JP4737397B2

JP4737397B2 - Rear body structure of automobile

Info

Publication number: JP4737397B2
Application number: JP2005225164A
Authority: JP
Inventors: 学田村; 雅博朝日; 洋田中; 孝之砂川
Original assignee: Mazda Motor Corp
Current assignee: Mazda Motor Corp
Priority date: 2005-08-03
Filing date: 2005-08-03
Publication date: 2011-07-27
Anticipated expiration: 2025-08-03
Also published as: JP2007038840A

Description

本発明は、自動車の後部車体構造において、特にスペアタイヤパンにタイダウンフックを設けた場合に、後突時に車体後部に作用する衝突エネルギーの吸収性能を向上させたものに関する。 The present invention relates to a rear body structure of an automobile, in particular, when a tie-down hook is provided on a spare tire pan, improving the absorption performance of collision energy acting on the rear part of the vehicle body at the time of a rear collision.

一般に、自動車の後部には、左右１対のリヤサイドフレームが設けられ、近年、これらリヤサイドフレームの後端部に、衝突エネルギーを吸収可能な左右のクラッシュカンを介して車幅方向に延びるバンパービームを連結した構造が主流である。車両の後突時には、バンパービームから伝達される衝突荷重によりクラッシュカンが圧縮変形して潰れることで衝突エネルギーを吸収し、リヤサイドフレームの圧縮変形によっても衝突エネルギーを吸収することで、車室に加わる衝撃を緩和している。 In general, a pair of left and right rear side frames are provided at the rear of the automobile. In recent years, bumper beams extending in the vehicle width direction through left and right crash cans capable of absorbing collision energy are provided at the rear ends of these rear side frames. The connected structure is the mainstream. At the time of rear-end collision of the vehicle, the crash can is compressed and deformed by the collision load transmitted from the bumper beam to absorb the collision energy, and the collision energy is also absorbed by the compression deformation of the rear side frame. The shock is mitigated.

ところで、自動車の後部には、車両を船舶などに積載して輸送する際に動かないように車体の前部と後部の左右側をロープなどで固定する為のタイダウンフックがブラケットなどを介して取付けられているが、そのブラケットの周辺に補強部材を設けてタイダウンフックの支持剛性を高めるだけでなく車体後部の剛性も高める技術が公知である。 By the way, a tie-down hook for fixing the left and right sides of the front and rear of the vehicle with a rope or the like is provided at the rear of the automobile via a bracket so that it does not move when the vehicle is loaded on a ship or the like. Although it is mounted, a technique is known in which a reinforcing member is provided around the bracket to increase the rigidity of the rear portion of the vehicle body as well as to increase the rigidity of the support of the tie-down hook.

例えば、特許文献１に記載の後部ボディの補強構造においては、エクステンションリヤフロアパネルの後部下面に牽引フックを固定ブラケットを介して固定し、リヤフロアパネルの後部から固定ブラケットに亙って略平行に１対のレインフォースメントを配設し、リアフロアパネルとエクステンションリヤフロアパネルとレインフォースメントとで前後方向に延びる閉断面を形成することで、上記両パネルの結合部位の剛性を高めている。 For example, in the reinforcement structure of the rear body described in Patent Document 1, a tow hook is fixed to the lower surface of the rear portion of the extension rear floor panel via a fixing bracket, and a pair of substantially parallel pairs extends from the rear portion of the rear floor panel over the fixing bracket. This reinforcement is provided, and the rear floor panel, the extension rear floor panel, and the reinforcement form a closed cross section extending in the front-rear direction, thereby increasing the rigidity of the joint portion between the two panels.

特許文献２に記載の車体構造においては、左右１対のリヤサイドフレームの後端部付近において車幅方向外側に、タイダウンブラケットとこのタイダウンブラケットを補強するレインフォースブラケットからなるタイダウンフックを設けるとともに、タイダウンフックが接合されたリヤサイドフレームに対応する部位の内面にタイダウンレインフォースを接合することで、リヤサイドフレームの剛性を高めている。
特開平７−１１７７３１号公報特開２００５−１１９５５０号公報 In the vehicle body structure described in Patent Document 2, a tie-down hook including a tie-down bracket and a reinforcement bracket that reinforces the tie-down bracket is provided on the outer side in the vehicle width direction near the rear ends of the pair of left and right rear side frames. At the same time, the rigidity of the rear side frame is increased by joining a tie down reinforcement to the inner surface of the portion corresponding to the rear side frame to which the tie down hook is joined.
JP 7-117731 A JP 2005-119550 A

しかし、特許文献１の後部ボディの補強構造においては、両パネルの結合部位の剛性を高めているものの、後突時における車体後部の衝突エネルギー吸収性能を向上させるものではない。他方、特許文献２の車体構造においては、後突時における車体後部の衝突エネルギー吸収性能に寄与するリヤサイドフレームの剛性を高めているものの、タイダウンフックが接合されたリヤサイドフレームに対応する部位の内面にタイダウンレインフォースが接合されるので、後突時にリヤサイドフレームが圧縮変形する際に、リヤサイドフレームの内面に接合されたタイダウンレインフォースが邪魔になるため、その部位で圧縮変形しにくくなり後突時における車体後部の衝突エネルギー吸収性能が低下する虞がある。しかも、各リヤサイドフレームにタイダウンブラケットとレインフォースブラケットとを有するタイダウンフックとタイダウンレインフォースを設けたので、補強のための部品点数が増加し製作コストが高くなる。 However, in the reinforcement structure of the rear body of Patent Document 1, although the rigidity of the joint portion of both panels is increased, it does not improve the collision energy absorption performance of the rear part of the vehicle body at the time of rear collision. On the other hand, in the vehicle body structure of Patent Document 2, although the rigidity of the rear side frame that contributes to the collision energy absorption performance at the rear of the vehicle body at the time of a rear collision is increased, the inner surface of the portion corresponding to the rear side frame to which the tie-down hook is joined Because the tie-down reinforcement is joined to the inner side of the rear side frame when the rear side frame is compressed and deformed during a rear-end collision, the tie-down reinforcement that is joined to the inner surface of the rear side frame is in the way, making it difficult to compress and deform at that part. There is a possibility that the collision energy absorption performance of the rear part of the vehicle body at the time of a collision is lowered. In addition, since the tie-down hook and tie-down reinforcement having the tie-down bracket and the reinforcement bracket are provided on each rear side frame, the number of parts for reinforcement increases and the manufacturing cost increases.

本発明の目的は、自動車の後部車体のタイダウンフック取付補強部材を有効活用して、部品数を増すことなく、後部車体の後端部の剛性・強度を高めること、タイダウンフック取付補強部材の支持強度を高めることなどである。 An object of the present invention is to effectively utilize a tie-down hook mounting reinforcement member for a rear body of an automobile to increase the rigidity and strength of the rear end portion of the rear body without increasing the number of parts. For example, to increase the support strength.

請求項１の自動車の後部車体構造は、左右１対のリヤサイドフレームと、下方に凹んだスペアタイヤパンを有するフロアパネルと、タイダウンフック取付補強部材を介してスペアタイヤパンに取付けられるタイダウンフックとを有する自動車の後部車体構造において、前記左右１対のリヤサイドフレームはフロアパネルの下面と協働して前後方向に延びる閉断面を形成し、前記スペアタイヤパンの車幅方向外側部の上端側湾曲部と協働してフロアパネルの下面側に前後方向に延びる閉断面を形成するフロア補強部材であって、前記リヤサイドフレームから離隔した位置に設けられたフロア補強部材を備え、前記タイダウンフック取付補強部材は、前記スペアタイヤパンの車幅方向外側部の下端側湾曲部から上端部付近に亙って接合されるとともに前記リヤサイドフレームとフロア補強部材から離隔した位置にスペアタイヤパンと協働して閉断面を形成し、前記タイダウンフック取付補強部材の後端部分には、スペアタイヤパンとフロア補強部材との間に延びる延出部を設け、前記延出部は前記フロア補強部材とスペアタイヤパンとに接合され、前記フロアパネル後端は鉛直上方に折曲されてリヤエンドパネルに接合され、前記延出部はフロアパネル後端まで延びるとともに、フロアパネル後端と同方向に折曲されて、フロアパネルとともにリヤエンドパネルに接合されたことを特徴とする。 The rear vehicle body structure of the vehicle according to claim 1 includes a pair of left and right rear side frames, a floor panel having a spare tire pan recessed downward, and a tie-down hook attached to the spare tire pan via a tie-down hook attachment reinforcing member. The pair of left and right rear side frames cooperate with the lower surface of the floor panel to form a closed cross section extending in the front-rear direction, and the upper end side of the spare tire pan in the vehicle width direction outer side. A floor reinforcing member which forms a closed cross section extending in the front-rear direction on the lower surface side of the floor panel in cooperation with the bending portion, and includes a floor reinforcing member provided at a position separated from the rear side frame , and the tie-down hook mounting the reinforcing member is joined over the vicinity of the upper end portion from the lower side curved portion of the vehicle transverse direction outer side portion of the spare tire pan Rutoto Said rear side frame and cooperates with the spare tire pan to a position spaced from the floor reinforcing member to form a closed cross section, wherein the rear end portion of the tie-down hook mounting reinforcing member, between the spare tire pan and the floor reinforcing member the extending portion extending between provided, the extending portion is joined to said floor reinforcing member and the spare tire pan, the floor panel rear end is joined is bent vertically upward to the rear end panel, the extending portion Is extended to the rear end of the floor panel, bent in the same direction as the rear end of the floor panel, and joined to the rear end panel together with the floor panel .

前後方向に延びる閉断面を形成するフロア補強部材を設けたため、後部車体の後突に対する剛性・強度が向上し、後突時の衝突エネルギーをフロア補強部材によっても吸収することができ、衝突エネルギー吸収性能が向上する。タイダウンフック取付補強部材の延出部をフロア補強部材とスペアタイヤパンとに接合することで、スペアタイヤパンとタイダウンフック取付補強部材とフロア補強部材の接合強度が向上するので、タイダウンフックからタイダウンフック取付補強部材に作用する荷重に対する強度を高めることができるうえ、タイダウンフック取付補強部材を有効活用して、フロア補強部材の後端付近の後部車体の剛性・強度を高めることができる。 Since the floor reinforcement member that forms a closed cross section extending in the front-rear direction is provided, the rigidity and strength of the rear car body against the rear impact are improved, and the collision energy at the time of the rear impact can also be absorbed by the floor reinforcement member. Performance is improved. By joining the extension portion of the tie-down hook mounting reinforcement member to the floor reinforcing member and the spare tire pan, the bonding strength of the spare tire pan, tie-down hook mounting reinforcing member, and floor reinforcing member is improved. In addition to increasing the strength against the load acting on the tie-down hook mounting reinforcement member, the tie-down hook mounting reinforcement member can be effectively utilized to increase the rigidity and strength of the rear vehicle body near the rear end of the floor reinforcement member. it can.

請求項２の自動車の後部車体構造は、左右１対のリヤサイドフレームと、下方に凹んだスペアタイヤパンを有するフロアパネルと、タイダウンフック取付補強部材を介してスペアタイヤパンに取付けられるタイダウンフックとを有する自動車の後部車体構造において、前記左右１対のリヤサイドフレームはフロアパネルの下面と協働して前後方向に延びる閉断面を形成し、前記タイダウンフック取付補強部材は、前記スペアタイヤパンの車幅方向外側部の下端側湾曲部から上端部付近に亙って接合されるとともに前記リヤサイドフレームから離隔した位置にスペアタイヤパンと協働して閉断面を形成し、前記タイダウンフック取付補強部材の後端部分には、フロアパネルとリヤサイドフレームとの間に延びる延出部を設け、前記延出部は前記リヤサイドフレームとフロアパネルとに接合され、前記フロアパネル後端は鉛直上方に折曲されてリヤエンドパネルに接合され、前記延出部はフロアパネル後端まで延びるとともに、フロアパネル後端と同方向に折曲されて、フロアパネルとともにリヤエンドパネルに接合されたことを特徴とする。 The rear vehicle body structure according to claim 2 includes a pair of left and right rear side frames, a floor panel having a spare tire pan recessed downward, and a tie-down hook attached to the spare tire pan via a tie-down hook attachment reinforcing member. in the rear body structure of a motor vehicle having the door, rear side frames of the right and left pair to form a closed cross section extending in the longitudinal direction in cooperation with the lower surface of the floor panel, the tie-down hook mounting reinforcing member, the spare tire pan in the vehicle width direction outer side portion lower end is joined over the vicinity of the upper end portion from the curved portion Rutotomoni the cooperation with the spare tire pan to a position spaced from the rear side frame forming a closed cross section, said tie-down hook mounting the rear end portion of the reinforcing member is provided with a extending portion which extends between the floor panel and the rear side frame, the extending portion is the Is joined to the Ya side frame and the floor panel, the floor panel rear end is joined is bent vertically upward to the rear end panel, the extending portion extends to the floor panel rear, floor panel rear in the same direction And is joined to the rear end panel together with the floor panel .

タイダウンフック取付補強部材の延出部をフロアパネルとリヤサイドフレームとに接合することで、スペアタイヤパンとタイダウンフック取付補強部材とフロアパネルとの接合強度が向上するので、タイダウンフックからタイダウンフック取付補強部材に作用する荷重に対する強度を高めることができるうえ、タイダウンフック取付補強部材を有効活用して、リヤサイドフレームの後端付近の後部車体の剛性・強度を高めることができる。 By joining the extension part of the tie-down hook mounting reinforcement member to the floor panel and the rear side frame, the bonding strength between the spare tire pan, the tie-down hook mounting reinforcement member and the floor panel is improved. The strength against the load acting on the down hook mounting reinforcement member can be increased, and the rigidity and strength of the rear vehicle body in the vicinity of the rear end of the rear side frame can be increased by effectively utilizing the tie down hook mounting reinforcement member.

請求項３の自動車の後部車体構造は、請求項１の発明において、前記リヤサイドフレーム又はフロア補強部材の後端に、バンパーに固定されたクラッシュカンが、クラッシュカン前端に接合されたフランジ板と締結部材を介して連結され、フロアパネル後端とタイダウンフック取付補強部材の後端を車室内側に向けて上方へ折曲させるとともに、タイダウンフック取付補強部材の後端の一部を車室外側に向けて下方へ折曲させて前記フランジ板に締結したことを特徴とする。 According to a third aspect of the present invention, there is provided a rear body structure of the vehicle according to the first aspect , wherein a crush can fixed to a bumper is fastened to a rear end of the rear side frame or the floor reinforcing member with a flange plate joined to the front end of the crush can. The rear end of the floor panel and the rear end of the tie-down hook mounting reinforcing member are bent upward toward the vehicle interior side, and a part of the rear end of the tie-down hook mounting reinforcing member is connected to the vehicle interior. It is characterized in that it is bent downward toward the outside and fastened to the flange plate .

請求項４の自動車の後部車体構造は、請求項２の発明において、前記リヤサイドフレームの後端に、バンパーに固定されたクラッシュカンが、クラッシュカン前端に接合されたフランジ板と締結部材を介して連結され、フロアパネル後端とタイダウンフック取付補強部材の後端を車室内側に向けて上方へ折曲させるとともに、タイダウンフック取付補強部材の後端の一部を車室外側に向けて下方へ折曲させて前記フランジ板に締結したことを特徴とする。 Rear body structure of an automotive vehicle according to claim 4 is the invention of claim 2, the rear end of the rear side frames, crash cans that is fixed to the bumper, via the flange plate and the fastening member joined to the crush can front end The rear end of the floor panel and the rear end of the tie-down hook mounting reinforcement member are bent upward toward the vehicle interior side, and a part of the rear end of the tie-down hook mounting reinforcement member is directed outward of the vehicle interior. And bent downward and fastened to the flange plate.

請求項１の発明によれば、スペアタイヤパンと協働して前後方向に延びる閉断面を形成するフロア補強部材を設けたので、後部車体の後突に対する剛性・強度が向上する。スペアタイヤパンとフロア補強部材とで形成される閉断面をリヤサイドフレームと略同じ高さ位置に設けることができ、後突時にバンパービームから伝達される衝突荷重をリヤサイドフレームとフロア補強部材で効果的に受け止めることで、後突時の衝突エネルギーを左右のリヤサイドフレームの圧縮変形とフロア補強部材の圧縮変形とで吸収させることができるため、衝突エネルギーを吸収する吸収性能が向上する。 According to the first aspect of the present invention, since the floor reinforcing member that forms a closed cross section extending in the front-rear direction in cooperation with the spare tire pan is provided, the rigidity and strength of the rear vehicle body against the rear collision are improved. The closed cross section formed by the spare tire pan and the floor reinforcing member can be provided at almost the same height as the rear side frame, and the collision load transmitted from the bumper beam at the time of rear collision is effective with the rear side frame and the floor reinforcing member. Since the collision energy at the time of rear collision can be absorbed by the compression deformation of the left and right rear side frames and the compression deformation of the floor reinforcing member, the absorption performance for absorbing the collision energy is improved.

しかも、タイダウンフック取付補強部材の後端部には延出部を設け、この延出部をフロア補強部材とスペアタイヤパンとに接合したので、スペアタイヤパンとタイダウンフック取付補強部材とフロア補強部材の接合強度が向上するので、タイダウンフックからタイダウンフック取付補強部材に作用する荷重に対する強度を高めることができるうえ、タイダウンフック取付補強部材を有効活用して、部品数を増すことなく、フロア補強部材の後端付近の後部車体の剛性・強度を高めることができ、圧縮変形する際における閉断面の断面崩れを防止でき、衝突エネルギーの吸収性能が低下することもない。更に、フロアパネル後端は鉛直上方に折曲されてリヤエンドパネルに接合され、タイダウンフック取付補強部材の延出部はフロアパネル後端まで延び、フロアパネル後端と同方向に折曲されて、フロアパネルとともにリヤエンドパネルに接合されたので、フロアパネルと上記延出部との接合強度が高まる。 In addition, since an extension is provided at the rear end of the tie-down hook mounting reinforcement member, and this extension is joined to the floor reinforcement member and the spare tire pan, the spare tire pan, the tie-down hook attachment reinforcement member, and the floor Since the joint strength of the reinforcing member is improved, the strength against the load acting from the tie-down hook to the tie-down hook mounting reinforcement member can be increased, and the number of parts can be increased by effectively utilizing the tie-down hook mounting reinforcing member. In addition, the rigidity and strength of the rear vehicle body in the vicinity of the rear end of the floor reinforcing member can be increased, the collapse of the cross section of the closed cross section during compression deformation can be prevented, and the impact energy absorption performance is not lowered. Further, the rear end of the floor panel is bent vertically upward and joined to the rear end panel, and the extension portion of the tie-down hook mounting reinforcing member extends to the rear end of the floor panel and is bent in the same direction as the rear end of the floor panel. Since it is joined to the rear end panel together with the floor panel, the joining strength between the floor panel and the extending portion is increased.

請求項２の発明によれば、タイダウンフック取付補強部材の延出部をフロアパネルとリヤサイドフレームとに接合することで、スペアタイヤパンとタイダウンフック取付補強部材とフロアパネルとの接合強度が向上するので、タイダウンフックからタイダウンフック取付補強部材に作用する荷重に対する強度を高めることができるうえ、タイダウンフック取付補強部材を有効活用して、部品数を増すことなく、リヤサイドフレームの後端付近の後部車体の剛性・強度を高めることができ、圧縮変形する際における閉断面の断面崩れを防止でき、衝突エネルギーの吸収性能が低下することもない。また、フロアパネル後端は鉛直上方に折曲されてリヤエンドパネルに接合され、タイダウンフック取付補強部材の延出部はフロアパネル後端まで延び、フロアパネル後端と同方向に折曲されて、フロアパネルとともにリヤエンドパネルに接合されたので、フロアパネルと上記延出部との接合強度が高まる。 According to the invention of claim 2, the joining strength of the spare tire pan, the tie-down hook attachment reinforcing member, and the floor panel is obtained by joining the extension portion of the tie-down hook attachment reinforcement member to the floor panel and the rear side frame. As a result, the strength against the load acting on the tie-down hook mounting reinforcement member from the tie-down hook can be increased, and the tie-down hook mounting reinforcement member can be used effectively to increase the number of parts without increasing the number of parts. The rigidity and strength of the rear vehicle body near the end can be increased, the collapse of the closed cross section during compression deformation can be prevented, and the collision energy absorption performance is not lowered. Also, the rear end of the floor panel is bent vertically upward and joined to the rear end panel, and the extension part of the tie-down hook mounting reinforcement member extends to the rear end of the floor panel and is bent in the same direction as the rear end of the floor panel. Since it is joined to the rear end panel together with the floor panel, the joining strength between the floor panel and the extending portion is increased.

請求項３の発明によれば、リヤサイドフレーム又はフロア補強部材の後端に、バンパーに固定されたクラッシュカンが、クラッシュカン前端に接合されたフランジ板と締結部材を介して連結され、フロアパネル後端とタイダウンフック取付補強部材の後端を車室内側に向けて上方へ折曲させるとともに、タイダウンフック取付補強部材の後端の一部を車室外側に向けて下方へ折曲させて上記フランジ板に締結したので、部品数を増すことなく、タイダウンフック取付補強部材の後端の接合強度を高めることができる。 According to the invention of claim 3, the crush can fixed to the bumper is connected to the rear end of the rear side frame or the floor reinforcing member via the flange plate joined to the front end of the crush can and the fastening member. Bend the end and the rear end of the tie-down hook mounting reinforcement member toward the vehicle interior side, and bend a part of the rear end of the tie-down hook mounting reinforcement member downward toward the vehicle interior side. Since it fastened to the flange plate, the joining strength of the rear end of the tie-down hook mounting reinforcing member can be increased without increasing the number of parts.

請求項４の発明によれば、リヤサイドフレームの後端に、バンパーに固定されたクラッシュカンが、クラッシュカン前端に接合されたフランジ板と締結部材を介して連結され、フロアパネル後端とタイダウンフック取付補強部材の後端を車室内側に向けて上方へ折曲させるとともに、タイダウンフック取付補強部材の後端の一部を車室外側に向けて下方へ折曲させて上記フランジ板に締結したので、部品数を増すことなく、タイダウンフック取付補強部材の後端の接合強度を高めることができる。 According to the invention of claim 4, the rear end of the rear side frames, crash cans that is fixed to the bumper, is connected via a fastening member and a flange plate which is joined to the crush can front end, the floor panel rear and Thailand The flange plate is formed by bending the rear end of the down hook attachment reinforcing member upward toward the vehicle interior side and bending a part of the rear end of the tie down hook attachment reinforcement member downward toward the vehicle compartment outer side. Thus, the joining strength of the rear end of the tie-down hook mounting reinforcing member can be increased without increasing the number of components.

本発明の自動車の後部車体構造は、左右１対のリヤサイドフレームと、下方に凹んだスペアタイヤパンを有するフロアパネルと、タイダウンフック取付補強部材を介してスペアタイヤパンに取付けられるタイダウンフックとを有する自動車の後部車体構造において、左右１対のリヤサイドフレームはフロアパネルの下面と協働して前後方向に延びる閉断面を形成し、スペアタイヤパンの車幅方向外側部の上端側湾曲部と協働してフロアパネルの下面側に前後方向に延びる閉断面を形成するフロア補強部材であって、リヤサイドフレームから離隔した位置に設けられたフロア補強部材を備え、前記タイダウンフック取付補強部材は、スペアタイヤパンの車幅方向外側部の下端側湾曲部から上端部付近に亙って接合されるとともにリヤサイドフレームとフロア補強部材から離隔した位置にスペアタイヤパンと協働して閉断面を形成し、タイダウンフック取付補強部材の後端部分には、スペアタイヤパンとフロア補強部材との間に延びる延出部を設け、延出部はフロア補強部材とスペアタイヤパンとに接合され、フロアパネル後端は鉛直上方に折曲されてリヤエンドパネルに接合され、延出部はフロアパネル後端まで延びるとともに、フロアパネル後端と同方向に折曲されて、フロアパネルとともにリヤエンドパネルに接合されたものである。 The rear vehicle body structure of the present invention includes a pair of left and right rear side frames, a floor panel having a spare tire pan recessed downward, and a tie-down hook attached to the spare tire pan via a tie-down hook attachment reinforcing member. The pair of left and right rear side frames cooperates with the lower surface of the floor panel to form a closed cross section extending in the front-rear direction, and the upper end side curved portion of the outer portion in the vehicle width direction of the spare tire pan. A floor reinforcing member that cooperates to form a closed cross section extending in the front-rear direction on the lower surface side of the floor panel, the floor reinforcing member provided at a position separated from the rear side frame , the tie-down hook mounting reinforcing member is It is joined over the vicinity of the upper end portion from the lower side curved portion in the vehicle width direction outer side portion of the spare tire pan Rutotomoni Riyasaidofure In cooperation with the spare tire pan to a position spaced from the beam and the floor reinforcing member to form a closed surface, the rear end portion of the tie-down hook mounting reinforcing members, extending extending between the spare tire pan and the floor reinforcing member An extension is provided, the extension is joined to the floor reinforcing member and the spare tire pan, the rear end of the floor panel is bent vertically upward and joined to the rear end panel, and the extension extends to the rear end of the floor panel. It is bent in the same direction as the rear end of the floor panel and joined to the rear end panel together with the floor panel .

以下、本発明の実施例について図面に基づいて説明する。
図１はバンパービーム１１を取り除いた状態の後部車体の底面斜視図であり、図２は後部車体の底面図であり、図３はリヤエンドパネル２と後述のフランジ板１２とそれらの後側部分を取り除いた後部車体の背面図である。図７は、図２からリヤエンドパネル２とフランジ板１２とフロア補強部材８とそれらの後側部分を取り除いた後部車体の底面図である。 Embodiments of the present invention will be described below with reference to the drawings.
1 is a bottom perspective view of a rear vehicle body with the bumper beam 11 removed, FIG. 2 is a bottom view of the rear vehicle body, and FIG. 3 shows a rear end panel 2, a flange plate 12 to be described later, and rear portions thereof. FIG. 6 is a rear view of the removed rear vehicle body. FIG. 7 is a bottom view of the rear vehicle body from which the rear end panel 2, the flange plate 12, the floor reinforcing member 8, and their rear portions are removed from FIG. 2.

図１〜図６に示すように、自動車の後部車体構造には、フロアパネル１と、リヤエンドパネル２と、フロアパネル１から下方に凹んだスペアタイヤパン３と、２つのタイダウンフック４及びタイダウンフック取付補強部材５と、クロスメンバ６と、前後方向に延びる１対のリヤサイドフレーム７と、スペアタイヤパン３と協働して閉断面を形成する１対のフロア補強部材８と、１対の第１クラッシュカン９と、１対の第２クラッシュカン１０と、バンパービーム１１などが設けられている。 As shown in FIGS. 1 to 6, the rear body structure of an automobile includes a floor panel 1, a rear end panel 2, a spare tire pan 3 recessed downward from the floor panel 1, two tie-down hooks 4 and a tie. Down hook mounting reinforcing member 5, cross member 6, a pair of rear side frames 7 extending in the front-rear direction, a pair of floor reinforcing members 8 forming a closed cross-section in cooperation with spare tire pan 3, and a pair The first crush can 9, a pair of second crush cans 10, a bumper beam 11, and the like are provided.

図１〜図６に示すように、フロアパネル１の後端部分には、下方に凹ませて形成された平面視にて前後にやや細長い長円状のスペアタイヤパン３が設けられ、スペアタイヤパン３の下部には緩く湾曲した平面視ほぼ長円状の下部湾曲部３ａが形成され、スペアタイヤパン３の上端近傍部には急湾曲状の平面視ほぼ長円状の上端側湾曲部３ｂが形成されている。 As shown in FIGS. 1 to 6, the rear end portion of the floor panel 1 is provided with a spare tire pan 3 that is slightly elongated in the front and rear in a plan view formed by being recessed downward, and is used as a spare tire. A lower curved portion 3 a that is gently curved in plan view is formed in the lower portion of the pan 3, and an upper end side curved portion 3 b that is substantially oval in plan view in plan view is formed in the vicinity of the upper end of the spare tire pan 3. Is formed.

フロアパネル１の下面側においてスペアタイヤパン３の前側には、車幅方向に延びるクロスメンバ６が接合され、そのクロスメンバ６はフロアパネル１と協働して車幅方向に延びる閉断面を形成し、クロスメンバ６の両端部は左右のリヤサイドフレーム７に接合されている。フロアパネル１の後端部は鉛直上方、つまり、車室内側に向けて折曲され、フロアパネル１の後端部には、車幅方向に延びるリヤエンドパネル２が立設され、このリヤエンドパネル２の上端部には閉断面部２ａが形成されている。 A cross member 6 extending in the vehicle width direction is joined to the front side of the spare tire pan 3 on the lower surface side of the floor panel 1, and the cross member 6 forms a closed cross section extending in the vehicle width direction in cooperation with the floor panel 1. Both ends of the cross member 6 are joined to the left and right rear side frames 7. The rear end portion of the floor panel 1 is bent vertically upward, that is, toward the vehicle interior side, and a rear end panel 2 extending in the vehicle width direction is erected at the rear end portion of the floor panel 1. A closed cross-sectional portion 2a is formed at the upper end portion.

次に、リヤサイドフレーム７について説明する。
図１、図２、図４、図６に示すように、フロアパネル１の左右両端寄り部分には、前後方向に延びる左右１対のリヤサイドフレーム７が夫々配設されている。リヤサイドフレーム７はフロアパネル１の下面と協働して前後方向に延びる閉断面を形成している。 Next, the rear side frame 7 will be described.
As shown in FIGS. 1, 2, 4, and 6, a pair of left and right rear side frames 7 extending in the front-rear direction are disposed at portions near the left and right ends of the floor panel 1. The rear side frame 7 forms a closed cross section extending in the front-rear direction in cooperation with the lower surface of the floor panel 1.

フロアパネル１の下面側において、スペアタイヤパン３の左右の車幅方向外側近傍部には、前後方向に延びる左右１対のフロア補強部材８が設けられている。フロア補強部材８は、断面ほぼＬ字形の部材に接合フランジを形成した部材であり、リヤサイドフレーム７から車幅方向内側へ離隔した位置に設けられ、フロアパネル１と協働してリヤサイドフレーム７と平行に前後方向に延びる閉断面を形成する。フロア補強部材８は、スペアタイヤパン３における車幅方向外側部の上端側湾曲部３ｂと協働して閉断面を形成し、この閉断面はリヤサイドフレーム７と略同じ高さ位置に設けられている。 On the lower surface side of the floor panel 1, a pair of left and right floor reinforcing members 8 extending in the front-rear direction are provided in the left and right vehicle width direction outer vicinity portions of the spare tire pan 3. The floor reinforcing member 8 is a member in which a joining flange is formed on a member having an approximately L-shaped cross section. The floor reinforcing member 8 is provided at a position separated from the rear side frame 7 inward in the vehicle width direction. A closed section extending in the front-rear direction is formed in parallel. The floor reinforcing member 8 forms a closed cross section in cooperation with the upper end side curved portion 3b of the spare tire pan 3 on the outer side in the vehicle width direction. The closed cross section is provided at substantially the same height as the rear side frame 7. Yes.

車体の左右両側の各々において、リヤサイドフレーム７の後端にはフランジ板１２を介して第１クラッシュカン９が固定され、フロア補強部材８の後端には上記と共通のフランジ板１２を介して第２クラッシュカン１０が固定され、左右１対の第１クラッシュカン９の後端と左右１対の第２クラッシュカン１０の後端には、車幅方向に延びる閉断面構造のバンパービーム１１が固定されている。 On each of the left and right sides of the vehicle body, a first crash can 9 is fixed to the rear end of the rear side frame 7 via a flange plate 12, and the rear end of the floor reinforcing member 8 is connected to a flange plate 12 common to the above. The second crash can 10 is fixed, and a bumper beam 11 having a closed cross-sectional structure extending in the vehicle width direction is provided at the rear end of the pair of left and right first crash cans 9 and the rear end of the pair of left and right second crash cans 10. It is fixed.

バンパービーム１１の製作時に、バンパービーム１１に左右１対の第１クラッシュカン９と左右１対の第２クラッシュカン１０が接合され、車体左側の第１，第２クラッシュカン９，１０の前端に共通の平板状のフランジ板１２が接合されると共に、車体右側の第１，第２クラッシュカン９，１０の前端に共通の平板状のフランジ板１２が接合される。 When the bumper beam 11 is manufactured, a pair of left and right first crash cans 9 and a pair of left and right second crash cans 10 are joined to the bumper beam 11 and are connected to the front ends of the first and second crash cans 9 and 10 on the left side of the vehicle body. A common flat flange plate 12 is joined, and a common flat flange plate 12 is joined to the front ends of the first and second crash cans 9 and 10 on the right side of the vehicle body.

１対のリヤサイドフレーム７の後半部は高張力鋼板で構成され、前半部は普通鋼板で構成されている。図３に示すように、リヤサイドフレーム７の後端部には、直角状に折曲されて左右両側と下側に張出す第１フランジ部１３，１４，１５が形成され、第１フランジ部１３，１４，１５は、それらのボルト穴１３ａ，１４ａ，１５ａとフランジ板１２に形成された対応する３つのボルト穴とに後方からボルト（締結部材）１７，１８，１９を挿通して前側からナットを締結することで、フランジ板１２にボルト結合されている。このように、リヤサイドフレーム７の後端にフランジ板１２を介在させた状態で第１クラッシュカン９の前端が固着され、この第１クラッシュカン９の後端にバンパービーム１１が固着されている。 The rear half of the pair of rear side frames 7 is made of a high-strength steel plate, and the front half is made of a normal steel plate. As shown in FIG. 3, the rear end portion of the rear side frame 7 is formed with first flange portions 13, 14, 15 that are bent at right angles and project to the left and right sides and the lower side. , 14, and 15 are bolts (fastening members) 17, 18, 19 from the rear through the bolt holes 13 a, 14 a, 15 a and the corresponding three bolt holes formed in the flange plate 12, and nuts from the front side. Is fastened to the flange plate 12 by bolts. Thus, the front end of the first crash can 9 is fixed with the flange plate 12 interposed at the rear end of the rear side frame 7, and the bumper beam 11 is fixed to the rear end of the first crash can 9.

フロアパネル１の下面側において、スペアタイヤパン３の車幅方向外側近傍部には、前後方向に延びる左右１対のフロア補強部材８が配設されている。フロア補強部材８は、スペアタイヤパン３における車幅方向外側部の上端側湾曲部３ｂと協働してリヤサイドフレーム７と平行に前後方向に延びる閉断面を形成しており、この閉断面はリヤサイドフレーム７と略同じ高さ位置になるように設けられている。フロア補強部材８の前端部は、クロスメンバ６及びそのフランジとフロアパネル１に接合されている。 On the lower surface side of the floor panel 1, a pair of left and right floor reinforcing members 8 extending in the front-rear direction are disposed in the vicinity of the outer side in the vehicle width direction of the spare tire pan 3. The floor reinforcing member 8 forms a closed cross section extending in the front-rear direction in parallel with the rear side frame 7 in cooperation with the upper end side curved portion 3b of the outer portion in the vehicle width direction of the spare tire pan 3. It is provided so as to be at substantially the same height as the frame 7. The front end portion of the floor reinforcing member 8 is joined to the cross member 6 and its flange and the floor panel 1.

図３に示すように、フロア補強部材８の後端部には、直角状に折曲されて車幅方向外側に張出す第２フランジ部１６が形成され、第２フランジ部１６は第１フランジ部１４の前面に重ねられ、第１フランジ部１４と同様にボルトによりフランジ板１２に締結されている。このように、フロア補強部材８の後端にフランジ板１２を介在させた状態で第２クラッシュカン１０の前端が固着され、第２クラッシュカン１０の後端にバンパービーム１１が固着されている。 As shown in FIG. 3, the rear end portion of the floor reinforcing member 8 is formed with a second flange portion 16 that is bent at a right angle and extends outward in the vehicle width direction. The second flange portion 16 is a first flange. Like the first flange portion 14, it is overlapped on the front surface of the portion 14 and fastened to the flange plate 12 with bolts. As described above, the front end of the second crash can 10 is fixed with the flange plate 12 interposed at the rear end of the floor reinforcing member 8, and the bumper beam 11 is fixed to the rear end of the second crash can 10.

図１、図２、図４に示すように、第１クラッシュカン９は、後突時にバンパービーム１１から作用する衝突荷重により圧縮変形して潰れることで衝突エネルギーを吸収し、所期のエネルギー吸収機能を達成し得るサイズ、形状、構造に構成されている。第２クラッシュカン１０も、後突時にバンパービーム１１から作用する衝突荷重により圧縮変形して潰れることで衝突エネルギーを吸収するものである。第２クラッシュカン１０の車幅方向の幅は、第１クラッシュカン９の車幅方向の幅の略半分に構成されている。 As shown in FIGS. 1, 2, and 4, the first crush can 9 absorbs collision energy by being compressed and deformed by a collision load acting from the bumper beam 11 at the time of a rear collision, thereby absorbing the desired energy. It is configured in a size, shape, and structure that can achieve its functions. The second crash can 10 also absorbs collision energy by being compressed and deformed by a collision load acting from the bumper beam 11 at the time of rear collision. The width of the second crash can 10 in the vehicle width direction is configured to be approximately half the width of the first crash can 9 in the vehicle width direction.

フランジ板１２は、第１，第２クラッシュカン９，１０の後端部に対して上下左右に張出す鉛直板状のもので、第１，第２クラッシュカン９，１０の車幅方向の幅よりも広幅に形成されている。フランジ板１２には、タイダウンフック取付補強部材５とリヤサイドフレーム７とフロア補強部材８とを接続する為の５つのボルト穴が形成されている。 The flange plate 12 is a vertical plate that projects vertically and horizontally with respect to the rear ends of the first and second crash cans 9 and 10, and the width of the first and second crash cans 9 and 10 in the vehicle width direction. It is formed wider than. The flange plate 12 is formed with five bolt holes for connecting the tie-down hook attachment reinforcing member 5, the rear side frame 7, and the floor reinforcing member 8.

スペアタイヤパン３の左部と右部において、夫々、スペアタイヤパン３の車幅方向外側部の下端側湾曲部から上端部分に亙って、スペアタイヤパン３と協働して平面視ほぼ三角形状の閉断面を形成するタイダウンフック取付補強部材５が接合され、タイダウンフック取付補強部材５には、タイダウンフック４が溶接接合されている。タイダウンフック取付補強部材５とスペアタイヤパン３により形成された閉断面は、リヤサイドフレーム７から車幅方向内側且つ上下方向下側へ離隔するとともにフロア補強部材８から車幅方向内側且つ上下方向下側へ離隔する位置に形成されている。
図２、図７、図８に示すように、タイダウンフック取付補強部材５の後端部分には車幅方向外側に湾曲状に張出す延出部２０が設けられている。タイダウンフック取付補強部材５の外周部の接合フランジ５ａは、スペアタイヤパン３の外表面に接合されており、延出部２０は、スペアタイヤパン３の車幅方向外側部の上端側湾曲部３ｂに密着する形状に形成されている。延出部２０は、スペアタイヤパン３とフロア補強部材８との間に延出されてフロア補強部材８とスペアタイヤパン３とに接合されている。 In the left and right portions of the spare tire pan 3, respectively, the triangular shape in plan view in cooperation with the spare tire pan 3 extends from the lower end side curved portion of the spare tire pan 3 outside in the vehicle width direction to the upper end portion. A tie-down hook attachment reinforcing member 5 that forms a closed cross section of the shape is joined, and the tie-down hook 4 is welded to the tie-down hook attachment reinforcement member 5. The closed cross section formed by the tie-down hook mounting reinforcing member 5 and the spare tire pan 3 is separated from the rear side frame 7 in the vehicle width direction inner side and in the vertical direction lower side, and from the floor reinforcing member 8 in the vehicle width direction inner side and in the vertical direction lower side. It is formed at a position separated to the side.
As shown in FIGS. 2, 7, and 8, the rear end portion of the tie-down hook attachment reinforcing member 5 is provided with an extending portion 20 that projects in a curved shape outward in the vehicle width direction. The joining flange 5a at the outer peripheral portion of the tie-down hook mounting reinforcing member 5 is joined to the outer surface of the spare tire pan 3, and the extended portion 20 is an upper end side curved portion at the outer side in the vehicle width direction of the spare tire pan 3. It is formed in a shape that is in close contact with 3b. The extending portion 20 extends between the spare tire pan 3 and the floor reinforcing member 8 and is joined to the floor reinforcing member 8 and the spare tire pan 3.

図１、図３、図４、図８に示すように、延出部２０の後端部には、フロアパネル１の後端まで延びて、車室内側に向けて上方へ折曲されたフランジ部２３が設けられ、フロアパネル１とリヤエンドパネル２との間にフランジ部２３を挟み込んでフロアパネル１とともにリヤエンドパネル２に接合されている。 As shown in FIGS. 1, 3, 4, and 8, a flange that extends to the rear end of the floor panel 1 and is bent upward toward the vehicle interior side at the rear end portion of the extension portion 20. A portion 23 is provided, and the flange portion 23 is sandwiched between the floor panel 1 and the rear end panel 2 and joined to the rear end panel 2 together with the floor panel 1.

延出部２０のうちの車幅方向やや内側の部位には、車室外側に向けて下方へ折曲されたフランジ部２１が設けられ、このフランジ部２１はフランジ板１２にボルト結合するためのボルト穴２１ａが形成され、フランジ部２１はボルト２２によりフランジ板１２に連結されている。フランジ部２１のやや車幅方向内側の部位には、車室内側に向けて上方へ折曲されたフランジ部２４が設けられ、スペアタイヤパン３の後端のフランジ部と共にリヤエンドパネル２に接合されている。 A flange portion 21 that is bent downward toward the outside of the passenger compartment is provided in a portion of the extension portion 20 that is slightly in the vehicle width direction, and this flange portion 21 is bolted to the flange plate 12. Bolt holes 21 a are formed, and the flange portion 21 is connected to the flange plate 12 by bolts 22. A flange portion 24 that is bent upward toward the vehicle interior side is provided at a portion slightly inward in the vehicle width direction of the flange portion 21, and is joined to the rear end panel 2 together with the flange portion at the rear end of the spare tire pan 3. ing.

次に、以上説明した自動車の後部車体構造の作用、効果について説明する。
フロア補強部材８とスペアタイヤパン３とで前後方向に延びる閉断面をリヤサイドフレーム７とほぼ同じ高さ位置に形成し、第２クラッシュカン１０を介してバンパービーム１１に連結したので、後部車体の後突に対する剛性・強度を高め、後突時には上記の閉断面が圧縮変形により潰れることで、衝突エネルギー吸収性能を高めることができる。 Next, functions and effects of the rear vehicle body structure described above will be described.
Since the floor reinforcing member 8 and the spare tire pan 3 have a closed cross section extending in the front-rear direction at substantially the same height as the rear side frame 7 and connected to the bumper beam 11 via the second crash can 10, The rigidity and strength with respect to the rear impact can be increased, and the collision energy absorption performance can be improved by collapsing the closed cross section due to compressive deformation during the rear impact.

タイダウンフック取付補強部材５の後端部分に延出部２０を設け、この延出部２０をフロア補強部材８とスペアタイヤパン３とに接合することで、タイダウンフック取付補強部材５とフロア補強部材８とスペアタイヤパン３の接合強度が高まるので、タイダウンフック取付補強部材５にタイダウンフック４から作用する荷重に対する支持強度も高まるうえ、タイダウンフック取付補強部材５を有効活用して、部品数を増すことなく、フロア補強部８の後端付近の後部車体の剛性・強度を高めることができる。 The extension portion 20 is provided at the rear end portion of the tie-down hook attachment reinforcing member 5, and the extension portion 20 is joined to the floor reinforcement member 8 and the spare tire pan 3, so that the tie-down hook attachment reinforcement member 5 and the floor are joined. Since the joining strength between the reinforcing member 8 and the spare tire pan 3 is increased, the support strength against the load acting on the tie-down hook mounting reinforcing member 5 from the tie-down hook 4 is increased, and the tie-down hook mounting reinforcing member 5 is effectively utilized. Without increasing the number of parts, the rigidity and strength of the rear vehicle body in the vicinity of the rear end of the floor reinforcing portion 8 can be increased.

前記のタイダウンフック取付補強部材５の延出部２０により、フロア補強部材８の後端部分の強度・剛性を高めたので、後突時、フロア補強部材８が圧縮変形する際に閉断面の断面崩れを防止でき、衝突エネルギーの吸収性能が低下することもない。 The extension portion 20 of the tie-down hook attachment reinforcing member 5 increases the strength and rigidity of the rear end portion of the floor reinforcing member 8. The cross-section can be prevented from collapsing, and the collision energy absorption performance is not lowered.

フロアパネル１の後端は鉛直上方に折曲されてリヤエンドパネル２に接合され、延出部２０はフロアパネル１の後端まで延びるとともに、フロアパネル１の後端と同方向に折曲されて、フロアパネル１とともにリヤエンドパネル２に接合されたので、フロアパネル１とタイダウンフック取付補強部材５の延出部２０とリヤエンドパネル２との接合強度が高まる。 The rear end of the floor panel 1 is bent vertically upward and joined to the rear end panel 2, and the extending portion 20 extends to the rear end of the floor panel 1 and is bent in the same direction as the rear end of the floor panel 1. Since the floor panel 1 and the rear end panel 2 are joined together, the joining strength between the floor panel 1 and the extended portion 20 of the tie-down hook attachment reinforcing member 5 and the rear end panel 2 is increased.

リヤサイドフレーム７の後端とフロア補強部材８の後端に、バンパービーム１１に固定された第１、第２クラッシュカン９，１０がフランジ板１２を介して連結され、フロアパネル１の後端とタイダウンフック取付補強部材５の後端のフランジ部２３を車室内側に向けて上方へ折曲させるとともに、タイダウンフック取付補強部材５の後端の一部を車室外側に向けて下方へ折曲させたフランジ部２１をフランジ板１２に締結するので、部品数を増すことなく、タイダウンフック取付補強部材５の後端の接合強度を高めることができる。 First and second crush cans 9 and 10 fixed to a bumper beam 11 are connected to a rear end of the rear side frame 7 and a rear end of the floor reinforcing member 8 via a flange plate 12. The flange portion 23 at the rear end of the tie-down hook attachment reinforcing member 5 is bent upward toward the vehicle interior side, and a part of the rear end of the tie-down hook attachment reinforcement member 5 is directed downward toward the vehicle compartment outside. Since the bent flange portion 21 is fastened to the flange plate 12, the joining strength of the rear end of the tie-down hook attachment reinforcing member 5 can be increased without increasing the number of components.

次に、前記実施例を部分的に変更した変更例について説明する。
１］タイダウンフック取付補強部材５の延出部２０を、フロアパネル１とリヤサイドフレーム７との間に延出するように構成し、この延出部２０をフロア補強部材８とスペアタイヤパン３とリヤサイドフレーム７とフロアパネル１に接合してもよい。 Next, a modified example in which the above embodiment is partially modified will be described.
1] The extending portion 20 of the tie-down hook attachment reinforcing member 5 is configured to extend between the floor panel 1 and the rear side frame 7, and the extending portion 20 is configured as the floor reinforcing member 8 and the spare tire pan 3. Alternatively, the rear side frame 7 and the floor panel 1 may be joined.

２］図９に示すように、スペアタイヤパン３の左右の車幅方向外側近傍部に設けたフロア補強部材８を省略し、タイダウンフック取付補強部材５をスペアタイヤパン３の左右の車幅方向外側部の下端側湾曲部から上端部付近に亙って接合するとともにリヤサイドフレーム７から車幅方向内側へ離隔した位置に閉断面を形成するよう構成するとともに、タイダウンフック取付補強部材５の延出部２０Ａをフロアパネル１とリヤサイドフレーム７との間まで延出させ、延出部２０Ａをスペアタイヤパン３とリヤサイドフレーム７とフロアパネル１に接合してもよい。 2] As shown in FIG. 9, the floor reinforcing member 8 provided in the left and right vehicle width direction outer vicinity of the spare tire pan 3 is omitted, and the tie-down hook mounting reinforcing member 5 is replaced with the left and right vehicle widths of the spare tire pan 3. The tie-down hook attachment reinforcing member 5 is constructed so as to be joined from the lower end side curved portion of the outer side portion in the vicinity of the upper end portion and to form a closed cross section at a position spaced inward in the vehicle width direction from the rear side frame 7 . The extending portion 20A may be extended to between the floor panel 1 and the rear side frame 7, and the extending portion 20A may be joined to the spare tire pan 3, the rear side frame 7, and the floor panel 1.

その場合、タイダウンフック取付補強部材５の延出部２０Ａを有効活用して、部品数を増すことなく、リヤサイドフレーム７の後端部付近の後部車体の剛性・強度を高めることができるうえ、タイダウンフック取付補強部材５の強度を高めることもできる。
３〕その他、当業者であれば、本発明の趣旨を逸脱することなく、前記実施例に種々の変更を付加した形態で実施可能で、本発明はそのような変更形態も包含するものである。 In that case, the extension part 20A of the tie-down hook attachment reinforcing member 5 can be effectively used to increase the rigidity and strength of the rear vehicle body near the rear end of the rear side frame 7 without increasing the number of parts. The strength of the tie-down hook attachment reinforcing member 5 can also be increased.
3) In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. .

本発明の実施例に係る自動車の後部車体構造の要部の底面斜視図である。It is a bottom perspective view of the principal part of the rear body structure of an automobile according to an embodiment of the present invention. 前記後部車体構造の底面図である。It is a bottom view of the rear body structure. 前記後部車体構造における要部の背面図である。It is a rear view of the principal part in the said rear body structure. 図２のIV−IV線断面図である。It is the IV-IV sectional view taken on the line of FIG. 図２のV −V 線断面図である。It is the VV sectional view taken on the line of FIG. 図２のVI−VI線断面図である。It is the VI-VI sectional view taken on the line of FIG. 前記後部車体構造における要部の底面図である。It is a bottom view of the principal part in the said rear body structure. 車体左側のタイダウンフック取付補強部材等の底面斜視図である。It is a bottom perspective view of a tie-down hook attachment reinforcing member on the left side of the vehicle body. 変形例の図２相当図である。FIG. 3 is a diagram corresponding to FIG. 2 of a modification.

１フロアパネル
３スペアタイヤパン
４タイダウンフック
５タイダウンフック取付補強部材
７リヤサイドフレーム
８フロア補強部材
９第１クラッシュカン
１０第２クラッシュカン
１１バンパービーム
１２フランジ板
１７，１８，１９ボルト
２０延出部 DESCRIPTION OF SYMBOLS 1 Floor panel 3 Spare tire pan 4 Tie-down hook 5 Tie-down hook attachment reinforcement member 7 Rear side frame 8 Floor reinforcement member 9 1st crash can 10 2nd crash can 11 Bumper beam 12 Flange board 17, 18, 19 Bolt 20 Extension Part

Claims

In a rear vehicle body structure having a pair of left and right rear side frames, a floor panel having a spare tire pan recessed downward, and a tie down hook attached to the spare tire pan through a tie down hook attachment reinforcing member,
The pair of left and right rear side frames cooperate with the lower surface of the floor panel to form a closed cross section extending in the front-rear direction,
A floor reinforcing member that forms a closed cross section extending in the front-rear direction on the lower surface side of the floor panel in cooperation with the upper-end-side curved portion of the spare tire pan in the vehicle width direction outer side, at a position separated from the rear side frame Provided with floor reinforcement members provided,
The tie-down hook mounting reinforcing member, the spare tire to the remote from the spare tire pan is joined over the vicinity of the upper end portion from the lower side curved portion of the vehicle transverse direction outer side portion Rutotomoni the rear side frame and the floor reinforcing member located In cooperation with bread to form a closed section ,
The rear end portion of the tie-down hook mounting reinforcing member is provided with an extending portion extending between the spare tire pan and the floor reinforcing member,
The extending portion is joined to said floor reinforcing member and the spare tire pan,
The rear end of the floor panel is bent vertically upward and joined to the rear end panel,
A rear body structure of an automobile, wherein the extension portion extends to the rear end of the floor panel, is bent in the same direction as the rear end of the floor panel, and is joined to the rear end panel together with the floor panel .

In a rear vehicle body structure having a pair of left and right rear side frames, a floor panel having a spare tire pan recessed downward, and a tie down hook attached to the spare tire pan through a tie down hook attachment reinforcing member,
The pair of left and right rear side frames cooperate with the lower surface of the floor panel to form a closed cross section extending in the front-rear direction,
The tie-down hook mounting reinforcing member, the spare tire is joined from the lower side curved portion of the vehicle transverse direction outer side portion over the vicinity of the upper end portion of the pan Rutotomoni the spare tire pan cooperation position separated from the rear side frame To form a closed section ,
The rear end portion of the tie-down hook mounting reinforcing member is provided with an extending portion extending between the floor panel and the rear side frame,
The extending portion is joined to said rear side frame and the floor panel,
The rear end of the floor panel is bent vertically upward and joined to the rear end panel,
A rear body structure of an automobile, wherein the extension portion extends to the rear end of the floor panel, is bent in the same direction as the rear end of the floor panel, and is joined to the rear end panel together with the floor panel .

A crush can fixed to the bumper is connected to a rear end of the rear side frame or the floor reinforcing member through a fastening member and a flange plate joined to the front end of the crush can.
Bend the rear end of the floor panel and the rear end of the tie-down hook attachment reinforcing member toward the vehicle interior side, and fold a part of the rear end of the tie-down hook attachment reinforcement member downward toward the outside of the vehicle compartment. The rear body structure of an automobile according to claim 1 , wherein the rear body structure is bent and fastened to the flange plate .

Wherein the rear end of the rear side frames, crash cans that is fixed to the bumper, is connected via a fastening member and a flange plate which is joined to the crush can front end,
Bend the rear end of the floor panel and the rear end of the tie-down hook attachment reinforcing member toward the vehicle interior side, and fold a part of the rear end of the tie-down hook attachment reinforcement member downward toward the outside of the vehicle compartment. The rear body structure of an automobile according to claim 2 , wherein the rear body structure is bent and fastened to the flange plate.