Description:Field of Invention
[001] The invention relates to exhaust system of commercial vehicles. It more particularly relates to attachments provided to the engine exhaust to reduce noise being emitted from the engine exhaust when the commercial vehicle is being operated.
Background of the Invention
[002] Reducing noise emitted by internal combustion engines has been a longstanding goal for design engineers, as this noise impacts the comfort of vehicle occupants. With established noise level regulations for vehicles, there has been an ongoing effort to develop more effective noise reduction solutions since the introduction of internal combustion engine vehicles. These efforts have often focused on minimizing specific resonant frequencies that contribute to vehicular noise pollution. However, conventional solutions tend to be less effective at addressing the unwanted sounds produced in the lower frequency range, such as those generated by engine exhaust or turbulent airflow.
[003] Some conventional methods for addressing the problem of exhaust noise involve using restrictive silencers. These silencers are designed in a way that limits the uninterrupted flow of exhaust gases, resulting in back pressure that can negatively impact the performance of internal combustion (IC) engines. While there are traditional solutions to this issue, cost constraints often prevent the ideal solution from being consistently applied across all vehicles. Therefore, unless a proposed solution is not only easy to manufacture but also easy to maintain, it may face challenges in implementation. Many end users may be reluctant to pay for expensive components. Given that our country has a large number of price-sensitive customers, the demand for an affordable yet effective solution for noise reduction in IC engines remains a long-standing and unresolved issue.
[004] Given the constraints of vehicle design, there may not always be enough space to install a large noise reduction device. This limitation opens up the possibility of using another category of conventional solutions in most vehicles powered by internal combustion (IC) engines. The challenge is linked to manufacturing ease, as a smaller and simpler construction can effectively address the issue of insufficient space and weight allocation for larger noise reduction devices. Additionally, a noise reduction attachment with a more compact and straightforward design is likely to be more adaptable for use in various vehicles compared to larger conventional options.
[005] Another category of silencers currently available on the market utilizes materials strategically placed inside the body of the silencers to absorb noise generated by internal combustion (IC) engines. The main drawback of these solutions is that the absorbing materials eventually degrade over time, leading to a decline in their effectiveness. As a result, such silencers need to be replaced periodically. Due to this potential for degradation, these solutions may not be suitable for vehicles where customers prioritize durability, low maintenance costs, and affordability in manufacturing and sales. Therefore, the objective of the present invention is to provide a noise reduction device for IC engine-powered vehicles that features a simple yet durable design, while also being highly effective in managing noise across a broader frequency range.
[006] It is another objective of the present invention to provide a noise-reduction device for IC engine-powered vehicles that is small in size and, hence, easy to provide in a wide variety of vehicles.
[007] It is still another objective of the present invention to provide a noise reduction device for IC engine-powered vehicles that are easy to manufacture and utilise in many categories of vehicles, thereby also making them very economical.
[008] It is yet another objective of the present invention to provide a noise reduction device for IC engine-powered vehicles that can deal with noise from a wider range of sound frequencies, effectively coping with noise emerging for a wider variety of reasons.
Summary of the Invention
[009] An embodiment of the invention achieving the stated objective, that is, a noise tuning device for the exhaust system of a commercial vehicle (100), comprises of an attachment portion (5), a curved tubular body (10), a curved deflector (15), a narrow attachment tube (25), and a hollow chamber (30). In the noise tuning device for the exhaust system of a commercial vehicle (100), the attachment portion (5), being a plate having a regular shape and a central opening, is fixed on one end of the curved hollow tubular body (10). The curved tubular body (10), in its first curved portion (10A), is provided with a narrow attachment tube (25) that projects perpendicularly from the surface of the first curved portion (10A) of the curved tubular body (10). The narrow attachment tube (25) opens into a hollow chamber (25) formed by a cylindrical body that receives and is fixed upon one end of the narrow attachment tube (25) and whose other end is closed. The curved deflector (15) is fixed on the other end of a second curved portion (10B) of the curved tubular body (10), the second curved portion (10B) of the curved tubular body (10) merges with the end of the first curved portion (10A) at its first end thereby forming a narrow cylindrical transition portion (10C).
Brief Description of Drawings
[0010] The present invention is illustrated in the accompanying drawings that contain references numerals for indicating its various parts. The description of the present invention would therefore be better understood with reference to accompanying diagrams, wherein
[0011] Figure 1 discloses a first isometric view of the preferred embodiment of the present invention.
[0012] Figure 2 discloses a second isometric view of the preferred embodiment of the present invention.
[0013] Figure 3 discloses a third isometric view of the preferred embodiment of the present invention.
[0014] Figure 4 discloses a cut section view of the preferred embodiment of the present invention.
Detailed Description of the Invention
Referring to the set of figures 1 and 2, the noise tuning device for the exhaust system of a commercial vehicle (100) comprises of, an attachment portion (5), a curved tubular body (10), a curved deflector (15), a narrow attachment tube (25), and a hollow chamber (30).
[0015] Referring to figures 1 and 2, the attachment portion (5), being a plate having a regular shape and a central opening, is fixed on one end of the curved hollow tubular body (10). The attachment portion (5) can be configured to have shapes selected from triangular, square and circular. The attachment portion (5) is provided with openings that allow said attachment portion (5) to be linked to the exhaust pipe using conventional fastening means. The conventional fastening means are selected from nuts and bolts of standard sizes. The curved tubular body (10), in its first curved portion (10A), is provided with a narrow attachment tube (25) that projects perpendicularly from the surface of the first curved portion (10A) of the curved tubular body (10). This feature enables firm contact between the interfacing surface of the attachment portion (5) and the vehicle's exhaust pipe.
[0016] The narrow attachment tube (25) (refer to Figure 4) opens into a hollow chamber (30) formed by a cylindrical body that receives and is fixed upon one end of the narrow attachment tube (25) and whose other end is closed. The curved deflector (15) is fixed on the other end of a second curved portion (10B) of the curved tubular body (10), the second curved portion (10B) of the curved tubular body (10) merges with the end of the first curved portion (10A) at its first end thereby forming a narrow cylindrical transition portion (10C).
[0017] Referring to figures 2 and 3, the curved deflector (15) is provided with a narrow neck along its lower surface where said curved deflector (15) connects with the other end of the second curved portion (10B). The curved deflector (15) has a curved V-shaped opening (20) that begins from said curved deflector (15)’s neck and ends at the open end of the curved deflector (15). The curved deflector (15) transitions into having a rough M-shaped profile above its neck, with a bottom open portion of the roughly M-shaped profile being formed by the curved V-shaped opening (20).
[0018] Referring to Figures 2, 3 and 4, the other end of the curved deflector (15) portion, having a roughly M-shaped profile, curves towards the V-shaped opening (20), thereby obscuring the central opening of the curved tubular body (10). To provide the best noise attenuation performance, the dimensions of the noise tuning device for the exhaust system of a commercial vehicle (100) are configured to follow the relation:
a. neck diameter is directly proportional to the frequency to be attenuated,
b. the volume of the chamber (15) is inversely proportional to the frequency to be attenuated,
c. the volume of the chamber (15) is directly proportional to the noise level attenuation and
d. the neck length of the narrow attachment tube (25) is inversely proportional to the frequency to be attenuated.
[0019] The noise tuning device for the exhaust system of a commercial vehicle (100), having the construction as described herein, is fixed on the exhaust pipe along the attachment portion (5). The exhaust can hence flow within the curved tubular body and out of it through the curved deflector (15). The narrow attachment tube (25) (refer to Figure 4) opening into a hollow chamber (30) allows some of the sound coming out of the exhaust pipe to enter and then exit it out of phase with the rest of the sound coming out of the exhaust pipe, thereby enabling passive destructive interference of noise along a wider frequency range. The described construction is easy to manufacture and can be provided economically for any vehicle.
[0020] Technical advantages offered by the invention, i.e., the noise tuning device for the exhaust system of a commercial vehicle (100) are-
- It features a simple yet durable design while also being highly effective in managing noise across a broader frequency range.
- It is small in size and, hence, easy to provide in a wide variety of vehicles.
- It is easy to manufacture and utilise in many categories of vehicles, thereby also making it very economical.
- It can deal with noise from a wider range of sound frequencies, effectively coping with noise emerging for a wider variety of reasons.
[0021] The disclosed invention, i.e. the noise tuning device for the exhaust system of a commercial vehicle (100), achieves all the set-out objectives.
[0022] It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the present invention has been herein described in terms of its preferred embodiment, those skilled in the art will recognize that the preferred embodiment herein disclosed, can be practiced with modifications within the scope of the invention herein described.
, Claims:We Claim,
1. A noise tuning device for the exhaust system of a commercial vehicle (100) comprising,
• an attachment portion (5),
• a curved tubular body (10),
• a curved deflector (15),
• a narrow attachment tube (25),
• a hollow chamber (30),
wherein,
- the attachment portion (5), being a plate having a regular shape and a central opening, is fixed on one end of the curved hollow tubular body (10);
- the curved tubular body (10), in its first curved portion (10A), is provided with a narrow attachment tube (25) that projects perpendicularly from the surface of the first curved portion (10A) of the curved tubular body (10);
- the narrow attachment tube (25) opens into a hollow chamber (30) formed by a cylindrical body that receives and is fixed upon one end of the narrow attachment tube (25) and whose other end is closed and
- the curved deflector (15) is fixed on the other end of a second curved portion (10B) of the curved tubular body (10), the second curved portion (10B) of the curved tubular body (10) merges with the end of the first curved portion (10A) at its first end thereby forming a narrow cylindrical transition portion (10C).
2. The noise tuning device for the exhaust system of a commercial vehicle (100) as claimed in claim 1, wherein,
- the curved deflector (15) is provided with a narrow neck along its lower surface where said curved deflector (15) connects with the other end of the second curved portion (10B);
- the curved deflector (15) has a curved V-shaped opening (20) that begins from said curved deflector (15)’s neck and ends at the open end of the curved deflector (15); and
- the curved deflector (15) transitions into having a rough M-shaped profile above its neck, with a bottom open portion of the roughly M-shaped profile being formed by the curved V-shaped opening (20).
3. The noise tuning device for the exhaust system of a commercial vehicle (100) as claimed in claim 2, wherein the other end of the curved deflector (15)’s portion, having a roughly M-shaped profile, curves towards the V-shaped opening (20) thereby obscuring the central opening of the curved tubular body (10).
4. The noise tuning device for the exhaust system of a commercial vehicle (100), as claimed in claim 3, wherein the dimensions are configured to follow the relation, neck diameter is directly proportional to the frequency to be attenuated, the volume of the chamber (15) is inversely proportional to the frequency to be attenuated, the volume of the chamber (15) is directly proportional to the noise level attenuation, and the neck length of narrow attachment tube (25) is inversely proportional to the frequency to be attenuated.
5. The noise tuning device for the exhaust system of a commercial vehicle (100), as claimed in claim 4, wherein the attachment portion (5) can be configured to have shapes selected from triangular, square and circular.
6. The noise tuning device for the exhaust system of a commercial vehicle (100), as claimed in claim 5, wherein the attachment portion (5) is provided with openings that allow said attachment portion (5) to be linked to the exhaust pipe using conventional fastening means.
7. The noise tuning device for the exhaust system of a commercial vehicle (100), as claimed in claim 6, wherein the conventional fastening means are selected from nuts and bolts of standard sizes.
Dated 11th day of February 2025

VIDIT CHOUBEY
(IN P/A 5566)
AGENT FOR THE APPLICANT(S)

To,
The Controller of Patents,
The Patent Office, at Mumbai