後方向）に所定間隔を隔てて、衝撃吸収部材１１を座屈変形させるため（衝撃吸収部材１１の座屈変形を誘発させるため）の凸状のビード（座屈変形用ビード）１３が複数設けられている。ビード１３は、衝撃吸収部材１１の長手方向と直交する方向（車両用車枠の上下方向）に形成されている。   The outer surface 12a of the shock absorbing member 11 is buckled and deformed at a predetermined interval in the longitudinal direction of the shock absorbing member 11 (the longitudinal direction of the vehicle frame) (the seat of the shock absorbing member 11). A plurality of convex beads (buckling deformation beads) 13 for inducing bending deformation are provided. The beads 13 are formed in a direction perpendicular to the longitudinal direction of the shock absorbing member 11 (up and down direction of the vehicle frame).

本実施形態では、ビード１３は、衝撃吸収部材１１の側面をなす外面部１２ａに設けられている。   In the present embodiment, the bead 13 is provided on the outer surface portion 12 a that forms the side surface of the shock absorbing member 11.

また、本実施形態では、ビード１３は、断面略三角形状に形成されている（図２（ａ）参照）。   Moreover, in this embodiment, the bead 13 is formed in the cross-sectional substantially triangular shape (refer Fig.2 (a)).

複数のビード１３間の上記所定間隔は、車両用車枠の断面形状、肉厚、材質等に応じて、所望の衝撃エネルギ吸収量が得られるように決定される。   The predetermined interval between the plurality of beads 13 is determined so as to obtain a desired impact energy absorption amount according to the cross-sectional shape, thickness, material, etc. of the vehicle frame.

衝撃吸収部材１１を座屈変形させるためのビード１３を凸状にすることにより、車両衝突時等にビード１３での座屈変形がある程度進展すると、次にビード１３が設けられていない平面部１２ｃにて座屈変形が起こるが、この平面部１２ｃは凸状のビード１３の座屈変形に影響して内側に折れるように変形する（図３参照）。   By making the bead 13 for buckling deformation of the shock absorbing member 11 convex, if the buckling deformation at the bead 13 progresses to some extent at the time of a vehicle collision or the like, then the flat surface portion 12c where the bead 13 is not provided. However, the flat surface portion 12c is deformed so as to be bent inward due to the buckling deformation of the convex bead 13 (see FIG. 3).

衝撃吸収部材１１における複数のビード１３間の内面部１２ｂには、衝撃吸収部材１１の長手方向と直交し且つビード１３と直交する方向に配置された突支い部材１４が設けられている。突支い部材１４は、ビード１３を基点として起こる衝撃吸収部材１１の座屈変形の変形量を制限するためのものである。   On the inner surface portion 12 b between the plurality of beads 13 in the shock absorbing member 11, a projecting support member 14 disposed in a direction perpendicular to the longitudinal direction of the shock absorbing member 11 and perpendicular to the beads 13 is provided. The projecting support member 14 is for limiting the amount of buckling deformation of the shock absorbing member 11 that occurs with the bead 13 as a base point.

突支い部材１４は、衝撃吸収部材１１の長手方向に所定間隔を隔てて複数設けられている。突支い部材１４は、衝撃吸収部材１１における内面部１２ｂの上下方向の略中央に設けられている。また、突支い部材１４は、ビード１３間の内面部１２ｂでは前後方向の略中央に設けられている。   Plural support members 14 are provided at predetermined intervals in the longitudinal direction of the shock absorbing member 11. The projecting support member 14 is provided substantially at the center in the vertical direction of the inner surface portion 12 b of the shock absorbing member 11. Further, the projecting support member 14 is provided at the substantially center in the front-rear direction on the inner surface portion 12 b between the beads 13.

突支い部材１４は、一端が衝撃吸収部材１１の内面部１２ｂに溶接、リベット或いはボルト・ナット等により固着されると共に、他端が対面の内面部１２ｂと固着も接触もせず所定間隔（或いは隙間）Ｃ（例えば、５〜１０ｍｍ）を隔てている。そのため、突支い部材１４を、その他端が対面の内面部１２ｂとは接触しないように、衝撃吸収部材１１の内幅寸法よりも短いものとする。   One end of the projecting support member 14 is fixed to the inner surface portion 12b of the shock absorbing member 11 by welding, rivets, bolts, nuts, or the like, and the other end is not fixed to or contacted with the inner surface portion 12b of the facing surface. A gap (C) (for example, 5 to 10 mm) is separated. For this reason, the projecting member 14 is shorter than the inner width dimension of the shock absorbing member 11 so that the other end does not come into contact with the inner surface portion 12b facing each other.

本実施形態では、突支い部材１４は、衝撃吸収部材１１の側面をなす内面部１２ｂに設けられている。   In the present embodiment, the projecting support member 14 is provided on the inner surface portion 12 b that forms the side surface of the shock absorbing member 11.

また、本実施形態では、突支い部材１４は、円形管（パイプ）（例えば、直径１６ｍｍ）からなる。これには限定はされず、突支い部材１４は、Ｌ形部材（アングル材）或いは溝形部材（チャネル材）等からなってもよい。   In the present embodiment, the projecting member 14 is a circular pipe (pipe) (for example, 16 mm in diameter). However, the projecting member 14 may be formed of an L-shaped member (angle material) or a groove-shaped member (channel material).

複数の突支い部材１４間の上記所定間隔は、衝撃吸収部材１１における平面部１２ｃでの座屈変形による変位状況に応じて、所望の衝撃エネルギ吸収量が得られるように決定される。   The predetermined interval between the plurality of projecting members 14 is determined so as to obtain a desired impact energy absorption amount according to the displacement state due to buckling deformation in the flat surface portion 12 c of the impact absorbing member 11.

本実施形態では、衝撃吸収部材１１は、突支い部材１４が固着された溝形部材（チャネル材）１５と溝形部材１６を互いに向かい合わせて、それら一対の溝形部材１５、１６のフランジ部同士を溶接、リベット或いはボルト・ナット等により接合してなる。   In the present embodiment, the shock absorbing member 11 includes a groove member (channel material) 15 and a groove member 16 to which the projecting support member 14 is fixed, facing each other, and the flanges of the pair of groove members 15 and 16. The parts are joined by welding, rivets or bolts / nuts.

次に、本実施形態の作用を説明する。   Next, the operation of this embodiment will be described.

車両衝突時等には、バンパー（図示せず）等を介して衝撃吸収部材１１に車両用車枠の前後方向の前方から後方に向けて衝撃荷重Ｌ（図１参照）が作用する。衝撃荷重Ｌが衝撃吸収部材１１の弾性変形域を超えると衝撃吸収部材１１が座屈変形（塑性変形）し始めるが、衝撃吸収部材１１の長手方向と直交する方向に形成されたビード１３が衝撃吸収部材１１の座屈変形を誘発するため、最も前方側のビード１３が設けられた部分にて座屈変形が起こる。   At the time of a vehicle collision or the like, an impact load L (see FIG. 1) acts on the impact absorbing member 11 from the front to the rear in the front-rear direction of the vehicle frame via a bumper (not shown) or the like. When the impact load L exceeds the elastic deformation region of the impact absorbing member 11, the impact absorbing member 11 begins to buckle (plastically deform), but the bead 13 formed in the direction perpendicular to the longitudinal direction of the impact absorbing member 11 is impacted. In order to induce buckling deformation of the absorbing member 11, buckling deformation occurs in the portion where the frontmost bead 13 is provided.

次に、最も前方側のビード１３での座屈変形がある程度進展すると、そのビード１３の後方の平面部１２ｃにて座屈変形が起こるが、ビード１３が凸状であることから、平面部１２ｃはビード１３の座屈変形を受けて内側に向かって折れるように変形し始める（図３参照）。このとき、突支い部材１４はその他端が対面の内面部１２ｂと間隔を隔てており、平面部１２ｃの折れ座屈変形を妨げないため、ビード１３を設けたことにより得られる初期ピーク荷重を低く抑える性能を阻害することはない。   Next, when the buckling deformation at the foremost bead 13 progresses to some extent, the buckling deformation occurs at the flat surface portion 12c behind the bead 13, but since the bead 13 is convex, the flat surface portion 12c. Begins to deform so as to bend inward under the buckling deformation of the bead 13 (see FIG. 3). At this time, the other end of the support member 14 is spaced from the facing inner surface portion 12b and does not hinder the bending buckling deformation of the flat surface portion 12c. Therefore, the initial peak load obtained by providing the bead 13 is reduced. It does not hinder the performance of keeping it low.

平面部１２ｃが内側に向かって折れ、その平面部１２ｃでの折れ座屈変形がある程度進展すると、突支い部材１４とその突支い部材１４が固着されていない対面の内面部１２ｂとの間に設けられた隙間Ｃが徐々に狭くなり、そして突支い部材１４と上記対面の内面部１２ｂとが接触する。このとき、突支い部材１４が衝撃吸収部材１１の内面で挟み込まれて突支い棒のように作用するので、平面部１２ｃでの折れ座屈変形が制限され、大きな抵抗が生じる。この抵抗により、従来の構造では平面部１２ｃが折れ座屈変形する際に衝撃吸収部材１１の断面積或いは断面係数が低下して衝撃エネルギ吸収量が低下するところ、本実施形態では衝撃吸収部材１１の断面積或いは断面係数の低下が制限されるので衝撃エネルギ吸収量を高く維持したまま衝撃吸収部材１１の座屈変形が進展していく。   When the flat surface portion 12c is bent inward and bending buckling deformation at the flat surface portion 12c progresses to some extent, the space between the protruding member 14 and the inner surface portion 12b of the opposite surface to which the protruding member 14 is not fixed. The gap C provided on the surface gradually decreases, and the projecting member 14 and the inner surface portion 12b facing each other come into contact with each other. At this time, since the projecting member 14 is sandwiched between the inner surfaces of the shock absorbing member 11 and acts like a projecting bar, the bending buckling deformation at the plane portion 12c is limited, and a large resistance is generated. With this resistance, when the flat surface portion 12c is bent and buckled and deformed in the conventional structure, the cross-sectional area or cross-section coefficient of the shock absorbing member 11 is reduced to reduce the shock energy absorption amount. In this embodiment, the shock absorbing member 11 is reduced. Therefore, the buckling deformation of the shock absorbing member 11 progresses while maintaining a high shock energy absorption amount.

このようにして衝撃吸収部材１１における最も前方側のビード１３及び平面部１２ｃがある程度潰れたならば、続いて、衝撃吸収部材１１における最も前方側のビード１３の後方のビード１３及び平面部１２ｃが順次座屈変形し潰れていく。このとき、次の突支い部材１４が平面部１２ｃでの座屈変形に対して抵抗として作用し、平面部１２ｃでの座屈変形の変形量を制限する。衝撃吸収部材１１全体としては、最も前方側のビード１３を基点として順次後方に向かい座屈変形し潰されていく。   If the foremost bead 13 and the flat portion 12c in the shock absorbing member 11 are crushed to some extent in this way, then the bead 13 and the flat portion 12c behind the foremost bead 13 in the shock absorbing member 11 are subsequently Sequentially buckled and crushed. At this time, the next projecting support member 14 acts as a resistance against the buckling deformation in the flat surface portion 12c, and limits the deformation amount of the buckling deformation in the flat surface portion 12c. The shock absorbing member 11 as a whole is buckled and crushed sequentially toward the rear starting from the frontmost bead 13.

本実施形態に係る衝撃吸収構造１０についてシミュレーションを行った結果を図４に示す。図４に示す荷重−ストローク線図において、縦軸が荷重（衝撃荷重）であり、横軸がストローク（つぶれ量）であり、曲線と横軸で囲まれた部分の面積が衝撃エネルギ吸収量に相当する。また、図４中、実線が突支い部材を設けた衝撃吸収部材（本実施形態）について示し、破線が突支い部材を設けていない衝撃吸収部材について示す。なお、シミュレーションではビード（座屈変形用ビード）を衝撃吸収部材の長手方向に間隔を隔てて三つ設け、それらビード間にそれぞれ突支い部材を設けている。シミュレーションの結果、本実施形態では、初期ピーク荷重は突支い部材を設けていない衝撃吸収部材と同じであり、有効ストローク範囲Ｅ内での衝撃エネルギ吸収量を突支い部材を設けていない衝撃吸収部材と比較して高く維持することができることが分かった。   The result of having performed simulation about the shock absorption structure 10 which concerns on this embodiment is shown in FIG. In the load-stroke diagram shown in FIG. 4, the vertical axis is the load (impact load), the horizontal axis is the stroke (crush amount), and the area surrounded by the curve and the horizontal axis is the impact energy absorption amount. Equivalent to. Further, in FIG. 4, the solid line indicates the shock absorbing member (this embodiment) provided with the protruding member, and the broken line indicates the shock absorbing member not provided with the protruding member. In the simulation, three beads (buckling deformation beads) are provided at intervals in the longitudinal direction of the impact absorbing member, and protruding members are provided between the beads. As a result of the simulation, in this embodiment, the initial peak load is the same as that of the impact absorbing member not provided with the projecting member, and the impact energy absorption amount within the effective stroke range E is not provided with the projecting member. It turned out that it can maintain high compared with an absorption member.

以上要するに、本実施形態によれば、突支い部材１４が平面部１２ｃでの座屈変形に対して抵抗として作用するので、衝撃吸収部材１１における平面部１２ｃでの折れ座屈変形に伴う衝撃エネルギ吸収量の低下を抑制することができ、総衝撃エネルギ吸収量を向上させることができる。   In short, according to the present embodiment, since the support member 14 acts as a resistance against the buckling deformation at the flat surface portion 12c, the impact due to the folding buckling deformation at the flat surface portion 12c in the shock absorbing member 11 is achieved. A decrease in the energy absorption amount can be suppressed, and the total impact energy absorption amount can be improved.

また、突支い部材１４は、一端が衝撃吸収部材１１の内面部１２ｂに固着されると共に他端が対面の内面部１２ｂと間隔を隔てているので、平面部１２ｃでの初期の座屈変形を妨げないため、ビード１３を設けたことにより得られる初期ピーク荷重を低く抑える性能を阻害することはない。   Further, since the one end of the projecting support member 14 is fixed to the inner surface portion 12b of the shock absorbing member 11, and the other end is spaced from the facing inner surface portion 12b, the initial buckling deformation at the flat surface portion 12c is performed. Therefore, the performance of keeping the initial peak load obtained by providing the beads 13 low is not hindered.

また、突支い部材１４を既存の衝撃吸収部材（クラッシュボックス）にその本体形状を変えることなく追加することにより、既存の衝撃吸収部材についても総衝撃エネルギ吸収量を向上させることができる。その際、既存の衝撃吸収部材の本体形状を変える必要がないため、設計変更に伴う車両レイアウトへの影響は発生しない。   Further, by adding the projecting member 14 to an existing shock absorbing member (crash box) without changing its main body shape, the total shock energy absorption amount of the existing shock absorbing member can be improved. At that time, since it is not necessary to change the shape of the main body of the existing shock absorbing member, there is no influence on the vehicle layout due to the design change.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態には限定されず他の様々な実施形態を採ることが可能である。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various other embodiments can be adopted.

例えば、上述の実施形態では、ビード１３が、断面略三角形状に形成されるとしたが、これには限定はされず、図５に示すように、ビード１３が断面略台形状に形成されても良く、図６に示すように、ビード１３が断面略半円形状に形成されても良い。   For example, in the above-described embodiment, the bead 13 is formed in a substantially triangular cross section. However, the present invention is not limited to this, and the bead 13 is formed in a substantially trapezoidal cross section as shown in FIG. Alternatively, as shown in FIG. 6, the bead 13 may be formed in a substantially semicircular cross section.

また、上述の実施形態では、突支い部材１４を衝撃吸収部材１１における内面部１２ｂの上下方向の略中央に設けると共に、ビード１３間の内面部１２ｂでは前後方向の略中央に設けるとしたが、これには限定はされず、平面部１２ｃでの座屈変形による変位状況に応じて、突支い部材１４を衝撃吸収部材１１の長手方向（前後方向）或いは衝撃吸収部材１１の長手方向と直交する方向（上下方向）に内面部１２ｂの面上でずらして配置しても良い。   Further, in the above-described embodiment, the projecting support member 14 is provided at the approximate center in the vertical direction of the inner surface portion 12b of the shock absorbing member 11, and the inner surface portion 12b between the beads 13 is provided at the approximate center in the front-rear direction. However, the invention is not limited to this, and depending on the displacement state due to buckling deformation in the flat surface portion 12c, the projecting support member 14 is defined as the longitudinal direction (front-rear direction) of the shock absorbing member 11 or the longitudinal direction of the shock absorbing member 11. You may arrange | position by shifting on the surface of the inner surface part 12b in the orthogonal direction (up-down direction).

また、上述の実施形態では、突支い部材１４を衝撃吸収部材１１におけるビード１３間の平面部１２ｃに一つ設けているが、これには限定はされず、衝撃吸収部材１１における平面部１２ｃでの座屈変形による変位状況或いは衝撃エネルギ吸収量に応じて、突支い部材１４を衝撃吸収部材１１におけるビード１３間の平面部１２ｃに複数設けても良い。その際、突支い部材１４を衝撃吸収部材１１の長手方向と直交する方向（上下方向）に複数設けても良い。   In the above-described embodiment, one protruding support member 14 is provided on the flat surface portion 12c between the beads 13 of the shock absorbing member 11. However, the present invention is not limited to this, and the flat surface portion 12c of the shock absorbing member 11 is not limited thereto. A plurality of support members 14 may be provided on the flat portion 12c between the beads 13 of the shock absorbing member 11 in accordance with the displacement state due to buckling deformation or the amount of shock energy absorbed. At that time, a plurality of protruding members 14 may be provided in a direction (vertical direction) orthogonal to the longitudinal direction of the shock absorbing member 11.

また、衝撃吸収部材１１の平面部１２ｃでの変位モードが不安定であり、平面部１２ｃがある程度座屈変形しても突支い部材１４が対面の内面部１２ｂにうまくかからず荷重を受けられない場合には、図７に示すように、衝撃吸収部材１１の内面部１２ｂに、突支い部材１４の他端が重合するように形成され、突支い部材１４の他端を衝撃吸収部材１１の長手方向と直交する方向にガイドするためのガイド部材１７を設けても良い。図示例では、ガイド部材１７は、円形管（パイプ）からなり、一端が突支い部材１４の他端が対面する内面部１２ｂに溶接、リベット或いはボルト・ナット等により固着されると共に、他端が突支い部材１４の外周と固着も接触もせず所定間隔を隔てている。   Further, the displacement mode at the flat surface portion 12c of the shock absorbing member 11 is unstable, and even if the flat surface portion 12c is buckled and deformed to some extent, the projecting member 14 does not apply well to the facing inner surface portion 12b and receives a load. If not, as shown in FIG. 7, the other end of the projecting member 14 is formed on the inner surface 12 b of the impact absorbing member 11 such that the other end of the projecting member 14 is absorbed. A guide member 17 for guiding in a direction orthogonal to the longitudinal direction of the member 11 may be provided. In the illustrated example, the guide member 17 is a circular pipe (pipe), one end of which is fixed to the inner surface portion 12b facing the other end of the support member 14 by welding, rivets or bolts and nuts, and the other end. However, it does not adhere to or contact the outer periphery of the support member 14 and is spaced a predetermined distance apart.

また、図８に示すように、突支い部材１４の他端に、衝撃吸収部材１１の内面部１２ｂに対向するように形成され、衝撃吸収部材１１の他端を覆うと共にその他端よりも大きな面積の板状部材１８を装着しても良い。板状部材１８は、突支い部材１４の他端に溶接、リベット或いはボルト・ナット等により固着される。   Further, as shown in FIG. 8, the other end of the projecting support member 14 is formed so as to face the inner surface portion 12b of the shock absorbing member 11, covers the other end of the shock absorbing member 11, and is larger than the other end. A plate-like member 18 having an area may be mounted. The plate-like member 18 is fixed to the other end of the projecting support member 14 by welding, rivets or bolts / nuts.

図７及び図８のようにすることで、衝撃吸収部材１１の平面部１２ｃでの変位モードが不安定であっても、平面部１２ｃがある程度座屈変形すると突支い部材１４が対面の内面部１２ｂにうまくかかり荷重を受けられるので、突支い部材１４によって衝撃吸収部材１１の座屈変形の変形量を確実に制限することが可能となる。   7 and 8, even if the displacement mode at the flat surface portion 12c of the shock absorbing member 11 is unstable, if the flat surface portion 12c is buckled and deformed to some extent, the projecting member 14 faces the inner surface of the facing surface. Since the load can be applied to the portion 12b and the load can be received, the amount of buckling deformation of the shock absorbing member 11 can be surely limited by the projecting support member 14.

また、上述の実施形態では、衝撃吸収部材１１を、車両用車枠のサイドメンバに一体に設けるとしたが、これには限定はされず、衝撃吸収部材１１を、車両用車枠のサイドメンバとは別体で形成して、サイドメンバに溶接、リベット或いはボルト・ナット等により取り付けるようにしても良い。   In the above-described embodiment, the shock absorbing member 11 is integrally provided on the side member of the vehicle frame. However, the present invention is not limited to this, and the shock absorbing member 11 is the side member of the vehicle frame. It may be formed as a separate body and attached to the side member by welding, rivets or bolts / nuts.

さらに、上述の実施形態では、衝撃吸収部材１１を、車両用車枠のサイドメンバの前端部に設けるとしたが、これには限定はされず、衝撃吸収部材１１を、車両用車枠のサイドメンバの後端部に設けても良い。   Further, in the above-described embodiment, the shock absorbing member 11 is provided at the front end portion of the side member of the vehicle frame. However, the present invention is not limited to this, and the shock absorbing member 11 is provided on the side member of the vehicle frame. You may provide in a rear-end part.

図１は本発明の一実施形態に係る衝撃吸収構造の斜視図である。FIG. 1 is a perspective view of an impact absorbing structure according to an embodiment of the present invention. 図２（ａ）は図１の実施形態に係る衝撃吸収部材の横断面図であり、図２（ｂ）は図２（ａ）の１１ｂ−１１ｂ線矢視図である。2A is a cross-sectional view of the shock absorbing member according to the embodiment of FIG. 1, and FIG. 2B is a view taken along the line 11b-11b in FIG. 2A. 図３は衝撃吸収部材の平面部での折れ座屈変形を説明するための図である。FIG. 3 is a diagram for explaining bending buckling deformation at the flat surface portion of the shock absorbing member. 図４は荷重−ストローク線図である。FIG. 4 is a load-stroke diagram. 図５は変形例に係る衝撃吸収部材の横断面図である。FIG. 5 is a cross-sectional view of a shock absorbing member according to a modification. 図６は変形例に係る衝撃吸収部材の横断面図である。FIG. 6 is a cross-sectional view of an impact absorbing member according to a modification. 図７は変形例に係る衝撃吸収部材の横断面図である。FIG. 7 is a cross-sectional view of a shock absorbing member according to a modification. 図８は変形例に係る衝撃吸収部材の横断面図である。FIG. 8 is a cross-sectional view of an impact absorbing member according to a modification.

符号の説明Explanation of symbols

１０ 衝撃吸収構造
１１ 衝撃吸収部材
１２ａ 外面部
１２ｂ 内面部
１２ｃ 平面部
１３ ビード
１４ 突支い部材
１５ 溝形部材
１６ 溝形部材
１７ ガイド部材
１８ 板状部材 DESCRIPTION OF SYMBOLS 10 Shock-absorbing structure 11 Shock-absorbing member 12a Outer surface part 12b Inner surface part 12c Plane part 13 Bead 14 Protruding member 15 Channel member 16 Channel member 17 Guide member 18 Plate member

Claims (5)

車両用車枠の前後方向に延出する角筒状の衝撃吸収部材を備えた車両用車枠の衝撃吸収構造であって、上記衝撃吸収部材の外面部に上記衝撃吸収部材の長手方向に間隔を隔てて複数設けられ、上記衝撃吸収部材の長手方向と直交する方向に形成され、上記衝撃吸収部材を座屈変形させるための凸状のビードと、それら複数のビード間の上記衝撃吸収部材の内面部に上記衝撃吸収部材の長手方向と直交する方向に配置され、一端が上記衝撃吸収部材の内面部に固着されると共に他端が対面の内面部と間隔を隔てており、上記ビードを基点として起こる上記衝撃吸収部材の座屈変形の変形量を制限するための突支い部材とを備えたことを特徴とする車両用車枠の衝撃吸収構造。   A shock absorbing structure for a vehicle vehicle frame having a rectangular tube-shaped shock absorbing member extending in the front-rear direction of the vehicle vehicle frame, the space between the outer surfaces of the shock absorbing member being spaced in the longitudinal direction of the shock absorbing member. A plurality of convex beads for buckling deformation of the shock absorbing member and an inner surface portion of the shock absorbing member between the plurality of beads. Is arranged in a direction perpendicular to the longitudinal direction of the shock absorbing member, one end is fixed to the inner surface portion of the shock absorbing member and the other end is spaced from the inner surface portion of the facing surface, and occurs with the bead as a base point. A shock absorbing structure for a vehicle frame, comprising: a projecting support member for limiting a deformation amount of buckling deformation of the shock absorbing member. 上記衝撃吸収部材の内面部に、上記突支い部材の上記他端が対向する部分に位置させて、上記突支い部材の上記他端が重合するように形成され、その他端を上記衝撃吸収部材の長手方向と直交する方向にガイドするためのガイド部材を設けた請求項１に記載の車両用車枠の衝撃吸収構造。   The other end of the projecting support member is formed on the inner surface of the impact absorbing member so that the other end of the projecting support member is opposed to the other end of the projecting support member. The shock absorbing structure for a vehicle frame according to claim 1, further comprising a guide member for guiding in a direction orthogonal to the longitudinal direction of the member. 上記突支い部材の上記他端に、上記衝撃吸収部材の内面部に対向するように形成された板状部材を装着した請求項１又は２に記載の車両用車枠の衝撃吸収構造。   The shock absorbing structure for a vehicle frame according to claim 1 or 2, wherein a plate-like member formed so as to face the inner surface of the shock absorbing member is attached to the other end of the projecting support member. 上記突支い部材は、上記衝撃吸収部材の長手方向に間隔を隔てて複数設けられる請求項１から３いずれかに記載の車両用車枠の衝撃吸収構造。   4. The shock absorbing structure for a vehicle frame according to claim 1, wherein a plurality of the projecting support members are provided at intervals in the longitudinal direction of the shock absorbing member. 5. 上記衝撃吸収部材は、一対の溝形部材を向かい合わせて接合してなる請求項１から４いずれかに記載の車両用車枠の衝撃吸収構造。   The shock absorbing structure for a vehicle frame according to any one of claims 1 to 4, wherein the shock absorbing member is formed by joining a pair of groove members facing each other.
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