DESC:FIELD OF THE INVENTION
[001] The present disclosure generally relates to a cost-effective bus aerodynamics system and method of manufacturing thereof. More particularly, the present disclosure relates to the bus aerodynamics system to improve aerodynamics of the bus and reduce drag at the rear potion of the vehicles, preferably commercial passenger vehicle.
BACKGROUND
[002] Fuel efficiency is the most valued and crucial need of each user and on the contrary, it is the biggest challenge for the vehicle manufacturer. Further due to box type geometry of the commercial vehicle, the commercial vehicles specifically passenger vehicles are generating more drag than any other geometrical shape vehicles. Also, it is known that still there are several ways to reduce drag coefficient of the vehicle by optimizing shape or by using drag reduction devices. Therefore, commercial passenger vehicles are largely with rectangular shape and rectangle has one of the highest drag coefficients. The drag reduction devices are used preferably at the front and the rear of the vehicles, which creates another challenge of aesthetics as it affects bumpers at the front as well as rear. To reduce drag with no compromise on aesthetics of the bus. There is an unmet need of such type of bus aerodynamic system, which can increase fuel efficiency up to 10%, preferably 3% to 7% by reducing drag and without compromising on the aesthetic features of the bus.
[003] BRIEF SUMMARY
[004] In general, aerodynamic is the study of air in motion affected by different shapes and sizes. Aerodynamics is largely dependent on body profile; how good it is managed. Air travel according to the shape or profile and create drag.
[005] In one embodiment, the present subject matter discloses an improved aerodynamics structure for commercial vehicle comprising an optimal drag co-efficient aerodynamics structure and a triangular with an arc to support the air flow and guide the high-pressure air at rear of the vehicle by avoiding additional drag reduction device without compromising aesthetic feature of the commercial vehicle. The commercial vehicle characterized by optimal profile of triangular with an arc to support the air flow and guide the high-pressure air at rear of the vehicle by avoiding additional drag reduction device without compromising aesthetic feature of the commercial vehicle.
[006] Here the improved aerodynamics structure for commercial vehicle comprising an integrated bumper with drag reduction device configured at the rear portion of the commercial vehicle to minimize the air pressure at the rear portion of the commercial vehicle.
[007] The improved aerodynamics structure for commercial vehicle further characterized by increase fuel efficiency up to 10%, preferably 3% to 7% by reducing drag and without compromising on the aesthetic features of the commercial vehicle.
DESCRIPTION OF DRAWINGS
[008] FIG .1 refers to a generic streamline (RHS to LHS) of a commercial passenger vehicle, while moving air stream moves towards front to rear from all around the vehicle. The present invention is targeted to optimize downstream (air passing through bottom of the vehicle) and direct it to the low-pressure zone generated at the rear of the vehicle. This low-pressure zone resulted to drag and affect fuel efficiency. By directing streams to the low-pressure zone, drag can be reduced.
[009] Similarly, FIG. 2 shows the position of the integrated bumper with drag reduction device. It is placed at the rear location in accordance with direct stream to the low-pressure zone and be maximum beneficial to the vehicle.
[0010] FIG. 3 demonstrates the first in industry construction of the rear bumper with drag reduction device. FIG. 3(a, b, c) shows the front side and top view of the device. FIG. 3d shows the isometric view of the device. The construction of bumper/device is in accordance to fulfill its purposes. Unique profile of the device is triangular with an arc (FIG. 3b) to support the air flow and guide the high-pressure air at rear of the vehicle.
[0011] Outside passage reducing cross section of outside passage (FIG. 4) creates narrow outlet at the end, which generate turbulence and increases pressure of the outlet air. This outlet air instantly guided into the low-pressure zone (drag zone) to reduce the drag force applied on the vehicle. The surface of outside passage guide air to the outlet which is notch type section creates high pressure air. Arc profile of overall section guides this turbulent air to drag zone.
[0012] Inside passage -Inside passage is different as it comprises expanding section (FIG. 4) on fins but guides moving air directly to low pressure zone by reducing section towards slot opening. This results more volume in low pressure zone and helps more effectively for reducing drag. The other function of this expanding section is to manage the lifting force generated by outside passage and act as a bumper also. Expanding section provides better mounting and visibility of bumper peripherals. This reduces drag without affecting much the current stability of the vehicle. The arc profile is optimized for better flow and negligible resistance to moving air.
[0013] Slot for inside passage - The inside passage is covered by a top cover (FIG. 4) to direct the moving air towards the rear and uniquely position slot and arc profile opens directly at the low-pressure zone (FIG. 7). This increases the efficiency of the device as well as fuel efficiency. Top cover also supports the mounting of the device on vehicle.
[0014] Aerodynamics is largely dependent on geometry/shape/size of the components, because dynamics works same regards any industry or vehicles. Titled invention is also cultivation of the same thought process. It is the shape which makes it unique and efficiency to the function it serves.
[0015] As mentioned in FIG. 1 & FIG. 2 earlier, FIG. 5 shows the detailed view of device position at rear of the vehicle. Slot position of the device kept outside of the rear end to direct flow into the low-pressure zone. FIG. 6 shows the streamlines for outside passage. Notch at the end of outside passage direct the air to the low-pressure zone. Moving air streamlined by narrow section of the outside passage. FIG. 7 shows the streamline for inside passage which is compressed inside the section and moves out from the slot directly in the low-pressure zone. This increases functional ability (efficiency) of the device. FIG. 8 shows the overall streamlines for the vehicle with device installed. It is evident that low pressure zone shown in FIG. 1 is now reduced with device as air is directed into.
[0016] Working mechanism: When vehicle moves forward, air travels around the vehicle (FIG. 1).
[0017] As per the geometry of the vehicle, air creates low pressure zone behind the vehicle (FIG.1). This low pressure creates temporary vacuum or low pressure and pulls the vehicle behind. To overcome it vehicle needs more power and thus consume more fuel.
[0018] As shown in FIG. 10, when vehicle moves, air in the downstream moves to the rear and comes into the drag reduction device. Air received at the device inlet, splits into two passages. The inside and outside passages guide this moving air into the low-pressure zone with the help of its geometry. Inside passage air moves as shown in FIG. 7 and outside passage air moves as shown in FIG. 6 Device as shown in FIG. 10 reduce the low-pressure zone by filling in more air into and reduce the pull force (Drag). As vehicle reaches the high speed e.g. 80-100km/h, efficiency of the devise increases. It is known that drag also increases at the high speed compared to low speed.
[0019] Although the present disclosure is described in terms of certain preferred embodiments and examples, other embodiments and examples will be apparent to those of ordinary skill in the art, given the benefit of this disclosure, including embodiments and examples that do not provide all of the benefits and features set forth herein, which are also within the scope of this disclosure. It is to be understood that other embodiments may be utilized, without departing from the true spirit and scope of the present invention.
[0020] It is to be understood that other embodiments of the present disclosure will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only various embodiments of the disclosure by way of illustration. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
[0021] It would become abundantly clear to a person in the art, after reading this specification that the present subject matter also provides discloses an improved aerodynamics structure for commercial vehicle and method of manufacturing thereof. More specifically, the present subject matter discloses an improved aerodynamics structure for commercial vehicle comprising an optimal drag co-efficient aerodynamics structure and a triangular with an arc to support the air flow and guide the high-pressure air at rear of the vehicle by avoiding additional drag reduction device without compromising aesthetic feature of the said commercial vehicle effectively and without departing from the spirit of the present subject matter. While the subject matter may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described herein. Alternate embodiments or modifications may be practiced without departing from the spirit of the present subject matter. The drawings shown are schematic drawings and may not be to the scale. While the drawings show some features of the subject matter, some features may be omitted. Alternatively, in some other cases some features may be emphasized while others are not. Further, the methods disclosed herein may be performed in manner and/or order in which the methods are explained. Alternatively, the methods may be performed in manner or order different than what is explained without departing from the spirit of the present subject matter. It should be understood that the subject matter is not intended to be limited to the particular forms disclosed. Rather, the subject matter is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter.
Yours Faithfully

ANIL KUMAR PANDEY
(IN P/A 2359)
AGENT FOR THE APPLICANT(S)
,CLAIMS:We claim:

1) An improved aerodynamics structure for commercial vehicle comprising:
a) an optimal drag co-efficient aerodynamics structure; and
b) a triangular with an arc to support the air flow and guide the high-pressure air at rear of the vehicle by avoiding additional drag reduction device without compromising aesthetic feature of the said commercial vehicle.

2) The improved aerodynamics structure for commercial vehicle as claimed in Claim 1, wherein integrated bumper with drag reduction device configured at the rear portion of the commercial vehicle to minimize the air pressure at the rear portion of said commercial vehicle.
3) The improved aerodynamics structure for commercial vehicle as claimed in Claim 1, wherein said commercial vehicle characterized by optimal profile of triangular with an arc to support the air flow and guide the high-pressure air at rear of the vehicle by avoiding additional drag reduction device without compromising aesthetic feature of said commercial vehicle.
4) The improved aerodynamics structure for commercial vehicle as claimed in Claim 1, wherein said commercial vehicle characterized by increase fuel efficiency up to 10%, preferably 3% to 7% by reducing drag and without compromising on the aesthetic features of said commercial vehicle.

Yours Faithfully

ANIL KUMAR PANDEY
(IN P/A 2359)
AGENT FOR THE APPLICANT(S)