Vehicle drag reduction device

• US 9,139,241 B1
• Filed: 10/17/2014
• Issued: 09/22/2015
• Est. Priority Date: 10/17/2014
• Status: Active Grant

• Current Assignee: PACCAR Incorporated
• Original Assignee: PACCAR Incorporated
• Inventors: Smith, Jeffrey P.
• Primary Examiner(s): Daniels, Jason S
• Application Number:
  US14/517,708
• Time in Patent Office: 340 Days
• Field of Search: 296/180.1, 296/180.2, 296/180.3, 296/180.4, 296/180.5
• US Class Current: 1/1
• CPC Class Codes: B62D 35/001 For commercial vehicles or tractor-trailer combinations, e.g. caravans
• CPC Class Codes: B62D 35/008 Side spoilers B62D35/001 takes precedence
• CPC Class Codes: B62D 35/02 Streamlining the undersurfaces B62D35/005, B62D35/007, B62D35/008 take precedence
• CPC Class Codes: Y02T 10/82 Elements for improving aerodynamics

Abstract

An aerodynamic component is provided in the form of one or more ground skirt sections attached to one or more underbody fairings (e.g., trailer side skirts, tractor side fairings, etc.) of a vehicle. In use, the ground effects skirt sections improve air flow underneath the vehicle, thereby reducing drag.

Claims

1. An aerodynamic device for attachment to a fairing of a vehicle, comprising:

a device body having an upright leg and a cross leg arranged so as to form an inverted T in cross section, wherein the cross leg of the inverted T is oriented generally perpendicular to a longitudinal axis of the vehicle, and wherein the upright leg is adapted to be connected to a bottom of the fairing.

2. The device of claim 1, wherein the device body is constructed out of a flexible or semi-rigid material.

3. The device of claim 1, wherein the cross leg is positioned perpendicular to the upright leg.

4. The device of claim 1, wherein the cross leg is positioned parallel with the ground surface when the device is attached to the fairing.

5. The device of claim 1, wherein the device body is configured to flex in air flow conditions such that an outwardmost end of the cross leg tilts downwardly toward a ground surface and away from the fairing.

6. The fairing assembly of claim 1, wherein the cross leg is positioned perpendicular to the upright leg.

7. The fairing assembly of claim 1, wherein the cross leg is positioned parallel with the ground surface.

8. A fairing assembly for reducing drag on an associated vehicle, comprising:

a vehicle fairing having a free end; and

a skirt section coupled to the free end of the vehicle fairing, wherein the skirt section is configured as a generally inverted T in cross section, wherein a cross leg of the inverted T is oriented generally perpendicular to a longitudinal axis of the vehicle.

9. The fairing assembly of claim 8, wherein the skirt section is constructed out of a flexible or semi-rigid material.

10. The fairing assembly of claim 8, wherein the skirt section is configured to flex in air flow conditions such that an outwardmost end of the cross leg tilts downwardly toward a ground surface and away from the fairing.

11. The fairing assembly of claim 10, wherein the skirt section is configured to return to an unflexed configuration when air flow conditions become stagnant.

12. A fairing assembly for reducing drag on an associated vehicle, comprising:

a vehicle fairing having a free end; and

a skirt section coupled to the free end of the vehicle fairing, wherein the skirt section is configured as a generally inverted T in cross section, wherein a cross leg of the inverted T includes an outer leg segment and an inner leg segment that are oriented generally perpendicular to a longitudinal axis of the vehicle,

wherein the skirt section is configured to flex between a stagnation position, wherein the cross leg is positioned generally parallel with the ground surface, and an air flow position, wherein the cross leg is tilted downwardly such that the outer leg segment is closer to the ground surface than the inner leg segment.