Abstract: An exhaust sound attenuation and control system combines the functions of a muffler and resonator in a single, relatively compact device. The internal components of the device may also be coated with one or more emission reduction materials to provide a catalyzing function for the exhaust gases flowing through the system. The present exhaust system provides multiple gas flow paths therethrough, with different paths producing different effects in order to reduce sound output at certain frequencies, as in a resonator, and to attenuate sound throughout a broader frequency range, as in a muffler. The cross-sectional areas of each of the various internal passages and outlet pipe are at least as great, or greater, than the cross-sectional area of the inlet pipe, thereby providing a free flow system with relatively low backpressure.

Abstract: A chromed exhaust pipe and muffler for motorcycles that is capable of withstanding the extreme heat generated at high rpm's of a motorcycle engine without discoloring or “bluing”. A double wall construction is utilized for the exhaust pipe and muffler with the back side of the exterior chromed pipe cut away along the length of the pipe from the mounting flange to the muffler core. The cut-away exterior pipe is dimensional to allow the interior pipe to be inserted in one piece from the mounting flange to the muffler core, as well as cooling the exterior pipe, thereby preventing heat discoloration of the exterior chromed pipe. Spacers are welded to the interior pipe and the exterior pipe at the backside cut-away of the exterior pipe to space the interior pipe within the exterior pipe. The muffler core includes a baffle core enclosed by an interior pipe section, allowing gases to flow out the back end only. The interior pipe is spaced apart from and enclosed in the exterior chromed pipe. The double walled muffler section prevents discoloration and reduces heat transfer to the exterior chromed pipe. For dual pipes, the double wall construction is utilized on each separate pipe. Both pipes then attach to a Y-shaped collector which is part of a muffler core, both being enclosed by an exterior chromed pipe.

Abstract: An exhaust gas muffler for an engine, the exhaust gas muffler having a body, at least one inlet for the exhaust gas from the engine on the body, a baffled chamber in the body to receive exhaust gas from the at least one exhaust gas inlet, at least one exhaust gas outlet from the baffled chamber to vent the exhaust gas from the baffled chamber, at least one fresh-air inlet on the body, a heat exchange conduit extending into the baffled chamber between the fresh air inlet and the at least one exhaust gas outlet, the heat exchange conduit being sized and shaped to permit heat exchange between the fresh air and the exhaust gas in the baffled chamber, and a fresh air outlet on the heat exchange conduit, the fresh air outlet being sized, shaped and located relative to the exhaust gas outlet to permit the fresh air to mix with exhaust gases being vented from the baffled chamber to lower an exit temperature of the exhaust gases.

Abstract: An absorptive and reactive muffler includes an annular flow path for the gas with the center of the annulus having a plurality of resonators which are in open communication with the downstream end of the annular flow path and make up the reactive portion of the muffler. The flow path is at least partially lined by an absorptive material overlain by a perforate material and makes up the absorptive portion of the muffler.

Abstract: Fluid flow through acoustic mufflers is a complex phenomenon that has been investigated for many years due to its importance in compressor efficiency. A one dimensional computational fluid dynamics model based on the finite volume methodology is developed to solve this flow, considering compressibility and thermal effects. Head losses of a suction muffler are evaluated with the model taking into account the pulsating flow condition in a dynamic simulation of the whole compressor. The results are compared with those given by an analytical acoustic model and with experimental data so as to assess the model capability. The acoustic model uses an equation to estimate the friction losses but requires empirical loss coefficients that vary according to the compressor working conditions. On the other hand, the computational fluid dynamics model estimates directly the friction losses from its transport equations and therefore requires no such adjustments. Another benefit provided by the fluid dynamics model is the evaluation of gas temperature throughout the muffler, which is considered to be constant in the acoustic model. NOMENCLATURE As flow cross section area T temperature Al volume lateral area V mean velocity at the flow cross section area h enthalpy ∀ volume m& mass flow rate Q& heat transfer p pressure ρ density m mass τw wall shear stress

Abstract: A catalytic muffler having at least one reactor bed (20, 22) each bed having an array of discreet adjacent flow zones (30, 32, 34, 36). The flow zones are interconnected by a series of passages (50, 52, 54) for unidirectional flow (90) of a gaseous fluid sequentially through each adjacent zone (30, 32, 34, 36) in turn from an inlet side of each reactor bed (42) to an outlet side of the reactor bed (44). An inlet (72) fluidly communications with a first of the flow zones (30). An outlet (74) fluidly communicates with the last of the flow zones (36).

Abstract: An air turbine apparatus for use with a combustion engine either as a muffler or as an air intake device is comprised of a housing defining an expansion chamber and an airfoil positioned within the housing The airfoil includes a central aperture extending longitudinally therethrough that is in fluid communication with both the inlet and the outlet of the housing The airfoil is configured to allow gases flowing through the inlet to flow between the outer edge of the airfoil and the housing and through the aperture of the airfoil In addition, the air traveling through the housing is caused to spin as it travels through the housing This rotational flow increased the rate of flow of gases through the air turbine device A chop core is provided between the airfoil and the outlet of the housing to encourage turbulent flow of gases without restricting flow to produce a muffling effect and thus a dampening of noise from the combustion engine

Abstract: PURPOSE: A structure of an exhaust pipe is provided to control the flux of an exhaust gas corresponding to every driving RPM of an engine by controlling the passing area of the exhaust pipe the exhaust gas is passed through according to the pressure of the exhaust gas and reduce the booming noise and the air current noise generated when the exhaust gas is passing through the exhaust pipe CONSTITUTION: An exhaust pipe(10) is connected to a side of a muffler(20) to guide the exhaust gas to the muffler from a combustion chamber Penetration holes(11) are symmetrically formed at the circumference of the exhaust pipe Storage cases(12) having a storage space(13) are symmetrically formed at the outside of the penetration holes Variable flips(15) are symmetrically formed in each storage cases and elastically supported by springs(17) The opening rate of the variable flip is varied by the flux of the exhaust gas passing through the exhaust pipe

Abstract: A bypass for an exhaust system for a utility vehicle, such as a combine, that, when substantially closed, provides maximum noise attenuation for road transport, i.e., relatively high back pressure, and then, when substantially open, would provide a reduced flow restriction, i.e., relatively low back pressure, for full power, field operation. A bypass flow path in an exhaust pipe is located upstream of a primary muffler. A diaphragm can be provided to manipulate a damper which acts to close the exhaust flow to the primary muffler and open the bypass to an exhaust pipe to effectively bypass the primary muffler.

Abstract: A muffler suspension kit for use in attaching a replacement or original catalytic converter, or exhaust pipe muffler to a vehicle includes a flexible clamping band formed of stainless or regular steel. The clamping band extends around a replacement muffler and clamps an angle-shaped suspension bracket against a muffler. The suspension bracket has a plurality of apertures therein for connection to one or more elongate, longitudinally, adjustable J-hooks. The J-hooks are connected to grommets on the vehicle for attaching the muffler to the vehicle. The selective position of attachment of the J-hooks to the suspension bracket and the longitudinal adjustability of the J-hooks provides a wide range of adjustment when attaching a muffler to a vehicle.

Abstract: An exhaust system for a two-cylinder V-engine, having front and rear cylinders and mounted on a saddle-type all-terrain vehicle, includes a muffler disposed behind the two-cylinder V-engine and provided with two connecting openings, a front-cylinder exhaust pipe having one end connected to the exhaust port of the front cylinder, and a rear-cylinder exhaust pipe having one end connected to the rear cylinder. The front-cylinder exhaust pipe is bent so as to extend rearward along side surfaces of the front and the rear cylinders to the muffler and is detachably connected to the connecting opening. The rear-cylinder exhaust pipe is fitted in the other connecting opening and is welded to the muffler.

Abstract: In a snowmobile, a four-cycle engine is mounted in such a manner that its crankshaft is arranged along the body width direction and the central axis of a cylinder(s) is tilted rearward by angle α with respect to the vertical direction of the body, forming a rear tilted engine. At least part of the engine intake system including an air cleaner box and throttle body, connected to the intake port(s) of the engine is accommodated in the space inside the topmost projected portion of the engine hood. Exhaust is led out to the muffler located in front of the cylinder(s) by the exhaust system connected to the exhaust port(s) at the front of the cylinder head. Further, the intake passage is arranged between the engine body and the steering post.

Abstract: A power generation system has a power source and an aftertreatment system connected to the power source. The aftertreatment system is adapted to treat an exhaust of the power source. The aftertreatment system has a particulate filter that is dimensioned to be interchangeable with a muffler.

Abstract: PROBLEM TO BE SOLVED: To improve engine output and purifying performance of an exhaust purifying device in an exhaust device equipped with the exhaust purifying device midway along an exhaust pipe. SOLUTION: The exhaust device E of an internal combustion engine is provided with the exhaust purifying device 3 having a catalyst 30 installed between a first exhaust pipe 1 and a second exhaust pipe 2, and arranged in an exhaust muffler 4. The exhaust purifying device 3 has an outlet 34 forming an outlet passage 36 through which exhaust gas after purification flows out. The outlet 34 has a tapered pipe 39 forming a convergent part. A leakage hole 7 for flowing out a part of the exhaust gas flowing through the outlet 34 is provided at an upstream side 39c of the tapered pipe 39. COPYRIGHT: (C)2004,JPO

Abstract: The field of the present invention is the acoustic noise control The air flow from a fan produces much noise especially when they are finally coming out of the computer case The noise from computer(5) can be reduced effectively with efficient air cooling by complete enclosure of the computer within the soundproofing cabinet(1) which this invention discloses The said cabinet(1) consists of three main parts (air intake part(2), soundproofing box(3) and muffler part(4)) All of these parts are made of sound-reflecting material such as wood plate and inside of them are lined with sound-absorbing material such as polyurethane foam The air coming from the air outlet hole of soundproofing box passes through the sinusoidal path of muffler part but the noise is reduced by reflection and destructive interference between the sound reflecting walls(403, 404) The distance between the two sound reflecting walls can be adjusted manually to find the optimal distance for the noise reduction At the optimal distance, the noise is reduced most by the maximum reflection and destructive interference The present invention can be applied for the total acoustic noise reduction of any noisy device, for example a computer, which uses the air discharging fan for cooling Moreover the total space of the soundproofing cabinet can be reduced by locating the air intake part and muffler part together on one side of the soundproofing box or by using the front or rear door as the air intake part or the muffler part respectively

Abstract: A process is provided for filling a muffler shell with fibrous material. The process involves providing a muffler shell (12) comprising first and second muffler shell outer parts (14,16) which define an internal cavity (17) when coupled together and an internal structure (18) adapted to extend at least part way through the shell internal cavity and having one or more openings communicating with the shell internal cavity. The process further comprises the steps of: providing a perforated tool (52) having opposing first and second surfaces (52b, 52c); providing a vacuum apparatus (50) which is adapted to receive the perforated tool and apply a partial vacuum to the first surface of the tool; placing a sheet (70) adjacent the second surface of the perforated tool; applying a partial vacuum to the first surface of the tool via the vacuum apparatus so as to draw the sheet against the tool second surface; placing the internal structure adjacent the tool; placing the first muffler shell outer part adjacent the tool such that the tool and the fust part define a temporary inner cavity (170); feeding fibrous material (40) into the temporary inner cavity; deactivating the vacuum apparatus; drawing a partial vacuum through the internal structure so as to draw the fibrous material and the sheet toward the internal structure; separating the first muffler shell outer part, the internal structure, the fibrous material and the sheet from the tool; and coupling the second muffler shell part to the first muffler shell part.

Abstract: A process is provided for filling a muffler shell with fibrous material. It comprises the step of providing a muffler shell (12) comprising one or more muffler shell outer parts (14, 16) which define an internal cavity (17) and an internal structure (18) adapted to extend at least part way through the shell internal cavity and having one or more openings adapted to communicate with the shell internal cavity. The process further comprises the step of providing a bag (40a-40c) filled with fibrous material (60). The bag has a first side (42a) with one or more first perforations (44a) defining a first side total open area (45a) and a second side (42b) with either no perforations or one or more second perforations defining a second side total open area. The first open area is greater than the second open area. The process also comprises the steps of positioning the fibrous material-filled bag adjacent the internal structure such that the first side is nearest to the internal structure, and drawing a partial vacuum through the internal structure, the partial vacuum drawing the fibrous-filled bag inwardly towards the internal structure.

Abstract: In an exhaust housing part of a motor vehicle, particularly for an exhaust muffler or an exhaust gas catalyst of an automobile, with a sheet blank as a semi-finished part which, after a stamping process in a tool, forms an upper half shell or a lower half shell of a half-shell muffler or catalyst; or after a wrapping process in a tool, forms a wrapped exhaust gas funnel or cylinder, or an exhaust gas pipe connection; it is proposed to prefabricate the sheet blank as an integral, profiled sheet metal part of differing thickness, with at least one strip section of smaller thickness, and at least one strip section of greater thickness which locally reinforces the finished exhaust housing part (half shell, funnel, cylinder or pipe connection) at least in one wall region.

Abstract: An exhaust system for an internal combustion engine of an outboard motor is provided. The exhaust system provides dual exhaust passages, simplifying the engine's construction and reducing manufacturing costs, while optimizing engine performance. The exhaust system includes exhaust ports having equal lengths that avoid differential pressure losses across cylinders. The arrangement of the exhaust passages enables a cowling to have a tapered aerodynamic design.

Abstract: The suction muffler of a reciprocating compressor is used for reducing a noise produced by pressure pulsations. According to the shape, the suction muffler is classified into one-chamber type, two-chamber type, Helmholtz-resonator type, pipe-resonator type, and so on. These mufflers are used according to the characteristics of the frequency of compressor noise. In this study, four pole parameters have been used for calculating Transmission Loss of the muffler, and Insertion Loss has been acquired for the optimum design of a muffler by the experiment. NOMENCLATURE p : Acoustic Pressure [Pa] c : Speed of Sound [m/s] v : Mass Velocity [kg/s] TL : Transmission Loss ρ : Density of Refrigerant [kg/m] IL : Insertion Loss INTRODUCTION The pressure pulsation generated at the suction and discharge port of reciprocating compressor is the main cause of a noise and vibration. In addition, it has relation to generation of a flow-induced noise and compressor performance. Therefore, many researches on suction muffler have been carried out in view of noise reduction as well as flow performance. According to the characteristics of the noises, either one-chamber type suction muffler or two-chamber type suction muffler can be used for reducing a noise of a reciprocating compressor. Also, Helmholtz resonator can be inserted to a suction muffler. In this case, noise can be reduced so much in a local frequency band, but the width of the band is too narrow to reduce the noise totally with varying temperature of the refrigerant. On the other hand, it is reported that a suction muffler with a pipe resonator can reduce noises efficiently in a broad frequency band. In this study, Transmission Loss (TL), one of the performance parameters for muffler, is calculated using four pole parameters. Another performance parameter, that is, Insertion Loss (IL) is obtained by experiment and one-chamber type suction muffler is compared with two-chamber type suction muffler and pipe-resonator type suction muffler on the characteristics of the noise reduction. SUCTION MUFFLER MODELING Transmission Loss TL (Transmission Loss), one of the performance parameters for a muffler, can be calculated by transfer matrix. State variables for the transfer matrix are acoustic pressure and mass velocity. It is assumed that plane wave propagates to the exclusion of higher modes or three-dimensional waves. Indeed, the suction muffler of a reciprocating compressor is too small to allow propagation except plane waves at the frequencies of interest. In the end, an overall transfer matrix can be defined, in spite of the existence of three-dimensional waves in the suction muffler. The overall transfer matrix relation can be written as             =      

Abstract: The utility model relates to a refrigerant pipe muffler for automobile air conditioning system, comprising an outer shell with an internal cavity, an air inlet pipe and an air outlet pipe which are respectively fixedly connected with the inlet end and outlet end of the outer shell. A porous barrier is transversally provided in the internal cavity of the outer shell to divide the internal cavity into a first cavity and a second cavity. The edge of the porous barrier is fixed on the internal cavity wall of the outer shell. Duo to additional arrangement of the porous barrier, the refrigerant gas can expand for two times in the first cavity and the second cavity to transform partial acoustic energy into potential energy, simultaneously, the turbulent flow is generated and the acoustic energy which transmissions along the pipe is partly made to be reflected, therefore further decreasing the refrigerant hydrodynamic noise in the refrigerant pipe.

Abstract: The invention concerns an exhaust silencer arrangement with integrated bypass assembly and external actuator to control the position of the bypass assembly and external actuator to control the position of the bypass assembly. For applications where a heightened loudness, or increased horsepower through the decrease of exhaust noise suppression is desired or required, but at temporary instances, the invention allows for real time electronic control over the loudness and horsepower potential of the internal combustion engine to which it is applied. The invention is comprised of the exhaust muffler with integrated bypass and silencer module, external electronic actuator, and the mechanical cable which transmits the mechanical output to the actuator bypass valve of the exhaust muffler assembly. The exhaust muffler is comprised of the housing which contains the bypass tube (10) and valve assembly (8), silencer module (13), and inlet (4) and outlet chambers (5) which intersect the bypass assembly with the silencer module. The actuator is a Direct current unit that converts the 12 volt DC power (20) of the vehicle to a linear displacement for repositioning the bypass valve via the connection of the mechanical cable (17) from the actuator rod (21), pulley, or lever (7) to the bypass valve of the exhaust muffle assembly. The invention configured to directly replace a vehicle’s OEM exhaust muffler.

Abstract: An exhaust system provides the benefits of equal or near equal length exhaust pipes for vehicles (for example with transverse engines) having differing length exhaust pipes connected with a single muffler. In accordance with the invention, the muffler has separate first and second internal inlet pipes which have lengths differing by a predetermined length dimension equal or nearly equal to the difference in exhaust pipe lengths. The inlet pipes are connected so that the total lengths of the pairs of inlet pipes and connected exhaust pipes provide a total length of exhaust flow path which is generally equal for gas flow from both engine banks to the interior of the muffler. An optional feature is dual restricted and valve-controlled outlet flow paths which maintain a minimum back pressure at low flows to aid EGR distribution and allow high flow rates at low back pressure for high performance output of the engine with a performance sound.

Abstract: PROBLEM TO BE SOLVED: To obtain a hermetic rotary compressor which is highly efficient and causes a low noise by reducing a deformation of a cylinder blockage surface which is generated by fixing a discharging muffler SOLUTION: The hermetic rotary compressor is provided, inside the hermetic cylinder 1, with an electrically driven device 2; a rolling piston 9; a cylinder 4 to house the rolling piston 9; an upper and lower bearings 5, 6 which are fixed to the cylinder 4 and which have a flange part composing a compressive chamber 14 by blocking the upper and lower end plane of the cylinder 4, and a cylindrical part supporting a revolving shaft 3 to transmit an output of the electrically driven device 2; and the discharging muffler 10 fixed in the lower bearing 6 which reduces discharging sound of a cooling medium gas while covering the opposite side with empty space against the compressive chamber side surface of the lower bearing 6 The outer periphery of the discharging muffler 10 is formed in the flat step part 10a and the flat step part 10a is pressed and contacted to the flange part 6A outer peripheral lower surface of the lower bearing 6 and the discharging muffler 10 is pressed and contacted through the ring-like elastic member 11 to the cylindrical part 6B lower end surface of the lower bearing 6 COPYRIGHT: (C)2008,JPO&INPIT

Abstract: A muffler exhaust tip for a vehicle having a muffler tailpipe includes a substantially hollow, cylindrical muffler tip member with an inboard end adapted to be affixed to the tailpipe and an outboard end. The hollow, cylindrical member is defined by an elongated outer sleeve and a coaxial, perforated inner sleeve which jointly define a baffle interspace therebetween. The inner sleeve carries a plurality of radially inboard protrusions to alter exhaust flow through the muffler exhaust tip. The perforated inner sleeve of the cylindrical member may define a pattern of holes. The baffle interspace may include a layer of fire retardant sound baffling material. The plurality of inboard protrusions define a helix extending through part of the inner sleeve in one embodiment. In another embodiment, part of the outer sleeve of the muffler tip includes a conical reducer such that the inboard end matches the dimensions of the tailpipe.

Abstract: A muffler arrangement includes an exhaust-gas muffler, which is subdivided into an inlet space and an outlet space. An exhaust-gas stub of an internal combustion engine opens into the inlet space. Exhaust gas is conducted from the outlet space into an air channel via an exhaust-gas outlet. The air channel is formed between the housing of the exhaust-gas muffler and an outer cover and extends along a side of the exhaust-gas muffler. A cooling-air component flow is branched from a cooling-air flow of a cooling-air blower and enters at a first end of the air channel. The cooling-air component flow exits again at the second end of the air channel. In order to reduce the discharge temperature of the exhaust gas (especially with the arrangement of a catalytic converter), it is provided that the exhaust-gas jet is conducted in the air channel in spaced relationship to the air channel walls and is essentially surrounded on its path to the air channel outlet window by the supplied cooling-air component flow so that the exhaust-gas jet forms a core flow and the cooling-air component flow forms a cover flow surrounding the core flow.

Abstract: A light-emitting structure of the automotive exhaust tailpipe includes an outer tubular member which is fitted over the exhaust tailpipe and is provided with an inner tubular member fitted thereinto along with a first retaining member. A second retaining member is fitted over the inner tubular member such that a receiving space is formed between the first retaining member and a second retaining member for receiving a heat-resistant piece. The second retaining member is provided with a plurality of light bulb sockets. The automotive exhaust tailpipe is thus provided with a light-emitting effect to reinforce the warning effect of the tail lights of the motor vehicle.

Abstract: A vertical mount muffler (40) has an external water trap (52) in an exhaust pipe (48) and drains water from a point between the muffler housing upper outlet (46) and the terminal end (50) of the exhaust pipe. The water trap (52) is laterally adjacent to the muffler housing (42) and below the housing upper outlet (46) and traps and drains water entering the exhaust pipe (48) from the terminal end (50).

Abstract: The present invention is an exhaust system having a parallelogram-shaped cross section. The exhaust system includes a header flange for connection to one or more cylinder exhaust ports. The header flange is coupled to one or more conduits. The conduits merge into a collector, which may or may not include a muffler.