JP2017202750A - Vehicle aerodynamic characteristic optimization device using movable plate-shaped arch member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install means for optimizing an aerodynamic characteristic such as a yaw resistance characteristic and a roll resistance characteristic against a crosswind blown to a vehicle at a front end part of a vehicle without impairing the external appearance of the vehicle while taking into consideration that the front end part of the vehicle is the most sensitive with respect to the yaw moment and the roll moment by eliminating a risk that, when the vehicle receives the cross wind during traveling, the vehicle may cause a yaw change and rolling by receiving the yaw moment and the roll moment.SOLUTION: There is provided a plate-shaped arch member which is movable between a position in which the member is accommodated in a wheel arch along a peripheral wall of the wheel arch, and a position in which a part of the member is protruded to the outside of the wheel arch.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for optimizing aerodynamic characteristics such as anti-yaw characteristics and anti-roll characteristics against a crosswind of a vehicle.

  For the purpose of reducing the air resistance acting when the vehicle is traveling at high speed, the wheel is projected along with the rotation of the wheel by projecting toward the wheel at a position on the rear side of the vehicle relative to the rotation axis of the wheel in the wheel house of the vehicle. It is possible to provide a stepped portion that presents a collision surface against which an air flow toward the house collides, detect the traveling state of the vehicle by the detecting means, and adjust the amount of protrusion of the stepped portion to the wheel side based on the detection result. It is described in the following Patent Document 1. Further, in Patent Document 2 below, in a vehicle in which a large space is left above the wheels in the wheel arch, such as an off-road vehicle, a large number of vortices are generated in the space during high-speed traveling, and the running resistance of the vehicle is reduced. Addressing the increase, it is described to provide a movable wheel arch fairing between a position protruding into the wheel arch and a position stored in the fender portion of the body.

JP 2009-149130 A JP-A-8-318876

  If a vehicle is blown by a crosswind while traveling, it may receive a yaw moment or a roll moment, resulting in a yaw change or rolling. The front end of the vehicle is most sensitive to the yaw moment, and the front end is most sensitive to the roll moment in a general passenger car.

  An object of the present invention is to optimize the aerodynamic characteristics such as the anti-yaw characteristic and the anti-roll characteristic against the cross wind of the vehicle by means provided at the front end portion of the vehicle.

  In order to solve the above-described problems, the present invention provides a plate-like arch member that is movably provided between a position stored in the wheel arch along a peripheral wall of the wheel arch and a part of the wheel arch projecting out of the wheel arch. The present invention proposes an apparatus for optimizing aerodynamic characteristics of a vehicle against crosswinds.

  The plate-like arch member may be protruded out of the wheel arch only on the side receiving the crosswind of the vehicle according to the deflection angle of the crosswind with respect to the vehicle.

  The plate-like arch member may protrude out of the wheel arch on both sides of the vehicle.

  As described above, the device for optimizing the aerodynamic characteristics with respect to the crosswind of the vehicle is provided movably between the position stored in the wheel arch along the peripheral wall of the wheel arch and the position where a part protrudes outside the wheel arch. If the plate-shaped arch member is provided, the vehicle in which it works most effectively as a means for generating a drag that suppresses the yaw change and rolling of the vehicle against the yaw moment and roll moment received by the vehicle from the crosswind. Can be obtained as a means incorporated in the front end of the vehicle without impairing the appearance of the vehicle.

  If the plate-like arch member protrudes outside the wheel arch only on the side receiving the crosswind of the vehicle according to the deflection angle of the crosswind with respect to the vehicle, the yaw moment and roll moment due to the crosswind are greatly suppressed as described in detail below. be able to.

  If the plate-like arch member protrudes out of the wheel arch on both sides of the vehicle, the yaw moment and roll moment due to the crosswind can be stably suppressed regardless of the deflection angle of the crosswind as described in detail below. it can.

It is a perspective view which shows the vehicle incorporating the aerodynamic characteristic optimization apparatus with respect to a cross wind by this invention in the state in which the plate-shaped arch member protruded out of the wheel arch. It is a graph which shows the example of an experimental result of the yaw moment suppression effect in case a plate-shaped arch member protrudes out of a wheel arch only on one side of vehicles. It is a graph which shows the example of an experimental result of the roll moment suppression effect in case a plate-shaped arch member protrudes out of a wheel arch only in one side of vehicles. It is a graph which shows the experimental result example of the yaw moment suppression effect in case a plate-shaped arch member protrudes out of a wheel arch in the both sides of a vehicle. It is a graph which shows the example of an experimental result of the roll moment suppression effect in case a plate-shaped arch member protrudes out of a wheel arch in both sides of vehicles.

  As described above, the device for optimizing the aerodynamic characteristics with respect to the crosswind of the vehicle according to the present invention includes the position where the plate-shaped arch member is stored in the wheel arch along the peripheral wall of the wheel arch and the position where a part protrudes outside the wheel arch. The plate-shaped arch member 10L partially protrudes outside the wheel arch as shown in FIG. 1 on the left side of the vehicle. Although not visible in the drawing, a part of the plate-like arch member protrudes out of the wheel arch similarly on the right side of the vehicle. The left and right plate-shaped arch members are moved separately or simultaneously between the retracted position and the protruding position by a driving device not shown in the drawing. When the plate-like arch member is in a position protruding partly out of the wheel arch in this way, the vehicle is resistant to the yaw moment and roll moment received by the vehicle from the crosswind by the plate-like arch member without impairing the appearance of the vehicle. Drag can be generated to suppress yaw changes and rolling.

  FIG. 2 is an example of an experimental result of the yaw moment suppression effect when the plate-like arch member protrudes out of the wheel arch only on one side of the vehicle. The horizontal axis is the deflection angle of the transverse wind with respect to the longitudinal direction of the vehicle. The positive deflection angle is when the plate-like arch member protrudes to the side receiving the transverse wind, and the minus deflection angle is the plate-like arch member. Is projected to the side opposite to the side receiving the crosswind. The vertical axis represents the yaw moment coefficient, which is a dimensionless number that represents the yaw moment actually generated in the vehicle as a ratio to the geometrically calculated value of the yaw moment that the vehicle receives due to the crosswind. The characteristic line by the solid line in the graph is the case where the protruding amount of the plate-shaped arch member is 0. As the protruding amount of the plate-shaped arch member increases, the characteristic line shifts to a one-dot chain line, a two-dot chain line, and a broken line diagram. To do. As can be seen from the experimental results, if the plate-like arch member protrudes only to the side receiving the cross wind according to the deflection angle of the cross wind, a great yaw moment suppressing effect can be obtained.

  FIG. 3 is a graph showing an example of the experimental result of the roll moment suppression effect when the plate-like arch member protrudes outside the wheel arch only on one side of the vehicle in the same manner as in FIG. The roll moment coefficient is a dimensionless number that represents the roll moment actually generated in the vehicle as a ratio to the geometrically calculated value of the roll moment that the vehicle receives due to the crosswind. From this experimental result, if the plate-like arch member protrudes only to the side receiving the cross wind according to the deflection angle of the cross wind, the roll moment can be greatly suppressed.

  FIG. 4 is a graph showing an example of the experimental result of the yaw moment suppression effect when the plate-like arch member protrudes out of the wheel arch on both sides of the vehicle in the same manner as in FIG. As can be seen from the experimental results, if the plate-shaped arch member protrudes out of the wheel arch on both sides of the vehicle, the maximum value of yaw moment suppression protrudes out of the wheel arch only on one side where the plate-shaped arch member receives the crosswind of the vehicle. However, the stable yaw moment suppressing effect is obtained as a whole regardless of the deflection angle of the cross wind.

  FIG. 5 is a graph showing an example of the experimental result of the roll moment suppression effect when the plate-like arch member protrudes out of the wheel arch on both sides of the vehicle in the same manner as in FIG. As can be seen from the experimental results, if the plate-shaped arch member protrudes out of the wheel arch on both sides of the vehicle, the maximum suppression of the rollment is also outside the wheel arch only on one side where the plate-shaped arch member receives the crosswind of the vehicle. Although it is smaller than the case of projecting to the side, a stable roll moment suppressing effect as a whole can be obtained regardless of the deflection angle of the cross wind.

  In addition, although the experimental result shown in FIGS. 2-5 is a result at the time of incorporating a plate-shaped arch member in the wheel arch part of a front wheel, as shown in FIG. 2, especially the side where the cross wind is sprayed and Since the plate-like arch member protruding to the opposite side has an action to increase the yaw effect due to wind, by incorporating the plate-like arch member into the wheel arch part of the rear wheel and appropriately controlling the protrusion, Control for diversifying the yaw characteristics of the vehicle is also possible.

  While the invention has been described in detail with reference to embodiments, it will be apparent to those skilled in the art that various modifications can be made to the embodiments within the scope of the invention.

  10L ... Plate-shaped arch member

Claims (1)

  An aerodynamic force against a crosswind of a vehicle characterized by having a plate-like arch member movably provided between a position stored in the wheel arch along a peripheral wall of the wheel arch and a part protruding out of the wheel arch A device that optimizes properties.

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