JP5288196B2

JP5288196B2 - Installation structure of diffuser to rear bumper in vehicle

Info

Publication number: JP5288196B2
Application number: JP2009081564A
Authority: JP
Inventors: 礼男溝口
Original assignee: Suzuki Motor Co Ltd
Current assignee: Suzuki Motor Co Ltd
Priority date: 2009-03-30
Filing date: 2009-03-30
Publication date: 2013-09-11
Anticipated expiration: 2029-03-30
Also published as: JP2010228730A

Description

本発明は、
内燃機関の排気を通過させるディフューザを、リヤバンパに形成した開口に挿入してある車両におけるリヤバンパへのディフューザの取り付け構造に関する。 The present invention
The present invention relates to a structure for attaching a diffuser to a rear bumper in a vehicle in which a diffuser for passing exhaust gas from an internal combustion engine is inserted into an opening formed in the rear bumper.

車両においては、一般的にリヤバンパの下方に排気口を配置して、内燃機関からの排気（排気ガス）を車両後方側に排出しているが、リヤバンパが大型化された車両やリヤバンパが下方に位置するようにデザインされた車両などでは、リヤバンパに貫通孔を設けて排気管を前記貫通孔に挿通させている。
このように、リヤバンパの貫通孔に排気管を挿通させる車両では、車体に不動状態に固定されたリヤバンパに対して排気管が振動するために貫通孔が大きくならざるを得ず、その上、リヤバンパから排気管が突出して見栄えが低下しやすくなる。また、前記排気管は高熱になるために、熱に弱い樹脂製のリヤバンパが劣化したり変色したりするおそれもある。
これらの対策として、リヤバンパの孔にデザインを良くした金属製のディフューザを取り付け、リヤバンパの裏側で開口する排気管の開口をディフューザで包み込んで、排気をディフューザを通して排出している。 In vehicles, an exhaust port is generally arranged below the rear bumper to exhaust the exhaust gas (exhaust gas) from the internal combustion engine to the rear side of the vehicle. In a vehicle or the like designed to be positioned, a through hole is provided in a rear bumper and an exhaust pipe is inserted through the through hole.
Thus, in a vehicle in which the exhaust pipe is inserted through the through hole of the rear bumper, the exhaust pipe vibrates with respect to the rear bumper fixed to the vehicle body in a stationary state. The exhaust pipe protrudes from the top and the appearance is liable to deteriorate. Further, since the exhaust pipe becomes hot, there is a possibility that the resin-made rear bumper which is weak against heat is deteriorated or discolored.
As countermeasures, a metal diffuser with a well-designed design is attached to the hole of the rear bumper, the exhaust pipe opening that opens on the back side of the rear bumper is wrapped with the diffuser, and the exhaust is discharged through the diffuser.

従来、上記の車両におけるリヤバンパへのディフューザの取り付け構造では、特許文献１に開示されているように、ディフューザ側取り付け部に設けた取り付けフランジの上下方向を向くフランジ面を、リヤバンパ側取り付け部に設けた取り付けフランジの上下方向を向くフランジ面に上方から重ね合わせ、各フランジに形成したボルト挿通孔に取り付けボルトを上下方向に挿通させるとともに、取り付けボルトにナットを螺合させてディフューザをリヤバンパに取り付けてあった。 Conventionally, in the above-described structure for attaching a diffuser to a rear bumper in a vehicle, as disclosed in Patent Document 1, a flange surface facing the vertical direction of a mounting flange provided on a diffuser side mounting portion is provided on the rear bumper side mounting portion. Overlay the flange surface facing the vertical direction of the mounting flange from above, insert the mounting bolt vertically into the bolt insertion hole formed in each flange, and screw the nut to the mounting bolt to attach the diffuser to the rear bumper. there were.

特開２００５−３１３７１４号公報JP 2005-313714 A

上記従来の構造によれば、リヤバンパにディフューザを組み付けるときに、リヤバンパに対してディフューザを正確に位置決めすることが困難であった。そのために、外観見切りの品質を向上させるには作業者がリヤバンパに対してディフューザの位置を十分確認しながらディフューザ側取り付け部をリヤバンパ側取り付け部に取り付けなければならず、組み付け作業性が低下していた。
本発明の目的は、組み付け作業性を向上させることができる車両におけるリヤバンパへのディフューザの取り付け構造を提供する点にある。 According to the conventional structure, it is difficult to accurately position the diffuser with respect to the rear bumper when the diffuser is assembled to the rear bumper. For this reason, in order to improve the quality of the parting appearance, the operator must attach the diffuser side mounting part to the rear bumper side mounting part while fully checking the position of the diffuser with respect to the rear bumper, which reduces the assembly workability. It was.
An object of the present invention is to provide a structure for attaching a diffuser to a rear bumper in a vehicle that can improve assembly workability.

本発明の特徴は、
内燃機関の排気を通過させるディフューザを、リヤバンパに形成した開口に挿入してある車両におけるリヤバンパへのディフューザの取り付け構造であって、
前記ディフューザに、車両前方側に向かって突出する取り付けボルトを備えた第１ディフューザ側取り付け部を設け、
前記リヤバンパに、軸芯が車両前後方向に沿うボルト挿通孔を備えた第１リヤバンパ側取り付け部を設け、
前記取り付けボルトを前記ボルト挿通孔に挿通させて、前記第１ディフューザ側取り付け部を前記第１リヤバンパ側取り付け部に取り付けてあり、
前記第１リヤバンパ側取り付け部の取り付け面を車両前後方向に対して略垂直に形成し、
前記取り付け面に前記ボルト挿通孔を形成してあり、
前記リヤバンパの開口を左右に長く形成し、
前記開口から車両前方側にオフセットして、前記開口の左右端位置で上下の開口部分の周縁を連結するように前記第１リヤバンパ側取り付け部を形成し、
車両前方側から順に、前記第１リヤバンパ側取り付け部、前記第１ディフューザ側取り付け部、前記ディフューザの周縁部を配置し、
車両後方側から見て前記第１リヤバンパ側取り付け部と前記第１ディフューザ側取り付け部を前記ディフューザの周縁部で覆い隠してあり、
前記ディフューザの車両後方側の開口端部を装飾する環状の部材であるガーニッシュを設け、
前記リヤバンパには、前記開口の周りのリヤバンパ部分から車両前方側に立ち上がる内周壁を設け、
前記リヤバンパの前記開口の前記内周壁と前記ガーニッシュとの間に走行風が流れる隙間が形成してある点にある。（請求項１） The feature of the present invention is that
A structure for attaching a diffuser to a rear bumper in a vehicle in which a diffuser for passing exhaust gas from an internal combustion engine is inserted into an opening formed in the rear bumper,
The diffuser is provided with a first diffuser side mounting portion provided with a mounting bolt protruding toward the vehicle front side,
The rear bumper is provided with a first rear bumper side mounting portion having a bolt insertion hole whose axis is along the vehicle longitudinal direction,
Said mounting bolts are inserted into the bolt insertion holes, Ri Oh attaching said first diffuser side mounting portion to the first rear bumper side mounting portion,
A mounting surface of the first rear bumper side mounting portion is formed substantially perpendicular to the vehicle longitudinal direction;
Ri Thea forming the bolt hole in the mounting surface,
The rear bumper opening is formed long on the left and right,
The first rear bumper side mounting portion is formed so as to be offset from the opening to the vehicle front side so as to connect the peripheral edges of the upper and lower opening portions at the left and right end positions of the opening,
In order from the vehicle front side, the first rear bumper side mounting portion, the first diffuser side mounting portion, and a peripheral portion of the diffuser are arranged,
Ri Oh said first diffuser side mounting portion and the first rear bumper side mounting portion as viewed from the rear side of the vehicle obscures the peripheral portion of the diffuser,
A garnish that is an annular member that decorates the opening end on the vehicle rear side of the diffuser is provided,
The rear bumper is provided with an inner peripheral wall that rises from the rear bumper portion around the opening to the vehicle front side,
There is a gap formed between the inner peripheral wall of the opening of the rear bumper and the garnish . (Claim 1)

この構成によれば、ディフューザをリヤバンパに取り付ける場合、ディフューザ側取り付け部の取り付けボルトをリヤバンパ側取り付け部のボルト挿通孔に車両後方側から挿入して、前記ボルト挿通孔に前記取り付けボルトを車両前後方向にガイドさせながら取り付けることができる。
この取り付けの際、前記取り付けボルトをボルト挿通孔に挿入した後はリヤバンパの開口に対してディフューザの位置が決まる。従って、リヤバンパの開口の内周縁とディフューザの外周縁との間の隙間を小さくして外観見切りの品質を向上させることができ、組み付け作業性を向上させることができる。そして、ディフューザをリヤバンパに取り付ける際に、リヤバンパの意匠面にディフューザが衝突することを回避できて、リヤバンパの意匠面の損傷を回避することができる。
また、車両前方側から前記取り付けボルトの締め付け作業を行うことができ、上下側から締め付けする場合に対して、バンパの内部奥側で比較的狭い空間となる締め付け箇所に締め付け工具を挿入する必要がないので、組み付け作業性を向上させることができる。さらに、取り付けボルトを介してのリヤバンパによるディフューザの仮保持が可能になって、組み付け作業性をより向上させることができる。
さらに、前記リヤバンパ側取り付け部の取り付け面を車両前後方向に対して略垂直に形成し、前記取り付け面に前記ボルト挿通孔を形成してあるので、車両前方側から温度の低い走行風を前記取り付け面に十分当てることができ、前記取り付け面を冷却することができて、リヤバンパの劣化や変色を防止することができる。
また、前記リヤバンパの開口を左右に長く形成し、前記開口の左右端位置で上下の開口部分の周縁を連結するように前記リヤバンパ側取り付け部を形成してあるから、成形型の構成が簡素化できて剛性のあるリヤバンパ側取り付け部を容易に形成できるとともに、取付部間の距離を確保し得てディフューザの位置を確実に決めることができる。
そして、車両前方側から順に、前記リヤバンパ側取り付け部、前記ディフューザ側取り付け部、前記ディフューザの周縁部を配置し、
車両後方側から見て前記リヤバンパ側取り付け部と前記ディフューザ側取り付け部を前記ディフューザの周縁部で覆い隠してあるから、ディフューザの周縁部やディフューザ側取り付け部で温められる前の温度の低い走行風がリヤバンパ側取り付け部に車両前方側から当たる。これにより、リヤバンパ側取り付け部を十分冷却することができて、リヤバンパの劣化や変色を防止することができる。
さらに、リヤバンパの開口の内周壁とガーニッシュとの間の隙間が形成されているので、この隙間を通して走行風が車両の後方に流れることになり、ガーニッシュを冷却することができて、内周壁への熱影響を少なくすることができる。
自動車の走行によってリヤバンパの内部に走行風が吹き込み、リヤバンパの後ろ側に対してリヤバンパの内部は高気圧状態となる。リヤバンパの内部の空気は、一部がディフューザの外側を流れ、リヤバンパの開口とガーニッシュの間の隙間を通過して、前記開口を冷却させるとともに、ディフューザの温度及び第１ディフューザ側取り付け部の温度を低下させて車両後方側に排出される。（請求項１） According to this configuration, when the diffuser is attached to the rear bumper, the attachment bolt of the diffuser side attachment portion is inserted into the bolt insertion hole of the rear bumper side attachment portion from the vehicle rear side, and the attachment bolt is inserted into the bolt insertion hole in the vehicle front-rear direction. It can be installed while guiding.
At the time of this attachment, after the attachment bolt is inserted into the bolt insertion hole, the position of the diffuser is determined with respect to the opening of the rear bumper. Therefore, the gap between the inner peripheral edge of the opening of the rear bumper and the outer peripheral edge of the diffuser can be reduced to improve the quality of the parting appearance, and the assembling workability can be improved. And when attaching a diffuser to a rear bumper, it can avoid that a diffuser collides with the design surface of a rear bumper, and damage to the design surface of a rear bumper can be avoided.
In addition, the mounting bolt can be tightened from the front side of the vehicle, and when tightening from the upper and lower sides, it is necessary to insert a tightening tool into a tightening point that is a relatively narrow space on the inner back side of the bumper. As a result, assembly workability can be improved. Further, the diffuser can be temporarily held by the rear bumper via the mounting bolt, and the assembling workability can be further improved.
Further, substantially vertically formed, the so the mounting surface is formed with the bolt insertion hole, the mounting of the lower traveling wind temperature from the vehicle front side mounting surface with respect to the vehicle longitudinal direction of the rear bumper side mounting portion The mounting surface can be sufficiently cooled, the mounting surface can be cooled, and the rear bumper can be prevented from being deteriorated or discolored.
In addition, the rear bumper opening is formed to be long to the left and right, and the rear bumper side mounting portion is formed so as to connect the peripheral edges of the upper and lower opening portions at the left and right end positions of the opening. In addition, a rigid rear bumper-side attachment portion can be easily formed, and a distance between the attachment portions can be ensured to reliably determine the position of the diffuser.
And, in order from the vehicle front side, arrange the rear bumper side mounting portion, the diffuser side mounting portion, the peripheral portion of the diffuser,
Since the rear bumper side mounting portion and the diffuser side mounting portion are covered with the peripheral edge portion of the diffuser when viewed from the rear side of the vehicle, the traveling wind having a low temperature before being heated by the peripheral edge portion of the diffuser or the diffuser side mounting portion It hits the rear bumper side mounting part from the vehicle front side. As a result, the rear bumper side mounting portion can be sufficiently cooled, and deterioration and discoloration of the rear bumper can be prevented.
Furthermore, since a gap is formed between the inner peripheral wall of the rear bumper opening and the garnish, the traveling wind flows to the rear of the vehicle through this gap, and the garnish can be cooled to the inner peripheral wall. Thermal effects can be reduced.
A traveling wind blows into the interior of the rear bumper as the automobile travels, and the interior of the rear bumper is in a high-pressure state with respect to the rear side of the rear bumper. A part of the air inside the rear bumper flows outside the diffuser and passes through the gap between the opening of the rear bumper and the garnish to cool the opening, and also adjusts the temperature of the diffuser and the temperature of the first diffuser side mounting portion. It is lowered and discharged to the rear side of the vehicle. (Claim 1)

本発明において、
前記ディフューザに、軸芯が上下方向に沿うナットを備えた第２ディフューザ側取り付け部を設けてあり、
前記リヤバンパに、軸芯が上下方向に沿うボルト挿通孔を備えた第２リヤバンパ側取り付け部を設けてあり、
取り付けボルトを下方から前記第２リヤバンパ側取り付け部の前記ボルト挿通孔に挿通させ、前記第２ディフューザ側取り付け部の前記ナットに螺合させて、前記第２ディフューザ側取り付け部を前記第２リヤバンパ側取り付け部に取り付けてあり、
前記第２ディフューザ側取り付け部は、車両の左右外方側から見てクランク状に形成されており、前記ディフューザのロアパネルの車両前方側の端部の下面に取り付けられる上側取り付け片と、前記上側取り付け片から下方に延びて車両前後方向に対して略垂直に位置する縦壁部と、前記縦壁部の下端部から車両前方側に水平に延びる下側取り付け片とから成り、
前記上側取り付け片と前記縦壁部と前記下側取り付け片とはいずれも断面ハット形状に形成され、前記ディフューザの前記ロアパネルの車両前方側の端部の下面と、前記下面に対向する前記第２ディフューザ側取り付け部の前記上側取り付け片の間に走行風の流通路が形成してあると、次の作用を奏することができる。（請求項２）
流通路を流れる走行風によって第２ディフューザ側取り付け部を冷却することができる。
縦壁部が車両前方側に開放した断面ハット形状に形成されていることにより走行風を捕捉しやすくなっている。さらに、流通路に走行風を流す構造になっているので、車両の走行風によって冷却されやすくなっている。（請求項２） In the present invention,
The diffuser is provided with a second diffuser side mounting portion having a nut whose axial center extends in the vertical direction,
The rear bumper is provided with a second rear bumper side mounting portion having a bolt insertion hole whose axis is along the vertical direction,
A mounting bolt is inserted from below into the bolt insertion hole of the second rear bumper side mounting portion, and is screwed into the nut of the second diffuser side mounting portion, so that the second diffuser side mounting portion is connected to the second rear bumper side. It is attached to the mounting part,
The second diffuser-side attachment portion is formed in a crank shape when viewed from the left and right outer sides of the vehicle, and an upper attachment piece attached to a lower surface of an end portion on the vehicle front side of the lower panel of the diffuser, and the upper attachment A vertical wall portion extending downward from the piece and positioned substantially perpendicular to the vehicle longitudinal direction, and a lower attachment piece extending horizontally from the lower end of the vertical wall portion to the vehicle front side,
The upper mounting piece, the vertical wall portion, and the lower mounting piece are all formed in a cross-sectional hat shape, and the lower surface of the end portion of the lower panel on the vehicle front side of the diffuser is opposed to the lower surface. If the flow path of the traveling wind is formed between the upper mounting pieces of the diffuser side mounting portion, the following action can be achieved. (Claim 2)
The second diffuser-side attachment portion can be cooled by the traveling wind flowing through the flow passage.
Since the vertical wall portion is formed in a cross-sectional hat shape opened to the front side of the vehicle, it is easy to capture the traveling wind. Furthermore, since it has a structure in which the traveling wind flows through the flow passage, it is easily cooled by the traveling wind of the vehicle. (Claim 2)

本発明において、
前記リヤバンパ側取り付け部とディフューザ側取り付け部の取り付けボルトとの間に、耐熱性を有し、熱伝導率が前記ディフューザの熱伝導率よりも小さい遮熱部材を介在させてあると、ディフューザからリヤバンパに伝わる熱の量を減少させることができ、伝わる熱の温度を低下させることができる。
これにより、例えば、リヤバンパを耐熱材料にする手段や、リヤバンパを耐熱塗装する手段や、リヤバンパの開口を大きくする等の過度の熱対策を採らずに済んで製作コストを低廉化することができる。また、前記開口を小さくすることで、デザインの自由度が広がり、リヤバンパの外観を向上させることができ、商品性を向上させることができる。（請求項３） In the present invention,
When a heat-shielding member having heat resistance and a thermal conductivity smaller than the thermal conductivity of the diffuser is interposed between the rear bumper side mounting portion and the mounting bolt of the diffuser side mounting portion, the diffuser and the rear bumper It is possible to reduce the amount of heat transferred to the heat source and to reduce the temperature of the heat transferred.
Thereby, for example, it is not necessary to take excessive heat measures such as a means for making the rear bumper a heat-resistant material, a means for coating the rear bumper with a heat-resistant material, and increasing the opening of the rear bumper, thereby reducing the manufacturing cost. Further, by reducing the opening, the degree of freedom of design can be increased, the appearance of the rear bumper can be improved, and the merchantability can be improved. (Claim 3)

本発明において、
前記ボルト挿通孔の内周面と、前記ボルト挿通孔の周りの前記リヤバンパ側取り付け部の取り付け面と、前記リヤバンパ側取り付け部の前記取り付け面とは反対側の裏面とに嵌合する嵌合溝を外周部に備えた環状の耐熱ゴム製のブッシュで前記遮熱部材を構成して、前記ブッシュを前記ボルト挿通孔に内嵌させるとともに、前記ブッシュに前記取り付けボルトを挿通させてあると、次の作用を奏することができる。（請求項４） In the present invention,
A fitting groove that fits into an inner peripheral surface of the bolt insertion hole, a mounting surface of the rear bumper side mounting portion around the bolt insertion hole, and a rear surface opposite to the mounting surface of the rear bumper side mounting portion. When the heat shield member is constituted by an annular heat-resistant rubber bush provided on the outer periphery, the bush is fitted into the bolt insertion hole, and the mounting bolt is inserted through the bush. The effect | action can be show | played. (Claim 4)

遮熱部材の構造を簡素化することができ、リヤバンパ側取り付け部と取り付けボルトの間に遮熱部材を簡単に介在させることができて、組み付け作業性を向上させることができる。また、ディフューザの振動やディフューザからの衝撃荷重をブッシュで吸収することができ、リヤバンパの損傷を防止することができる。（請求項４） The structure of the heat shield member can be simplified, and the heat shield member can be easily interposed between the rear bumper side mounting portion and the mounting bolt, and the assembling workability can be improved. Further, the vibration of the diffuser and the impact load from the diffuser can be absorbed by the bush, and damage to the rear bumper can be prevented. (Claim 4)

本発明によれば、
組み付け作業性を向上させることができる車両におけるリヤバンパへのディフューザの取り付け構造を提供することができた。 According to the present invention,
It was possible to provide a structure for attaching a diffuser to a rear bumper in a vehicle capable of improving the assembly workability.

リヤバンパの分解斜視図Disassembled perspective view of rear bumper ディフューザを前斜め上方から見た斜視図Perspective view of diffuser as seen from diagonally forward ディフューザを前斜め下方から見た斜視図Perspective view of diffuser viewed from diagonally forward ディフューザを取り付ける前のリヤバンパを車両前方側から見た斜視図A perspective view of the rear bumper before installing the diffuser as seen from the front of the vehicle ディフューザをリヤバンパに取り付けた状態を示す車両前方側から見た斜視図The perspective view seen from the vehicle front side which shows the state which attached the diffuser to the rear bumper （ａ）はディフューザを車両後方から見た図（後面図）（ｂ）は図６（ａ）のＤ−Ｄ断面図(A) is a view of the diffuser as seen from the rear of the vehicle (rear view) (b) is a cross-sectional view taken along the line DD of FIG. 6 (a). （ａ）は図１のＡ−Ａ断面図（ｂ）は第１ディフューザ側取り付け部の構成を示す分解断面図(A) is AA sectional drawing of FIG. 1, (b) is an exploded sectional view which shows the structure of the 1st diffuser side attaching part. 図１のＢ−Ｂ断面図BB sectional view of FIG. （ａ）は図１のＣ−Ｃ断面図（ｂ）は第１ディフューザ側取り付け部の構成を示す分解断面図(A) is CC sectional drawing of FIG. 1, (b) is an exploded sectional view which shows the structure of the 1st diffuser side attaching part.

以下、本発明を実施するための形態を図面に基づいて説明する。図１に、内燃機関の排気管７（図６（ｂ）参照）からの排気を通過させる金属製の左右一対のディフューザ５０を、樹脂製のリヤバンパ１００に形成した左右一対の開口１に各別に挿入してある自動車におけるリヤバンパへのディフューザの取り付け構造を示してある。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In FIG. 1, a pair of left and right metal diffusers 50 through which exhaust from an exhaust pipe 7 of an internal combustion engine (see FIG. 6B) passes are separately provided in a pair of left and right openings 1 formed in a resin rear bumper 100. A structure for attaching a diffuser to a rear bumper in an inserted automobile is shown.

［リヤバンパ１００の構造］
リヤバンパ１００は左右方向に沿う後面部２と後面部２の左右両端部から車両前方側Ｆｒに延びる左右一対の側面部３とを備えている。後面部２は横断面及び縦断面において車両後方側Ｒｒに少し凸の緩やかな円弧状に形成され、後面部２と側面部３で形成されるコーナー部４は横断面及び縦断面において円弧状に形成されている。前記開口１は後面部２の左右両端部の下端部に左右に長く形成されている。このリヤバンパ１００には、開口１の周りのリヤバンパ部分から車両前方側Ｆｒに立ち上がる内周壁９９(図８参照)が開口１の全周にわたって形成されている。 [Structure of rear bumper 100]
The rear bumper 100 includes a rear surface portion 2 along the left-right direction and a pair of left and right side portions 3 extending from the left and right ends of the rear surface portion 2 to the vehicle front side Fr. The rear surface portion 2 is formed in a gentle arc shape that is slightly convex on the vehicle rear side Rr in the transverse section and the longitudinal section, and the corner portion 4 formed by the rear surface portion 2 and the side surface portion 3 is formed in an arc shape in the transverse section and the longitudinal section. Is formed. The opening 1 is formed in the left and right ends at the left and right end portions of the rear surface portion 2 so as to extend from side to side. The rear bumper 100 is formed with an inner peripheral wall 99 (see FIG. 8) that rises from the rear bumper portion around the opening 1 to the vehicle front side Fr over the entire periphery of the opening 1.

［ディフューザ５０の構造］
図２，図３，図８に示すように、前記ディフューザ５０は筒状のディフューザ本体部１０とディフューザ本体部１０の車両後方側Ｒｒの端部に固定された環状のガーニッシュ１１とを備えている。ディフューザ本体部１０は、車両前方側Ｆｒの筒体前半部（ディフューザ本体部分）が車両後方側Ｒｒに行くに従い左右方向に拡径（少し拡径）し、車両後方側Ｒｒの筒体後半部（ディフューザ本体部分）が車両後方側Ｒｒに行くに従い左右方向及び上下方向に拡径（大きく拡径）している。 [Structure of diffuser 50]
As shown in FIGS. 2, 3, and 8, the diffuser 50 includes a cylindrical diffuser main body 10 and an annular garnish 11 fixed to the end of the diffuser main body 10 on the vehicle rear side Rr. . The diffuser main body 10 has a cylindrical front half (diffuser main body portion) on the vehicle front side Fr that expands in the left-right direction (slightly increases in diameter) as it goes to the vehicle rear side Rr. The diffuser main body portion) increases in diameter in the left-right direction and the up-down direction (largely increases in diameter) as it goes to the vehicle rear side Rr.

詳しくは、ディフューザ本体部１０は上側の半筒状（縦断面下側開放の長円弧状）のアッパパネル１４と下側の半筒状（縦断面上側開放の長円弧状）のロアパネル１５とから成る。アッパパネル１４は、下側の左右両端部に左右外方側に張り出すフランジ１４Ｆを備え、ロアパネル１５は、上側の左右両端部に左右外方側に張り出すフランジ１５Ｆを備えている。 More specifically, the diffuser main body 10 includes an upper semi-cylindrical upper panel 14 (long circular arc with an open bottom in the longitudinal section) and a lower semi-cylindrical lower panel 15 (long arc with an open upper section in the vertical section). . The upper panel 14 is provided with flanges 14F projecting to the left and right outer sides at the lower left and right ends, and the lower panel 15 is provided with flanges 15F projecting to the left and right outer sides at the upper left and right ends.

各フランジ１４Ｆ，１５Ｆは、アッパパネル１４又はロアパネル１５の車両前後方向のほぼ全長にわたって形成されている。そして、アッパパネル１４の左右一対のフランジ１４Ｆとロアパネル１５の左右一対のフランジ１５Ｆとを上下に各別に重ね合わせて溶接接合してある。 Each flange 14F, 15F is formed over substantially the entire length of the upper panel 14 or the lower panel 15 in the vehicle front-rear direction. Then, the pair of left and right flanges 14F of the upper panel 14 and the pair of left and right flanges 15F of the lower panel 15 are overlapped and welded together in the vertical direction.

このように、ディフューザ本体部１０をアッパパネル１４とロアパネル１５の接合構造に構成してあるので、上記の形状を容易に成形できディフューザ本体部１０を上記の形状の筒体に容易に構成することができる。図８に示すように、アッパパネル１４とロアパネル１５の車両後方側Ｒｒの端部１４Ｂ，１５Ｂは拡径して段差状に形成されている。 Thus, since the diffuser main body 10 is configured as a joint structure of the upper panel 14 and the lower panel 15, the above shape can be easily formed, and the diffuser main body 10 can be easily configured as a cylindrical body having the above shape. it can. As shown in FIG. 8, the end portions 14B and 15B of the upper panel 14 and the lower panel 15 on the vehicle rear side Rr are formed in a stepped shape with an enlarged diameter.

図６（ａ），図６（ｂ）に示すように、前記排気管７はディフューザ本体部１０の筒体前半部に車両前方側Ｆｒから挿入されており、排気管７の振動で筒体前半部に接触しないように、排気管７の外周面と筒体前半部の内周面との間に比較的大きな間隔が空けられている。 As shown in FIGS. 6A and 6B, the exhaust pipe 7 is inserted into the front half of the cylinder body of the diffuser main body 10 from the front Fr of the vehicle. A relatively large space is provided between the outer peripheral surface of the exhaust pipe 7 and the inner peripheral surface of the front half of the cylinder so as not to contact the portion.

［ガーニッシュ１１の構造］
ガーニッシュ１１はディフューザ５０の車両後方側Ｒｒの開口端部を装飾する環状の部材である。図８に示すように、このガーニッシュ１１は、全周にわたって車両前方側Ｆｒが開放した縦断面Ｕ字状に形成されており、内周壁６１と、内周壁６１に対して間隔を空けて位置する外周壁６０と、内外周壁６１，６０を接続する接続部６２とを備えている。ガーニッシュ１１の車両後方側Ｒｒの意匠面は車幅方向外側ほど車両前方側Ｆｒに位置する状態に曲線状に傾斜している。 [Structure of garnish 11]
The garnish 11 is an annular member that decorates the opening end of the diffuser 50 on the vehicle rear side Rr. As shown in FIG. 8, the garnish 11 is formed in a vertical cross-sectional U shape with the vehicle front side Fr open over the entire circumference, and is positioned with an interval from the inner peripheral wall 61 and the inner peripheral wall 61. The outer peripheral wall 60 and the connection part 62 which connects the inner and outer peripheral walls 61 and 60 are provided. The design surface on the vehicle rear side Rr of the garnish 11 is inclined in a curved shape so as to be positioned on the vehicle front side Fr toward the vehicle width direction outer side.

そして、内周壁６１の車両前方側Ｆｒの端部６１Ａがディフューザ本体部１０の車両後方側Ｒｒの拡径した端部（アッパパネル１４とロアパネル１５の車両後方側Ｒｒの拡径した端部１４Ｂ，１５Ｂ）に内嵌している。これによって排気の流れを円滑にするとともに外観を向上させている。 Further, the end 61A of the inner peripheral wall 61 on the vehicle front side Fr is the end of the diffuser main body 10 on the rear side Rr of the diffuser main body 10 (the ends 14B and 15B of the upper panel 14 and the lower panel 15 on the rear side Rr of the vehicle that are enlarged). ). This smoothes the flow of exhaust and improves the appearance.

外周壁６０の車両前方側Ｆｒの端部６０Ａはリヤバンパ１００の開口１内に位置し、開口１の周りのリヤバンパ部分から車両前方側Ｆｒに立ち上がるリヤバンパ１００側の内周壁９９に開口１の径方向内方側から近接している。 An end 60A of the outer peripheral wall 60 on the vehicle front side Fr is located in the opening 1 of the rear bumper 100, and a radial direction of the opening 1 is formed on the inner peripheral wall 99 on the rear bumper 100 side rising from the rear bumper portion around the opening 1 to the vehicle front side Fr. It is close from the inward side.

［リヤバンパへのディフューザの取り付け構造］
図２，図３，図７（ａ），図７（ｂ），図９（ａ），図９（ｂ）に示すように、前記ディフューザ５０に、車両前方側Ｆｒに向かって突出する取り付けボルトＢ１（スタッドボルト）を備えた左右一対の第１ディフューザ側取り付け部２１（特許請求の範囲の「ディフューザ側取り付け部」に相当）と、軸芯が上下方向に沿うナットＮを備えた第２ディフューザ側取り付け部２２とを設けてある。
また、図４，図８に示すように、リヤバンパ１００に、軸芯Ｏが車両前後方向に沿うボルト挿通孔Ｓを備えた左右一対の第１リヤバンパ側取り付け部３１（特許請求の範囲の「リヤバンパ側取り付け部」に相当）と、軸芯Ｏが上下方向に沿うボルト挿通孔Ｓを備えた第２リヤバンパ側取り付け部３２とを設けてある。 [Attachment structure of diffuser to rear bumper]
As shown in FIGS. 2, 3, 7 (a), 7 (b), 9 (a), and 9 (b), a mounting bolt that protrudes toward the vehicle front side Fr from the diffuser 50 is shown. A pair of left and right first diffuser-side mounting portions 21 (corresponding to “diffuser-side mounting portions” in the claims) provided with B1 (stud bolts), and a second diffuser including a nut N whose axis is along the vertical direction A side attachment portion 22 is provided.
4 and 8, the rear bumper 100 has a pair of left and right first rear bumper side mounting portions 31 provided with a bolt insertion hole S in which the axis O extends along the vehicle longitudinal direction. And a second rear bumper side mounting portion 32 having a bolt insertion hole S along which the axis O extends in the vertical direction.

そして、第１ディフューザ側取り付け部２１の取り付けボルトＢ１を第１リヤバンパ側取り付け部３１のボルト挿通孔Ｓ(詳しくは後述のブッシュ３５)に挿通させ、取り付けボルトＢ１にナットＮを螺合させて、第１ディフューザ側取り付け部２１を第１リヤバンパ側取り付け部３１に取り付けてある。
さらに、図５，図８に示すように、取り付けボルトＢ１を下方から第２リヤバンパ側取り付け部３２のボルト挿通孔Ｓに挿通させ、第２ディフューザ側取り付け部２２のナットＮに螺合させて、第２ディフューザ側取り付け部２２を第２リヤバンパ側取り付け部３２に取り付けてある。 Then, the mounting bolt B1 of the first diffuser-side mounting portion 21 is inserted into a bolt insertion hole S (specifically, a bush 35 described later) of the first rear bumper-side mounting portion 31, and a nut N is screwed to the mounting bolt B1. The first diffuser side attachment portion 21 is attached to the first rear bumper side attachment portion 31.
Further, as shown in FIGS. 5 and 8, the mounting bolt B1 is inserted from below into the bolt insertion hole S of the second rear bumper side mounting portion 32 and screwed into the nut N of the second diffuser side mounting portion 22. The second diffuser side attachment portion 22 is attached to the second rear bumper side attachment portion 32.

［車幅方向外側（車両側方側）の第１ディフューザ側取り付け部２１の構造］
図２，図３，図７（ａ），図７（ｂ）に示すように、左右一対の第１ディフューザ側取り付け部２１のうち、車幅方向外側の第１ディフューザ側取り付け部２１は、アッパパネル１４の車幅方向外側のフランジ１４Ｆの後端部（車両後方側Ｒｒの端部）と、ロアパネル１５の車幅方向外側のフランジ１５Ｆの後端部（車両後方側Ｒｒの端部）とに一体に形成されている。 [Structure of first diffuser side attachment portion 21 on the vehicle width direction outer side (vehicle side side)]
As shown in FIGS. 2, 3, 7 (a), and 7 (b), the first diffuser side mounting portion 21 on the outer side in the vehicle width direction of the pair of left and right first diffuser side mounting portions 21 is an upper panel. The rear end portion (end portion on the vehicle rear side Rr) of the outer flange 14F in the vehicle width direction of 14 and the rear end portion (end portion on the vehicle rear side Rr) of the flange 15F on the outer side in the vehicle width direction of the lower panel 15 are integrated. Is formed.

すなわち、両フランジ１４Ｆ，１５Ｆを車幅方向外側に長方形状に延出して互いに重ね合わせるとともに、互いに重なり合った延出部を上方に折曲して車両前後方向を向く取り付け面部２３を形成し、この取り付け面部２３に取り付けボルトＢ１を車両後方側Ｒｒから貫通させ、取り付けボルトＢの頭部を取り付け面部２３に溶接接合してある。取り付け面部２３は車両前後方向に対して略垂直に位置している。 That is, both flanges 14F and 15F extend in a rectangular shape outward in the vehicle width direction and overlap each other, and the extending portions that overlap each other are bent upward to form a mounting surface portion 23 facing the vehicle longitudinal direction. The attachment bolt B1 is passed through the attachment surface portion 23 from the vehicle rear side Rr, and the head of the attachment bolt B is welded to the attachment surface portion 23. The attachment surface portion 23 is positioned substantially perpendicular to the vehicle longitudinal direction.

このように、車幅方向外側の第１ディフューザ側取り付け部２１を、別途ブラケットを使用することなくアッパパネル１４の車幅方向外側のフランジ１４Ｆとロアパネル１５の車幅方向外側のフランジ１５Ｆとで形成してあるので部品点数を削減することができる。しかも、アッパパネル１４とロアパネル１５の位置合わせにも使用することができて生産性を向上させることができる。 In this way, the first diffuser side mounting portion 21 on the outer side in the vehicle width direction is formed by the flange 14F on the outer side in the vehicle width direction of the upper panel 14 and the flange 15F on the outer side in the vehicle width direction of the lower panel 15 without using a separate bracket. Therefore, the number of parts can be reduced. In addition, it can be used to align the upper panel 14 and the lower panel 15, and productivity can be improved.

［車幅方向内側（車両中央側）の第１ディフューザ側取り付け部２１の構造］
図２，図３，図９（ａ），図９（ｂ）に示すように、車幅方向内側の第１ディフューザ側取り付け部２１は、アッパパネル１４の車両後方側Ｒｒの拡径した端部１４Ｂの上面とロアパネル１５の車両後方側Ｒｒの拡径した端部１５Ｂの側面とに、車両前後方向から見て「く」の字状のブラケット２４の両脚部２５を各別に溶接接合し、ブラケット２４に取り付けボルトＢ１を貫通・固着して構成されている。 [Structure of first diffuser-side mounting portion 21 on the inner side in the vehicle width direction (vehicle center side)]
As shown in FIGS. 2, 3, 9 (a) and 9 (b), the first diffuser side mounting portion 21 on the inner side in the vehicle width direction is an end portion 14 </ b> B whose diameter is increased on the vehicle rear side Rr of the upper panel 14. The leg portions 25 of the brackets 24 having a "<" shape as seen from the vehicle front-rear direction are welded to the upper surface of the lower panel 15 and the side surface of the enlarged end portion 15B on the vehicle rear side Rr of the lower panel 15, respectively. The mounting bolt B1 is penetrated and fixed to.

前記ブラケット２４は板面が車両前後方向を向く一枚板状に形成され、両脚部２５に取り付けフランジ２５Ｆがそれぞれ折曲形成されている。そして、この取り付けフランジ２５Ｆがアッパパネル１４の車両後方側Ｒｒの拡径した端部１４Ｂの上面とロアパネル１５の車両後方側Ｒｒの拡径した端部１５Ｂの側面とに重ねられて溶接接合されている。これにより、上下に長い取り付け距離（ブラケット２４の両脚部２５の取り付け距離）を確保して剛性のある取り付け面を形成している。 The bracket 24 is formed in a single plate shape whose plate surface faces the vehicle front-rear direction, and mounting flanges 25F are bent at both leg portions 25, respectively. The mounting flange 25F is overlapped and welded to the upper surface of the enlarged end portion 14B of the upper panel 14 on the vehicle rear side Rr and the side surface of the enlarged end portion 15B of the lower panel 15 on the vehicle rear side Rr. . Thereby, a long attachment distance (attachment distance between both leg portions 25 of the bracket 24) is ensured to form a rigid attachment surface.

両脚部２５間のブラケット部分はリヤバンパ１００に対する取り付け面部２６に構成され、この取り付け面部２６に取り付けボルトＢ１が車両後方側Ｒｒから貫通し、取り付けボルトＢ１の頭部が取り付け面部２６に溶接接合されている。 A bracket portion between the two leg portions 25 is formed on a mounting surface portion 26 with respect to the rear bumper 100. A mounting bolt B1 penetrates the mounting surface portion 26 from the vehicle rear side Rr, and a head of the mounting bolt B1 is welded to the mounting surface portion 26. Yes.

例えば、ブラケット２４を細く長く形成して、ブラケット２４からリヤバンパ１００への伝熱量を抑え、伝熱経路を長く設定した構造では、第１リヤバンパ側取り付け部３１に対する取り付け剛性を確保することが困難になる。これに対して、本発明では、比較的短い（小さい）ブラケットを用いて取り付け剛性を確保し、溶接箇所のみ接触するようにして、ディフューザ本体部１０とブラケット２４との接触面積（入熱部）を少なくし、冷却性能を向上させている。 For example, in a structure in which the bracket 24 is formed to be thin and long, the amount of heat transfer from the bracket 24 to the rear bumper 100 is suppressed, and the heat transfer path is set to be long, it is difficult to secure the mounting rigidity for the first rear bumper side mounting portion 31. Become. On the other hand, in the present invention, a relatively short (small) bracket is used to secure the mounting rigidity and only the welded portion is contacted so that the contact area between the diffuser body 10 and the bracket 24 (heat input portion). The cooling performance is improved.

［第２ディフューザ側取り付け部２２の構造］
図２，図３，図８に示すように、第２ディフューザ側取り付け部２２は、車両の側方（車両の左右外方側）から見てクランク状に形成されており、ロアパネル１５の車両前方側Ｆｒの端部１５Ａの下面に取り付けられる上側取り付片２７と、上側取り付け片２７から下方に延びて車両前後方向に対して略垂直に位置する縦壁部２８と、縦壁部２８の下端部から車両前方側Ｆｒに水平に延びて第２リヤバンパ側取り付け部３２の取り付け面部４０（図４参照）に取り付けられる下側取り付け片２９とから成る。 [Structure of second diffuser-side attachment portion 22]
As shown in FIGS. 2, 3, and 8, the second diffuser-side attachment portion 22 is formed in a crank shape when viewed from the side of the vehicle (the left and right outer sides of the vehicle), and the front of the lower panel 15 in the vehicle. An upper mounting piece 27 attached to the lower surface of the end portion 15A of the side Fr, a vertical wall portion 28 extending downward from the upper attachment piece 27 and positioned substantially perpendicular to the vehicle longitudinal direction, and a lower end of the vertical wall portion 28 And a lower attachment piece 29 that extends horizontally from the front portion to the vehicle front side Fr and is attached to the attachment surface portion 40 (see FIG. 4) of the second rear bumper side attachment portion 32.

上側取り付片２７と縦壁部２８と下側取り付片２９とはいずれも断面ハット形状に形成され、上側取り付け片２７の左右一対の上側フランジ２７Ｆがロアパネル１５の車両前方側Ｆｒの端部１５Ａの下面に重ね合わされて溶接接合されている。これにより、ロアパネル１５の車両前方側Ｆｒの端部１５Ａの下面と、この下面に対向する上側取り付け片２７の本体部２７Ｈとの間に走行風の流通路Ｒ（図８参照）が形成されている。従って、前記流通路Ｒを流れる走行風によって第２ディフューザ側取り付け部２２を冷却することができる。 The upper mounting piece 27, the vertical wall portion 28, and the lower mounting piece 29 are all formed in a cross-sectional hat shape, and the pair of left and right upper flanges 27F of the upper mounting piece 27 are end portions of the lower panel 15 on the vehicle front side Fr. It is superposed on the lower surface of 15A and welded. As a result, a traveling wind flow path R (see FIG. 8) is formed between the lower surface of the end portion 15A on the vehicle front side Fr of the lower panel 15 and the main body portion 27H of the upper mounting piece 27 facing the lower surface. Yes. Accordingly, the second diffuser-side attachment portion 22 can be cooled by the traveling wind flowing through the flow passage R.

下側取り付け片２９の本体部２９Ｈの中央部にはボルト挿通孔Ｓが形成され、前記本体部２９Ｈの上面にナットＮがボルト挿通孔Ｓと同芯状に溶接接合されている。 A bolt insertion hole S is formed at the center of the main body portion 29H of the lower attachment piece 29, and a nut N is welded and joined to the upper surface of the main body portion 29H in a concentric manner with the bolt insertion hole S.

第２ディフューザ側取り付け部２２は、ディフューザ５０の比較的高温となる部位に取り付けられているが、走行風を受けやすい位置に配置されて走行風に対向していることと、縦壁部２８が車両前方側Ｆｒに開放した断面ハット形状に形成されていることとにより走行風を捕捉しやすくなっている。さらに、前記流通路Ｒに走行風を流す構造になっているので、車両の走行風によって冷却されやすくなっている。また、リヤバンパ１００の下端部側に位置し、熱影響を受けてもリヤバンパ１００の劣化や変色が目立たない位置にあることから、第２ディフューザ側取り付け部２２には遮熱部材は設けられていない。 The second diffuser-side attachment portion 22 is attached to a portion of the diffuser 50 where the temperature is relatively high. However, the second diffuser-side attachment portion 22 is disposed at a position where the traveling wind is easily received and is opposed to the traveling wind. The traveling wind can be easily captured by being formed in a cross-sectional hat shape opened to the front side Fr of the vehicle. Furthermore, since it has a structure in which the traveling wind flows through the flow passage R, it is easily cooled by the traveling wind of the vehicle. Further, since the rear bumper 100 is located on the lower end side and is in a position where deterioration or discoloration of the rear bumper 100 is not noticeable even if it is affected by heat, the second diffuser side mounting portion 22 is not provided with a heat shield member. .

［第１リヤバンパ側取り付け部３１の構造］
図４，図５，図７（ａ），図７（ｂ），図９（ａ），図９（ｂ）に示すように、第１リヤバンパ側取り付け部３１は、リヤバンパ１００の開口１から車両前方側Ｆｒにオフセットして、前記開口１の左右端位置で上下の開口部分の周縁を連結するように形成されている。つまり、車両前後方向視でリヤバンパ１００の開口１の左右方向の端部に沿う周壁３３を開口１の周部から車両前方側Ｆｒに向かって立設するとともに、周壁３３の車両前方側Ｆｒの端部から開口１の径方向内方側に延びる取り付け面部３４を車両前後方向に対して略垂直に形成し、この取り付け面部３４に、前記径方向内方側が切り欠かれたボルト挿通孔Ｓを形成してある。このボルト挿通孔Ｓの切り欠き３８は、後述するようにブッシュ３５の組み付けを容易にし、組み付け作業性を向上させている。また、この切り欠きはもう一方の第１リヤバンパ側取り付け部３１の方向に形成されているので、ディフューザ５０が取り付けられた後では、切り欠き３８からブッシュ３５は抜け出ることができない。 [Structure of first rear bumper side mounting portion 31]
As shown in FIGS. 4, 5, 7 (a), 7 (b), 9 (a), and 9 (b), the first rear bumper side mounting portion 31 is connected to the vehicle from the opening 1 of the rear bumper 100. It is formed to be offset to the front side Fr so as to connect the peripheral edges of the upper and lower opening portions at the left and right end positions of the opening 1. That is, the peripheral wall 33 that extends along the left and right ends of the opening 1 of the rear bumper 100 in the vehicle front-rear direction is erected from the peripheral portion of the opening 1 toward the vehicle front side Fr, and the end of the peripheral wall 33 on the vehicle front side Fr. A mounting surface portion 34 extending from the portion to the radially inward side of the opening 1 is formed substantially perpendicular to the vehicle front-rear direction, and a bolt insertion hole S in which the radially inner side is cut is formed in the mounting surface portion 34. It is. The notch 38 of the bolt insertion hole S facilitates the assembly of the bush 35 as will be described later, and improves the assembly workability. Further, since this notch is formed in the direction of the other first rear bumper side attaching portion 31, the bush 35 cannot be pulled out from the notch 38 after the diffuser 50 is attached.

第１リヤバンパ側取り付け部３１と第１ディフューザ側取り付け部２１の取り付けボルトＢとの間には、リヤバンパ１００の材料（樹脂材）以上の耐熱性を有し、熱伝導率がディフューザ５０の熱伝導率よりも小さい遮熱部材としての耐熱ゴム製のブッシュ３５を介在させてある。 Between the first rear bumper side mounting portion 31 and the mounting bolt B of the first diffuser side mounting portion 21, it has heat resistance higher than that of the material (resin material) of the rear bumper 100, and the thermal conductivity is that of the diffuser 50. A heat-resistant rubber bush 35 is interposed as a heat shield member smaller than the ratio.

このブッシュ３５は、第１リヤバンパ側取り付け部３１のボルト挿通孔Ｓの内周面と、前記ボルト挿通孔Ｓの周りの第１リヤバンパ側取り付け部３１の取り付け面（前記取り付け面部３４の取り付け面）３１Ｍと、第１リヤバンパ側取り付け部３１の前記取り付け面３１Ｍとは反対側の裏面３１Ｎとに嵌合する嵌合溝３６を外周部に備えている。またブッシュ３５に金属製の円筒状のカラー３７（スペーサー）が内嵌している。そして、前記ブッシュ３５を前記ボルト挿通孔Ｓに、切り欠き３８を通過させて横方向から内嵌させるとともに、前記ブッシュ３５内のカラー３７に取り付けボルトＢ１を挿通させてある。ブッシュ３５を切り欠き３８を通過させて横方向から内嵌させているので、嵌合溝３６を深く形成することができ、脱落が防止されるとともに、第１リヤバンパ側取り付け部３１と第１ディフューザ側取り付け部２１との間のブッシュ３５の面積を増やすことができるので、ブッシュ３５の遮熱性能と耐久性能の向上が可能となる。 The bush 35 includes an inner peripheral surface of the bolt insertion hole S of the first rear bumper side attachment portion 31 and an attachment surface of the first rear bumper side attachment portion 31 around the bolt insertion hole S (an attachment surface of the attachment surface portion 34). A fitting groove 36 that fits between 31M and the rear surface 31N of the first rear bumper side mounting portion 31 opposite to the mounting surface 31M is provided on the outer peripheral portion. Further, a metal cylindrical collar 37 (spacer) is fitted into the bush 35. The bush 35 is inserted into the bolt insertion hole S through the notch 38 from the lateral direction, and the mounting bolt B1 is inserted into the collar 37 in the bush 35. Since the bush 35 is inserted through from the lateral direction through the notch 38, the fitting groove 36 can be formed deeply to prevent falling off, and the first rear bumper side mounting portion 31 and the first diffuser. Since the area of the bush 35 between the side attachment portion 21 can be increased, the heat shielding performance and durability of the bush 35 can be improved.

前記カラー３７によってブッシュ３５の変形を抑制することができ、取り付けボルトＢ１の締め付け軸力を確保することができる。取り付けボルトＢ１の代わりに段付きの取り付けボルトＢ１を使用すれば、カラー３７を廃止することができて部品点数の削減が可能となる。
前記第１リヤバンパ側取り付け部３１の取り付け面（前記取り付け面部３４の取り付け面）３１Ｍは車両前後方向に対して略垂直に形成されている。また、前記裏面３１Ｎには段差状の取り付け座面が形成されている。 The deformation of the bush 35 can be suppressed by the collar 37, and the tightening axial force of the mounting bolt B1 can be ensured. If the stepped mounting bolt B1 is used instead of the mounting bolt B1, the collar 37 can be eliminated and the number of parts can be reduced.
A mounting surface (mounting surface of the mounting surface portion 34) 31M of the first rear bumper side mounting portion 31 is formed substantially perpendicular to the vehicle longitudinal direction. Further, a stepped attachment seat surface is formed on the back surface 31N.

図７，図９（ａ），図９（ｂ）に示すように、車両前方側Ｆｒから順に、前記第１リヤバンパ側取り付け部３１、第１ディフューザ側取り付け部２１、ディフューザ５０に設けたガーニッシュ１１の周縁部を配置し、車両後方側Ｒｒから見て第１リヤバンパ側取り付け部３１と第１ディフューザ側取り付け部２１をガーニッシュ１１の周縁部で覆い隠してある。
これにより、ガーニッシュ１１の周縁部や第１ディフューザ側取り付け部２１で温められる前の温度の低い走行風が第１リヤバンパ側取り付け部３１に車両前方側から当たり、第１リヤバンパ側取り付け部３１を十分冷却することができて、リヤバンパ１００の劣化や変色を防止することができる。そして、リヤバンパ１００の開口１の内周壁９９とガーニッシュ１１との間の隙間が形成されているので、この隙間を通して走行風が車両の後方に流れることになり、ガーニッシュ１１を冷却することができて、内周壁９９への熱影響を少なくすることができる。
また、第１リヤバンパ側取り付け部３１の形状によって走行風を受け入れるとともに、走行風が第１ディフューザ側取り付け部２１の近傍を流れることになるので、第１ディフューザ側取り付け部２１を冷却することができ、リヤバンパ１００への熱影響を少なくすることができる。 As shown in FIGS. 7, 9 (a), and 9 (b), the garnish 11 provided in the first rear bumper side mounting portion 31, the first diffuser side mounting portion 21, and the diffuser 50 in order from the vehicle front side Fr. The first rear bumper side mounting portion 31 and the first diffuser side mounting portion 21 are covered with the peripheral portion of the garnish 11 when viewed from the vehicle rear side Rr.
As a result, the traveling wind having a low temperature before being heated by the peripheral portion of the garnish 11 or the first diffuser-side attachment portion 21 hits the first rear bumper-side attachment portion 31 from the front side of the vehicle, and the first rear bumper-side attachment portion 31 is sufficiently covered. It can cool and can prevent deterioration and discoloration of the rear bumper 100. And since the clearance gap between the inner peripheral wall 99 of the opening 1 of the rear bumper 100 and the garnish 11 is formed, a driving | running | working wind will flow to the back of a vehicle through this clearance gap, and the garnish 11 can be cooled. The heat influence on the inner peripheral wall 99 can be reduced.
In addition, the traveling wind is received by the shape of the first rear bumper side mounting portion 31 and the traveling wind flows in the vicinity of the first diffuser side mounting portion 21, so that the first diffuser side mounting portion 21 can be cooled. In addition, the thermal influence on the rear bumper 100 can be reduced.

［第２リヤバンパ側取り付け部３２の構造］
図４，図８に示すように、第２リヤバンパ側取り付け部３２は、リヤバンパ１００の下端部の車両前方側Ｆｒの部分に水平な取り付け面部４０を段差状に形成し、取り付け面部４０にボルト挿通孔Ｓを設けて構成されている。 [Structure of second rear bumper side mounting portion 32]
As shown in FIGS. 4 and 8, the second rear bumper side mounting portion 32 has a horizontal mounting surface portion 40 formed in a step shape on the vehicle front side Fr portion of the lower end portion of the rear bumper 100, and bolts are inserted into the mounting surface portion 40. A hole S is provided.

［組み付け方法］
前記ディフューザ５０はリヤバンパ１００が車体に搭載される前にリヤバンパ１００に次のように部組される。
（１）ディフューザ５０をリヤバンパ１００の開口１に車両後方側Ｒｒから挿入し、第１ディフューザ側取り付け部２１の取り付けボルトＢ１を、第１リヤバンパ側取り付け部３１のブッシュ３５内のカラー３７に挿入する。
前記取り付けボルトＢ１は、前記開口１に接近配置されるディフューザ５０のガーニッシュ１１が開口１に挿入される前に、前記ブッシュ３５内のカラー３７に挿入される長さとなっている。
これにより、前記取り付けボルトＢ１をカラー３７に挿入した後はリヤバンパ１００の開口１に対してディフューザ５０の位置が決まる。従って、組み付け作業の際にリヤバンパ１００の意匠面にディフューザ５０が衝突することを回避できて、リヤバンパ１００の意匠面の損傷を回避することができる。
（２）前記取り付けボルトＢ１にナットＮを螺合させて、第１ディフューザ側取り付け部２１を第１リヤバンパ側取り付け部３１に取り付ける。さらに、図５，図８に示すように、取り付けボルトＢ１を下方から第２リヤバンパ側取り付け部３２のボルト挿通孔Ｓに挿通させ、第２ディフューザ側取り付け部２２のナットＮに螺合させて、第２ディフューザ側取り付け部２２を第２リヤバンパ側取り付け部３２に取り付ける。 [Assembly method]
The diffuser 50 is assembled to the rear bumper 100 as follows before the rear bumper 100 is mounted on the vehicle body.
(1) The diffuser 50 is inserted into the opening 1 of the rear bumper 100 from the vehicle rear side Rr, and the mounting bolt B1 of the first diffuser side mounting portion 21 is inserted into the collar 37 in the bush 35 of the first rear bumper side mounting portion 31. .
The mounting bolt B <b> 1 has a length to be inserted into the collar 37 in the bush 35 before the garnish 11 of the diffuser 50 disposed close to the opening 1 is inserted into the opening 1.
Thus, after the mounting bolt B1 is inserted into the collar 37, the position of the diffuser 50 is determined with respect to the opening 1 of the rear bumper 100. Accordingly, it is possible to avoid the diffuser 50 from colliding with the design surface of the rear bumper 100 during the assembling work, and damage to the design surface of the rear bumper 100 can be avoided.
(2) The nut N is screwed onto the mounting bolt B1, and the first diffuser-side mounting portion 21 is mounted on the first rear bumper-side mounting portion 31. Further, as shown in FIGS. 5 and 8, the mounting bolt B1 is inserted from below into the bolt insertion hole S of the second rear bumper side mounting portion 32 and screwed into the nut N of the second diffuser side mounting portion 22. The second diffuser side attachment portion 22 is attached to the second rear bumper side attachment portion 32.

［風の流れ］
自動車の走行によってリヤバンパ１００の内部に走行風が吹き込み、リヤバンパ１００の後ろ側に対してリヤバンパ１００の内部は高気圧状態となる。リヤバンパ１００の内部の空気は、一部が排気と一緒にディフューザ５０内を通過して排気温度とディフューザ５０内の温度とを低下させて車両後方に排出される。
また、一部がディフューザ５０の外側を流れ、リヤバンパ１００の開口１とガーニッシュ１１の間の隙間を通過して、前記開口１を冷却させるとともに、ディフューザ５０の温度及び第１ディフューザ側取り付け部２１の温度を低下させて車両後方側Ｒｒに排出される。
本発明の構成によれば、第１ディフューザ側取り付け部２１を風の流れが比較的強い場所となるリヤバンパ１００の開口１の近辺に配置したので、風による冷却をより期待できる。 [Wind flow]
A traveling wind blows into the interior of the rear bumper 100 as the automobile travels, and the interior of the rear bumper 100 is in a high-pressure state with respect to the rear side of the rear bumper 100. A part of the air inside the rear bumper 100 passes through the diffuser 50 together with the exhaust gas, and the exhaust air temperature and the temperature inside the diffuser 50 are lowered to be discharged to the rear of the vehicle.
Further, a part flows outside the diffuser 50, passes through the gap between the opening 1 of the rear bumper 100 and the garnish 11, cools the opening 1, and adjusts the temperature of the diffuser 50 and the first diffuser side attachment portion 21. The temperature is lowered and discharged to the vehicle rear side Rr.
According to the configuration of the present invention, since the first diffuser-side attachment portion 21 is disposed in the vicinity of the opening 1 of the rear bumper 100 where the wind flow is relatively strong, cooling by wind can be expected more.

１開口
１１ガーニッシュ
２１ディフューザ側取り付け部（第１ディフューザ側取り付け部）
３１リヤバンパ側取り付け部（第１リヤバンパ側取り付け部）
３５遮熱部材（ブッシュ）
３１Ｍ取り付け面（ボルト挿通孔の周りのリヤバンパ側取り付け部の取り付け面）
３１Ｎリヤバンパ側取り付け部の取り付け面とは反対側の裏面
３６嵌合溝
５０ディフューザ
１００リヤバンパ
Ｂ取り付けボルト
Ｆｒ車両前方側
Ｏ軸芯
Ｒｒ車両後方側
Ｓボルト挿通孔 1 Opening 11 Garnish 21 Diffuser Side Attachment (First Diffuser Side Attachment)
31 Rear bumper side mounting part (first rear bumper side mounting part)
35 Heat shield (bush)
31M Mounting surface (Mounting surface of the rear bumper side mounting part around the bolt insertion hole)
31N Back surface 36 opposite to mounting surface of rear bumper side mounting portion 36 Fitting groove 50 Diffuser 100 Rear bumper B Mounting bolt Fr Vehicle front side O Axle core Rr Vehicle rear side S Bolt insertion hole

Claims

A structure for attaching a diffuser to a rear bumper in a vehicle in which a diffuser for passing exhaust gas from an internal combustion engine is inserted into an opening formed in the rear bumper,
The diffuser is provided with a first diffuser side mounting portion provided with a mounting bolt protruding toward the vehicle front side,
The rear bumper is provided with a first rear bumper side mounting portion having a bolt insertion hole whose axis is along the vehicle longitudinal direction,
Said mounting bolts are inserted into the bolt insertion holes, Ri Oh attaching said first diffuser side mounting portion to the first rear bumper side mounting portion,
A mounting surface of the first rear bumper side mounting portion is formed substantially perpendicular to the vehicle longitudinal direction;
Ri Thea forming the bolt hole in the mounting surface,
The rear bumper opening is formed long on the left and right,
The first rear bumper side mounting portion is formed so as to be offset from the opening to the vehicle front side so as to connect the peripheral edges of the upper and lower opening portions at the left and right end positions of the opening,
In order from the vehicle front side, the first rear bumper side mounting portion, the first diffuser side mounting portion, and a peripheral portion of the diffuser are arranged,
Ri Oh said first diffuser side mounting portion and the first rear bumper side mounting portion as viewed from the rear side of the vehicle obscures the peripheral portion of the diffuser,
A garnish that is an annular member that decorates the opening end on the vehicle rear side of the diffuser is provided,
The rear bumper is provided with an inner peripheral wall that rises from the rear bumper portion around the opening to the vehicle front side,
A structure for attaching a diffuser to a rear bumper in a vehicle in which a gap through which traveling wind flows is formed between the inner peripheral wall of the opening of the rear bumper and the garnish .

The diffuser is provided with a second diffuser side mounting portion having a nut whose axial center extends in the vertical direction,
The rear bumper is provided with a second rear bumper side mounting portion having a bolt insertion hole whose axis is along the vertical direction,
A mounting bolt is inserted from below into the bolt insertion hole of the second rear bumper side mounting portion, and is screwed into the nut of the second diffuser side mounting portion, so that the second diffuser side mounting portion is connected to the second rear bumper side. It is attached to the mounting part,
The second diffuser-side attachment portion is formed in a crank shape when viewed from the left and right outer sides of the vehicle, and an upper attachment piece attached to a lower surface of an end portion on the vehicle front side of the lower panel of the diffuser, and the upper attachment A vertical wall portion extending downward from the piece and positioned substantially perpendicular to the vehicle longitudinal direction, and a lower attachment piece extending horizontally from the lower end of the vertical wall portion to the vehicle front side,
The upper mounting piece, the vertical wall portion, and the lower mounting piece are all formed in a cross-sectional hat shape, and the lower surface of the end portion of the lower panel on the vehicle front side of the diffuser is opposed to the lower surface. 2. A structure for attaching a diffuser to a rear bumper in a vehicle according to claim 1 , wherein a flow path for traveling wind is formed between the upper attachment pieces of the diffuser side attachment portion .

The heat-insulating member which has heat resistance and whose heat conductivity is smaller than the heat conductivity of the said diffuser is interposed between the rear bumper side attaching part and the attaching bolt of the diffuser side attaching part. A structure for attaching a diffuser to a rear bumper in the described vehicle.

A fitting groove that fits into an inner peripheral surface of the bolt insertion hole, a mounting surface of the rear bumper side mounting portion around the bolt insertion hole, and a rear surface opposite to the mounting surface of the rear bumper side mounting portion. 4. The heat shield member is constituted by an annular heat-resistant rubber bush provided on the outer peripheral portion, and the bush is inserted into the bolt insertion hole, and the mounting bolt is inserted through the bush. A structure for attaching a diffuser to a rear bumper in the described vehicle.