JPH09315346A - Underfloor structure of automobile - Google Patents
Underfloor structure of automobileInfo
- Publication number
- JPH09315346A JPH09315346A JP13698096A JP13698096A JPH09315346A JP H09315346 A JPH09315346 A JP H09315346A JP 13698096 A JP13698096 A JP 13698096A JP 13698096 A JP13698096 A JP 13698096A JP H09315346 A JPH09315346 A JP H09315346A
- Authority
- JP
- Japan
- Prior art keywords
- hot air
- underfloor
- vehicle
- floor
- air exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は自動車のアンダーフ
ロア構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle underfloor structure.
【０００２】[0002]
【従来の技術】自動車のアンダーフロア構造として本出
願人は先に特開平５−３３０４５７号公報に示されてい
るように、エンジンルームの下側を閉塞するアンダーカ
バーの後端部両側の熱気排出口からエンジンルーム内の
熱気を後輪に向けて排出させることにより、該アンダー
カバーの下側に沿う空気流の床下流れをこれら左右の熱
気排出口間に集束させて、アンダーカバー後方のフロア
下側に設置されたトランスミッションやプロペラシャフ
トおよびリヤデフ等の発熱部に指向して流出させ、該発
熱部を効率良く冷却し得るようにしたアンダーフロア構
造を提案している。2. Description of the Related Art As an underfloor structure for an automobile, the applicant of the present invention, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-330457, exhausts hot air on both sides of a rear end portion of an undercover that closes the lower side of an engine room. By discharging the hot air in the engine room from the outlet toward the rear wheels, the underfloor flow of the air flow along the lower side of the undercover is focused between these left and right hot air discharge ports, and under the floor behind the undercover. It proposes an underfloor structure that allows the heat to be efficiently cooled by directing the heat to flow toward a heat generating portion such as a transmission, a propeller shaft, and a rear differential installed on the side.
【０００３】[0003]
【発明が解決しようとする課題】アンダーカバーの左右
両側の熱気排出口はアンダーカバーの床面を車両後方に
向けて下方に傾斜して凹設してダクト状に形成してあ
り、この熱気排出口の最も地上高の低い下縁部分で車両
前方からアンダーカバーの下側を流れる床下流れを絞っ
て流速を高めて負圧値の高い負圧を発生させ、この負圧
とエンジンルーム内圧との差圧で該エンジンルーム内の
高圧の熱気を流出させて、該高圧の熱気のエアカーテン
を形成させることにより、アンダーカバー下側に沿う空
気流の床下流れをこれら左右の熱気排出口間に集束させ
ようとするものである。The hot air exhaust ports on both the left and right sides of the under cover are formed in a duct shape by recessing the floor surface of the under cover so as to incline downward toward the rear of the vehicle. At the lower edge of the exit where the ground clearance is the lowest, the underfloor flow that flows from under the undercover from the front of the vehicle is throttled to increase the flow velocity and generate a negative pressure with a high negative pressure value. The high-pressure hot air in the engine room is caused to flow out by a differential pressure to form an air curtain of the high-pressure hot air, so that the underfloor flow of the air flow along the lower side of the undercover is focused between these left and right hot air outlets. It is the one to try.
【０００４】ところが、左右の熱気排出口下縁付近に発
生する負圧によって、これら熱気排出口間に集束されて
後方へ流出する床下流れが熱気排出口側へ左右方向に偏
向、拡散されて、アンダーカバー後方のフロア下側中央
部に床下流れが集束しにくくなる傾向となる。However, due to the negative pressure generated in the vicinity of the lower edges of the left and right hot air outlets, the underfloor flow that is focused between these hot air outlets and flows out rearward is deflected and diffused to the hot air outlet side in the left and right directions, It tends to be difficult for the underfloor flow to converge at the central portion on the lower side of the floor behind the undercover.
【０００５】これは、左右の熱気排出口間の床下流れ集
束部の後端部分でも車両前方から後方へ向けて高速で流
通する床下流れによって負圧が発生するが、この発生負
圧によって床下流れ集束部の後端部からもエンジンルー
ム内の高圧の熱気が流出されて、該床下流れ集束部の後
端部分の発生負圧の負圧値が小さくなってしまうことが
原因の１つとされる。This is because underfloor flow that flows at high speed from the front side to the rear side of the vehicle at the rear end portion of the underfloor flow converging portion between the left and right hot air outlets also generates negative pressure. One of the causes is that high-pressure hot air in the engine room also flows out from the rear end of the converging section, and the negative pressure value of the negative pressure generated at the rear end of the underfloor converging section becomes small. .
【０００６】そこで、本発明はアンダーカバーの中央部
の床下流れ集束部を流通する床下流れが左右方向に偏
向、拡散されることがなく、アンダーカバー後方のフロ
ア下側中央部に床下流れを確実に集束させることができ
て、フロア下側中央部に配置された発熱部の冷却効果を
一段と高めることができる自動車のアンダーフロア構造
を提供するものである。Therefore, according to the present invention, the underfloor flow flowing through the underfloor flow converging section at the central portion of the undercover is not deflected or diffused in the left-right direction, and the underfloor flow is reliably made at the central portion under the floor behind the undercover. (EN) Provided is an underfloor structure for an automobile, which can be focused on the vehicle and can further enhance the cooling effect of the heat generating portion arranged in the central portion on the lower side of the floor.
【０００７】[0007]
【課題を解決するための手段】請求項１にあっては、車
体前部に隔成された駆動部搭載ルームの下側を平板状の
アンダーカバーで閉塞し、該アンダーカバーの左右両側
部にそれらの床面を車両後方に向けて下方に傾斜して凹
設してダクト状の熱気排出口を形成し、アンダーカバー
の中央部にこれら左右の熱気排出口の車両センター側の
側壁間に隔成された床下流れ集束部を形成した構造にお
いて、前記床下流れ集束部の上面に車体側部材の下面に
密接して、該床下流れ集束部と車体側部材との間をシー
ルするシール面を形成したことを特徴としている。According to a first aspect of the present invention, the lower side of the drive unit mounting room, which is separated from the front portion of the vehicle body, is closed by a flat plate-shaped under cover, and the left and right side portions of the under cover are closed. The floor surface of the hot air exhaust port is inclined downward toward the rear of the vehicle to form a duct-like hot air exhaust port, and the left and right hot air exhaust ports are separated from each other in the center of the undercover by a space between them. In the structure in which the underfloor flow converging portion is formed, a sealing surface is formed on the upper surface of the underfloor flow converging portion, which is in close contact with the lower surface of the vehicle body side member and seals between the underfloor flow converging portion and the vehicle body side member. It is characterized by having done.
【０００８】請求項２にあっては、請求項１に記載の床
下流れ集束部を左右の熱気排出口よりも後方に延長して
形成して、該床下流れ集束部を隔成するこれら熱気排出
口の車両センター側の側壁を、これら熱気排出口の下縁
位置よりも後方に延設したことを特徴としている。According to a second aspect of the present invention, the underfloor flow converging portion according to the first aspect is formed so as to extend rearward of the left and right hot air discharge ports, and the hot air exhausting portions which separate the underfloor flow converging portion are formed. It is characterized in that the side wall on the vehicle center side of the outlet is provided behind the lower edge positions of these hot air outlets.
【０００９】請求項３にあっては、請求項１，２に記載
の床下流れ集束部に、左右の熱気排出口の下縁と略同一
の前後方向位置に路面との間にノズルスロート部を形成
する絞り部を形成したことを特徴としている。According to a third aspect of the present invention, in the underfloor flow converging section according to the first and second aspects, a nozzle throat section is provided between the road surface and the lower edges of the left and right hot air outlets at substantially the same longitudinal position. It is characterized in that a diaphragm portion to be formed is formed.
【００１０】請求項４にあっては、請求項１〜３に記載
の左右の熱気排出口の下縁より後斜上方に傾斜したバリ
ヤガイド部を形成すると共に、該バリヤガイド部に開口
を形成したことを特徴としている。According to a fourth aspect of the present invention, a barrier guide portion inclined rearward and obliquely upward from the lower edges of the left and right hot air outlets according to the first to third aspects is formed, and an opening is formed in the barrier guide portion. It is characterized by having done.
【００１１】請求項５にあっては、請求項４に記載のバ
リヤガイド部の上縁より後斜下方に傾斜した整流部を形
成すると共に、該整流部の下縁地上高をバリヤガイド部
の下縁地上高よりも高く設定し、かつ、該整流部の下縁
より後斜上方に傾斜した第２のバリヤガイド部を形成し
たことを特徴としている。According to a fifth aspect of the present invention, there is formed a rectifying portion which is inclined rearward and downward from the upper edge of the barrier guide portion according to the fourth aspect, and the lower edge ground height of the rectifying portion is set to the ground level of the barrier guide portion. It is characterized in that a second barrier guide portion is formed which is set higher than the lower edge above ground level and is inclined rearward and obliquely upward from the lower edge of the rectifying portion.
【００１２】[0012]
【発明の効果】請求項１によれば、床下流れ集束部の上
面のシール面で、該床下流れ集束部と車体側部材との間
をシールすることによって、駆動部搭載ルーム内の高圧
の熱気が該床下流れ集束部の後端部分から流出するのを
阻止し、該床下流れ集束部の後端部分に発生する負圧の
負圧値が小さくなるのを回避することができる。According to the first aspect of the present invention, the sealing surface on the upper surface of the underfloor flow converging section seals between the underfloor flow converging section and the vehicle body side member, whereby high-pressure hot air in the drive unit mounting room is provided. Can be prevented from flowing out from the rear end portion of the underfloor flow converging portion, and the negative pressure value of the negative pressure generated at the rear end portion of the underfloor flow converging portion can be prevented from becoming small.
【００１３】この結果、左右の熱気排出口の下縁に発生
する負圧と床下流れ集束部の後端部に発生する負圧との
差圧を可及的に小さくすることができて、床下流れ集束
部を流通する床下流れが左右の熱気排出口側へ偏向、拡
散されるのを回避でき、床下流れをアンダーカバー後方
のフロア下側中央部に確実に集束できて、該フロア下側
中央部に配設された発熱部を効率よく冷却することがで
きる。As a result, the differential pressure between the negative pressure generated at the lower edges of the left and right hot air outlets and the negative pressure generated at the rear end of the underfloor flow converging section can be made as small as possible. It is possible to prevent the underfloor flow flowing through the flow converging section from being deflected and diffused to the left and right hot air outlet sides, and it is possible to reliably condense the underfloor flow to the center of the floor underside behind the undercover, and the center of the floor underside. It is possible to efficiently cool the heat generating portion arranged in the section.
【００１４】請求項２によれば、請求項１の効果に加え
て、床下流れ集束部を隔成する左右の熱気排出口の車両
センター側の側壁の延設部によって、該床下流れ集束部
を流通する床下流れがこれら左右の熱気排出口側へ流れ
込むのを阻止できるから、アンダーカバー後方のフロア
下側中央部への床下流れの集束作用を助長させることが
できる。According to the second aspect, in addition to the effect of the first aspect, the underfloor flow converging portion is provided by the extending portions of the left and right hot air exhaust ports which define the underfloor flow converging portion on the vehicle center side sidewalls. Since the flowing underfloor flow can be prevented from flowing into the left and right hot air exhaust port sides, it is possible to promote the converging action of the underfloor flow to the central portion on the lower floor side behind the undercover.
【００１５】請求項３によれば、請求項１，２の効果に
加えて、床下流れ集束部に形成した絞り部と路面との間
に左右の熱気排出口下縁と略同一の前後方向位置にノズ
ルスロート部が形成されるため、車両前方から床下流れ
集束部に流入する床下流れがこのノズルスロート部で絞
られて流速が高められることと、該ノズルスロート部で
発生する負圧の負圧値を左右の熱気排出口下縁部分で発
生する負圧の負圧値に近付けることができて差圧をより
一層小さくすることができることによって、アンダーカ
バー後方のフロア下側中央部への床下流れの集束作用を
更に助長させることができる。According to the third aspect, in addition to the effects of the first and second aspects, a position in the front-rear direction which is substantially the same as the lower edges of the hot air outlets on the left and right sides is provided between the throttle portion formed in the underfloor flow converging portion and the road surface. Since the nozzle throat portion is formed in the nozzle throat portion, the underfloor flow flowing into the underfloor flow converging portion from the front of the vehicle is throttled by this nozzle throat portion to increase the flow velocity, and the negative pressure of the negative pressure generated in the nozzle throat portion is increased. Since the value can be made closer to the negative pressure value of the negative pressure generated at the lower edges of the hot air exhaust ports on the left and right, and the differential pressure can be made even smaller, the underfloor flow to the center under the floor behind the undercover. Can further enhance the focusing action of
【００１６】請求項４によれば、請求項１〜３の効果に
加えて、車両後退時に地上高の最も低い熱気排出口下縁
が縁石等の障害物に干渉した際には、バリヤガイド部が
その傾斜に沿って障害物に乗り上げることによって、熱
気排出口を全体的に上方へ弾性変形させることができ
て、該熱気排出口が破損するのを回避することができ
る。According to claim 4, in addition to the effects of claims 1 to 3, the barrier guide portion is provided when the lower edge of the hot air outlet having the lowest ground clearance interferes with an obstacle such as a curb when the vehicle is retreating. By riding on the obstacle along the inclination, the hot air exhaust port can be elastically deformed upward as a whole, and the hot air exhaust port can be prevented from being damaged.
【００１７】また、バリヤガイドには開口が形成されて
いるから、該開口を通して駆動部搭載ルーム内の熱気の
流出作用を些かも損なうことはない。Further, since the barrier guide is formed with an opening, the outflow action of the hot air in the drive unit mounting room is not impaired through the opening.
【００１８】請求項５によれば、請求項４の効果に加え
て、バリヤガイド部の開口から流出する駆動部搭載ルー
ム内の熱気を整流部で整流することができるから、熱気
排出口の下側を流通する床下流れの剥離をなくし、該開
口からの熱気の流出をスムーズに行わせて熱気の排出効
率を向上させることができる。According to the fifth aspect, in addition to the effect of the fourth aspect, since the hot air in the drive unit mounting room flowing out from the opening of the barrier guide section can be rectified by the rectifying section, the hot air exhaust port is provided below. It is possible to eliminate the separation of the underfloor flow flowing through the side and smoothly perform the outflow of hot air from the opening, thereby improving the hot air discharge efficiency.
【００１９】また、車両後退時に地上高の高い第２のバ
リヤガイド部で障害物の高さ規制を行えて、バリヤガイ
ド部に直撃する障害物を限定することができるから、バ
リヤガイド部および開口の変形乃至破損を極力回避でき
て品質感を高めることができる。Further, since the height of the obstacle can be regulated by the second barrier guide portion having a high ground height when the vehicle retreats, and the obstacle which directly hits the barrier guide portion can be limited, the barrier guide portion and the opening. It is possible to avoid deformation or breakage of the product as much as possible, and to improve the quality.
【００２０】[0020]
【発明の実施の形態】以下、本発明の実施形態を図面と
共に詳述する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００２１】図１，２において、１は駆動部搭載ルーム
の下側を閉塞するアンダーカバーを示し、この実施形態
では駆動部搭載ルームとしてエンジンＥを搭載したエン
ジンルームＥ・Ｒの下側を、その前端部からオイルパン
Ｅａの下側に至る範囲をアンダーカバー１で閉塞してい
る。In FIGS. 1 and 2, reference numeral 1 denotes an undercover that closes the lower side of the drive unit mounting room. In this embodiment, the lower side of the engine room E / R in which the engine E is mounted as the drive unit mounting room is A range from the front end to the lower side of the oil pan Ea is closed by an under cover 1.
【００２２】このアンダーカバー１は樹脂材又は鋼板材
からなる平板状に形成してあって、その左右両側部に熱
気排出口２，２を形成してある。The undercover 1 is formed in a flat plate shape made of a resin material or a steel plate material, and hot air discharge ports 2 and 2 are formed on both left and right sides thereof.
【００２３】熱気排出口２，２はアンダーカバー１の床
面を車両後方に向けて下方に傾斜して凹設してダクト状
に形成してあり、アンダーカバー１の中央部分にこれら
左右の熱気排出口２，２の車両センター側の側壁３，３
間に隔成された床下流れ集束部４を形成してある。The hot air outlets 2 are formed in a duct shape by inclining the floor surface of the undercover 1 toward the rear of the vehicle so as to incline downward and are formed in a duct shape. Side walls 3 and 3 on the vehicle center side of the outlets 2 and 2
An underfloor flow converging section 4 is formed between the underfloor flow converging sections 4.
【００２４】熱気排出口２，２は前述のように車両後方
に向けて下方に傾斜してダクト状に凹設してあることに
より、車両前方から流入する床下流れを前記傾斜により
絞って流速を速めて負圧を発生させるが、この実施形態
ではこれら熱気排出口２，２の下縁に下向きに突出する
エアスポイラ部５を曲折成形し、該エアスポイラ部５に
よって床下流れを更に絞って、これら熱気排出口２，２
の下縁付近に負圧値の高い負圧を発生させるようにして
ある。As described above, the hot air exhaust ports 2 and 2 are formed in the shape of ducts by sloping downward toward the rear of the vehicle, so that the underfloor flow flowing in from the front of the vehicle is narrowed by the inclination to reduce the flow velocity. Although the negative pressure is generated by accelerating, in this embodiment, the air spoiler portion 5 projecting downward is bent at the lower edge of the hot air discharge ports 2 and 2, and the underfloor flow is further narrowed by the air spoiler portion 5. Outlet 2, 2
A negative pressure with a high negative pressure value is generated near the lower edge.
【００２５】また、前記床下流れ集束部４にはアンダー
カバー１の床面よりも上方に突出して、エンジンルーム
Ｅ・Ｒの後端部分に車幅方向に延在する車体側部材であ
るサスペンションクロスメンバ７の下面に密接するシー
ル面６を形成してある。Further, the underfloor flow converging section 4 is a suspension cloth which is a member on the vehicle body side which projects above the floor surface of the undercover 1 and extends in the vehicle width direction at the rear end portion of the engine room E / R. A sealing surface 6 is formed which is in close contact with the lower surface of the member 7.
【００２６】この実施形態ではアンダーカバー１はその
前端の平坦部８をラジエータコアロアメンバＭＲの下面
に結合すると共に、左右両側縁のフランジ９を図外のフ
ロントサイドメンバの側面に結合し、更に、前記シール
面６に取付部１０を形成して、該取付部１０の部分でサ
スペンションクロスメンバ７の下面に結合するようにし
てある。In this embodiment, the undercover 1 has its front end flat portion 8 joined to the lower surface of the radiator core lower member MR, and flanges 9 on both left and right edges joined to the side surfaces of the front side member (not shown). A mounting portion 10 is formed on the sealing surface 6, and the mounting portion 10 is connected to the lower surface of the suspension cross member 7.
【００２７】また、この実施形態では前記床下流れ集束
部４を左右の熱気排出口２，２よりも後方に延長して形
成して、該床下流れ集束部４を隔成するこれら熱気排出
口２，２の車両センター側の側壁３，３に、熱気排出口
２，２の下縁位置よりも後方に延びる延設部３ａ，３ａ
を形成してある。Further, in this embodiment, the underfloor flow converging section 4 is formed so as to extend rearward of the left and right hot air exhaust ports 2 and 2, and these hot air exhaust ports 2 separating the underfloor flow converging section 4 are formed. , 2 on the vehicle center side sidewalls 3, 3 extending rearward from the lower edge positions of the hot air outlets 2, 2
Is formed.
【００２８】更に、この床下流れ集束部４の上壁部に、
左右の熱気排出口２，２の下縁と略同一の前後方向位置
に路面との間にノズルスロート部を形成する断面ウェッ
ジ状の絞り部１１を凹設してある。Further, on the upper wall of the underfloor flow converging section 4,
A narrowed portion 11 having a wedge-shaped cross section is formed in the front and rear positions of the left and right hot air outlets 2, 2 to form a nozzle throat portion between the left and right hot air outlets 2 and 2 and the road surface.
【００２９】以上の実施形態の構造によれば、車両走行
時に車両前方からアンダーカバー１の下側に流入する床
下流れは、該アンダーカバー１の左右両側の熱気排出口
２，２の傾斜によって流量が絞られて流速が速められ、
エアスポイラ部５，５で更に流速が速められて熱気排出
口２，２のエアスポイラ部５，５付近に負圧値の高い負
圧が発生する。According to the structure of the above embodiment, the underfloor flow that flows into the lower side of the undercover 1 from the front of the vehicle when the vehicle is traveling is flowed by the inclination of the hot air exhaust ports 2 and 2 on the left and right sides of the undercover 1. Is narrowed down and the flow velocity is increased,
The flow velocity is further increased in the air spoiler portions 5 and 5, and a negative pressure having a high negative pressure value is generated near the air spoiler portions 5 and 5 of the hot air discharge ports 2 and 2.
【００３０】床下流れはこのように左右の熱気排出口
２，２で流量が絞られることによって、これら熱気排出
口２，２間の床下流れ集束部４に集流するようになる。The flow rate of the underfloor flow is thus reduced by the hot air discharge ports 2 and 2 on the left and right, so that it is collected in the underfloor flow converging section 4 between the hot air discharge ports 2 and 2.
【００３１】一方、前述のように左右の熱気排出口２，
２のエアスポイラ部５，５周りに発生する負圧値の高い
負圧とエンジンルーム内圧との差圧によって、該エンジ
ンルームＥ・Ｒ内の高圧の熱気が左右の熱気排出口２，
２から流出し、この高圧の熱気がエアカーテンとなって
前記床下流れ集束部４における床下流れの集束作用が促
進される。On the other hand, as described above, the left and right hot air outlets 2,
Due to the differential pressure between the high negative pressure generated around the air spoiler parts 5 and 5 and the internal pressure of the engine room, the high-pressure hot air in the engine room E / R is heated to the left and right hot air outlets 2, 2.
The high-pressure hot air that has flowed out of 2 serves as an air curtain, and the action of focusing the underfloor flow in the underfloor flow focusing section 4 is promoted.
【００３２】床下流れ集束部４の下側を高速で流通する
床下流れによって、該床下流れ集束部４の後端部付近に
も負圧が発生するが、この床下流れ集束部４の上面のシ
ール面６がサスペンションクロスメンバ７の下面と密接
してこれら両者間がシールされるため、床下流れ集束部
４の後端部分の発生負圧によって、エンジンルームＥ・
Ｒ内の高圧の熱気が該床下流れ集束部４の後端部分から
流出するのを阻止し、該床下流れ集束部４の後端部分に
発生する負圧値が小さくなるのを回避することができ
る。A negative pressure is generated near the rear end of the underfloor flow converging section 4 by the underfloor flow flowing under the underfloor flow converging section 4 at a high speed, and the upper surface of the underfloor flow converging section 4 is sealed. Since the surface 6 comes into close contact with the lower surface of the suspension cross member 7 to seal between them, the negative pressure generated at the rear end portion of the underfloor flow converging section 4 causes the engine room E.
It is possible to prevent the high-pressure hot air in R from flowing out of the rear end portion of the underfloor flow converging section 4 and to avoid a decrease in the negative pressure value generated in the rear end portion of the underfloor flow converging section 4. it can.
【００３３】この結果、左右の熱気排出口２，２のエア
スポイラ部分５，５付近に発生する負圧と、床下流れ集
束部４の後端部に発生する負圧との差圧を可及的に小さ
くすることができ、床下流れ集束部４の下側を流通する
床下流れが左右の熱気排出口２，２側へ偏向、拡散され
るのを回避でき、床下流れをアンダーカバー１の後方の
フロア下側中央部に確実に集束することができて、該フ
ロア下側中央部に配設された図外のトランスミッショ
ン、プロペラシャフト、リヤデフ等の発熱部を効率よく
冷却することができる。As a result, the differential pressure between the negative pressure generated near the air spoiler portions 5 and 5 of the left and right hot air outlets 2 and the negative pressure generated at the rear end of the underfloor flow converging portion 4 is minimized. The underfloor flow flowing under the underfloor flow converging section 4 can be prevented from being deflected and diffused to the left and right hot air outlets 2 and 2 side, and the underfloor flow can be prevented from flowing behind the undercover 1. It is possible to reliably focus the light on the floor lower central portion, and efficiently cool the heat generating portions such as the transmission, the propeller shaft, and the rear differential, which are arranged in the floor lower central portion, not shown.
【００３４】とりわけ、本実施形態では前記床下流れ集
束部４を隔成する左右の熱気排出口２，２の車両センタ
ー側の側壁３，３の延設部３ａ，３ａが、これら熱気排
出口２，２の下縁のエアスポイラ部５，５よりも後方に
延在して、これら延設部３ａ，３ａによって床下流れ集
束部４の下側を流通する床下流れがこれら左右の熱気排
出口２，２側へ流れ込むのを阻止できることと併せて、
床下流れ集束部４の絞り部１１と路面との間に前記エア
スポイラ部５，５と略同一の前後方向位置でノズルスロ
ート部が形成されて、該ノズルスロート部分で床下流れ
が絞られることにより流速が高められて負圧値の高い負
圧が発生し、エアスポイラ部５，５の部分に発生する負
圧の負圧値に近付けることができることから、前記アン
ダーカバー１の後方のフロア下側中央部への床下流れの
集束作用を一段と助長させることができる。In particular, in the present embodiment, the extended portions 3a, 3a of the side walls 3, 3 on the vehicle center side of the left and right hot air outlets 2, 2 that define the underfloor flow converging portion 4 are the hot air outlets 2. , 2 extending rearward of the air spoiler portions 5 and 5 at the lower edges of the air spoiler portions 2 and 5, and the underfloor flow flowing under the underfloor flow converging portion 4 by these extending portions 3a and 3a is the hot air discharge ports 2 on the left and right. In addition to being able to prevent it from flowing into the 2 side,
A nozzle throat portion is formed between the throttle portion 11 of the underfloor flow converging portion 4 and the road surface at a position substantially the same as the air spoiler portions 5 and 5 in the front-rear direction, and the underfloor flow is throttled at the nozzle throat portion, thereby reducing the flow velocity. Is increased to generate a negative pressure with a high negative pressure value, which can approach the negative pressure value of the negative pressure generated in the air spoiler portions 5 and 5, so that the central portion on the lower floor side behind the under cover 1 The converging action of the underfloor flow to the can be further promoted.
【００３５】しかも、このように床下流れ集束部４のノ
ズルスロート部分で床下流れの流速が速められることに
よって、前記床下流れ集束の相乗効果を得ることができ
る。Moreover, since the flow velocity of the underfloor flow is increased in the nozzle throat portion of the underfloor flow converging section 4 as described above, the synergistic effect of the underfloor flow converging can be obtained.
【００３６】図３は本発明の第２実施形態を示すもの
で、この実施形態にあっては左右の熱気排出口２，２の
下縁のエアスポイラ部５，５の下縁より後斜上方に傾斜
したバリヤガイド部１２を曲折形成すると共に、該バリ
ヤガイド部１２にエンジンルームＥ・Ｒ内の熱気を流出
させるための開口１３を形成してある。FIG. 3 shows a second embodiment of the present invention. In this embodiment, the lower edges of the left and right hot air outlets 2, 2 are located obliquely rearward and upward from the lower edges of the air spoiler portions 5, 5. The inclined barrier guide portion 12 is formed in a bent shape, and an opening 13 for letting out hot air in the engine rooms E and R is formed in the barrier guide portion 12.
【００３７】また、この実施形態では左右の熱気排出口
２，２の各前方部位に、第２の熱気排出口１４と第３の
熱気排出口１５とを設けて、これら第２，第３熱気排出
口１４，１５からもエンジンルームＥ・Ｒ内の熱気を排
出させて熱気排出性能を高め、以て、エンジンルームＥ
・Ｒ内の前端部に搭載したエアコンコンデンサＡＣやレ
ジエータＲＡ等の冷却器の冷却性能を高められるように
してある。In this embodiment, the second hot air exhaust port 14 and the third hot air exhaust port 15 are provided in front of the left and right hot air exhaust ports 2 and 2, respectively. The hot air in the engine room E / R is also discharged from the exhaust ports 14 and 15 to improve the hot air discharge performance, and thus the engine room E
The cooling performance of the coolers such as the air conditioner condenser AC and the regirator RA mounted on the front end of the R can be improved.
【００３８】従って、この実施形態によれば前記図１，
２に示した効果とは別に、車両後退時に路面Ｇからの地
上高が最も低いエアスポイラ部５，５が縁石等の障害物
と干渉するような場合、バリヤガイド部１２がこの障害
物に先当りして該バリヤガイド部１２がその傾斜に沿っ
て障害物に乗り上げることにより、熱気排出口２が全体
的に上方へ弾性変形して該熱気排出口２が破損するのを
回避することができる。Therefore, according to this embodiment, as shown in FIG.
In addition to the effect shown in FIG. 2, when the air spoiler portions 5 and 5 having the lowest ground clearance from the road surface G interfere with obstacles such as curbs when the vehicle retreats, the barrier guide portion 12 hits the obstacles first. Then, the barrier guide portion 12 rides on the obstacle along the inclination thereof, so that it is possible to avoid the hot air exhaust port 2 from being elastically deformed upward as a whole and being damaged.
【００３９】また、エンジンルームＥ・Ｒ内の熱気はバ
リヤガイド部１２の開口から流出するため、熱気排出口
２からの熱気排出作用を些かも損なうことはない。Further, since the hot air in the engine rooms E and R flows out through the opening of the barrier guide portion 12, the hot air discharging action from the hot air discharging port 2 is not impaired.
【００４０】図４，５は本発明の第３実施形態を示すも
ので、この実施形態にあっては前記図３に示した実施形
態のバリヤガイド部１２の上縁から後斜下方に傾斜する
整流部１６を形成すると共に、該整流部１６の下縁地上
高Ｈ2 をエアスポイラ部５の地上高Ｈ1 よりも高く設定
し、かつ、該整流部１６の下縁から後斜上方へ傾斜した
第２のバリヤガイド部１７を曲折成形してある。4 and 5 show a third embodiment of the present invention. In this embodiment, the barrier guide portion 12 of the embodiment shown in FIG. 3 is inclined rearward and obliquely downward from the upper edge thereof. The rectifying section 16 is formed, the lower edge ground height H 2 of the rectifying section 16 is set higher than the ground height H 1 of the air spoiler section 5, and the rectifying section 16 is inclined rearward and upward from the lower edge. The second barrier guide portion 17 is formed by bending.
【００４１】従って、この実施形態の構造によれば前記
図３に示した実施形態の効果に加えて、車両後退時には
第２のバリヤガイド部１７が障害物と先当りして、バリ
ヤガイド部１２に直撃する障害物の高さ規制を行えるか
ら、該バリヤガイド部１２およびエアスポイラ部５と障
害物との干渉を大幅に限定して、エアスポイラ部５の変
形乃至破損を極力回避できて品質感および信頼性を高め
ることができる。Therefore, according to the structure of this embodiment, in addition to the effect of the embodiment shown in FIG. 3, when the vehicle moves backward, the second barrier guide portion 17 strikes the obstacle in advance, and the barrier guide portion 12 Since the height of the obstacle directly hitting the body can be regulated, the interference between the barrier guide portion 12 and the air spoiler portion 5 and the obstacle can be largely limited, and the deformation or damage of the air spoiler portion 5 can be avoided as much as possible, and the feeling of quality can be improved. The reliability can be increased.
【００４２】また、整流部１６によってバリヤガイド部
１２の開口１３から流出する高圧の熱気を層状に整流し
て床下流れの剥離をなくすことができるから、該開口１
３からの熱気の流出をスムーズに行わせて熱気の排出効
率を向上させることができる。Further, since the high-pressure hot air flowing out from the opening 13 of the barrier guide portion 12 can be rectified by the straightening portion 16 in layers to eliminate the separation of the underfloor flow, the opening 1
The hot air can be smoothly flowed out from the air conditioner 3, and the hot air discharge efficiency can be improved.
【図１】本発明の第１実施形態を示す断面図。FIG. 1 is a sectional view showing a first embodiment of the present invention.
【図２】同実施形態のアンダーカバーの斜視図。FIG. 2 is a perspective view of an under cover of the same embodiment.
【図３】本発明の第２実施形態を示す断面図。FIG. 3 is a sectional view showing a second embodiment of the present invention.
【図４】本発明の第３実施形態を示す断面図。FIG. 4 is a sectional view showing a third embodiment of the present invention.
【図５】同実施形態のアンダーカバーの斜視図。FIG. 5 is a perspective view of the under cover of the same embodiment.
１ アンダーカバー ２ 熱気排出口 ３ 車両センター側の側壁 ４ 床下流れ集束部 ５ 熱気排出口の下縁 ６ シール面 ７ 車体側部材 １１ 絞り部 １２ バリヤガイド部 １３ 開口 １６ 整流部 １７ 第２のバリヤガイド部 1 Undercover 2 Hot Air Discharge Port 3 Side Wall on Vehicle Center Side 4 Underfloor Flow Focusing Part 5 Lower Edge of Hot Air Discharge Port 6 Sealing Surface 7 Vehicle Body Side Member 11 Throttling Part 12 Barrier Guide Part 13 Opening 16 Rectifying Part 17 Second Barrier Guide Department
Claims (5)
の下側を平板状のアンダーカバーで閉塞し、該アンダー
カバーの左右両側部にそれらの床面を車両後方に向けて
下方に傾斜して凹設してダクト状の熱気排出口を形成
し、アンダーカバーの中央部にこれら左右の熱気排出口
の車両センター側の側壁間に隔成された床下流れ集束部
を形成した構造において、前記床下流れ集束部の上面に
車体側部材の下面に密接して、該床下流れ集束部と車体
側部材との間をシールするシール面を形成したことを特
徴とする自動車のアンダーフロア構造。1. A lower side of a drive unit mounting room, which is separated from a front portion of a vehicle body, is closed by a flat plate-like under cover, and the floor surfaces of the under cover are directed downward toward the rear of the vehicle. In a structure in which a hot air exhaust port in a duct shape is formed by sloping and recessed, and an underfloor flow converging part is formed in the center of the under cover, which is separated between the left and right hot air exhaust ports on the vehicle center side. An underfloor structure for an automobile, characterized in that a sealing surface is formed on an upper surface of the underfloor flow converging portion so as to be in close contact with a lower surface of the vehicle body side member and seals between the underfloor flow converging portion and the vehicle body side member.
も後方に延長して形成して、該床下流れ集束部を隔成す
るこれら熱気排出口の車両センター側の側壁を、これら
熱気排出口の下縁位置よりも後方に延設したことを特徴
とする請求項１記載の自動車のアンダーフロア構造。2. An underfloor flow converging portion is formed to extend rearward of the left and right hot air exhaust ports, and a side wall of the hot air exhaust port separating the underfloor flow converging parts on the vehicle center side is provided with these hot air exhaust ports. The underfloor structure for an automobile according to claim 1, wherein the underfloor structure is extended rearward of a lower edge position of the outlet.
下縁と略同一の前後方向位置に路面との間にノズルスロ
ート部を形成する絞り部を形成したことを特徴とする請
求項１，２記載の自動車のアンダーフロア構造。3. The underfloor flow converging section is provided with a throttle section which forms a nozzle throat section between the road surface and the lower edges of the left and right hot air outlets at substantially the same front and rear positions. The underfloor structure of the vehicle according to 1 or 2.
傾斜したバリヤガイド部を形成すると共に、該バリヤガ
イド部に開口を形成したことを特徴とする請求項１〜３
の何れかに記載の自動車のアンダーフロア構造。4. A barrier guide portion inclined rearward and obliquely upward from lower edges of the left and right hot air outlets, and an opening is formed in the barrier guide portion.
The underfloor structure of the vehicle according to any one of 1.
斜した整流部を形成すると共に、該整流部の下縁地上高
をバリヤガイド部の下縁地上高よりも高く設定し、か
つ、該整流部の下縁より後斜上方に傾斜した第２のバリ
ヤガイド部を形成したことを特徴とする請求項４記載の
自動車のアンダーフロア構造。5. A straightening portion inclined rearward and obliquely downward from an upper edge of the barrier guide portion is formed, and a ground clearance above the bottom edge of the straightening portion is set higher than a ground clearance above the bottom edge of the barrier guide portion, and The underfloor structure for an automobile according to claim 4, wherein a second barrier guide portion that is inclined rearward and obliquely upward from a lower edge of the rectifying portion is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13698096A JPH09315346A (en) | 1996-05-30 | 1996-05-30 | Underfloor structure of automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13698096A JPH09315346A (en) | 1996-05-30 | 1996-05-30 | Underfloor structure of automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09315346A true JPH09315346A (en) | 1997-12-09 |
Family
ID=15187964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13698096A Pending JPH09315346A (en) | 1996-05-30 | 1996-05-30 | Underfloor structure of automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09315346A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100747018B1 (en) * | 2005-01-11 | 2007-08-07 | 현대자동차주식회사 | Mounting structure of a engine room under cover |
| JP2015054588A (en) * | 2013-09-11 | 2015-03-23 | トヨタ自動車株式会社 | Vehicle lower part structure |
-
1996
- 1996-05-30 JP JP13698096A patent/JPH09315346A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100747018B1 (en) * | 2005-01-11 | 2007-08-07 | 현대자동차주식회사 | Mounting structure of a engine room under cover |
| JP2015054588A (en) * | 2013-09-11 | 2015-03-23 | トヨタ自動車株式会社 | Vehicle lower part structure |
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