JP2580262B2 - Car rear spoiler device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rear spoiler device mounted on an automobile body.

(Prior Art) As is well known, in a vehicle body, a rear spoiler device is mounted on the rear portion of the vehicle body for the purpose of reducing running resistance by rectifying airflow at the rear portion of the vehicle body or enhancing tire contact force during high-speed running. There is.

FIG. 8 shows a conventional fixed-type rear spoiler disclosed in Japanese Utility Model Laid-Open Publication No. 57-94583. This rear spoiler is a set of stays A fixed to the rear of the vehicle body in a state of facing the vehicle width direction. It has a _1, between these top of the stay a _1, wing B ₁ of largely the blade section towards the underside of the length from the upper surface length of the air flow direction is fixed.

Incidentally, the aerodynamic characteristics of the fixed wing B ₁ represents, because thus identified by the wing cross section, drag coefficient of the blade section that allows the running resistance (C _D) and downward lift for tire contact force The relevant lift coefficient (C _L ) is
As shown in the figure, it is expressed as a function of the inclination of the blade section with respect to the air flow, that is, the wing angle θ.

Therefore, in the rear spoiler device as shown in FIG. 8, since a specific wing angle θ is obtained, there are two options, that is, whether to emphasize the drag coefficient (C _D ) or the lift coefficient (C _L ). It is a one-off choice.

Speaking in detail, with the rear spoiler device of the drag coefficient emphasis intended for reduction of running resistance due to rectification of the wing B ₁ as shown in the design point "a", the value of lift form (C _L) becomes very large, wings We can not ensure the tire contact force at high speeds due to the lift of B _1, also in rear spoiler device of the lift oriented as shown by the design point "b", although the tire contact resistance at high speeds is maintained And drag coefficient (C _D ) due to the generation of “vortex” behind wing B ₁ due to separation of air flow
Increase.

For this reason, a movable wing type rear spoiler device as shown in FIG. 9 has been proposed in, for example, JP-A-60-234075.

That is, in the movable wing type rear spoiler, the wing angle θ of the wing B ₂ rotatably supported by the stay A ₂ is changed according to the high speed as indicated by the temporary line, so that the wing angle θ at the time of low-speed traveling If the wing angle θ is set to the value indicated by the design point “a”, the wing angle θ moves to the position “b” as the traveling speed of the vehicle increases, so that the lift coefficient (C _L ) Since it decreases, the tire contact pressure during high-speed running can be secured.

(Problems to be Solved by the Invention) However, in the movable wing type rear spoiler device described above, even if the tire contact property during high-speed running is ensured, the drag coefficient (C _D ),
The running resistance increases and the fuel consumption rate deteriorates.

In other words, in the conventional movable wing type rear spoiler device, since a necessary contact pressure is obtained by adjusting a wing angle using a fixed wing section, there is a problem that air resistance increases with an increase in tire contact pressure.

SUMMARY OF THE INVENTION The present invention provides a rear spoiler apparatus for an automobile in which the air resistance of the wing does not increase even if the tire contact pressure is increased by the rectifying action of the air flow by the wing.

(Means for Solving the Problems) According to the present invention, in a vehicle rear spoiler device supporting a wing having a wing cross-sectional shape above a stay fixed to a rear portion of a vehicle body, a vehicle width direction constituting a lower layer of the wing cross-section A first wing extending to the first wing and an upper layer formed on the first wing to form an upper layer of a wing cross-section, and supported movably in the front-rear direction of the vehicle body so that a rear end thereof is continuous with the first wing and is inclined rearward. There is provided a second wing extending in the vehicle width direction that moves upward, and the first wing and the second wing have variable wing cross sections.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 show a first embodiment of the present invention, in which a first wing 2A is provided on a rear upper surface of a vehicle body, for example, an upper surface of a trunk lid 1. FIG.

The first wing 2A, which is integrally formed of a rigid synthetic resin and fixed to the trunk lid 1 by the fixing nut 3, comprises a pair of fixing portion stays 2a, 2b opposed in the vehicle width direction.
The fixed portion stays 2a, 2b are integrally formed with both ends wings 2d, 2e of a required wing cross section which are warped downward facing each other.

These two end wings 2d and 2e are integrally connected by fixed wings 2c extending in the vehicle width direction and constituting the lower layer of the same wing cross section as the both end wings 2d and 2e.

A pair of second wing stays 5B that support a second wing 4A that can move relatively to the fixed wing 2c is disposed immediately below both end wings 2d and 2e.

As shown in the cross section in FIG. 1, each second wing stay 5B formed as a hollow member having an open top is fixed to the crank lid 1 by a mounting nut 6, and fulcrum shafts 7, 8 are provided therein. The bases of a drive link 9 and a driven link 10 that can be rotated as a center are incorporated, and the upper ends of the drive link 9 and the driven link 10 project upward through an opening provided in the fixed wing 2c.

The second wing 4A, which is arranged on the fixed wing 2c and forms an upper layer of one wing cross section,
It extends in the vehicle width direction between 2d and 2e.

The distal ends of the drive link 9 and the driven link 10 protruding above the fixed wing 2c are engaged with mounting pins 14, 15 of a mounting bracket 13 fixed to the lower surface of the second wing 4A.

A gear 16 is fixed to the fulcrum shaft 7 of the drive link 9, and the gear 16 meshes with a worm gear 18 of a drive motor 17 installed inside the second wing stay 5B.

The drive motor 17 is rotated forward and backward by a command signal from a manual switch, and moves the second wing 4A along a movement path defined by the drive link 9 and the driven ring 10.

Inside the second wing stay 5B, stoppers 19 and 20 for restricting the movable limits of the drive link 9 and the driven link 10 are provided.

The rear spoiler device according to the first embodiment having the above-described configuration includes a fixed wing 2c of the first wing 2A and a second wing 4A.
Together form one wing, that is, a variable wing cross section.

Specifically, as shown by the solid line in FIG.
If 4A completely overlaps the fixed wing 2c and forms the same wing cross section as both ends wings 2d and 2e, and if the wing angle is set at the position where the drag coefficient of the wing is minimized, this state Since the rectifying effect of the wing can be obtained by traveling at, the air resistance is reduced and the fuel consumption rate can be reduced.

Further, the second wing 4A is moved backward with respect to the fixed wing 2c as shown by the chain line in FIG. 1 or the solid line in FIG. When the rear end of the fixed wing 2c is positioned obliquely above the rear of the fixed wing 2c, the overall wing angle of the wing does not change, but the wing cross-sectional shape itself changes and the fixed wing 2c And the wing composed of the second wing 4A, that is, the aerodynamic characteristics of the wing cross section change, so that the lift coefficient of the wing is reduced without increasing the drag coefficient to increase the tire contact pressure,
Stable steering performance, stable high-speed cornering characteristics, and a slip prevention effect in rainy weather are obtained.

In particular, according to the structure of the present embodiment, the second wing 4A completely overlaps the fixed wing 2c and forms the same one wing cross section as both ends wings 2d and 2e, so that the appearance is good and high-speed running is possible. When the second wing 4A is moved rearward at the time or the like, the substantially front half of the second wing 4A remains wrapped over the substantially rear half of the fixed wing 2c,
Since the wing section can be prevented from suddenly changing stepwise, the rectification effect and the lift effect can be further improved.

Here, it is preferable to use a flexible film 21 wound around the fixed wing 2c as shown in FIG. 2 in order to further eliminate such a sudden change in the wing cross section when the second wing 2A moves backward.

That is, the flexible film 21 is wound around the front end of the fixed wing 2c, and both ends 21a and 21b are fixed to the upper surface of the front end and the center of the lower surface of the second wing 4A as shown in FIG. When the second wing 4A moves from the state shown in FIG. 1 to the state shown in FIG. 2, the flexible film 21 is tensioned between the front end of the fixed wing 2c and the upper surface of the front end of the second wing 4A. In this state, it is possible to prevent a sudden change in the surface of the entire wing and to further improve the rectifying effect and the lift effect.

FIGS. 4 and 5 showing a second embodiment of the present invention are sectional views corresponding to FIGS. 1 and 2 of the first embodiment, respectively. It is shown with a.

That is, the rear spoiler device of the second embodiment includes a wing stay 5C corresponding to a pair of second wing stays 5A and 5B for supporting the second wing 4B.

These wing stays 5C are formed as hollow members having an open top, and are fixed to the trunk lid 1 by mounting nuts 6.

The base of a drive link 9 and a driven link 10 that can rotate around fulcrum shafts 7 and 8 are incorporated in the wing stay 5C.

The second wing 4B superposed on the first wing 2B is supported by the distal ends of the drive link 9 and the driven link 10, and a gear 16 is fixed to a fulcrum shaft 7 of the drive link 9; It meshes with a worm gear 18 of a drive motor 17 installed inside the stay 5C.

The drive motor 17 is rotated forward and reverse by a command signal from a manual switch or a command signal from a vehicle speed detector, and
Then, the second wing 4B is moved rearward and upward along the movement trajectory determined by the driven link 10.

The fixed pins 2 are fixed to the upper portion of the opposing side surface of the wing stay 5C, and the fixed pins 22 are fitted with slide grooves 23 provided on the side surface of the first wing 2B in the front-rear direction.

The front ends of the first wing 2B constituting the lower layer of one wing cross-section and the second wing 4B constituting the upper layer are vertically offset and arranged in an overlapping manner with respect to the front-rear direction, and the front end of the first wing 2B And the front end of the second wing 4B is hinge 24
Are connected by

The rear spoiler device of the second embodiment having the above-described configuration achieves both the rectification effect in the cross-sectional state of FIG. 4 and the lift effect of the wing in the cross-sectional state of FIG. 5, as in the case of the first embodiment. be able to.

Specifically, in the state of FIG. 4, the first wing 2B and the second wing 2B
The wing 4B is folded in, the first wing 2B is arranged in the lower layer and the second wing 4B is arranged in the upper layer to form one wing section to improve the rectification effect as a whole, and is also shown in FIG. When the second wing 4B is moved obliquely rearward and upward by the driving link 9 and the driven link 10 as described above, the front end of the first wing 2B is pulled by the hinge 24, and the second wing 4B is guided by the fixing pin 22 and the slide groove 23. The first wing 2B rotates forward and backward with the fixing pin 22 as a fulcrum, the rear end moves downward and forward, and the first wing 2B becomes the second wing.
Located on the extension of 4B, the wing cross-sectional shape changes without abrupt step change, thereby reducing the lift coefficient of the wing and increasing the tire contact pressure without increasing the drag coefficient.

FIG. 6 shows a third embodiment of the present invention, in which the user can manually select the wing cross-sectional shape as needed.

FIG. 6 shows a cross section corresponding to FIG. 1 of the first embodiment, in which a first wing 2C is provided above a wing stay 5D.
Is fixed.

The second wing 4C is superposed on the first wing 2C, and the first wing 2C and the second wing 4C constitute one wing section.

The second wing 4C is supported by a pair of support links 9A and 10A extending from the inside of the wing stay 5D. When the second wing 4C is grasped by hand and moved backward, it is determined by the support links 9A and 10A. The rear end is flipped up rearward and obliquely along the driving trajectory, and the front end is adjacent to the rear end of the first wing 2C.

Therefore, even in the rear spoiler device of the third embodiment, a wing cross-sectional shape having a high rectification effect can be obtained in the state shown by the solid line in FIG. 5, and the second wing 4C is positioned at the position shown by the phantom line in FIG. By changing the shape of the wing cross section without abrupt change in step, the lift coefficient can be reduced and the tire contact pressure can be increased without increasing the drag coefficient.

FIG. 7 shows a fourth embodiment of the present invention, which also allows the user to manually select the wing cross-sectional shape as needed.

FIG. 7 shows a cross section similar to that of the third embodiment, in which a first wing 2D is fixed above a wing stay 5E.

The second wing 4D is superposed on the first wing 2D, and the front end is formed so as to enclose and lock the front end of the first wing 2D.
4D forms one wing section.

The second wing 4D is pulled downward by a tension spring 26 extending from the inside of the wing stay 5E, and the first wing 2D
Placed on top polymerized.

A stopper 25 is provided at the rear upper portion of the wing stay 5E so as to be separated from the rear end of the first wing 2D.
The rear end of the second wing 4D is supported on the upper side, and the second wing 4D is moved backward while being manually pulled up against the urging force of the tension spring 26, and the front end of the second wing 4D is moved to the first end.
The fall of the rear end of the wing 2D and the stopper 25 makes it possible to set the second wing 4D in a state of being tilted rearward and upward.

Therefore, even in the rear spoiler device of the fourth embodiment, a wing cross-sectional shape having a high rectifying effect can be obtained in the state shown by the solid line in FIG. 7, and the second wing 4D is positioned at the position shown by the imaginary line in FIG. By changing the shape of the wing cross section without abrupt change in step, the lift coefficient can be reduced and the tire contact pressure can be increased without increasing the drag coefficient.

(Effect of the Invention) As described above, according to the present invention, the first layer disposed in the lower layer
The wing and the second wing overlapped on the first wing form one wing section, and the second wing is supported so as to be movable in the longitudinal direction of the vehicle body, and a rear end portion of the second wing is formed. Are moved rearward and obliquely upward while being continuous with the first wing. Therefore, when the first wing and the second wing are vertically overlapped, the rectifying effect of the wing can be obtained, while the second wing can be obtained. By moving the wing backward, the wing cross section can be changed without abrupt step change, and the lift coefficient can be reduced without increasing the drag coefficient. And a reduction in running resistance can both be realized.

In addition, as described above, the first wing and the second wing are vertically overlapped to form one wing cross section, and the second wing moves backward without any sudden step change. Since the cross-sectional shape can be changed, there is a great practical effect that the appearance is not impaired.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 3 showing a first embodiment of the present invention, and FIG. 2 is a view showing a state where the second wing of the first embodiment has moved backward. Sectional view along line II-II,
FIG. 3 is a perspective view of the first embodiment, and FIG. 4 is a second embodiment of the present invention.
FIG. 5 is a sectional view showing a moving state of the first and second wings of the second embodiment, FIG. 6 is a sectional view showing a third embodiment of the present invention, and FIG. Figure is a cross-sectional view showing a fourth embodiment of the present invention, a side view of FIG. 8 is a conventional rear spoiler device, FIG. 9 is a side view of a different example of a conventional rear spoiler device, FIG. 10 wing angle and C _D is a graph showing the relationship between C _L. 1… Trunk lid 2A ～ 2D …… First wing 4A ～ 4D …… Second wing

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Ono 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) References Patent 127969 (JP, C2)

Claims (1)

(57) [Claims] 1. A rear spoiler apparatus for an automobile, wherein a wing having a wing cross section is supported on an upper portion of a stay fixed to a rear portion of a vehicle body, a first wing extending in a vehicle width direction which forms a lower layer of the wing cross section, and the first wing. An upper layer is arranged on the upper side to form an upper layer of the wing cross section, and is supported so as to be movable in the longitudinal direction of the vehicle body, and extends in the vehicle width direction moving rearward and obliquely upward in a state where the rear end portion is continuous with the first wing. A rear spoiler device for an automobile, comprising a second wing, wherein a wing cross section is variable between the first wing and the second wing.