JP7226271B2 - Vehicle shock absorbing member - Google Patents

Description

本発明は、木材と、木材よりも硬い一対の拘束部材とを備え、一対の拘束部材が、木材を挟み付けた状態で連結部にて部分的に連結されている車両の衝撃吸収部材に関する。 TECHNICAL FIELD The present invention relates to an impact absorbing member for a vehicle, which includes wood and a pair of restraining members harder than the wood, wherein the pair of restraining members are partially connected at a connecting portion while sandwiching the wood.

この種の車両の衝撃吸収部材として、特許文献１に開示された車両の衝撃吸収部材が公知である。この衝撃吸収部材４Ｘは、図１４に示すように車両前後方向に長尺な柱形状の部材であり、車両の車幅方向における右側部２ｃＸに配設されている。そして衝撃吸収部材４Ｘは、木材６Ｘと、一対の拘束部材１０Ｘ，１２Ｘと、拘束部材同士を連結する複数の連結部ＢＭとを有している。木材６Ｘは、車両前後方向に長尺な柱状又は板状に形成されており、年輪の軸心方向が荷重の入力方向に沿うように車両の右側部２ｃＸに配設されている。そして木材６Ｘの長辺をなす一つの側端面（図１４の右側面）は、荷重の入力される入力端部となって車両の外側を向いた状態で配置されている。また一対の拘束部材１０Ｘ，１２Ｘは、それぞれ木材６Ｘよりも硬い金属板であり、木材６Ｘを上下から挟み付けるように配置されている。これら各拘束部材１０Ｘ，１２Ｘの前側と後側は、両拘束部材１０Ｘ，１２Ｘと木材６Ｘに挿通されたボルト状の連結部ＢＭで連結されている。そして図１５に示すように、車両側突時に車両が受けた衝撃荷重Ｆを、木材６Ｘが荷重入力方向（図１５で車両内側となる左方）に向けて圧壊することにより吸収する。 As a vehicle shock absorbing member of this type, a vehicle shock absorbing member disclosed in Patent Document 1 is known. As shown in FIG. 14, the impact absorbing member 4X is a column-shaped member elongated in the vehicle front-rear direction, and is disposed on the right side portion 2cX of the vehicle in the vehicle width direction. The shock absorbing member 4X has a wooden piece 6X, a pair of restraining members 10X and 12X, and a plurality of connecting portions BM that connect the restraining members. The wood 6X is formed in the shape of a column or plate elongated in the longitudinal direction of the vehicle, and is arranged on the right side 2cX of the vehicle so that the axial direction of annual rings is along the direction of load input. One side end face (the right side face in FIG. 14) forming the long side of the wooden piece 6X is arranged in a state facing the outside of the vehicle as an input end to which a load is input. The pair of restraining members 10X and 12X are metal plates harder than the wood 6X, and are arranged to sandwich the wood 6X from above and below. The front and rear sides of each of these restraining members 10X and 12X are connected by a bolt-shaped connecting portion BM which is inserted through both of the restraining members 10X and 12X and the wood 6X. Then, as shown in FIG. 15, the wood 6X absorbs the impact load F received by the vehicle at the time of the vehicle side collision by crushing it in the load input direction (the left side, which is the inside of the vehicle in FIG. 15).

ここで図１４及び図１５に示す衝撃吸収部材４Ｘでは、荷重入力時において木材６Ｘに亀裂が生じた場合においても、効率的な衝撃吸収性能を有していることが望まれる。このため特許文献１に開示の技術では、各拘束部材１０Ｘ，１２Ｘにて、亀裂が生じた木材６Ｘを極力割裂しないように拘束しておくことで、その効率的な衝撃吸収性能を確保している。さらに同技術では、入力端部側となる右側において、各拘束部材１０Ｘ，１２Ｘを前後の各連結部ＢＭで部分的に連結し、連結部間の各拘束部材１０Ｘ，１２Ｘ（図１４の符号５０Ｘで示す部分）で木材６Ｘを適度に拘束している。このような構成であると、連結部間に衝撃荷重Ｆが入力された際に、木材６Ｘのスムーズな圧壊が連結部ＢＭで過度に邪魔されるといった事態を極力回避することができる。 Here, in the impact absorbing member 4X shown in FIGS. 14 and 15, it is desired that the impact absorbing member 4X has efficient impact absorbing performance even when cracks occur in the wood 6X when a load is input. For this reason, in the technique disclosed in Patent Document 1, efficient impact absorption performance is ensured by restraining the cracked wood 6X with the restraining members 10X and 12X so as not to split it as much as possible. there is Furthermore, in this technique, on the right side, which is the input end side, the restraining members 10X and 12X are partially connected by the front and rear connecting portions BM, and the restraining members 10X and 12X (reference numeral 50X in FIG. 14) between the connecting portions are partially connected. ) moderately constrains the timber 6X. With such a configuration, when the impact load F is input between the connecting portions, it is possible to avoid a situation in which smooth crushing of the wood 6X is excessively hindered by the connecting portions BM.

特開２０１９‐８９４８４号公報JP 2019-89484 A

ところでこの種の衝撃吸収部材では、衝撃荷重を受けた各拘束部材を、荷重入力方向に（適切な向きに）塑性変形させて、木材の圧壊に応じた座屈状態とすることが望ましい。例えば図１５に示す公知技術の各拘束部材１０Ｘ，１２Ｘは、連結部ＢＭの連結力によって木材６Ｘから離れる向きへの変形（図１５の破線で示す変形）が極力阻止され、荷重入力方向に変形しやすい構成となっている。そしてこのような構成では、各拘束部材１０Ｘ，１２Ｘに対して、その適切な向きへの変形と、木材６Ｘの適度な拘束の両立が求められることがある。すなわち上述の構成では、一対の連結部ＢＭの間の各拘束部材（５０Ｘ）において、木材６Ｘを適度に拘束した状態とし、そのうえで当該拘束部材の適切な向きへの変形を促すことが求められる。本発明は上述の点に鑑みて創案されたものであり、本発明が解決しようとする課題は、木材のスムーズな圧壊を確保しつつ、連結部間の拘束部材の適切な向きへの変形を促すことにある。 By the way, in this type of impact absorbing member, it is desirable to plastically deform each restraining member that has received an impact load (in an appropriate direction) in the load input direction so as to be in a buckling state according to the crushing of the wood. For example, each of the well-known restraining members 10X and 12X shown in FIG. 15 is prevented from being deformed away from the wood 6X (deformation indicated by the dashed line in FIG. 15) by the connecting force of the connecting portion BM as much as possible, and is deformed in the load input direction. It has an easy configuration. In such a configuration, the restraining members 10X and 12X are required to be deformed in an appropriate direction and to appropriately restrain the wood 6X. That is, in the above-described configuration, it is required that the wood 6X is appropriately restrained in each of the restraining members (50X) between the pair of connecting portions BM, and then the restraining member is encouraged to deform in an appropriate direction. The present invention has been devised in view of the above points, and the problem to be solved by the present invention is to ensure smooth crushing of the lumber and to prevent the deformation of the restraining member between the joints in an appropriate direction. to encourage.

上記課題を解決するための手段として、第１発明の車両の衝撃吸収部材は、木材と、木材よりも硬い一対の拘束部材と、一対の拘束部材同士を連結し且つ各拘束部材を木材に取付けている連結部とを備えている。そして木材は、年輪の軸心方向が荷重の入力方向に沿うように配置されるとともに、荷重入力側に位置する入力端部を有している。また一対の拘束部材は、木材の入力端部側における平面視において、木材の入力端部を挟み付けるように対向して配置された状態で、両拘束部材の間に橋渡された一対の連結部で連結されている。そして本発明では、一対の連結部が、平面視において橋渡し方向と直交する方向に離間して配置されることで、一対の連結部の間に位置する各拘束部材に、連結部にて連結されていない非連結領域が形成されている。この種の構成では、木材のスムーズな圧壊を確保しつつ、連結部間の拘束部材の適切な向きへの変形を促すことが望ましい。 As a means for solving the above-mentioned problems, a shock absorbing member for a vehicle according to a first aspect of the present invention comprises wood, a pair of restraining members harder than the wood, and a pair of restraining members that are connected to each other and attached to the wood. and a connecting portion. The lumber is arranged so that the axial direction of annual rings is along the direction of load input, and has an input end located on the load input side. In addition, the pair of restraining members are arranged in a state of facing each other so as to sandwich the input end of the lumber in a plan view on the input end side of the lumber, and a pair of connecting portions bridged between the restraining members. are connected by Further, in the present invention, the pair of connecting portions are arranged apart in a direction perpendicular to the bridging direction in a plan view, so that each restraining member positioned between the pair of connecting portions is connected by the connecting portion. A non-connected region is formed. In this type of configuration, it is desirable to facilitate deformation of the restraining member between the joints in an appropriate orientation while ensuring smooth crushing of the wood.

そこで本発明の非連結領域には、荷重入力の際に木材から離れる外側への変形を規制するように拘束部材を補強してその荷重入力方向への塑性変形を促す補強部が設けられており、荷重の入力方向において入力端部からその反対側の端部までの距離を基準距離として、入力端部から基準距離の１／３離れた位置までの領域を入力端部側の領域とした場合、補強部は、入力端部側の領域のみに設けられている。本発明では、各拘束部材に非連結領域を設けることにより、木材を、そのスムーズな圧壊変形を確保できるように適度に拘束している。そのうえで非連結領域に設けられた補強部によって、各拘束部材の外側への変形を規制して荷重入力方向への塑性変形を促すことにより、優れた衝撃吸収性の確保に資する構成となっている。
Therefore, in the non-connected region of the present invention, a reinforcing portion is provided to reinforce the restraining member so as to restrict deformation to the outside away from the wood when a load is input, and promote plastic deformation in the direction of load input. , When the distance from the input end to the opposite end in the direction of load input is the reference distance, and the area from the input end to the position 1/3 of the reference distance is defined as the input end side area , the reinforcing portion is provided only in the region on the input end side . In the present invention, by providing each restraining member with a non-connecting region, the wood is appropriately restrained so as to ensure smooth crushing deformation. On top of that, the reinforcing portion provided in the non-connecting region restricts outward deformation of each restraining member and promotes plastic deformation in the load input direction, thereby contributing to ensuring excellent shock absorption. .

第２発明の車両の衝撃吸収部材は、第１発明の車両の衝撃吸収部材において、各拘束部材は、各々、木材を臨む内側面と、内側面とは反対の外側面とを有し、補強部は、内側面と外側面の少なくとも一方から突出している。本発明では、補強部が、拘束部材の対応する面を補強するリブ又は桟として機能することで、各拘束部材の外側への変形をより確実に規制することができる。 The vehicle shock absorbing member of the second invention is the vehicle shock absorbing member of the first invention, wherein each restraining member has an inner surface facing the wood and an outer surface opposite to the inner surface, and is reinforced. The portion protrudes from at least one of the inner surface and the outer surface. In the present invention, the reinforcing portion functions as a rib or cross piece that reinforces the corresponding surface of the restraining member, so that outward deformation of each restraining member can be more reliably restricted.

第３発明の車両の衝撃吸収部材は、第２発明の車両の衝撃吸収部材において、補強部は、内側面と外側面の少なくとも一方を部分的に***させるように各拘束部材を突出方向に曲げ形成してなる部位である。本発明の補強部は、各拘束部材の対応する面を部分的に***させるように屈曲又は湾曲した部分であり、荷重入力方向に潰れるように塑性変形することが可能となっている。このため本発明では、補強部を起点として、非連結領域の各拘束部材の荷重入力方向への変形をより確実に促すことが可能となっている。 A vehicle impact absorbing member according to a third aspect of the invention is the vehicle impact absorbing member according to the second aspect of the invention, wherein the reinforcing portion bends each of the restraining members in a projecting direction so as to partially bulge at least one of the inner surface and the outer surface. It is a part formed. The reinforcing portion of the present invention is a bent or curved portion that partially bulges the corresponding surface of each restraint member, and is capable of plastic deformation so as to be crushed in the load input direction. Therefore, in the present invention, it is possible to more reliably promote the deformation of each restraint member in the non-connected region in the load input direction, starting from the reinforcing portion.

第４発明の車両の衝撃吸収部材は、第１発明～第３発明のいずれかの車両の衝撃吸収部材において、補強部は、一対の連結部の一方から他方に向けて連続的に形成されている。本発明では、補強部を、非連結領域を概ね網羅するように一対の連結部の間に連続的に形成することで、各拘束部材の外側への変形をより広範囲に渡って規制することができる。 A vehicle shock absorbing member of a fourth invention is the vehicle shock absorbing member of any one of the first to third inventions, wherein the reinforcing portion is continuously formed from one of the pair of connecting portions toward the other. there is In the present invention, by forming the reinforcing portion continuously between the pair of connecting portions so as to substantially cover the non-connecting region, it is possible to restrict the outward deformation of each restraining member over a wider range. can.

第５発明の車両の衝撃吸収部材は、第１発明～第４発明のいずれかの車両の衝撃吸収部材において、衝撃吸収部材の外形が所定の方向に長尺な柱形状又は板形状とされており、一対の拘束部材は、長尺方向における各端側に位置する各連結部にて連結されている。本発明では、衝撃吸収部材の長尺方向における両端側に連結部をそれぞれ設け、非連結領域を相対的に大きくすることにより、木材を、そのスムーズな圧壊変形を確保できるように適度に拘束している。そしてこのような場合においても、非連結領域に設けられた補強部によって各拘束部材の荷重入力方向への変形を促すことができる。 A vehicle shock absorbing member according to a fifth invention is the vehicle shock absorbing member according to any one of the first to fourth inventions, wherein the external shape of the shock absorbing member is a column shape or a plate shape elongated in a predetermined direction. The pair of restraint members are connected at respective connecting portions located at respective ends in the longitudinal direction. In the present invention, connecting portions are provided at both ends of the impact absorbing member in the longitudinal direction, and the non-connecting regions are relatively enlarged, thereby appropriately restraining the lumber so as to ensure smooth crushing deformation. ing. Also in such a case, the reinforcing portion provided in the non-connecting region can promote the deformation of each restraining member in the load input direction.

本発明に係る第１発明によれば、木材のスムーズな圧壊を確保しつつ、連結部間の拘束部材の適切な向きへの変形を促すことができる。また第２発明によれば、連結部間の拘束部材の適切な向きへの変形をより確実に促すことができる。また第３発明によれば、連結部間の拘束部材の適切な向きへの変形を更に確実に促すことができる。また第４発明によれば、連結部間の拘束部材の適切な向きへの変形をより広範囲に渡って促すことができる。そして第５発明によれば、木材のスムーズな圧壊をより確実に確保しつつ、連結部間の拘束部材の適切な向きへの変形を促すことができる。 According to the first aspect of the present invention, it is possible to promote deformation in an appropriate direction of the restraining member between the connecting portions while ensuring smooth crushing of the lumber. Moreover, according to the second invention, it is possible to more reliably promote the deformation of the restraining member between the connecting portions in an appropriate direction. Further, according to the third invention, it is possible to further reliably promote the deformation of the restraining member between the connecting portions in an appropriate direction. Further, according to the fourth invention, it is possible to encourage the deformation of the restraining member between the connecting portions in a suitable direction over a wider range. According to the fifth invention, it is possible to promote the deformation of the restraining member between the connecting portions in an appropriate direction while ensuring smooth crushing of the lumber more reliably.

車両と衝撃吸収部材の概略上面図である。FIG. 2 is a schematic top view of the vehicle and the impact absorbing member; 衝撃吸収部材の斜視図である。It is a perspective view of a shock-absorbing member. 衝撃吸収部材を木材の入力端部側から見た平面図である。FIG. 4 is a plan view of the shock absorbing member viewed from the input end side of the wood; 図３のＩＶ－ＩＶ線断面に相当する概略断面図である。4 is a schematic cross-sectional view corresponding to the IV-IV line cross section of FIG. 3; FIG. 図３のＶ－Ｖ線断面に相当する概略断面図である。4 is a schematic cross-sectional view corresponding to the VV line cross-section of FIG. 3; FIG. 補強部を示す衝撃吸収部材の拡大斜視図である。FIG. 4 is an enlarged perspective view of the shock absorbing member showing a reinforcing portion; 荷重入力時の衝撃吸収部材の概略上面図である。FIG. 4 is a schematic top view of the shock absorbing member when a load is applied; 荷重入力時の衝撃吸収部材の概略断面図である。4 is a schematic cross-sectional view of the shock absorbing member when a load is applied; FIG. 変形例１の衝撃吸収部材の断面図である。FIG. 5 is a cross-sectional view of a shock absorbing member of Modification 1; 変形例２の衝撃吸収部材の断面図である。FIG. 11 is a cross-sectional view of a shock absorbing member of modification 2; 変形例３の衝撃吸収部材の斜視図である。FIG. 11 is a perspective view of a shock absorbing member of Modified Example 3; 実施形態２の衝撃吸収部材の斜視図である。FIG. 10 is a perspective view of a shock absorbing member of Embodiment 2; 図１２のＸＩＩＩ－ＸＩＩＩ線断面に相当する概略断面図である。13 is a schematic cross-sectional view corresponding to the XIII-XIII line cross section of FIG. 12; FIG. 従来の衝撃吸収部材の斜視図である。FIG. 10 is a perspective view of a conventional shock absorbing member; 従来の衝撃吸収部材の概略断面図である。1 is a schematic cross-sectional view of a conventional shock absorbing member; FIG.

以下、本発明を実施するための形態を、図１～図１３を参照して説明する。図１では、車両の前後方向と左右方向を示す矢線を図示する。また図２～図１３では、衝撃吸収部材が図１に示す車両に取付けられている状態を基準として、衝撃吸収部材の前後方向と左右方向と上下方向を示す矢線を適宜図示する。なお図４、図５、図８及び図１３では、便宜上、各拘束部材の厚み寸法（板厚）を誇張して図示する。そして各図には、木材の年輪の軸心方向を示す矢線（符号Ａ）と、衝撃荷重の荷重入力方向を示す矢線（符号Ｆ）を適宜図示することがある。 A mode for carrying out the present invention will be described below with reference to FIGS. 1 to 13. FIG. In FIG. 1, arrows indicating the front-rear direction and the left-right direction of the vehicle are illustrated. In FIGS. 2 to 13, arrows indicating the front-rear direction, the left-right direction, and the up-down direction of the shock absorbing member are appropriately illustrated with reference to the state in which the shock absorbing member is attached to the vehicle shown in FIG. 4, 5, 8 and 13, the thickness dimension (plate thickness) of each restraining member is exaggerated for the sake of convenience. In each figure, an arrow (symbol A) indicating the axial direction of tree rings and an arrow (symbol F) indicating the load input direction of the impact load may be illustrated as appropriate.

［衝撃吸収部材］
図１に示す車両２では、後述する適宜の位置に衝撃吸収部材４が配設され、車両衝突時などに車両が受けた衝撃荷重（以下、単に荷重Ｆと呼ぶ）を吸収することが可能となっている。そして衝撃吸収部材４は、図２及び図５に示すように、木材６と、一対の拘束部材１０，１２と、複数の連結部２１～２４と、一対の補強部３１，３２を有している（各構成の詳細は後述）。この衝撃吸収部材４では、車両２が受けた荷重Ｆを、木材６が荷重入力方向である左方に向けて圧壊することで吸収する。また一対の拘束部材１０，１２は、木材６を上下から挟み付けて拘束しつつ、これらの前端側と後端側に位置する連結部２１～２４で部分的に連結されている。 [Impact absorbing member]
In the vehicle 2 shown in FIG. 1, an impact absorbing member 4 is disposed at an appropriate position, which will be described later, and is capable of absorbing an impact load (hereinafter simply referred to as load F) received by the vehicle at the time of a vehicle collision or the like. It's becoming 2 and 5, the shock absorbing member 4 has a wooden piece 6, a pair of restraining members 10 and 12, a plurality of connecting portions 21 to 24, and a pair of reinforcing portions 31 and 32. (details of each configuration will be described later). The impact absorbing member 4 absorbs the load F received by the vehicle 2 by crushing the wood 6 toward the left in the load input direction. The pair of restraining members 10 and 12 sandwich and restrain the wood 6 from above and below, and are partially connected by connecting portions 21 to 24 located on the front end side and the rear end side.

そして図２に示す衝撃吸収部材４では、荷重Ｆが入力された各拘束部材１０，１２を、荷重入力方向に（適切な向きに）塑性変形させて、木材６の圧壊に応じた座屈状態とすることが望ましい。このため本実施形態では、後述するように各拘束部材１０，１２の適切な向きへの塑性変形を促すのであるが、この種の構成では、連結部（２１，２２等）間の各拘束部材１０，１２を、木材６を適度に拘束した状態で維持しつつ、そのうえで適切な向きへの変形を促すことが望ましい。そこで本実施形態では、後述する各補強部３１，３２によって、木材６のスムーズな圧壊を確保しつつ、連結部間の拘束部材１０，１２の適切な向きへの変形を促すこととした。以下、各構成について詳述する。 In the impact absorbing member 4 shown in FIG. 2, each of the restraining members 10 and 12 to which the load F is input is plastically deformed in the load input direction (in an appropriate direction), and the buckling state corresponding to the crushing of the wood 6 is achieved. It is desirable to For this reason, in this embodiment, as will be described later, plastic deformation of each of the restraining members 10 and 12 in an appropriate direction is promoted. It is desirable to maintain 10 and 12 in a state in which the wood 6 is appropriately restrained, while promoting deformation in an appropriate direction. Therefore, in the present embodiment, reinforcing portions 31 and 32, which will be described later, promote deformation of the binding members 10 and 12 between the connecting portions in appropriate directions while ensuring smooth crushing of the wood 6. FIG. Each configuration will be described in detail below.

［車両に対する衝撃吸収部材の配設位置］
ここで図１の車両２に対する衝撃吸収部材４の配設位置は、荷重Ｆの入力が想定される車両２の適宜の位置に設定できる。例えば車両２は、車両の前後方向に対向している前部２ａ及び後部２ｂと、車幅方向である左右方向に対向している右側部２ｃ及び左側部２ｄとを有している。そして衝撃吸収部材４は、車両２の各部２ａ～２ｄの適宜の位置に配設することが可能であり、必要に応じて車両２の内部に配設することもできる。例えば本実施形態では、車両側突時の荷重Ｆを衝撃吸収部材４で吸収する場合を想定し、衝撃吸収部材４を車両２の右側部２ｃと左側部２ｄに配設しておく（図１では、便宜上、右側部の衝撃吸収部材のみ図示する）。そして車両２の右側部２ｃ等には、車両ボディの一部をなす金属製のボディ３が配置されており、このボディ３の右側に衝撃吸収部材４が取付けられている。なお車両２に対する衝撃吸収部材４の取付け手法は特に限定しないが、典型的には締結や溶接などの手法を例示できる。例えば本実施形態では、衝撃吸収部材４の周縁側に図示しないボルト材を挿設するとともに、これらボルト材を介して衝撃吸収部材４をボディ３等に締結して取付けている。 [Arrangement position of the shock absorbing member with respect to the vehicle]
Here, the arrangement position of the shock absorbing member 4 with respect to the vehicle 2 in FIG. For example, the vehicle 2 has a front portion 2a and a rear portion 2b facing each other in the front-rear direction of the vehicle, and a right portion 2c and a left portion 2d facing each other in the left-right direction, which is the width direction of the vehicle. The impact absorbing member 4 can be arranged at appropriate positions in each portion 2a to 2d of the vehicle 2, and can also be arranged inside the vehicle 2 as required. For example, in the present embodiment, it is assumed that the load F at the time of a vehicle side collision is absorbed by the impact absorbing member 4, and the impact absorbing member 4 is arranged on the right side 2c and the left side 2d of the vehicle 2 (see FIG. 1). For convenience, only the shock absorbing member on the right side is shown). A metal body 3 forming a part of the vehicle body is arranged on the right side 2c and the like of the vehicle 2, and an impact absorbing member 4 is attached to the right side of the body 3. As shown in FIG. The method of mounting the shock absorbing member 4 to the vehicle 2 is not particularly limited, but typical methods such as fastening and welding can be exemplified. For example, in the present embodiment, bolt members (not shown) are inserted on the peripheral edge side of the impact absorbing member 4, and the impact absorbing member 4 is fastened and attached to the body 3 or the like via these bolt members.

［木材］
木材６は、図２～図４を参照して、衝撃吸収部材４の芯部となる部材であり、車両側突時の荷重Ｆによって変形することができる。この木材６は、図１の車両２に配設された状態において、図４に示すように年輪の軸心方向Ａが荷重Ｆの入力方向（各図の左右方向）とほぼ一致するように配置されている。このため衝撃吸収部材４では、車両側突時の荷重Ｆを、木材６が年輪の軸心方向Ａに圧縮しつつ潰れる（圧壊する）ことで良好に吸収することが可能となっている。なお木材６は、スギやヒノキやマツなどの針葉樹、ケヤキやブナなどの広葉樹から採取することが可能であり、特に相対的に年輪がはっきりしている針葉樹から採取することが望ましい。 [wood]
2 to 4, the wood 6 is a core member of the impact absorbing member 4, and can be deformed by a load F at the time of a vehicle side collision. 1, the lumber 6 is arranged so that the axial direction A of annual rings substantially coincides with the input direction of the load F (horizontal direction in each figure) as shown in FIG. It is Therefore, in the impact absorbing member 4, the load F at the time of a vehicle side collision can be well absorbed by compressing (crushing) the wood 6 in the axial direction A of the tree rings. The lumber 6 can be harvested from conifers such as cedar, cypress, and pine, and from broad-leaved trees such as zelkova and beech, and is preferably harvested from conifers with relatively clear annual rings.

そして木材６は、図１～図４に示すように板形状又は柱形状に形成されており、上方視で前後方向（所定の方向）に長尺な略長方形状をなし且つ適度な上下の厚み寸法を有している。この木材６は、図３及び図４を参照して、上下方向に対向配置する上面８ａ及び下面８ｂと、周端面をなす四つの端面（右端面８ｃ，左端面８ｄ，前端面８ｅ，後端面８ｆ）を有している。ここで図３に示す木材６の前端面８ｅは、木材６の短辺をなして最も車両２の前側に配置する部分であり、後端面８ｆは、木材６の短辺をなして最も車両２の後側に配置する部分である。これら前端面８ｅと後端面８ｆの左右の長さは、木材６の左右の寸法を規定し、木材６に求められる衝撃吸収性能に応じて適宜設定可能である。そして前端面８ｅ側と後端面８ｆ側は、本発明の衝撃吸収部材４の長尺方向における各端側に相当し、後述する連結部が配設されることとなる。このため木材６の前端面８ｅ側には、図３及び図４に示すように連結部用の左右一対の貫通孔６Ｈが設けられ、木材６の後端面８ｆ側にも、連結部用の左右一対の貫通孔６Ｈが設けられている。そして連結部用の各貫通孔６Ｈは、それぞれ対応する連結部を挿通可能な径寸法を有して、木材６を上下に貫通して上面８ａと下面８ｂとに開口している。 As shown in FIGS. 1 to 4, the wood 6 is formed in a plate shape or a column shape, and has a substantially rectangular shape elongated in the front-rear direction (predetermined direction) when viewed from above, and has an appropriate vertical thickness. have dimensions. 3 and 4, the wood 6 has an upper surface 8a and a lower surface 8b that face each other in the vertical direction, and four end surfaces (a right end surface 8c, a left end surface 8d, a front end surface 8e, and a rear end surface) forming peripheral end surfaces. 8f). Here, the front end face 8e of the timber 6 shown in FIG. This is the part to be placed on the rear side of the The left and right lengths of the front end surface 8e and the rear end surface 8f define the left and right dimensions of the timber 6, and can be appropriately set according to the impact absorption performance required of the timber 6. As shown in FIG. The front end surface 8e side and the rear end surface 8f side correspond to respective end sides in the longitudinal direction of the impact absorbing member 4 of the present invention, and connecting portions to be described later are arranged. For this reason, a pair of right and left through holes 6H for connecting portions are provided on the front end surface 8e side of the wood 6 as shown in FIGS. A pair of through holes 6H are provided. Each through-hole 6H for connecting portion has a diameter dimension allowing insertion of the corresponding connecting portion, penetrates the wood 6 vertically, and opens to the upper surface 8a and the lower surface 8b.

また図４に示す木材６の右端面８ｃは、木材６の長辺をなして最も車両２の外側（各図の右側）に配置する平坦な端面であるとともに、車両側突時の荷重Ｆ入力側に位置する木材６の入力端部となっている。また左端面８ｄは、木材６の長辺をなして最も車両２の内側（各図の左側）に配置する平坦な端面であるとともに、入力端部の反対に位置する木材６の基端部となっている。ここで右端面８ｃと左端面８ｄの前後の長さは、木材６の前後の寸法を規定するとともに、他の周端面８ｅ，８ｆに比して長尺とされている。そして木材６は、後述するように、その長辺をなす右端面８ｃによって、幅広い範囲で荷重Ｆを受け止めることが可能となっている。 A right end face 8c of the timber 6 shown in FIG. 4 is a flat end face that forms the long side of the timber 6 and is positioned furthest to the outside of the vehicle 2 (right side in each figure). It is the input end of the wood 6 located on the side. The left end face 8d is a flat end face that forms the long side of the wooden piece 6 and is positioned furthest inside the vehicle 2 (on the left side in each figure), and is positioned opposite to the input end portion of the wooden piece 6. It's becoming Here, the front and rear lengths of the right end face 8c and the left end face 8d define the front and rear dimensions of the lumber 6, and are longer than the other peripheral end faces 8e and 8f. As will be described later, the right end face 8c of the long side of the wood 6 can receive the load F over a wide range.

［一対の拘束部材］
一対の拘束部材（上側拘束部材１０，下側拘束部材１２）は、図２～図４を参照して、それぞれ木材６を拘束するための部材である。これら上側拘束部材１０と下側拘束部材１２は、いずれも略矩形状の板材（同形同寸）で構成されており、これらの外形は、木材６の上下の各面８ａ，８ｂの外形に概ね一致している。そして各拘束部材１０，１２は、木材６よりも硬い素材で形成されているとともに、荷重Ｆの入力によって塑性変形することができる。この種の素材として、塑性変形可能な各種の素材を用いることができ、相対的に硬く且つ強度性に優れる金属（合金を含む）を用いることができる。なお金属の種類は、塑性変形可能である限り特に限定しないが、アルミニウムや鉄や鋼やステンレスなどの各種金属を例示でき、なかでも軽量なアルミニウムを素材として用いることが望ましい。 [Pair of restraining members]
A pair of restraining members (upper restraining member 10, lower restraining member 12) are members for restraining the wood 6, respectively, with reference to FIGS. Both the upper restraining member 10 and the lower restraining member 12 are composed of substantially rectangular plate materials (same shape and size), and their outlines correspond to the outlines of the upper and lower surfaces 8a and 8b of the wood 6. They generally match. Each of the restraining members 10 and 12 is made of a material harder than the wood 6 and can be plastically deformed by the input of the load F. As this type of material, various plastically deformable materials can be used, and metals (including alloys) that are relatively hard and excellent in strength can be used. The type of metal is not particularly limited as long as it can be plastically deformed, but various metals such as aluminum, iron, steel, and stainless steel can be exemplified.

そして一対の拘束部材１０，１２は、木材６の右端面８ｃ（入力端部側）から見た図３の平面視において、木材６を上下方向から挟み付けるように対向して配置されている。この状態の上側拘束部材１０は、図４に示すように木材６の年輪の軸心方向Ａに沿って配置され、木材６の上面８ａの略全面を覆っている。そして上側拘束部材１０では、その下側の下内側面１０ａが木材６を臨むように配置されて概ね全面で接しており、その上側の上外側面１０ｂが外部に露出している。また上側拘束部材１０の右端１０ｃは、左右方向において木材６の右端面８ｃに概ね一致して配置され、上側拘束部材１０の左端１０ｄは、木材６の左端面８ｄに概ね一致して配置されている。そして上側拘束部材１０の前端側と後端側とには、各々、連結部用の複数の貫通孔１０Ｈが設けられ、各貫通孔１０Ｈは、それぞれ上側拘束部材１０を上下に貫通して木材６の対応する連結部用の貫通孔６Ｈに対面配置されている。 The pair of restraining members 10 and 12 are arranged to face each other so as to sandwich the wooden piece 6 from above and below in the plan view of FIG. The upper restraining member 10 in this state is arranged along the axial direction A of the annual rings of the wood 6 and covers substantially the entire upper surface 8a of the wood 6, as shown in FIG. In the upper restraining member 10, the lower inner side surface 10a on the lower side is arranged so as to face the wood 6 and is in contact with the wood 6 almost entirely, and the upper outer side surface 10b on the upper side is exposed to the outside. The right end 10c of the upper restraining member 10 is arranged to substantially match the right end surface 8c of the wooden piece 6 in the left-right direction, and the left end 10d of the upper restraining member 10 is arranged to substantially coincide with the left end surface 8d of the wooden piece 6. there is A plurality of through holes 10H for connecting portions are provided at the front end side and the rear end side of the upper restraining member 10, respectively. are arranged to face the through holes 6H for the corresponding connecting portions.

また図４に示す下側拘束部材１２は、木材６の年輪の軸心方向Ａに沿って配置され、木材６の下面８ｂの略全面を覆っている。この状態の下側拘束部材１２では、その上側の上内側面１２ａが木材６に接しており、その下側の下外側面１２ｂが外部に露出している。また下側拘束部材１２の右端１２ｃは、左右方向において木材６の右端面８ｃに概ね一致して配置され、下側拘束部材１２の左端１２ｄも、木材６の左端面８ｄに概ね一致して配置されている。そして下側拘束部材１２にも、木材６の連結部用の各貫通孔６Ｈと概ね同位置に連結部用の複数の貫通孔１２Ｈが設けられている。 The lower restraining member 12 shown in FIG. 4 is arranged along the axial direction A of the annual rings of the wood 6 and covers substantially the entire lower surface 8b of the wood 6. As shown in FIG. In the lower binding member 12 in this state, the upper inner side surface 12a is in contact with the wood 6, and the lower outer side surface 12b is exposed to the outside. In addition, the right end 12c of the lower restraining member 12 is arranged to substantially match the right end surface 8c of the wooden piece 6 in the left-right direction, and the left end 12d of the lower restraining member 12 is also arranged to substantially coincide with the left end surface 8d of the wooden piece 6. It is The lower restraining member 12 is also provided with a plurality of through-holes 12H for connecting portions at approximately the same positions as the through-holes 6H for connecting portions of the wood 6. As shown in FIG.

［連結部］
そして図２を参照して、一対の拘束部材１０，１２は、複数の連結部（一対の右連結部２１，２２，一対の左連結部２３，２４）を介して連結された状態で木材６に取付けられている。すなわち各連結部２１～２４は、一対の拘束部材１０，１２同士を連結するとともに、各拘束部材１０，１２を木材６に取付けている部材である。なお各連結部２１～２４の素材は、適度な強度を備えていれば特に限定しないが、典型的には拘束部材で例示の素材を用いることができる。そして各連結部２１～２４は、いずれも上下方向に長尺なボルト状の部材であり、概ね同一の基本構成を有している。例えば図４に示す前側の右連結部２１は、上下に延びる軸状の部材であって、上側の端部には相対的に径大とされた頭部ＨＭが設けられ、さらに下側の端部にはナットＮＴを螺合できる。 [Connecting part]
Then, referring to FIG. 2, the pair of restraining members 10 and 12 are connected via a plurality of connecting portions (a pair of right connecting portions 21 and 22 and a pair of left connecting portions 23 and 24). installed in the That is, each of the connecting portions 21 to 24 is a member that connects the pair of restraining members 10 and 12 and attaches each of the restraining members 10 and 12 to the wood 6. As shown in FIG. The material for each of the connecting portions 21 to 24 is not particularly limited as long as it has an appropriate strength, but typically, the materials exemplified for the restraining member can be used. Each of the connecting portions 21 to 24 is a vertically elongated bolt-like member and has substantially the same basic configuration. For example, the front right connecting portion 21 shown in FIG. 4 is a shaft-like member extending vertically, and has a head HM having a relatively large diameter at the upper end and a head HM at the lower end. A nut NT can be screwed to the part.

ここで図２に示す各連結部２１～２４の配設手法は略同一であるため、以下に、前側の右連結部２１を一例にその詳細を説明する。そして図４を参照して、一対の拘束部材１０，１２を、木材６を挟み付けるように対向配置した場合、これら部材の対応する連結部用の貫通孔６Ｈ，１０Ｈ，１２Ｈが概ね同軸上に配置される。そこで前側の右連結部２１の軸部分を、上側拘束部材１０の貫通孔１０Ｈから挿入し、当該貫通孔１０Ｈの周縁に頭部ＨＭを掛止した状態としておく。また前側の右連結部２１の軸部分は、木材６の貫通孔６Ｈを通じて下側拘束部材１２の貫通孔１２Ｈに挿通され、さらに下側拘束部材１２から突出している軸部分にナットＮＴが螺合される。こうして配設された前側の右連結部２１によって、一対の拘束部材１０，１２同士が連結され、さらに各拘束部材１０，１２が木材６に取付けられることとなる。そして同様の手法にて、図２に示すその他の連結部２２～２４を、木材６と各拘束部材１０，１２の適宜の位置に配設することができる。 Here, since the arrangement method of each of the connecting portions 21 to 24 shown in FIG. 2 is substantially the same, details thereof will be described below using the front right connecting portion 21 as an example. 4, when a pair of restraining members 10 and 12 are arranged to face each other so as to sandwich the wood 6, the through holes 6H, 10H and 12H for the corresponding connecting portions of these members are substantially coaxial. placed. Therefore, the shaft portion of the front right connecting portion 21 is inserted through the through hole 10H of the upper restraining member 10, and the head HM is hooked to the periphery of the through hole 10H. The shaft portion of the right connecting portion 21 on the front side is inserted through the through hole 6H of the wood 6 and into the through hole 12H of the lower restraining member 12, and a nut NT is screwed onto the shaft portion protruding from the lower restraining member 12. be done. The pair of restraining members 10 and 12 are connected to each other by the front right connecting portion 21 arranged in this manner, and each of the restraining members 10 and 12 is attached to the wood 6 . 2 can be arranged at appropriate positions on the wood 6 and each of the restraining members 10, 12 in a similar manner.

こうして各連結部２１～２４は、図２～図４を参照して、上下方向に木材６を貫通した状態で、両拘束部材１０，１２の間に橋渡されて配設される。そして一対の右連結部２１，２２は、相対的に木材６の右端面８ｃ側に配設されているとともに、前後に大きく離間した状態とされて各拘束部材１０，１２同士を連結している。すなわち図３に示す平面視において、前側の右連結部２１は、木材６の前端面８ｅ側に配設され、後側の右連結部２２は、木材６の後端面８ｆ側に配設されている。そして本実施形態では、衝撃吸収部材４の上下方向が、本発明の「木材の入力端部側における平面視において（連結部の）橋渡し方向」に相当する。また衝撃吸収部材の前後方向が、本発明の「平面視における（連結部の）橋渡し方向と直交する方向」に相当する。そして図２に示す一対の左連結部２３（２４）も、各右連結部２１（２２）に倣って前後に大きく離間した状態で、相対的に木材６の左端面８ｄ側に配設されている。 2 to 4, each of the connecting portions 21 to 24 is bridged between the restraining members 10 and 12 while penetrating the wood 6 in the vertical direction. The pair of right connecting portions 21 and 22 are relatively arranged on the right end face 8c side of the wooden piece 6, and are separated from each other in the front-rear direction to connect the restraining members 10 and 12 together. . That is, in a plan view shown in FIG. 3, the front right connecting portion 21 is arranged on the front end surface 8e side of the wooden piece 6, and the rear right connecting portion 22 is arranged on the rear end surface 8f side of the wooden piece 6. there is In this embodiment, the vertical direction of the impact absorbing member 4 corresponds to the "bridging direction (of the connecting portion) in plan view on the input end side of the wood" of the present invention. Further, the front-rear direction of the shock absorbing member corresponds to the "direction orthogonal to the bridging direction (of the connecting portion) in plan view" of the present invention. A pair of left connecting portions 23 (24) shown in FIG. 2 are also arranged relatively on the left end surface 8d side of the wood 6 in a state of being greatly separated in the front-rear direction following the respective right connecting portions 21 (22). there is

［非連結領域］
そして図３を参照して、各右連結部２１，２２の間の各拘束部材１０，１２には、木材６の入力端側において連結部にて連結されていない非連結領域５０が形成される。この非連結領域５０は、各右連結部２１，２２が存在しない領域であり、本実施形態ではこれらの連結力が作用する領域（右連結部の近傍）を除くように設定している。そして非連結領域５０は、各右連結部２１，２２が存在しないため、各右連結部２１，２２によって木材６のスムーズな圧壊が過度に邪魔されるといった事態が極力回避されている。そこで本実施形態では、各拘束部材１０，１２に大きな非連結領域５０を意図的に設け、一対の拘束部材１０，１２で木材６を適度に拘束することにより、木材６のスムーズな圧壊を確保することが可能となっている。さらに衝撃吸収部材４では、非連結領域５０を大きくすることで、連結部の配設数を極力抑えることができ、軽量化と製造コストの低減に資する構成となっている。 [Unconnected area]
Then, referring to FIG. 3, a non-connecting region 50 that is not connected by the connecting portion is formed on the input end side of the wood 6 in each of the restraining members 10 and 12 between the right connecting portions 21 and 22. . The non-connecting area 50 is an area where the right connecting portions 21 and 22 do not exist, and is set so as to exclude the area (near the right connecting portion) where these connecting forces act in this embodiment. Since the right connecting portions 21 and 22 do not exist in the non-connecting region 50, the smooth crushing of the lumber 6 is prevented as much as possible by the right connecting portions 21 and 22.例文帳に追加Therefore, in this embodiment, a large unconnected region 50 is intentionally provided in each of the restraining members 10 and 12, and the pair of restraining members 10 and 12 appropriately restrains the wood 6, thereby ensuring smooth crushing of the wood 6. It is possible to Furthermore, in the impact absorbing member 4, by enlarging the non-connecting region 50, the number of connecting portions to be provided can be minimized, and the configuration contributes to weight reduction and manufacturing cost reduction.

［補強部］
そして図３を参照して、上側拘束部材１０の非連結領域５０には上側補強部３１が形成されており、下側拘束部材１２の非連結領域５０には下側補強部３２が形成されている。これら各補強部３１，３２は、荷重入力の際において、木材６から離れる外側への変形を規制するように各拘束部材１０，１２を補強する部位であり、その結果として各拘束部材１０，１２の荷重入力方向への塑性変形を促す部位でもある。そして各拘束部材１０，１２には、概ね同一基本構成の補強部が形成されているため、以下に、専ら上側拘束部材１０の上側補強部３１を一例にその詳細を説明する。 [Reinforcement part]
Then, referring to FIG. 3, an upper reinforcing portion 31 is formed in the non-connecting region 50 of the upper restraining member 10, and a lower reinforcing portion 32 is formed in the non-connecting region 50 of the lower restraining member 12. there is These reinforcing portions 31 and 32 are portions that reinforce each of the restraining members 10 and 12 so as to restrict their outward deformation away from the wood 6 when a load is input. It is also a part that promotes plastic deformation in the direction of load input. Since the restraint members 10 and 12 are provided with reinforcing portions having substantially the same basic configuration, the details of the upper reinforcement portion 31 of the upper restraint member 10 will be described below as an example.

図２及び図３に示す上側拘束部材１０では、上側補強部３１が、木材６の右端面８ｃ側に近接して形成されている。この上側補強部３１は、上側拘束部材１０の上外側面１０ｂが部分的に***した凸状部位であり、非連結領域５０を概ね網羅するように一対の右連結部２１，２２の一方から他方に向けて連続的に形成されている。そして上側補強部３１は、上側拘束部材１０の上外側面１０ｂから突出するリブとして機能し、外側（各図の上側）への変形を規制するように上外側面１０ｂの剛性（面外剛性）を向上させている。例えば本実施形態の上側補強部３１は、図５を参照して、上側拘束部材１０を概ねコ字状をなすように突出方向（図５の上側）に屈曲形成することで形成されている。そして上側補強部３１は、上側で起立する上側壁３１ａと、下側で起立する下側壁３１ｂと、両側壁の上側に渡されている天井壁３１ｃとを有している。 In the upper restraint member 10 shown in FIGS. 2 and 3, the upper reinforcing portion 31 is formed close to the right end face 8c of the wooden piece 6. As shown in FIG. The upper reinforcing portion 31 is a convex portion formed by partially protruding the upper outer side surface 10b of the upper restraining member 10, and extends from one of the pair of right connecting portions 21 and 22 to the other so as to substantially cover the non-connecting region 50. is formed continuously toward The upper reinforcing portion 31 functions as a rib protruding from the upper outer side surface 10b of the upper restraining member 10, and the rigidity (out-of-plane rigidity) of the upper outer side surface 10b so as to restrict deformation to the outside (upper side in each drawing). are improving. For example, referring to FIG. 5, the upper reinforcing portion 31 of the present embodiment is formed by bending the upper restraining member 10 in a protruding direction (upper side in FIG. 5) so as to form a generally U-shape. The upper reinforcing portion 31 has an upper side wall 31a that rises on the upper side, a lower side wall 31b that rises on the lower side, and a ceiling wall 31c that extends over the both side walls.

［補強部の形成位置及び突出寸法］
ここで図６を参照して、上側補強部３１の形成位置は、衝撃吸収部材４の衝撃吸収性に応じて設定でき、典型的には木材６の右端面８ｃ（入力端面）に近い位置に設定できる。なお上側補強部３１の形成位置の設定手法は特に限定しないが、例えば本実施形態では、木材６の左右の寸法を基準に当該形成位置を設定している。すなわち木材６の右端面８ｃから左端面８ｄまでの距離を基準距離Ｈ０とし、上側補強部３１の形成可能な領域を、右端面８ｃからの距離（第一距離Ｈ１）で規定する。このとき第一距離Ｈ１を、基準距離Ｈ０の１／３以下、好ましくは１／３程度（Ｈ１≒１／３×Ｈ０）に設定することで、衝撃吸収部材４の衝撃吸収性を確保することができる。さらに図５及び図６に示す上側補強部３１の突出寸法Ｐ（上外側面１０ｂから天井壁３１ｃまでの距離）も、上外側面１０ｂの剛性（面外剛性）を確保できるならば特に限定しないが、典型的には上側拘束部材１０の強度等に応じて設定できる。例えばアルミニウム製の上側拘束部材１０（厚み寸法Ｔ）を用いる場合、上側補強部３１の突出寸法Ｐを、厚み寸法Ｔの二倍以下（Ｄ≦２×Ｔ）に設定する。こうすることで、上外側面１０ｂの剛性（面外剛性）を確保しつつ、さらに上側拘束部材１０の適切な向きへの塑性変形をより確実に促すことが可能となる。 [Formation position and projection dimension of reinforcing part]
Here, referring to FIG. 6, the formation position of the upper reinforcing portion 31 can be set according to the shock absorbing property of the shock absorbing member 4, and is typically close to the right end face 8c (input end face) of the wood 6. Can be set. Although the method of setting the formation position of the upper reinforcing portion 31 is not particularly limited, for example, in the present embodiment, the formation position is set based on the left and right dimensions of the wooden piece 6 . That is, the distance from the right end face 8c to the left end face 8d of the wood 6 is defined as a reference distance H0, and the area where the upper reinforcement portion 31 can be formed is defined by the distance (first distance H1) from the right end face 8c. At this time, the first distance H1 is set to 1/3 or less of the reference distance H0, preferably about 1/3 (H1≈1/3×H0) to ensure the shock absorption of the shock absorbing member 4. can be done. Furthermore, the projection dimension P (the distance from the upper outer surface 10b to the ceiling wall 31c) of the upper reinforcing portion 31 shown in FIGS. However, typically, it can be set according to the strength of the upper restraint member 10 and the like. For example, when using the upper restraining member 10 (thickness dimension T) made of aluminum, the projection dimension P of the upper reinforcing portion 31 is set to be twice the thickness dimension T or less (D≦2×T). By doing so, it is possible to ensure the rigidity (out-of-plane rigidity) of the upper outer side surface 10b, and to more reliably promote the plastic deformation of the upper restraint member 10 in an appropriate direction.

そして図５に示す下側拘束部材１２においても、下側補強部３２が、木材６の右端面８ｃ側に近接して形成されている。この下側補強部３２は、下側拘束部材１２の下外側面１２ｂが部分的に***した凸状部位であり、上側補強部３１と上下対称となるように形成されている。そして下側補強部３２も、下側拘束部材１２を概ねコ字状に屈曲形成することで形成されており、別の上側壁３２ａと、別の下側壁３２ｂと、別の天井壁３２ｃとを有している。このため下側補強部３２も、下側拘束部材１２の下外側面１２ｂから突出するリブとして機能し、外側（各図の下側）への変形を規制するように下外側面１２ｂの剛性（面外剛性）を向上させている。 Also in the lower restraint member 12 shown in FIG. The lower reinforcing portion 32 is a convex portion formed by partially protruding the lower outer surface 12b of the lower restraining member 12, and is formed vertically symmetrical with the upper reinforcing portion 31. As shown in FIG. The lower reinforcement portion 32 is also formed by bending the lower restraint member 12 into a generally U-shape, and includes another upper wall 32a, another lower wall 32b, and another ceiling wall 32c. have. For this reason, the lower reinforcing portion 32 also functions as a rib protruding from the lower outer surface 12b of the lower restraining member 12, and the rigidity ( out-of-plane rigidity) is improved.

［衝撃吸収部材の衝撃吸収態様］
図１及び図２に示す衝撃吸収部材４によって、車両の衝突時などに車両の右側部２ｃに入力された荷重Ｆを吸収する。例えば本実施形態では、車両２の側突時において、図７及び図８を参照して、衝突物Ｘ（例えば電柱などの円筒状の物体）が衝突した場合を想定する。このとき衝撃吸収部材４では、衝突物Ｘとの衝突の際の荷重Ｆを、木材６が年輪の軸心方向Ａに向けて圧壊することで吸収する。また木材６の年輪の軸心方向Ａに沿って亀裂が入った場合、木材６を上下から挟み付けている一対の拘束部材１０，１２によって、木材６が極力割裂しないように拘束する。そして本実施形態では、木材６のスムーズな圧壊を確保するため、非連結領域５０を意図的に大きくして木材６を適度に拘束している。この種の衝撃吸収部材４では、上述の非連結領域５０に荷重Ｆが入力される場合、一対の右連結部２１，２２の間の各拘束部材１０，１２を、木材６を適度に拘束した状態で維持しつつ、適切な向きに塑性変形させることが望ましい。 [Impact absorption mode of impact absorption member]
The impact absorbing member 4 shown in FIGS. 1 and 2 absorbs the load F applied to the right side portion 2c of the vehicle at the time of vehicle collision or the like. For example, in the present embodiment, it is assumed that the vehicle 2 collides with a collision object X (for example, a cylindrical object such as a utility pole) with reference to FIGS. 7 and 8 during a side collision. At this time, the impact absorbing member 4 absorbs the load F upon collision with the colliding object X by crushing the wood 6 in the axial direction A of the tree ring. In addition, when a crack occurs along the axial direction A of the annual rings of the wood 6, a pair of restraining members 10 and 12 sandwiching the wood 6 from above and below restrain the wood 6 so as not to split as much as possible. In this embodiment, in order to ensure smooth crushing of the wooden piece 6, the unconnected region 50 is intentionally enlarged to restrain the wooden piece 6 appropriately. In the impact absorbing member 4 of this type, when the load F is input to the non-connecting region 50, the restraining members 10, 12 between the pair of right connecting portions 21, 22 restrain the wood 6 appropriately. It is desirable to plastically deform in an appropriate direction while maintaining the state.

そこで本実施形態では、図５、図７及び図８を参照して、非連結領域５０の各拘束部材１０（１２）に対応する補強部３１（３２）がそれぞれ設けられている。そして各補強部３１（３２）によって、荷重入力の際に木材６から離れる外側への変形を規制するように各拘束部材１０（１２）を補強して、これらの荷重入力方向への塑性変形を促すこととしている。ここで各拘束部材１０（１２）は、概ね同様の挙動で荷重Ｆを吸収することができる。そこで以下に、上側拘束部材１０を一例に、非連結領域５０における荷重Ｆの吸収態様について詳細に説明する。 Therefore, in this embodiment, with reference to FIGS. 5, 7 and 8, reinforcing portions 31 (32) corresponding to the respective restraining members 10 (12) of the non-connection region 50 are provided. Each of the restraining members 10 (12) is reinforced by each reinforcing part 31 (32) so as to restrict deformation to the outside away from the wood 6 when the load is input, thereby preventing plastic deformation in the load input direction. I am trying to encourage you. Here, each restraint member 10 (12) can absorb the load F with generally similar behavior. Therefore, the manner in which the load F is absorbed in the non-connecting region 50 will be described in detail below, taking the upper restraint member 10 as an example.

図７及び図８に示す衝撃吸収部材４では、非連結領域５０に衝突物Ｘが衝突した場合、その際の荷重Ｆを、木材６がその右端面８ｃ（入力端部）側で受け止める。つづいて木材６が、車両の内側である左方に（荷重入力方向に）圧壊すると同時に、上側拘束部材１０が荷重入力方向に向けて塑性変形していく。すなわち上側拘束部材１０では、上述したように上側補強部３１がリブとして機能し、外側（各図の上側）への変形を規制するように面外剛性を向上させている。このため荷重Ｆを受けた上側拘束部材１０では、外側への変形が上側補強部３１で規制される結果、荷重Ｆを吸収するために荷重入力方向への（適切な向きへの）塑性変形が促されることとなる。さらに本実施形態では、屈曲形成された上側補強部３１が上下に容易に潰れることができ、この上側補強部３１を起点として、上側拘束部材１０が荷重入力方向にスムーズに塑性変形して、木材６の圧壊に応じた座屈状態となっていく。こうして本実施形態の衝撃吸収部材４では、上側拘束部材１０を、木材６とともに適切な向きに塑性変形させていくことで、優れた衝撃吸収性の確保に資する構成となっている。そして上側拘束部材１０は、衝突物Ｘの外形に倣った円弧形状にスムーズに塑性変形し、衝突物Ｘの形状等に応じた荷重吸収性を発揮できる。 In the impact absorbing member 4 shown in FIGS. 7 and 8, when the collision object X collides with the non-connecting area 50, the load F at that time is received by the right end face 8c (input end) of the wood 6. As shown in FIG. Subsequently, the wood 6 is crushed leftward (in the load input direction), which is the inside of the vehicle, and at the same time, the upper restraint member 10 is plastically deformed in the load input direction. That is, in the upper restraint member 10, the upper reinforcement portion 31 functions as a rib as described above, and improves the out-of-plane rigidity so as to restrict deformation to the outside (upper side in each drawing). Therefore, in the upper restraint member 10 receiving the load F, deformation to the outside is restricted by the upper reinforcing portion 31, and as a result, plastic deformation in the load input direction (in an appropriate direction) occurs in order to absorb the load F. will be urged. Furthermore, in the present embodiment, the bent upper reinforcing portion 31 can be easily collapsed vertically, and the upper restraining member 10 is smoothly plastically deformed in the direction of load input from the upper reinforcing portion 31 as a starting point, and the wooden material is It becomes a buckling state according to the crushing of 6. In this manner, the impact absorbing member 4 of the present embodiment is configured to contribute to ensuring excellent impact absorption by plastically deforming the upper restraining member 10 together with the wood 6 in an appropriate direction. The upper restraint member 10 is smoothly plastically deformed into an arc shape that follows the outer shape of the colliding object X, and can exhibit load absorbing properties according to the shape of the colliding object X and the like.

以上説明した通り本実施形態では、各拘束部材１０，１２に非連結領域５０を設けることにより、木材６を、そのスムーズな圧壊変形を確保できるように適度に拘束している。そのうえで非連結領域５０に設けられた各補強部３１（３２）によって、各拘束部材１０（１２）の外側への変形を規制して荷重入力方向への塑性変形を促すことにより、優れた衝撃吸収性の確保に資する構成となっている。このため本実施形態によれば、木材６のスムーズな圧壊を確保しつつ、連結部間の拘束部材１０，１２の適切な向きへの変形を促すことができる。 As described above, in the present embodiment, each of the restraining members 10 and 12 is provided with the non-connecting region 50, thereby appropriately restraining the wood 6 so as to ensure smooth crushing deformation. In addition, the reinforcing portions 31 (32) provided in the non-connecting region 50 regulate outward deformation of the restraining members 10 (12) to promote plastic deformation in the load input direction, thereby achieving excellent shock absorption. It is a configuration that contributes to ensuring sexuality. Therefore, according to the present embodiment, it is possible to promote the deformation of the binding members 10 and 12 between the connecting portions in an appropriate direction while ensuring smooth crushing of the wood 6 .

さらに本実施形態では、各補強部３１（３２）が、拘束部材１０（１２）の対応する面１０ｂ（１２ｂ）を補強するリブとして機能することで、各拘束部材１０（１２）の外側への変形をより確実に規制することができる。特に本実施形態の補強部３１（３２）は、各拘束部材１０（１２）の対応する面１０ｂ（１２ｂ）を部分的に***させるように屈曲してなる部分であり、荷重入力方向に潰れるように塑性変形することが可能となっている。このため、各補強部３１（３２）を起点として、非連結領域５０の各拘束部材１０（１２）の荷重入力方向への変形をより確実に促すことができる。また本実施形態では、各補強部３１（３２）を、非連結領域５０を概ね網羅するように一対の連結部（２１，２２）の間に連続的に形成することで、各拘束部材１０（１２）の外側への変形をより広範囲に渡って規制することができる。そして本実施形態では、衝撃吸収部材４の長尺方向における両端側に連結部（２１，２２）をそれぞれ設け、非連結領域５０を相対的に大きくすることにより、木材６を、そのスムーズな圧壊変形を確保できるように適度に拘束している。そしてこのような場合においても、非連結領域５０に設けられた各補強部３１（３２）によって各拘束部材１０（１２）の荷重入力方向への変形を促すことができる。 Furthermore, in the present embodiment, each reinforcing portion 31 (32) functions as a rib that reinforces the corresponding surface 10b (12b) of the restraining member 10 (12), thereby allowing the restraining member 10 (12) to move outward. Deformation can be regulated more reliably. In particular, the reinforcing portion 31 (32) of this embodiment is a portion formed by bending the corresponding surface 10b (12b) of each restraining member 10 (12) so as to partially protrude, and is crushed in the load input direction. It is possible to plastically deform to Therefore, the deformation of the restraining members 10 (12) of the non-connecting region 50 in the load input direction can be promoted more reliably, starting from the reinforcing portions 31 (32). Further, in the present embodiment, each reinforcing portion 31 (32) is formed continuously between the pair of connecting portions (21, 22) so as to substantially cover the non-connecting region 50, so that each restraining member 10 ( 12) can be controlled over a wider range. In this embodiment, connecting portions (21, 22) are provided at both ends of the impact absorbing member 4 in the longitudinal direction, and the non-connecting region 50 is relatively enlarged, so that the wood 6 can be smoothly crushed. It is moderately restrained so that deformation can be secured. Even in such a case, the reinforcing portions 31 (32) provided in the non-connecting region 50 can promote the deformation of the restraining members 10 (12) in the load input direction.

［変形例１］
ここで補強部の構成は、上述の構成のほか、各種の構成をとり得る。例えば図９に示す変形例１の衝撃吸収部材４Ａでは、各拘束部材１０，１２が、実施形態１と概ね同一の基本構成を有しているが、各補強部３１Ａ（３２Ａ）が、各拘束部材の各外側面１０ｂ（１２ｂ）を部分的に肉盛りすることで形成されている点が実施形態１と異なっている。そして本変形例においても、肉盛りされて形成された補強部３１Ａ（３２Ａ）が、各拘束部材の各外側面１０ｂ（１２ｂ）から突出するリブとして機能し、外側への変形を規制するように各外側面１０ｂ（１２ｂ）の剛性を向上させている。また本変形例では、各拘束部材の内側面１０ａ（１２ａ）がそのままの状態で残っているため、木材６の対応する面８ａ（８ｂ）に安定的に当接させておくことができ、優れた拘束性の確保に資する構成となっている。なお補強部３１Ａ（３２Ａ）の形成手法は特に限定しないが、鋳造や切削の過程で形成でき、肉盛溶接やロウ接などの手法で各拘束部材１０，１２に後付けすることも可能である。 [Modification 1]
Here, the configuration of the reinforcing portion can take various configurations in addition to the configuration described above. For example, in a shock absorbing member 4A of Modified Example 1 shown in FIG. It differs from the first embodiment in that it is formed by partially building up each outer surface 10b (12b) of the member. Also in this modified example, the reinforcing portions 31A (32A) formed by building up function as ribs protruding from the outer side surfaces 10b (12b) of the restraining members, and restrict outward deformation. The rigidity of each outer surface 10b (12b) is improved. In addition, in this modification, since the inner surface 10a (12a) of each restraining member remains as it is, it can be stably brought into contact with the corresponding surface 8a (8b) of the wood 6, which is excellent. It is a configuration that contributes to ensuring binding. Although the method of forming the reinforcing portion 31A (32A) is not particularly limited, it can be formed in the process of casting or cutting, and can be retrofitted to the restraining members 10 and 12 by a method such as build-up welding or brazing.

［変形例２］
また図１０に示す変形例２の衝撃吸収部材４Ｂでは、拘束部材１０，１２とは別体の部材が後付けされ、この別体としての部材によって補強部３１Ｂ（３２Ｂ）が形成されている点が実施形態１と異なっている。ここで補強部３１Ｂ（３２Ｂ）を構成する部材は、適度な強度を有する板状又は柱状の部材（典型的に金属製）であり、溶接や締結などの手法によって各拘束部材１０（１２）に固定しておくことができる。そして本変形例では、補強部３１Ｂ（３２Ｂ）が各拘束部材の各外側面１０ｂ（１２ｂ）から突出する桟として機能し、外側への変形を規制するように各外側面１０ｂ（１２ｂ）の剛性を向上させている。なお本変形例では、必要に応じて剛性や突出寸法Ｐの異なる複数種類の補強部（別体としての部材）を用意しておくこともできる。そしてこれら複数種類の補強部の中から、衝撃吸収性や車両側の収容スペース等を考慮して使用すべき補強部３１Ｂ（３２Ｂ）を選択して各拘束部材１０（１２）に固定することができる。 [Modification 2]
In addition, in the shock absorbing member 4B of Modified Example 2 shown in FIG. 10, a member separate from the restraint members 10 and 12 is attached later, and the reinforcement portion 31B (32B) is formed by this separate member. It differs from the first embodiment. Here, the member that constitutes the reinforcing portion 31B (32B) is a plate-like or columnar member (typically made of metal) having an appropriate strength, and is attached to each restraining member 10 (12) by a technique such as welding or fastening. can be fixed. In this modified example, the reinforcing portion 31B (32B) functions as a crosspiece projecting from each outer side surface 10b (12b) of each restraining member, and the rigidity of each outer side surface 10b (12b) is controlled so as to restrict outward deformation. are improving. In addition, in this modified example, it is also possible to prepare a plurality of types of reinforcing portions (members as separate members) having different rigidity and projecting dimension P as necessary. From among these multiple types of reinforcements, it is possible to select the reinforcements 31B (32B) that should be used in consideration of impact absorption and the accommodation space on the vehicle side and fix them to each of the restraining members 10 (12). can.

［変形例３］
また図１１に示す変形例３の衝撃吸収部材４Ｃは、木材６（実施形態と同一構成）と、一対の拘束部材１０，１２（実施形態と同一構成）と、一対の連結部２１Ａ～２４Ａとを有している。そして本変形例では、各連結部２１Ａ～２４Ａが、概ねコ字状の板材で構成され且つ木材６を貫通していない点が実施形態１と異なっている。 [Modification 3]
A shock absorbing member 4C of Modified Example 3 shown in FIG. have. This modified example is different from the first embodiment in that each of the connecting portions 21A to 24A is made of a generally U-shaped plate material and does not penetrate the wood 6. As shown in FIG.

そして図１１に示す前側の右連結部２１Ａは、木材６の右端面８ｃと各拘束部材１０，１２をその右端側で上下に横断している（橋渡しされている）コ字状の板材であり、上下一対の屈曲端部２１ａ，２１ｂを有している。この前側の右連結部２１Ａでは、上下一対の屈曲端部２１ａ，２１ｂによって、一対の拘束部材１０，１２を外方から挟み付けて連結している。すなわち上側の屈曲端部２１ａは、前側の右連結部２１Ａの上縁が左方に屈曲している部分であり、上側拘束部材１０に沿った状態で溶接等の手法で固定されている。また下側の屈曲端部２１ｂは、前側の右連結部２１Ａの下縁が左方に屈曲している部分であり、下側拘束部材１２に沿った状態で固定されている。また後側の右連結部２２Ａは、木材６の右端面８ｃと各拘束部材１０，１２をその左端側で上下に横断しているコ字状の板材である。そして後側の右連結部２２Ａにも、上下一対の屈曲端部２２ａ，２２ｂが設けられており、これら各屈曲端部２２ａ，２２ｂによって、一対の拘束部材１０，１２を外方から挟み付けて連結している。 The right connecting portion 21A on the front side shown in FIG. 11 is a U-shaped plate material that vertically crosses (bridges) the right end surface 8c of the wood 6 and the restraining members 10 and 12 on the right end side thereof. , and a pair of upper and lower bent ends 21a and 21b. In the right connecting portion 21A on the front side, the pair of restraining members 10 and 12 are sandwiched and connected from the outside by the pair of upper and lower bent ends 21a and 21b. That is, the upper bent end portion 21a is a portion where the upper edge of the front right connecting portion 21A is bent leftward, and is fixed along the upper restraining member 10 by a technique such as welding. The bent end portion 21b on the lower side is a portion where the lower edge of the right connecting portion 21A on the front side is bent leftward, and is fixed along the lower restraint member 12. As shown in FIG. The right connecting portion 22A on the rear side is a U-shaped plate member vertically crossing the right end face 8c of the wooden piece 6 and the restraining members 10 and 12 at its left end side. A pair of upper and lower bent ends 22a and 22b are also provided on the right connecting portion 22A on the rear side, and the pair of restraining members 10 and 12 are sandwiched from the outside by the bent ends 22a and 22b. are connected.

また図１１に示す前側の左連結部２３Ａは、木材６の左端面８ｄと各拘束部材１０，１２をその左端側で上下に横断しているコ字状の板材であり、上下一対の屈曲端部２３ａ，２３ｂを有している。そして前側の左連結部２３Ａも、上下一対の屈曲端部２３ａ，２３ｂによって、一対の拘束部材１０，１２を外方から挟み付けて連結している。すなわち上側の屈曲端部２３ａは、前側の左連結部２３Ａの上縁が右方に屈曲している部分であり、上側拘束部材１０に沿った状態で固定されている。また下側の屈曲端部２３ｂは、前側の左連結部２３Ａの下縁が右方に屈曲している部分であり、下側拘束部材１２に沿った状態で固定されている。また後側の左連結部２４Ａは、木材６の左端面８ｄと各拘束部材１０，１２をその左端側で上下に横断しているコ字状の板材である。そして後側の左連結部２４Ａにも、上下一対の屈曲端部２４ａ，２４ｂが設けられており、これら各屈曲端部２４ａ，２４ｂによって、一対の拘束部材１０，１２を外方から挟み付けて連結している。 The left connecting portion 23A on the front side shown in FIG. 11 is a U-shaped plate material that vertically crosses the left end surface 8d of the wood 6 and the restraining members 10 and 12 at its left end side, and has a pair of upper and lower bent ends. It has portions 23a and 23b. The left connecting portion 23A on the front side also connects the pair of restraining members 10 and 12 from the outside by a pair of upper and lower bent ends 23a and 23b. That is, the upper bent end portion 23a is a portion where the upper edge of the front left connecting portion 23A is bent rightward, and is fixed along the upper restraining member 10. As shown in FIG. The bent end portion 23b on the lower side is a portion where the lower edge of the front left connecting portion 23A is bent rightward, and is fixed along the lower restraining member 12. As shown in FIG. The left connecting portion 24A on the rear side is a U-shaped plate member vertically crossing the left end surface 8d of the wood 6 and the restraining members 10 and 12 at the left end side thereof. A pair of upper and lower bent ends 24a and 24b are also provided on the rear left connecting portion 24A, and the pair of restraining members 10 and 12 are sandwiched from the outside by the bent ends 24a and 24b. are connected.

そして本変形例においても、木材６を挟み付けるように一対の拘束部材１０，１２を対向配置し、これら一対の拘束部材１０，１２を、各連結部２１Ａ～２４Ａによって連結し且つ木材６に取付けている。このため本変形例においても、実施形態１と同様に、衝撃吸収部材４Ａの木材６を、荷重入力時におけるスムーズな変形をより確実に確保しつつ拘束することができる。特に本変形例では、木材６に貫通部用の貫通孔を設けなくとも良いため、木材６の剛性を適切に維持できるとともに、各連結部２１Ａ～２４Ａの配設作業を簡便に行うことができる。なお本変形例では、各連結部２１Ａ～２４Ａを、木材６の前端面８ｅと後端面８ｆを横断するように木材６の前後端に設けることもできる。なお本変形例では、左右の各連結部２１Ａ，２３Ａ（２２Ａ，２４Ａ）を一つなぎとして枠状に形成することも可能である。 Also in this modified example, a pair of restraining members 10 and 12 are arranged to face each other so as to sandwich the wood 6, and the pair of restraining members 10 and 12 are connected and attached to the wood 6 by connecting portions 21A to 24A. ing. Therefore, in this modified example, similarly to the first embodiment, the wood 6 of the impact absorbing member 4A can be restrained while ensuring smooth deformation when a load is input. Especially in this modified example, since it is not necessary to provide a through hole for the through portion in the wooden piece 6, the rigidity of the wooden piece 6 can be appropriately maintained, and the connecting portions 21A to 24A can be easily arranged. . In this modified example, each connecting portion 21A to 24A can be provided at the front and rear ends of the wooden piece 6 so as to cross the front end surface 8e and the rear end surface 8f of the wooden piece 6. As shown in FIG. In this modified example, the left and right connecting portions 21A and 23A (22A and 24A) can be connected together to form a frame shape.

［実施形態２］
図１２及び図１３に示す実施形態２の衝撃吸収部材４Ｄでは、実施形態１の衝撃吸収部材とほぼ同一の基本構成を備える構成については、対応する符号を付す等して詳細な説明を省略する。実施形態２の衝撃吸収部材４Ｄは、木材６（実施形態１と同一構成）と、一対の拘束部材１０，１２と、複数の連結部２１～２４（実施形態１と同一構成）とを有している。そして本実施形態では、各補強部（上側補強部３１Ｄ，下側補強部３２Ｄ）が、対応する拘束部材１０，１２の右端側に設けられたフランジ状の部位である点が実施形態１と異なっている。 [Embodiment 2]
In the shock absorbing member 4D of the second embodiment shown in FIGS. 12 and 13, the components having substantially the same basic structure as the shock absorbing member of the first embodiment are denoted by corresponding reference numerals, and detailed description thereof is omitted. . The shock absorbing member 4D of the second embodiment has a wooden piece 6 (same configuration as the first embodiment), a pair of restraining members 10 and 12, and a plurality of connecting portions 21 to 24 (same configuration as the first embodiment). ing. The present embodiment differs from the first embodiment in that each reinforcing portion (upper reinforcing portion 31D, lower reinforcing portion 32D) is a flange-shaped portion provided on the right end side of the corresponding restraining members 10 and 12. ing.

すなわち本実施形態では、図１２に示す上側拘束部材１０の非連結領域５０の右端側に、下方に向けて屈曲するフランジ状の上側補強部３１Ｄが設けられている。また下側拘束部材１２の非連結領域５０の右端側に、上方に向けて屈曲するフランジ状の下側補強部３２Ｄが設けられている。そして上側補強部３１Ｄと下側補強部３２Ｄとは、いずれも前後方向に長尺な矩形状の板状部位であり、木材６の右端面８ｃに沿って配置されている。また上側補強部３１Ｄと下側補強部３２Ｄとは、木材６の右端面８ｃに対する荷重Ｆの入力が可能なように分断された状態となっている。例えば本実施形態では、上側補強部３１Ｄと下側補強部３２Ｄが適宜の間隔で上下に離間しており、これらの間から木材６の右端面８ｃが露出している。 That is, in the present embodiment, a flange-shaped upper reinforcing portion 31D that bends downward is provided on the right end side of the non-connecting region 50 of the upper restraining member 10 shown in FIG. A flange-shaped lower reinforcing portion 32D that bends upward is provided on the right end side of the non-connecting region 50 of the lower restraining member 12 . Both the upper reinforcing portion 31D and the lower reinforcing portion 32D are rectangular plate-like portions elongated in the front-rear direction, and are arranged along the right end surface 8c of the wooden piece 6. As shown in FIG. The upper reinforcing portion 31D and the lower reinforcing portion 32D are separated so that the load F can be applied to the right end surface 8c of the wood 6. As shown in FIG. For example, in this embodiment, the upper reinforcing portion 31D and the lower reinforcing portion 32D are spaced apart vertically at an appropriate interval, and the right end face 8c of the wood 6 is exposed from between them.

［補強部の突出寸法］
ここで図１３を参照して、各補強部３１Ｄ（３２Ｄ）の突出寸法Ｐ１は、各外側面１０ｂ（１２ｂ）の剛性を確保できるならば特に限定しないが、木材６の右端面８ｃに対する荷重Ｆの入力が可能なように設定することが望ましい。例えば本実施形態のように各補強部３１Ｄ，３２Ｄを対称形状とした場合、各補強部３１Ｄ，３２Ｄの突出寸法Ｐ１を、各拘束部材１０，１２の間の離間寸法Ｄ１の二倍以下に設定することが望ましい。なお各補強部３１Ｄ，３２Ｄの突出寸法を異ならせてこれらを非対称形状とすることもでき、この場合においても、これらを分断させておくことが望ましい。 [Protrusion dimension of reinforcing part]
Here, referring to FIG. 13, the projecting dimension P1 of each reinforcing portion 31D (32D) is not particularly limited as long as the rigidity of each outer side surface 10b (12b) can be ensured. It is desirable to set so that the input of For example, when the reinforcing portions 31D and 32D are symmetrical as in the present embodiment, the projecting dimension P1 of the reinforcing portions 31D and 32D is set to twice or less the distance D1 between the restraining members 10 and 12. It is desirable to The reinforcing portions 31D and 32D may have different protruding dimensions to make them asymmetrical. In this case as well, it is desirable to divide them.

そして本実施形態の衝撃吸収部材４Ｄにおいても、非連結領域５０に衝突物Ｘが衝突した場合、その際の荷重Ｆを、両補強部３１Ｄ，３２Ｄの間から露出した木材６が受け止める。つづいて木材６が、車両の内側である左方に（荷重入力方向に）圧壊すると同時に、各拘束部材１０，１２が荷重入力方向に向けて塑性変形していく。そして各拘束部材１０（１２）においても、対応する補強部３１Ｄ（３２Ｄ）がリブとして機能し、外側への変形を規制するように剛性が向上している。このため荷重Ｆを受けた各拘束部材１０（１２）においても、外側への変形が各補強部３１Ｄ（３２Ｄ）で規制される結果、荷重Ｆを吸収するために荷重入力方向への（適切な向きへの）塑性変形が促されることとなる。こうして本実施形態の衝撃吸収部材４Ｄにおいても、各拘束部材１０（１２）を、木材６とともに適切な向きに塑性変形させていくことで、優れた衝撃吸収性の確保に資する構成となっている。さらに本実施形態では、各補強部３１Ｄ，３２Ｄが、対応する拘束部材１０，１２の右端側を屈曲させることで形成できるため、製造時の手間を省くことが可能となり、製造コストの削減に資する構成となっている。 Also in the impact absorbing member 4D of this embodiment, when the colliding object X collides with the non-connecting region 50, the load F at that time is received by the wood 6 exposed between the reinforcing portions 31D and 32D. Subsequently, the wood 6 is crushed leftward (in the load input direction), which is the inside of the vehicle, and at the same time, the restraint members 10 and 12 are plastically deformed in the load input direction. Also in each of the restraining members 10 (12), the corresponding reinforcing portion 31D (32D) functions as a rib, and the rigidity is improved so as to restrict outward deformation. Therefore, in each restraint member 10 (12) that receives the load F, as a result of the outward deformation being regulated by each reinforcing portion 31D (32D), the load F is absorbed in the load input direction (appropriate direction) will be promoted. Thus, in the impact absorbing member 4D of the present embodiment as well, each restraining member 10 (12) is plastically deformed in an appropriate direction together with the wooden piece 6, thereby contributing to ensuring excellent impact absorption. . Furthermore, in the present embodiment, the reinforcing portions 31D and 32D can be formed by bending the right end sides of the corresponding restraining members 10 and 12, which makes it possible to save time and effort during manufacturing, which contributes to a reduction in manufacturing costs. It is configured.

本実施形態の衝撃吸収部材４等は、上述した実施形態に限定されるものではなく、その他各種の実施形態を取り得る。例えば本実施形態では、木材６と各拘束部材１０，１２の構成（形状，寸法，配置関係など）を例示したが、各部材の構成を限定する趣旨ではない。例えば木材は、立方体や直方体などの各種立体形状を取り得るとともに、荷重の入力方向に応じてその配置位置を設定することができる。また各拘束部材も、木材の適宜の位置に配置することができ、例えば本実施形態の衝撃吸収部材では、木材の上面と下面と前面と後面の適宜の位置に配置することができる。そして衝撃吸収部材は、衝突物に直接衝突する構成としてもよく、衝突物と間接的に衝突する構成としてもよい。例えば衝撃吸収部材を、車両のフロントメンバとサイドメンバの間に介装して固定することで、衝突物に間接的に衝突する構成とすることができる。また本実施形態の車両の構成も適宜変更可能であり、ボディの構成も車両に合わせて適宜変更可能である。そして車両側の構成に応じて、衝撃吸収部材の取付け手法を選択でき、木材の基端部の少なくとも一部をボディに接した状態としてもよく、ボディに非接触状態としておくことも可能である。 The impact absorbing member 4 and the like of this embodiment are not limited to the above-described embodiment, and can take various other embodiments. For example, in the present embodiment, the configuration (shape, size, positional relationship, etc.) of the wood 6 and each of the restraining members 10 and 12 is illustrated, but the configuration of each member is not intended to be limited. For example, wood can take various three-dimensional shapes such as a cube and a rectangular parallelepiped, and its arrangement position can be set according to the input direction of the load. Each restraining member can also be arranged at an appropriate position on the wooden piece. For example, in the impact absorbing member of the present embodiment, it can be arranged at an appropriate position on the upper surface, the lower surface, the front surface, and the rear surface of the wooden piece. The impact absorbing member may be configured to directly collide with the colliding object, or may be configured to indirectly collide with the colliding object. For example, by interposing and fixing the shock absorbing member between the front member and the side member of the vehicle, it is possible to indirectly collide with the collision object. Further, the configuration of the vehicle of the present embodiment can be changed as appropriate, and the configuration of the body can also be changed as appropriate in accordance with the vehicle. The mounting method of the impact absorbing member can be selected according to the configuration of the vehicle, and at least a portion of the base end of the wood may be in contact with the body, or may be in non-contact with the body. .

また本実施形態及び各変形例では、各連結部２１～２４等の構成（形状，寸法，配置位置など）を例示したが、各連結部の構成を限定する趣旨ではない。例えば連結部は、ボルト状の軸部材や板状の部材のほか、クリップ状の部材（貫通孔の周縁に係止可能な係止部を有する軸状の部材）やキャップ状の部材で構成されていてもよく、各連結部の両端を対応する拘束部材に溶接などの手法で固定することもできる。また連結部を、拘束部材の一部に一体的に設けておくこともできる。例えば一方の拘束部材の内面に軸状の連結部を立設しておき、この連結部を、他方の拘束部材に締結などの手法で固定することができる。また右連結部と左連結部のように一対の連結部を複数組設けることができ、一対の連結部を単数設けることもできる。 In addition, although the configuration (shape, size, arrangement position, etc.) of each of the connecting portions 21 to 24 and the like has been illustrated in the present embodiment and each modified example, the configuration of each connecting portion is not intended to be limited. For example, the connecting portion may be a bolt-shaped shaft member, a plate-shaped member, a clip-shaped member (a shaft-shaped member having a locking portion that can be locked to the periphery of the through hole), or a cap-shaped member. Alternatively, both ends of each connecting portion can be fixed to corresponding restraining members by a technique such as welding. Also, the connecting portion can be provided integrally with a part of the restraining member. For example, a shaft-like connecting portion may be erected on the inner surface of one of the restraining members, and this connecting portion may be fixed to the other restraining member by a method such as fastening. Moreover, a plurality of pairs of connecting portions can be provided, such as the right connecting portion and the left connecting portion, or a single pair of connecting portions can be provided.

また本実施形態では、各補強部３１，３２等の構成を例示したが、補強部の構成を限定する趣旨ではない。例えば補強部を、対応する拘束部材に断続的に形成することができる。また補強部の外形も、直線状や曲線状や段差状などの各種の形状を取り得るとともに、断続的に形成する場合には、各種の幾何学的な形状とすることができる。また拘束部材を曲げ形成して補強部を形成する場合、補強部は、断面でコ字状のほか、三角形状などの多角形状や、半円形状や楕円形状など各種の形状をとり得る。そして補強部は、各拘束部材に単数又は３以上設けることができ、補強部を複数設ける場合にはこれらを荷重入力方向に並べて形成することができる。また補強部は、各拘束部材の外側面と内側面の少なくとも一方に形成でき、内側面に形成する場合には、補強部を、木材に設けた孔部又は溝部に挿入しておくことができる。そして補強部は、衝突物の形状に応じた形状を取ることができ、例えば電柱などの円筒状の衝突物を想定した場合には補強部を円弧形状に形成することができる。そして実施形態の衝撃吸収部材の構成と、各変形例の衝撃吸収部材の構成は、適宜組み合わせて用いることができる。 Moreover, although the configuration of each of the reinforcing portions 31, 32 and the like is illustrated in the present embodiment, it is not intended to limit the configuration of the reinforcing portion. For example, reinforcements can be intermittently formed in corresponding restraint members. Further, the outer shape of the reinforcing portion can also take various shapes such as a linear shape, a curved shape, and a stepped shape. When the restraining member is bent to form the reinforcing portion, the reinforcing portion may have a U-shaped cross section, a polygonal shape such as a triangular shape, a semicircular shape, an elliptical shape, and other various shapes. A single reinforcing portion or three or more reinforcing portions can be provided in each restraining member, and when a plurality of reinforcing portions are provided, they can be formed side by side in the load input direction. Further, the reinforcing portion can be formed on at least one of the outer surface and the inner surface of each restraining member. When forming on the inner surface, the reinforcing portion can be inserted into a hole or groove provided in the wood. . The reinforcing portion can have a shape corresponding to the shape of the colliding object. For example, when a cylindrical colliding object such as a utility pole is assumed, the reinforcing portion can be formed in an arc shape. The configuration of the shock absorbing member of the embodiment and the configuration of the shock absorbing member of each modified example can be used in combination as appropriate.

２ｃＸ 公知技術の車両の右側部
４Ｘ 公知技術の衝撃吸収部材
６Ｘ 公知技術の木材
１０Ｘ，１２Ｘ 公知技術の拘束部材
ＢＭ 公知技術の連結部
２ 車両
２ａ 車両の前部
２ｂ 車両の後部
２ｃ 車両の右側部
２ｄ 車両の左側部
３ ボディ
４ 衝撃吸収部材
６ 木材
６Ｈ 連結部用の貫通孔
８ａ 木材の上面
８ｂ 木材の下面
８ｃ 木材の右端面
８ｄ 木材の左端面
８ｅ 木材の前端面
８ｆ 木材の後端面
１０ 上側拘束部材
１０ａ 上側拘束部材の下内側面
１０ｂ 上側拘束部材の上外側面
１０ｃ 上側拘束部材の右端
１０ｄ 上側拘束部材の左端
１０Ｈ 連結部用の貫通孔
１２ 下側拘束部材
１２ａ 下側拘束部材の上内側面
１２ｂ 下側拘束部材の下外側面
１２ｃ 下側拘束部材の右端
１２ｄ 下側拘束部材の左端
１２Ｈ 連結部用の貫通孔
２１ 前側の右連結部
２２ 後側の右連結部
２３ 前側の左連結部
２４ 後側の左連結部
ＨＭ 頭部
ＮＴ ナット
３１ 上側補強部
３１ａ 上側補強部の上側壁
３１ｂ 上側補強部の下側壁
３１ｃ 上側補強部の天井壁
３２ 下側補強部
３２ａ 下側補強部の上側壁
３２ｂ 下側補強部の下側壁
３２ｃ 下側補強部の天井壁
５０ 非連結領域
４Ａ 変形例１の衝撃吸収部材
３１Ａ,３２Ａ 変形例１の補強部
４Ｂ 変形例２の衝撃吸収部材
３１Ｂ,３２Ｂ 変形例２の補強部
４Ｃ 変形例３の衝撃吸収部材
２１Ａ 変形例３の前側の右連結部
２２Ａ 変形例３の後側の右連結部
２３Ａ 変形例３の前側の左連結部
２４Ａ 変形例３の後側の左連結部
４Ｄ 実施形態２の衝撃吸収部材
３１Ｄ 実施形態２の上側補強部
３２Ｄ 実施形態２の下側補強部
Ｆ 荷重（衝撃荷重）
Ｘ 衝突物
2cX Well-known technology vehicle right side 4X Well-known technology impact absorbing member 6X Well-known technology wood 10X, 12X Well-known technology restraining member BM Well-known technology coupling 2 Vehicle 2a Vehicle front 2b Vehicle rear 2c Vehicle right side 2d Vehicle left side 3 Body 4 Impact absorbing member 6 Wood 6H Through hole 8a for connecting portion Top surface of wood 8b Bottom surface of wood 8c Right end surface of wood 8d Left end surface of wood 8e Front end surface of wood 8f Rear end surface of wood 10 Upper side Constraining member 10a Lower inner side 10b of the upper constraining member Upper outer side 10c of the upper constraining member Right end 10d of the upper constraining member Left end 10H of the upper constraining member Through hole 12 for connecting portion Lower constraining member 12a Upper inner side of the lower constraining member Side surface 12b Lower outer surface 12c of lower restraining member Right end 12d of lower restraining member Left end 12H of lower restraining member Through hole 21 for connecting portion Right connecting portion 22 Right connecting portion 23 Right connecting portion 23 Front left connecting portion 24 Rear left connecting part HM Head NT Nut 31 Upper reinforcing part 31a Upper wall 31b of upper reinforcing part Lower wall 31c of upper reinforcing part Ceiling wall 32 of upper reinforcing part Lower reinforcing part 32a Upper wall of lower reinforcing part 32b Lower side wall 32c of lower reinforcement portion Ceiling wall 50 of lower reinforcement portion Non-connected region 4A Shock absorbing members 31A and 32A of modified example 1 Reinforced portion 4B of modified example 1 Shock absorbing members 31B and 32B of modified example 2 Modified example 2 reinforcement portion 4C impact absorbing member 21A of modification 3 front right connection portion 22A of modification 3 rear right connection portion 23A of modification 3 front left connection portion 24A of modification 3 rear side of modification 3 Left connecting portion 4D Impact absorbing member 31D of Embodiment 2 Upper reinforcing portion 32D of Embodiment 2 Lower reinforcing portion F of Embodiment 2 Load (impact load)
X collision object

Claims (5)

木材と、前記木材よりも硬い一対の拘束部材と、前記一対の拘束部材同士を連結し且つ各拘束部材を前記木材に取付けている連結部とを備え、
前記木材は、年輪の軸心方向が荷重の入力方向に沿うように配置されるとともに、荷重入力側に位置する入力端部を有し、
前記一対の拘束部材は、前記木材の入力端部側における平面視において、前記木材の入力端部を挟み付けるように対向して配置された状態で、両拘束部材の間に橋渡された一対の連結部で連結されている車両の衝撃吸収部材において、
前記一対の連結部が、前記平面視において橋渡し方向と直交する方向に離間して配置されることで、前記一対の連結部の間に位置する前記各拘束部材に、連結部にて連結されていない非連結領域が形成されており、
前記非連結領域には、荷重入力の際に前記木材から離れる外側への変形を規制するように前記各拘束部材を補強してその荷重入力方向への塑性変形を促す補強部が設けられており、
荷重の入力方向において前記入力端部からその反対側の端部までの距離を基準距離として、前記入力端部から前記基準距離の１／３離れた位置までの領域を入力端部側の領域とした場合、前記補強部は、前記入力端部側の領域のみに設けられている車両の衝撃吸収部材。 a piece of wood, a pair of restraining members harder than the wood, and a connection portion connecting the pair of restraining members and attaching each of the restraining members to the wood,
The lumber is arranged so that the axial direction of annual rings is along the direction of load input, and has an input end located on the load input side,
In a plan view on the input end side of the wood, the pair of restraint members are arranged to face each other so as to sandwich the input end of the wood, and are bridged between the restraint members. In a vehicle shock absorbing member connected by a connecting portion,
By arranging the pair of connecting portions in a direction orthogonal to the bridging direction in plan view, the restraining members positioned between the pair of connecting portions are connected by the connecting portions. A non-connected region is formed,
The non-connecting region is provided with a reinforcing portion that reinforces each of the restraining members so as to restrict deformation to the outside away from the wood when a load is input, and promotes plastic deformation in the load input direction. ,
The distance from the input end to the opposite end in the input direction of the load is defined as a reference distance, and the area from the input end to a position 1/3 of the reference distance is defined as the input end side area. In this case, the reinforcing portion is provided only in the region on the input end portion side . 前記各拘束部材は、各々、前記木材を臨む内側面と、前記内側面とは反対の外側面とを有し、前記補強部は、前記内側面と前記外側面の少なくとも一方から突出している請求項１に記載の車両の衝撃吸収部材。 Each of the restraining members has an inner surface facing the wood and an outer surface opposite to the inner surface, and the reinforcing portion protrudes from at least one of the inner surface and the outer surface. Item 2. The impact absorbing member for a vehicle according to item 1. 前記補強部は、前記内側面と前記外側面の少なくとも一方を部分的に***させるように前記各拘束部材を突出方向に曲げ形成してなる部位である請求項２に記載の車両の衝撃吸収部材。 3. The impact absorbing member for a vehicle according to claim 2, wherein the reinforcing portion is formed by bending each of the restraining members in a projecting direction so as to partially bulge at least one of the inner surface and the outer surface. . 前記補強部は、前記一対の連結部の一方から他方に向けて連続的に形成されている請求項１～３のいずれか一項に記載の車両の衝撃吸収部材。 4. The impact absorbing member for a vehicle according to claim 1, wherein said reinforcing portion is formed continuously from one of said pair of connecting portions toward the other. 衝撃吸収部材の外形が所定の方向に長尺な柱形状又は板形状とされており、
前記一対の拘束部材は、長尺方向における各端側に位置する各連結部にて連結されている請求項１～４のいずれか一項に記載の車両の衝撃吸収部材。 The outer shape of the shock absorbing member is a column shape or a plate shape elongated in a predetermined direction,
5. The impact absorbing member for a vehicle according to claim 1, wherein the pair of restraining members are connected at respective connecting portions located at respective ends in the longitudinal direction.

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