The present disclosure relates generally to a field of a sound attenuating device for engine. More specifically, it pertains to a compact sound attenuating device which works effectively within given space constraint by diminishing varying frequencies of sound produced by an exhaust fluid under different load conditions of an engine.
BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] In an agricultural vehicle, such as tractor, sound pressure waves are generated when exhaust valves in an engine open repeatedly, thereby allowing high pressure fluid into exhaust pipe of the engine. Tractor is mostly used for carrying out various agricultural operations such as ploughing, tilling, discing, harrowing, planting, cleaning snow, pulling agricultural implements or trailers, and other similar tasks. Tractor produces low, medium, and high frequency sound waves depending upon different load conditions at which tractor operates. Moreover, sound of an exhaust fluid under load becomes unpleasant specifically due to dominance of mid-range frequencies in 3 cylinder & 4 cylinder diesel engines.
[0004] Noise of burning hot exhaust fluid exiting from an engine at high speed is abated by a series of passages and chambers of an acoustic device. An acoustic device is engineered to reduce sound pressure waves of an exhaust fluid created by an engine with acoustic quieting. In general, sound waves propagating along an exhaust pipe are attenuated using either an absorptive acoustic device or a reactive acoustic device. An absorptive acoustic device uses a perforated pipe wrapped with sound absorbing material to take acoustic energy out of the exhaust

fluid. Reactive acoustic device, commonly used in tractor, reflects a portion of incident sound waves of an exhaust fluid back towards source, which prevents sound of an exhaust fluid from being transmitted from an acoustic device.
[0005] In an existing technology, a reactive acoustic device is capable of diminishing high and mid frequency sound waves, which are produced by an exhaust fluid of a vehicle engine. However, an agricultural vehicle engine also produces Low and Medium frequencies sound waves under different load conditions. In order to diminish Low and medium frequencies of sound waves, length of an acoustic device has to be increased substantially. Main problem with an existing technology is that increasing length of an acoustic device requires extra space and also increases overall cost.
[0006] In another existing technology, an acoustic device comprises guide member which suppresses sound by increasing pressure drop of an exhaust fluid coming out from an engine. Main disadvantage with existing technology is that pressure drop beyond a threshold limit also causes a substantial decrease in efficiency of an agricultural vehicle engine and overall efficiency of an agricultural vehicle.
[0007] There is, therefore, a need in the art to provide a compact and cost
effective sound attenuating device for an engine that would be accommodated within given space constraint by suppressing sounds of varying frequencies produced by an agricultural vehicle engine at different load conditions.
OBJECTS OF THE INVENTION
[0008] A general object of the present disclosure is to provide an efficient and economical solution for attenuating sound of varying frequencies produced under different load conditions of an engine.
[0009] Another object of the present disclosure is to provide a compact sound attenuating device for engine for attenuating sound of low, medium, and high frermencies

[0010] Another object of the present disclosure is to provide a sound attenuating device for engine which attenuates sound of an exhaust fluid without using pressure differential thereby keeping pressure drop at minimum in exhaust fluid emitted from an engine.
[0011] Another object of the present disclosure is to provide a sound attenuating device which attenuates sound of an exhaust fluid without decreasing efficiency of an engine and overall efficiency of an agricultural vehicle.
[0012] Another object of the present disclosure is to provide a sound attenuating device which attenuates sound of an exhaust fluid without increasing volumetric space and length of the device.
[0013] Another object of the present disclosure is to provide a sound attenuating device which decreases back pressure of the exhaust fluid.
[0014] Another object of the present disclosure is to provide a sound attenuating device which increases Power Take Off (PTO) shaft power.
[0015] These and other objects of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY
[0016] Aspects of the present disclosure relate to a sound attenuating device for engine. More specifically, it pertains to a compact sound attenuating device which works effectively within given space constraint by diminishing varying frequencies of sound produced by an exhaust fluid under different load conditions of an engine.
In an aspect, the present disclosure elaborates upon a sound attenuating device for engine, the sound attenuating device A sound attenuating device may include a housing may be configured with an inlet pipe adapted to admit an exhaust fluid from the engine. A plurality of obstruction vanes may be arrayed at a predefined distance with each other to make a plurality of partitions in the housing. An at

least one conduit may be extending longitudinally across the plurality of obstruction vanes and the plurality of partitions may be along the housing. A jet means, with designed diameter and length, configured with the plurality of obstruction vanes. The jet means may be adapted to increase the exhaust fluid flow rate. A resonator assembly, with designed dimensions, may be configured at right angle with the housing and opening in the plurality of partitions.
[0017] In an aspect, an outlet pipe may be configured with the plurality of partitions such that positioning and arrangement of the plurality of obstruction vanes and the at least one conduit, in combination with the jet means and the resonator assembly may enable sound attenuation of the exhaust fluid flowing from the inlet pipe through the housing to the outlet pipe.
[0018] In an embodiment, the plurality of partitions may include a first partition, a second partition, a third partition, and a fourth partition may be arrayed along the longitudinal axis of the housing, and the first partition may be configured with the inlet pipe, and the fourth partition may be configured with the resonator assembly and the outlet pipe.
[0019] In an embodiment, the first obstruction vanes may be configured with the jet means, and the plurality of obstruction vanes may be configured with plurality of opening, and the first partition, the second partition, the third partition, and the fourth partition may be in fluidic communication with each other.
[0020] In an embodiment, the dimensions of the jet means may be configured to enable noise cancellation by creating a masking noise inside the housing.
[0021] In an embodiment, the inlet pipe may be configured with a plurality of first holes to enable flow of the exhaust fluid in the first partition.
[0022] In an embodiment, the at least one conduit may be configured with a plurality of second holes may be positioned in the first partition and the fourth partition may be configured with plurality of third holes, and the at least one conduit may be in fluidic communication with the first partition, and the fourth
nartiti r\r
[0023] In an embodiment, a periphery of the at least one conduit may be configured with a fourth hole such that the fourth hole may be positioned in the second partition, and may be proximal to the first obstruction vanes.
[0024] In an embodiment, the resonator assembly may include a receptacle and a neck pipe, such that the neck pipe extends upwards from the receptacle and may be positioned at right angle to the housing in the fourth partition, and designed dimension and right angle position of the resonator assembly may enable cancellation of target frequencies.
[0025] In an embodiment, the at least one conduit may be configured with a one or more disc members coupled at the ends of the at least one conduit such that the one or more disc members may enable forced entry of the exhaust fluid from the plurality of second holes and forced exit of the exhaust fluid from the plurality of third holes.
[0026] In an embodiment, the device may be adapted to decrease back pressure of the exhaust fluid thereby increasing Power Take Off (PTO) shaft power.
[0027] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[0028] All the above need to work in conjunction with each other for device to work, removing any one component will make the ART not work as desired.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the nrincinles of the nresent disclosure

[0030] FIG. 1A illustrates an isometric view of internal arrangement in the proposed sound attenuating device for engine, in accordance with embodiments of the present disclosure.
[0031] FIG. IB illustrates front view of cross-sectional representation of the sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0032] FIG. 1C illustrates an exemplary view of internal details of the proposed sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0033] FIG. 2 illustrates a jet means and plurality of obstruction vanes of sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0034] FIG. 3 illustrates conduits and plurality of obstruction vanes of sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0035] FIG. 4 illustrates a resonator assembly of the proposed sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0036] FIG. 5 illustrates an exemplary view of outer housing, inlet pipe, exhaust pipe, and resonator assembly of sound attenuating device for engine, in accordance with an embodiment of the present disclosure.
[0037] FIG. 6 illustrates a schematic sectional view of the sound attenuating device for engine, in accordance with an embodiment of the present disclosure
DETAILED DESCRIPTION
[0038] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such

details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0039] If the specification states a component or feature "may", "can", "could", or "might" be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0040] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the disclosure, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[0041] Various terms as used herein. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0042] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.

[0043] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. "such as") provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0044] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0045] Aspects of the present disclosure relate to a sound attenuating device for engine. More specifically, it pertains to a compact sound attenuating device which works effectively within given space constraint by diminishing varying frequencies of sound produced by an exhaust fluid under different load conditions of an engine.
[0046] In an aspect, the present disclosure elaborates upon a sound attenuating device for engine, the sound attenuating device A sound attenuating device can include a housing can be configured with an inlet pipe adapted to admit an exhaust fluid from the engine. A plurality of obstruction vanes can be arrayed at a predefined distance with each other to make a plurality of partitions in the housing. An at least one conduit can be extending longitudinally across the

plurality of obstruction vanes and the plurality of partitions can be along the housing. A jet means, with predefined diameter and length, configured with the plurality of obstruction vanes. The jet means can be adapted to increase the exhaust fluid flow rate. A resonator assembly, with predefined dimensions, can be configured at right angle with the housing and opening in the plurality of partitions.
[0047] In an aspect, an outlet pipe can be configured with the plurality of partitions such that positioning and arrangement of the plurality of obstruction vanes and the at least one conduit, in combination with the jet means and the resonator assembly can enable sound attenuation of the exhaust fluid flowing from the inlet pipe through the housing to the outlet pipe.
[0048] In an embodiment, the plurality of partitions can include a first partition, a second partition, a third partition, and a fourth partition can be arrayed along the longitudinal axis of the housing, and the first partition can be configured with the inlet pipe, and the fourth partition can be configured with the resonator assembly and the outlet pipe.
[0049] In an embodiment, the first obstruction vanes can be configured with the jet means, and the plurality of obstruction vanes can be configured with plurality of opening, and the first partition, the second partition, the third partition, and the fourth partition can be in fluidic communication with each other.
[0050] In an embodiment, the dimensions of the jet means can be configured to enable noise cancellation by creating a masking noise inside the housing.
[0051] In an embodiment, the inlet pipe can be configured with a plurality of first holes to enable flow of the exhaust fluid in the first partition.
[0052] In an embodiment, the at least one conduit can be configured with a plurality of second holes can be positioned in the first partition and the fourth partition can be configured with plurality of third holes, and the at least one conduit can be in fluidic communication with the first partition, and the fourth partition.

[0053] In an embodiment, a periphery of the at least one conduit can be configured with a fourth hole such that the fourth hole can be positioned in the second partition, and can be proximal to the first obstruction vanes.
[0054] In an embodiment, the resonator assembly can include a receptacle and a neck pipe, such that the neck pipe extends upwards from the receptacle and can be positioned at right angle to the housing in the fourth partition, and predefined dimension and right angle position of the resonator assembly can enable cancellation of target frequencies.
[0055] In an embodiment, the at least one conduit can be configured with a one or more disc members coupled at the ends of the at least one conduit such that the one or more disc members can enable forced entry of the exhaust fluid from the plurality of second holes and forced exit of the exhaust fluid from the plurality of third holes.
[0056] In an embodiment, the device can be adapted to decrease back pressure of the exhaust fluid thereby increasing Power Take Off (PTO) shaft power.
[0057] FIG. 1A illustrates an isometric view of internal arrangement in proposed sound attenuating device 100 for engine, in accordance with embodiments of the present disclosure. FIG. IB illustrates front view of cross-sectional representation of sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure. FIG. IC illustrates an exemplary view of internal details of the proposed sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure. FIG. 2 illustrates a jet means and plurality of obstruction vanes for sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure. FIG. 3 illustrates conduit and plurality of obstruction vanes for sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure.
[0058] In an embodiment, the sound attenuating device 100 can be coupled
with an engine exhaust manifold such that the sound attenuating device 100

attenuates various frequency ranges of an exhaust coming from the engine. The sound attenuating device 100 can include a housing 502 (as shown in FIG. 5), a plurality of obstruction vanes 102-1, 102-2, 102-3 (collectively can be referred to as obstruction vanes 102, herein), an at least one conduit 104-1, 104-2, 104-3, 104-4 (collectively can be referred as conduits 104, herein), a jet means 138, a resonator assembly 108, an outlet pipe 110, and the likes. The housing 502 can be configured with an inlet pipe 106, which can be coupled with the engine exhaust manifold to admit the exhaust fluid in the housing 502. The plurality of obstruction vanes 102 can be arrayed at a predefined distance with each other in the housing 502, and the plurality of obstruction vanes 102 can be adapted to create a plurality of partitions 124, 126, 128, 130 within the housing 502. The conduits 104 can extend through the plurality of obstruction vanes 102 and the plurality of partitions 124, 126, 128, 130 along the longitudinal axis of the housing 502. The jet means 138 can be coupled with the plurality of obstruction vanes 102, and the jet means 138 can be adapted to increase velocity of an exhaust fluid flow. The resonator assembly 108 can be configured with the housing 502 such that the axes of the resonator assembly 108 and the housing 502 are at right angle with each other. The resonator assembly 108 can be configured to open in one of the plurality of partitions 124, 126, 128, 130 and can be positioned in proximity with the outlet pipe 110. The outlet pipe 110 can be fluidically coupled with one of the plurality of partitions 124, 126, 128, 130 to enable the exhaust fluid to flow out.
[0059] In an embodiment, the housing 502 can include a front cover 114, a rear cover 116, and a circumferential wall. The circumferential wall can be coupled with the front cover 114 and a rear cover 116 to form an enclosing space. The housing 502 can be adapted to configure various components of the sound attenuating device 100 such as the plurality of obstruction vanes 102, the conduits 104, the jet means 138, the resonator assembly 108, the outlet pipe 110, inlet pipe 106, and the like. In an exemplary embodiment, the housing 502 can be manufactured from materials such as but not limited to steel, aluminium, titanium, and the like. In another exemplary embodiment, the housing 502 can be selected

from shapes such as but not limited to cylindrical, elliptical, circular, parabolic, and the likes.
[0060] In an embodiment, the plurality of obstruction vanes 102 can include a first obstruction vane 102-1, a second obstruction vane 102-2, and a third obstruction vane 102-3, which can be arrayed laterally in the housing 502. In another embodiment, the first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be positioned perpendicular to longitudinal axis of the housing 502. The first obstruction vanes 102-1 can be positioned laterally at a predefined distance from the front cover 114, thereby forming a first partition 124. The third obstruction vane 102-3 be positioned laterally at a predefined distance from the rear cover 116, thereby forming a fourth partition 130. The second obstruction vane 102-2 can be positioned between the first obstruction vane 102-1 and the third obstruction vane 102-3, and the second obstruction vane 102-2 can be positioned at a predefined distance from the first obstruction vane 102-1 thereby creating the plurality of partitions 126, 128 between the first obstructing vane 102-1 and the third obstructing vane 102-3. In an embodiment, the first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be selected from material including but not limited to steel, polymer, aluminum, and the likes. In an exemplary embodiment, the first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be in-line with each other. In another exemplary embodiment, thickness of the first obstruction vane 102-1, the second obstruction vane 102-2, the third obstruction vane 102-3 can be different from each other.
[0061] The first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be configured with the conduits 104. In an exemplary embodiment, the first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be fixedly coupled with the conduits 104. In specific embodiment, the first obstruction vane 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3

can be welded to the conduits 104 such that the obstruction vanes 102 can support the conduits 104.
[0062] In an embodiment, the first obstruction vane 102-1 can be configured with the jet means 138, such that the jet means 138 can increase velocity of the exhaust fluid flow, and can muffle specific target frequencies of the exhaust fluid sound by causing a masking sound. The jet means 138 opens into the second partition 126 thereby enabling flow of exhaust fluid from the first partition 124 in the second partition 126. The second obstruction vane 102-2 can include a first opening 132 such that the first opening 132 can be fluidically coupled with the partitions 126, 128. In an exemplary embodiment, the first opening 132 can be positioned offset with respect to the axis of the second obstruction vane 102-2. The third obstruction vane 102-3 can include a second opening 134 such that the second opening 134 can be fluidically coupled with the partitions 128, 130. The second opening 134 can be positioned offset with respect to the axis of the third obstruction vane 102-3. Cross-sectional area of the second opening 134 can be greater than the cross-sectional area of the first opening 132. Shapes and sizes of the first opening 132 and the second opening 134 can be different from each other. In an exemplary embodiment, the second obstruction vane 102-2, and the third obstruction vane 102-3 can be made of plates with punched openings. In another exemplary embodiment, the first obstruction vane 102-1 can be configured with an open end pipe, which can be small in length.
[0063] In an embodiment, the plurality of partitions 124, 126, 128, 130 can include a first partition 124, a second partition 126, a third partition 128, and a fourth partition 130, such that the first partition 124 can originate from the front cover 114 till the first obstruction vane 102-1. The first partition 124 can be configured with the inlet pipe 106, such that the first partition 124 can be adapted to expand the exhaust fluid received from the engine exhaust manifold. The second partition 126 can originate from the first obstruction vane 102-1 and can extend till the second obstruction vane 102-2, the third partition 128 can originate from the second obstruction vane 102-2 till the third obstruction vane 102-3, and

the fourth partition 130 can originate from the third obstruction vane 102-3 till the rear cover 116. The first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can be in fluidic communication with each other. The first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can be adapted to admit the exhaust fluid. The first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can attenuate various frequency ranges of the sound waves from the exhaust fluid. In an exemplary embodiment, the first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can suppress the targeted sound frequencies. A length and volume of the first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can be adjusted corresponding to a frequency range of a sound to be attenuated. The plurality of partitions 124, 126, 128, 130 can be tuned to muffle a corresponding frequency. The plurality of partitions 124, 126, 128, 130 can be dimensioned and spaced to accommodate different frequency ranges as desired. In an exemplary embodiment, the length of the first partition 124, the second partition 126, the third partition 128, and the fourth partition 130 can be designed corresponding to a wavelength of the sound to be suppressed.
[0064] In an embodiment, sound waves of the exhaust fluid hit interior walls
of the first partition 124. Over a period of time, energy of the sound waves can be diminished, and corresponding frequency of the sound can be attenuated. In another embodiment, the sound waves can hit inside the first partition 124, the second partition 126, the third partition 128, and the fourth partition 130, such that energy of the sound waves can be diminished over a period of time.
[0065] In an embodiment, the inlet pipe 106 can be coupled with the engine exhaust manifold. In another embodiment, the inlet pipe 106 can be coupled with the engine exhaust manifold with an exhaust flange. One end of the inlet pipe 106 can be coupled with the engine exhaust manifold and other end of the inlet pipe 106 inside the first partition 124 can be closed with the cover member 140, such

that the cover member 140 can prevent escape of exhaust fluid from other end of the inlet pipe 106.
[0066] The inlet pipe 106 can be in fluidic communication with the first partition 124. The end of the inlet pipe 106 inside the first partition 124 can be configured with the cover member 140 and periphery of the inlet pipe 106 inside the first partition 124 can be configured with a plurality of first holes 118, such that the exhaust fluid entering from the inlet pipe 106 can be expanded through the plurality of first holes 118 inside the first partition 124. In another embodiment, the plurality of first holes 118 can be configured 360 degrees around the periphery of the inlet pipe 106 inside the first partition 124. In yet another embodiment, the plurality of first holes 118 can be radially configured around periphery of the inlet pipe 106 inside the first partition 124. The plurality of first holes 118 can be configured over the circumferential surface of the inlet pipe 106 inside the first partition 124. The plurality of first holes 118 can vary in shape and size. The plurality of first holes 118 can face the circumferential wall of the housing 502, and the first obstruction vane 102-1 and front cover 114 to direct the sound wave in a direction that can be conducive to suppress varying sound frequencies generated by the exhaust fluid. In an exemplary embodiment, the inlet pipe 106 can include asymmetric plurality of first holes 118.
[0067] In an embodiment, the conduits 104 can be configured with the first obstruction vanes 102-1, the second obstruction vane 102-2, and the third obstruction vane 102-3. In another embodiment, the conduits 104 can pass through the first obstruction vane 102-1, the second obstruction vane 102-2, the third obstruction vane 102-3, which can provide support and strength to the conduits 104. The conduits 104 can include a first conduit 104-1, a second conduit 104-2, a third conduit 104-3, and a fourth conduit 104-4. The conduits 104 can be positioned longitudinally inside the housing 502 extending from the first partition 124 and passing through the second partition 126 and the third partition 128 till the fourth partition 130. In an embodiment, the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, the fourth conduit 104-4 can be positioned

in the first partition 124, and can be configured with a plurality of second holes 120 such that the conduits 104 can be in fluidic communication with the first partition 124. In an exemplary embodiment, the plurality of second holes 120 can be in fluidic communication with the plurality of first holes 118, and the plurality of second holes 120 can admit the exhaust fluid inside the conduits 104. The plurality of second holes 120 can be configured on periphery of the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, and can be positioned inside the first partition 124. The plurality of second holes 120 can be configured 360 degrees around the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the first partition 124. In another embodiment, the plurality of second holes 120 can be radially positioned around the periphery of the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed inside the first partition 124. In yet another exemplary embodiment, the plurality of second holes 120 can be configured over a circumferential surface of the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the first partition 124. The plurality of second holes 120 can vary in shape and size. In another exemplary embodiment, the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4 can include asymmetric plurality of second holes 120.
[0068] In an embodiment, the first conduit 104-1, the second conduit 104-2,
the third conduit 104-3, and the fourth conduit 104-4 can be positioned in the fourth partition 130, which can be configured with a plurality of third holes 122 such that the conduits 104 can be in fluidic communication with the fourth partition 130. The plurality of third holes 122 can be configured on periphery of the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the fourth partition 130. The plurality of third holes 122 can be configured 360 degrees around the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the fourth partition 130. In another embodiment,

the plurality of third holes 122 can be radially positioned around the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the fourth partition 130. In yet another embodiment, the plurality of third holes 122 can be configured over the circumferential surface of the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4, which can be enclosed in the fourth partition 130. In an exemplary embodiment, the plurality of third holes 122 can vary in shape and size. The plurality of third holes 122 can face the circumferential wall of the housing 502. In another exemplary embodiment, the first conduit 104-1, the second conduit 104-2, the third conduit 104-3, and the fourth conduit 104-4 can include an asymmetric plurality of third holes 122.
[0069] In an embodiment, an attenuation of corresponding frequency range can be achieved by designing the plurality of second holes 120 on the conduits 104, and the plurality of third holes 122 on the conduits 104. The first conduit 104-1, second conduit 104-2, third conduit 104-3, fourth conduit 104-4 can be configured with different cross-sectional areas, and can be configured with the plurality of second holes 120 and plurality of third holes 122, which can attenuate various frequency ranges. In an exemplary embodiment, the conduits 104 of varying cross-sectional areas with the plurality of second holes 120 and the plurality of third holes 122 can effectively attenuate target troublesome frequencies of the exhaust fluid.
[0070] In an embodiment, opposite ends of the conduits 104 can be configured with one or more disc members 136 configured to disable flow of the exhaust fluid from the opposite ends. The rear end and the front end of the conduits 104 can be configured with the one or more disc members 136. In an exemplary embodiment, two disc members 136 can be configured on two opposite ends of each of the conduits 104.
[0071] In an embodiment, each of the conduits 104 can be configured with a pair of fourth holes 112 spaced 180 degrees apart on the periphery and positioned inside the second partition 126 such that the pair of fourth hole 112 can be

proximal to the first obstruction vane 102-1. The pairs of fourth holes 112 on each of the conduits 104, inside the partition 126 and proximal to the first obstruction vane 102-1, can collectively be called as set of fourth holes 112. The set of fourth holes 112 can be adapted to attenuate sound of the exhaust fluid at certain predetermined frequency range.
[0072] In an embodiment, the jet means 138 can be configured with the first obstruction vane 102-1, such that the jet means 138 can enable flow of the exhaust fluid from the first partition 124 to the second partition 126. The jet means 138 can be selected from a group including nozzle, fluid jet, converging apparatus, diverging apparatus, and the likes. In an exemplary embodiment, the jet means 138 can be configured perpendicular to the first obstruction vane 102-1, and can be positioned longitudinally along the housing 502. In an exemplary embodiment, length of the jet means 138 can be selected such that length of the jet means 138 can be less than the second partition 126. In another exemplary embodiment, the cross-sectional areas of opposite ends of the jet means 138 can vary in dimensions. A predetermined quantity of exhaust fluid can pass through the jet means 138 at higher velocity, and the jet means 138 can cause a masking sound to muffle various frequencies of the exhaust fluid. In an exemplary embodiment, the jet means 138 can admit 30% of the exhaust fluid flowing from the first partition 124 to the second partition 126, such that the jet means 138 can cause a regenerated sound to suppress identified troublesome frequencies of the exhaust fluid. The jet means 138 can create a masking sound inside the second partition 126, which can nullify broadband frequencies of the exhaust fluid like an active sound cancellation. Higher velocity of the exhaust fluid passing through the jet means 138 can create higher tonal frequencies, which can muffle various sound frequencies of the exhaust fluid at different speeds and load conditions. In an exemplary embodiment, an agricultural machinery, such as tractor, running at say 2000 RPM with no load, emits the exhaust fluid from the sound attenuating device 100 at say 1000 cubic feet per minute (CFM). Cross-sectional area of the jet means 138 can be designed to mask a sound frequency of say 400 Hz. When the tractor is coupled with an implement, such as say a harrow or a cultivator, then the

tractor running at say 1800 rpm with no load can experience a drop of say 200 RPM, which can reduce the volumetric flow of the exhaust fluid by 20%, that is, say up to 800 CFM. This drops velocity of the exhaust fluid entering the jet means 138, and hence frequency of the exhaust fluid get shifted to say 450 Hz. Thus the tonal frequency of the exhaust fluid after passing through the jet means 138 can be made proportional to the speed of exhaust fluid passing through the jet means 138, which in turn can work in muffling different noise frequencies at different speeds and loads. It is found advantageous to position the jet means 138 proximal to the inlet chamber and hence configured on the first obstruction vane 102-1.
[0073] In an embodiment, the outlet pipe 110 can be fluidically coupled with the fourth partition 130 to enable the exhaust fluid with damped sound to flow out. The outlet pipe 110 can be coupled with the rear cover 116 such that the exhaust fluid with suppressed sound can flow out of the outlet pipe 110. The outlet pipe 110 can be designed such that the outlet pipe 110 can attenuate various frequencies of the exhaust fluid. In order to emit the exhaust fluid out of the sound attenuating device 100, the outlet pipe 110 can be inserted into the rear cover 114 of the housing 502.
[0074] FIG. 4 illustrates a resonator assembly 108 of the proposed sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure.
[0075] In an embodiment, the resonator assembly 108 can be configured with the housing 502. The resonator assembly 108 can include a receptacle 404 and a neck pipe 402 such that the neck pipe 402 extends upwards from the receptacle. The neck pipe 402 of the resonator assembly 108 can be adapted to couple with the housing 502. The neck pipe 402 of the resonator assembly 108 can be positioned such that the longitudinal axis of the neck pipe and the longitudinal axis of the housing 502 are perpendicular to each other. The neck pipe 402 of the resonator assembly 108 can be coupled with the housing and can be configured to open in the fourth partition 130 of the housing 502 proximal to outlet pipe 110 such that the resonator assembly 108 can be coupled at a predetermined position

as desired. The neck pipe 402 and receptacle 404 of the resonator assembly 108 can be coupled with each other such that the longitudinal axis of the receptacle 404 and the longitudinal axis of the neck pipe 402 are non collinear and are spaced apart at lateral distance from each other. The neck pipe 402 can be coupled with the receptacle 404 at upper end surface of the receptacle 404 such that the neck pipe 402 extends upwards from the receptacle. The receptacle 404 can be rolled from a flat sheet of suitable metal, and can be a hollow core such that the sound waves can be adapted inside the hollow core through the neck pipe 402. In an exemplary embodiment, if The sine curve of sound wave entering inside the receptacle 404 can be converted into cosine curve of same amplitude and wavelength. The sound waves hit inner surface of the receptacle 404 such that the sound waves can collide with each other resulting in cancelling incoming frequencies of the sound waves. In an exemplary embodiment, the resonator assembly 108 can be a Helmholtz resonator with the neck pipe 402 positioned at predefined distance from the longitudinal axis of the receptacle 404, which can improve timber quality of the sound attenuating device 100. The resonator assembly 108 can act as an anti-whistle to muffle incoming frequencies of the exhaust fluid coming out of the jet means 138, produced at various load conditions of the engine. In an exemplary embodiment, the resonator assembly 108 can be designed to attenuate a troublesome frequency, say 1125 Hz, by creating a sound wave out of phase almost like a whistle which cancels this incoming frequency. In another exemplary embodiment, the resonator assembly 108 can be adapted to suppress incoming frequencies within a range say, 63 Hz to 170 Hz, of sound wave.
[0076] In an exemplary embodiment, positioning the resonator assembly 108 inside the fourth partition 130 at a proximal distance to the third obstruction vane 102-3 can result in attenuation of relatively higher frequencies, while positioning the resonator assembly 108 inside the fourth partition 130 at a distal distance from the third obstruction vane 102-3 can result in attenuation of relatively lower frequencies.

[0077] FIG. 5 illustrates an exemplary outside external view of the sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure. FIG. 6 illustrates a sectional view of the sound attenuating device 100 for engine, in accordance with an embodiment of the present disclosure.
[0078] In an exemplary embodiment, the inlet pipe 106 can be coupled with the exhaust manifold of the engine, such that the exhaust fluid with high sound can expand inside the first partition 124 through the plurality of first holes 118 of the inlet pipe 106. The sound waves can hit the first partition 124, and a part of sound waves can be diminished in the first partition 124. The conduits 104 in the first partition 124 can include a plurality of second holes 120, and the first obstruction vanes 102-1 can be configured with the jet means 138. The sound waves of the exhaust fluid can exit from the first partition 124 and can enter the second partition 126 through the jet means 138 and through the plurality of second holes 120 in such proportion that three fourth of the total quantity of the exhaust fluid can pass through the jet means 138 and one fourth of the total quantity can pass through the plurality of second holes 120. The jet means 138 can mask a part of sound waves, and a part of sound waves can be dampened by the second partition 126. The second obstruction vane 102-2 can include a first opening 132, such that the exhaust fluid with remaining sound waves can be admitted into the third partition 128. The part of sound wave can be attenuated in the third partition 128. The third obstruction vane 102-3 can include a second opening 134, such that the exhaust fluid with remaining sound waves can be admitted into the fourth partition 130, and the remaining sound waves can enter into the resonator assembly 108 positioned inside the fourth partition 130. The fourth partition 130 and the resonator assembly 108 can dampen a part of the remaining sound waves. The exhaust fluid with remaining frequencies of sound waves from the fourth partition 130 can then be admitted into the outlet pipe 110, such that the outlet pipe 110 can further suppress some of the remaining frequencies of the sound waves, thus enabling the exhaust fluid with comfortable, soothing and sporty sound to pass through the outlet pipe 110. By attenuating the

exhaust fluid sounds by a structural sound attenuating device 100, sound level of the exhaust fluid can be lowered, specifically high frequency sound components which can be major source of noisy and troublesome sounds can be effectively attenuated so as to create comfortable, soothing, and sporty sounds.
[0079] In an exemplary specific embodiment, the results of an exhaust fluid sounds, after passing through the sound attenuating device 100, as experienced by a bystander in db(A) units has been tabulated below. The same have been compared with the results of the exhaust fluid sounds passing through the existing sound attenuating device (prior art). The table-1 represents values at various gears of the agricultural vehicle that represent different speed and load conditions. The values of the attenuated sounds have been recorded at bystander level by positioning the bystander at recommended standard distance from the operator in front side as well as in rear side of the agricultural vehicle.

Table-1: Bystander Level (BSL) Sound in db(A)
Gear Rear Side Front Side

Existing device (Prior art) Sound attenuating device 100 Existing device (Prior art) Sound attenuating device 100
LI 80.2 78.3 80.0 78.9
L2 80.0 78.0 80.1 78.8
L3 80.1 78.1 80.5 78.9
HI 80.6 78.3 80.9 78.8
H2 81.0 78.2 81.3 79.1
H3 81.6 78.3 81.7 78.9

[0080] It can be inferred, from the comparison of values in table-1, that sound attenuating device 100 can dampen the sound by 3 to 4 db(A) as compared to existing sound attenuating device (prior art)at bystander.
[0081] In another exemplary specific embodiment, the results of an exhaust fluid sounds, after passing through the sound attenuating device 100, as experienced at OEL (Operator Ear Level) in db(A) units has been tabulated in table-2 below. The same have been compared with the results of the exhaust fluid sounds passing through the existing sound attenuating device (prior art) at OEL. The table-2 represents comparative values of OEL at HI gear of the agricultural vehicle.

Table-2: Operator Ear Level (OEL) sound in db(A)
Gear Existing device (Prior art) Sound attenuating device

Existing device (Prior art) Sound attenuating device Existing device (Prior art) Sound attenuating device
HI 93.7 90.6 93.5 90.4
[0082] It can be inferred, from the comparison of values in table-2, that sound attenuating device 100 can dampen the sound by 3 to 4 db(A) as compared to existing sound attenuating device (prior art) in HI gear at OEL.

Table-3: PTO power and Exhaust back pressure
Description Existing device (Prior art) Sound attenuating device
High Idle 2860
Rated RPM 2700 RPM

PTO shaft Power (HP) 16.9 17.3
Exhaust back pressure (mm Hg) 64.8 29.3
[0083] In an embodiment, table 3 illustrates comparative study of exhaust back pressure and Power Take Off (PTO) shaft of existing device (prior art) and sound attenuating device. An agricultural vehicle at high idle condition , say 2860, and rated RPM, say 2700 RPM, the sound attenuating device 100 produces low exhaust back pressure of 29.3 mm Hg as compared to existing device (prior art). Due to low exhaust back pressure, the sound attenuating device 100 increases PTO shaft power to 17.3 HP as compared to existing device (prior art).
[0084] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C ....and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc. The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning

and range of equivalents of the disclosed embodiments. 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 embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the appended claims.
[0085] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
ADVANTAGES OF THE INVENTION
[0086] The present disclosure provides an efficient and economical solution for attenuating sound of varying frequencies produced under different load conditions of an engine.
[0087] The present disclosure provides a compact sound attenuating device for engine for attenuating sound of low, medium, and high frequencies.
[0088] The present disclosure provides a sound attenuating device for engine which attenuates sound of an exhaust fluid without using pressure differential thereby keeping pressure drop at minimum in exhaust fluid emitted from an engine.
[0089] The present disclosure provides a sound attenuating device for engine which attenuates sound of an exhaust fluid without decreasing efficiency of an engine and overall efficiency of an agricultural vehicle.

[0090] The present disclosure provides a sound attenuating device for engine
which attenuates sound of an exhaust fluid without increasing volumetric space and length of the device.
[0091] The present disclosure provides a sound attenuating device for engine
which suppresses sound of varying frequencies produced by different load conditions of an engine.
[0092] The present disclosure provides a sound attenuating device for engine which decreases back pressure of the exhaust fluid.
[0093] The present disclosure provides a sound attenuating device for engine
which increases Power Take Off (PTO) shaft power.

We Claim:

1. A sound attenuating device (100) for an engine, the device (100)
comprising:
a housing (502) configured with an inlet pipe (106) adapted to admit an exhaust fluid from the engine;
a plurality of obstruction vanes (102) positioned within the housing (502) to make a plurality of partitions (124, 126, 128, 130);
an at least one conduit (104) extending longitudinally across the plurality of obstruction vanes (102) and the plurality of partitions (124, 126, 128, 130) along the housing (502);
an outlet pipe (110) configured with the plurality of partitions (124, 126, 128, 130);
characterized in that
a jet means (138) configured with the plurality of obstruction vanes (102), wherein the jet means (138) is adapted to increase the exhaust fluid flow rate;
positioning and arrangement of the plurality of obstruction vanes (102) and the at least one conduit (104), in combination with the jet means (138) and the resonator assembly (108) configured at right angle with the housing (502) and opening in the plurality of partitions (124, 126, 128, 130) enables sound attenuation of the exhaust fluid flowing from the inlet pipe (106) through the housing (502) to the outlet pipe (110).
2. A sound attenuating device (100) for an engine as claimed in claim 1,
wherein the plurality of partitions (124, 126, 128, 130) comprises a first
partition (124), a second partition (126), a third partition (128), and a
fourth partition (130) arrayed along the longitudinal axis of the housing
(502), wherein the first partition (124) is configured with the inlet pipe

(106), and the fourth partition (130) is configured with the resonator assembly (108) and the outlet pipe (110).
3. A sound attenuating device (100) as claimed in claim 3, wherein the first obstruction vanes (102-1) is configured with the jet means (138), and the plurality of obstruction vanes (102) are configured with plurality of opening (132, 134), wherein the first partition (124), the second partition (126), the third partition (128), and the fourth partition (130) are in fluidic communication with each other.
4. A sound attenuating device (100) as claimed in claim 1, wherein the jet means (138) configured to enable noise cancellation by creating a masking noise inside the housing (502).
5. A sound attenuating device (100) as claimed in claim 1, wherein the inlet pipe (106) is configured with a plurality of first holes (118) to enable flow of the exhaust fluid in the first partition (124).
6. A sound attenuating device (100) as claimed in claim 1, wherein the at least one conduit (104) is configured with a plurality of second holes (120) positioned in the first partition (124) and the fourth partition (130) is configured with plurality of third holes (122), wherein the at least one conduit (104) is in fluidic communication with the first partition (124), and the fourth partition (130).
7. A sound attenuating device (100) as claimed in claim 1, wherein a periphery of the at least one conduit (104) is configured with a fourth hole (112) such that the fourth hole (112) is positioned in the second partition (126), and is proximal to the first obstruction vanes (102-1).
8. A sound attenuating device (100) as claimed in claim 1, wherein the resonator assembly (108) comprises a receptacle (404) and a neck pipe (402), such that the neck pipe (402) extends upwards from the receptacle and is positioned at right angle to the housing (502) in the fourth partition (130), wherein predefined dimension and right angle position of the resonator assembly (108) enables cancellation of target frequencies.

9. A sound attenuating device (100) as claimed in claim 7, wherein the at least one conduit (104) is configured with a one or more disc members (136) coupled at the ends of the at least one conduit (104) such that the one or more disc members (136) enable forced entry of the exhaust fluid from the plurality of second holes (120) and forced exit of the exhaust fluid from the plurality of third holes (122).
10. A sound attenuating device (100) as claimed in claim 1, wherein the device (100) adapted to decrease back pressure of the exhaust fluid thereby increasing Power Take Off (PTO) shaft power.