CN110104078B

CN110104078B - Hollow-out type drag-reducing and lift-reducing SUV rear spoiler

Info

Publication number: CN110104078B
Application number: CN201910281685.4A
Authority: CN
Inventors: 李志强; 武志宏
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2021-06-22
Anticipated expiration: 2039-04-09
Also published as: CN110104078A

Abstract

The invention discloses a hollow-out type drag reduction and lift reduction SUV rear spoiler, wherein a rectangular hole is formed in the middle of the rear spoiler, and airflow is allowed to directly flow through the rectangular hole, so that a low-pressure area behind a rear window of a vehicle is reduced, and the pressure difference resistance borne by the vehicle in the driving process is reduced. Meanwhile, the cross section of the spoiler behind the rectangular hole is designed into an inverted wing shape, so that the downforce loss caused by opening is compensated, and the offsetting effect of the rear spoiler on the ascending force borne by the vehicle is not influenced while the pressure difference resistance is reduced.

Description

Hollow-out type drag-reducing and lift-reducing SUV rear spoiler

Technical Field

The invention belongs to the field of SUV (sports utility vehicle) rear spoilers, and particularly relates to a hollow-out type drag-reducing lift-reducing SUV rear spoiler.

Background

It can be seen that in recent years, the popularity of SUV vehicles in cities is increasing, and almost all of the rear windows of SUV vehicles extend out from the top of the vehicle to form a section, namely a rear spoiler. Because the vehicle body is usually an irregular streamlined body, when air flows through, the vehicle body can generate upward lifting force like a wing, and the rear spoiler is used for generating downward pressure on the premise of not obviously increasing the weight of the vehicle body, offsetting a part of upward force borne by the vehicle in the driving process, preventing the vehicle from turning too much and reducing the ground-holding force of the rear wheels, and improving the driving stability of the vehicle. Meanwhile, the rear spoiler can also enhance the dynamic feeling and the attractiveness of the automobile and embody the personalized design. However, the rear spoiler inevitably forms a certain low-pressure area behind the rear window of the automobile, so that the differential pressure resistance suffered by the automobile in the running process is increased, and the oil consumption is obviously increased particularly in the high-speed running process.

Disclosure of Invention

The invention provides a hollow-out type drag-reducing and lift-reducing SUV rear spoiler, aiming at solving the contradiction between lift reduction and resistance increase after the SUV rear spoiler is added at present.

The hollow-out type drag reduction and lift reduction SUV rear spoiler is of a U-shaped plate structure; the left side and the right side are transited to the rear side from vertical circular arcs; the end faces of the left end and the right end are equal-size mounting faces, and a recess is designed in the middle; the rear spoiler and the vehicle body are mounted through the mounting surface and the recess. The middle part between recess and the front side has still opened rectangular hole, and long limit is along left right direction, makes the air current that passes through from this rectangular hole direct flow to reduce the low-pressure area of vehicle rear window rear, reduce the differential pressure resistance that the vehicle travel in-process received.

Dividing the rear spoiler into a front half part and a rear half part by taking the rear side edge of the rectangular hole as a boundary; meanwhile, the tangent line at the end points of the left end and the right end of the rectangular hole is taken as a boundary line, and the rear spoiler is divided into a left section, a middle section and a right section; the upper surface of the middle section of the front half part is a plane, and the section is a plano-convex wing section, so that the downforce loss caused by the rectangular hole is compensated, and the offset effect of the rear spoiler on the ascending force borne by the vehicle is not influenced while the pressure difference resistance is reduced.

The invention has the advantages that:

(1) the hollow-out type drag reduction and lift reduction SUV rear spoiler is characterized in that a rectangular hole is formed in the middle of the rear spoiler, and airflow is allowed to directly flow through the rectangular hole, so that a low-pressure area behind a rear window of a vehicle is reduced, and the pressure difference resistance borne by the vehicle in the driving process is reduced.

(2) The hollowed-out type drag-reducing and lift-reducing SUV rear spoiler is characterized in that the cross section of the spoiler behind the rectangular hole is designed into an inverted wing shape, so that the downforce loss caused by opening is compensated, and the offset effect of the rear spoiler on the lifting force borne by a vehicle is not influenced while the pressure difference resistance is reduced.

Drawings

FIG. 1 is a schematic top view of a hollowed-out SUV rear spoiler with resistance lowering and lift reducing functions according to the present invention;

FIG. 2 is a cross-sectional view of a hollowed-out SUV rear spoiler with resistance lowering and lift reducing functions.

In the figure:

1-mounting surface 2-recessed 3-rectangular hole

4-planoconvex airfoil section

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The hollow-out type drag reduction and lift reduction SUV rear spoiler is integrally of a U-shaped plate-shaped structure made of reinforced plastic materials; the left side and the right side are transited to the rear side by vertical circular arcs, and the radian of the circular arcs is 90 degrees. The end faces of the left end and the right end are equal-size mounting faces 1, the length of the mounting faces 1 in the left-right direction is a, a is larger than 5cm, and the specific value is determined according to the overall design length of the rear spoiler. The rear middle recess 2 is rectangular, and the long side is along the left and right direction, the length is 5a, and the width is a/2. In the rear spoiler with the structure, the left end surface, the right end surface, the middle concave part and the vehicle body are fixed, and the mass of the rear spoiler can be greatly reduced by the design of the concave part

A rectangular hole 3 is formed in the middle between the concave part and the front side, the left end and the right end of the rectangular hole 3 are circular arcs, the length of the long edge is 4a along the left-right direction, and the width of the long edge is a/5; the width of the rectangular hole 3 is equal to the distance from the front side edge of the rectangular hole 3 to the concave 2 at the middle part of the rear side; through designing this rectangular hole 3, the air current that makes the process can directly flow through from this rectangular hole 3 to reduce the low-pressure area behind the vehicle rear window, reduce the differential pressure resistance that the vehicle travel in-process received.

Dividing the rear spoiler into a front half part and a rear half part by taking the rear side edge of the rectangular hole 3 as a boundary; wherein the front half part is between the rear side edge of the spoiler and the rear side edge of the rectangular hole 3, and the rear half part is the rest part. Meanwhile, the rear spoiler is divided into a left section, a middle section and a right section by taking the tangent line at the end points of the left end and the right end of the rectangular hole 3 as a boundary, wherein the left section is the part between the left end of the rectangular hole 3 and the left side of the rear spoiler, the middle section is the part between the left end of the rectangular hole 3 and the right end, and the right section is the part between the right end of the rectangular hole 3 and the right side of the spoiler. Therefore, the outer edge thicknesses of the left section and the right section of the rear spoiler are designed to be gradually reduced from inside to outside; the thickness of the middle section of the front half part is gradually reduced from front to back, so that the section of the middle section forms an up-down inverted plano-convex airfoil section 4 with a plane top surface, as shown in fig. 2; therefore, the design of the plano-convex airfoil section at the middle section compensates the downforce loss caused by the rectangular hole 3, and ensures that the offset effect of the rear spoiler on the upgoing force borne by the vehicle is not influenced while the pressure difference resistance is reduced.

Claims

1. The utility model provides a but fretwork formula drag reduction rises spoiler behind SUV which characterized in that: is of a U-shaped plate structure; the left side and the right side are transited to the rear side from vertical circular arcs, and the radian of the circular arcs is 90 degrees; the end faces of the left end and the right end are equal-size mounting faces, and a recess is designed in the middle; the middle part between the concave part and the front side is also provided with a rectangular hole, and the long side is along the left-right direction;

the length of the long side of the recess is 5a and the width is a/2 along the left-right direction; a is the length of the mounting surface in the left-right direction; the left end and the right end of the rectangular hole are arcs, the long side is along the left-right direction, the length is 4a, and the width is a/5; the width of the rectangular hole is equal to the recessed distance from the front side edge of the rectangular hole to the middle part of the rear side;

dividing the rear spoiler into a front half part and a rear half part by taking the rear side edge of the rectangular hole as a boundary; the front half part is between the rear side edge of the spoiler and the rear side edge of the rectangular hole, and the rear half part is the rest part; the upper surface of the middle section of the front half part is a plane, and the section is a plano-convex airfoil section; the thickness of the middle section of the front half part is gradually reduced from front to back; meanwhile, the tangent line at the end points of the left end and the right end of the rectangular hole is taken as a boundary line, and the rear spoiler is divided into a left section, a middle section and a right section; the left section is a part between the left end of the rectangular hole and the left side of the rear spoiler, the middle section is a part between the left end of the rectangular hole and the right end of the rectangular hole, and the right section is a part between the right end of the rectangular hole and the right side of the spoiler; the thickness of the outer edges of the left section and the right section is gradually reduced from inside to outside; the middle section forms an up-down inverted plano-convex airfoil section with a plane top surface.

2. The hollowed-out drag-reducing and lift-reducing SUV rear spoiler of claim 1, wherein: the whole body is made of reinforced plastic materials.