Abstract: A compact muffler has a straight through inner cylindrical casing surrounded by an outer cylindrical casing defining a closed ended sound attenuating chamber therebetween. Within the outer chamber a plurality of axially extending, radially overlying, cylindrical intermediate casings form a plurality of annular sound attenuating passages. The sound passages are configured to have entrances in fluid communication either with an especially configured slot in the inner casing or between certain passages to define a plurality of discrete sound paths, with each sound path having a set length sufficient to generate a reflection wave for attenuating a sound wave having a frequency correlated to the distance of the sound path.

Abstract: A double throat tuner including a second conduit concentric to a first conduit which connects the gas flow to a first volume tuning chamber having a first effective volume. The radial difference between the first and second conduits and the length of overlap of the first and second conduits in combination with the effective volume of the first tuning chamber attenuates a preselective frequency of sound. This attenuation is for a specific frequency range in addition to the overall attenuation of the complete system including a plurality of conduits serially connected by a respective chamber.

Abstract: A silencer is comprised of an outer sleeve, an inner sleeve having a number of pores, and sound absorbing material including heat-resistant fibers packed between the outer sleeve and the inner sleeve. The sound absorbing material is wound directly around the outside of inner sleeve with two or more turns so that the thickness of wound sound absorbing material around the inner sleeve is greater than dimension of a gap between the inner sleeve and the outer sleeve to give interference between sound absorbing material and the inner and outer sleeves. The sound absorbing material with the inner sleeve is press-fitted into the outer sleeve. According to the present invention, sound absorbing material is prevented from being blown out by exhaust gas flowing through the inside of the inner sleeve so that the silencer is improved in durability.

Abstract: A muffler including an offshoot path, one end of which is connected to a middle of a ventilation path so as to diverge from the ventilation path, and another end of which is closed. One portion of the offshoot path and another portion thereof are communicated through a communicating portion. Accordingly, sound waves entering the offshoot path are propagated in a direction of a closed portion, and are also propagated via the communicating portion from the one portion to the other portion.

Abstract: A muffler for an air powered turbine drive includes a cone section made of perforated metal, a plurality of layers of sintered material on the inner surfaces of the cone section, an inner housing section substantially surrounding the cone section, an inner baffle wall between the inner housing section and the inner cone section, and an outer housing section substantially surrounding the inner housing section. Air entering the muffler through the cone section passes outwardly through the walls of the cone section and is then redirected several times before passing outwardly from the outer housing section in order to attenuate the noise in the air leaving the muffler without creating excessive muffler pressure.

Abstract: An adjustable sound attenuating device comprised of an elongated outer main shell of a predetermined diameter, with an inlet coupling and an outlet coupling. The device has located within the shell singular or multiple independent baffle components comprised of a solid baffle plate, a perforated baffle plate, an optional perforated baffle plug, and several chambers provided by the baffle components. The solid and perforated baffle plates have a funnel shape to provide for smooth directional flow of exhaust gases. The perforated baffle plate is pierced with a plurality of openings to allow for the flow of the exhaust gases through the chambers. The perforated baffle tube is pierced with inwardly angled louvers spaced equally around the circumference and staggered to follow a spiral path lengthwise around the perimeter of the tube for routing gases through the chambers.

Abstract: A muffler assembly of an internal combustion engine comprises an inner casing in which is defined a first expansion chamber into which is inserted one end of the exhaust pipe having another end connected to an exhaust gas port of the engine, an outer casing disposed outside the inner casing so as to define second and third expansion chambers between the inner and outer casings, a first baffle pipe disposed so as to mutually communicate the first and second expansion chambers, a second baffle pipe disposed so as to mutually communicate the second and third expansion chambers, and a tail pipe member disposed so as to communicate the third expansion chamber and the outside of the outer casing. The inner and outer casings are formed by two plate members, respectively, which are secured together when the muffler assembly is assembled. A sound absorption chamber is formed around the outer periphery of the tail pipe.

Abstract: An exhaust gas muffler comprises a double-walled casing having an inlet end receiving a stream of the exhaust gas and an outlet end for the exhaust gas, the outlet end comprising an outer tube surrounding a perforated inner tube spaced therefrom, and the tubes defining therebetween a perforation resonator chamber succeeded by a whistling sound resonator. The casing includes an outer wall and a corrugated inner wall defining a gap with the outer wall. A heat-resistant and sound-damping intermediate layer is arranged in the gap between the inner and outer walls and braces the inner wall against the outer wall. Transverse partitions divide the casing into a plurality of chambers between the inlet and outlet ends, and tubes connect the chambers and reverse the exhaust gas stream at least twice between the inlet and outlet ends.

Abstract: A Helmholtz resonator is disposed interiorly of a gas-carrying conduit to attenuate noise passing through the conduit. The Helmholtz resonator encloses a volume that is communicated to the gas flow by a through hole in the wall of the enclosure. The conduit comprises two parts that telescopically snap together to capture the Helmholtz resonator.

Abstract: An apparatus is set forth to limit differential pressure during opening of the water faucet, wherein the apparatus includes a housing with a series of spaced parallel diffuser plates mounting a diffuser medium therebetween, wherein the diffuser plates direct fluid flow coaxially of the plates to a surrounding cylindrical channel, and wherein the channel is directed forwardly of a forward solid end plate and through a directional cylinder into an associated water faucet.

Abstract: An engine exhaust including a silencer which has a cylindrical shell, a front and a rear end plate which are provided to close both ends of the cylindrical shell, and at least three partition walls to divide an inside space of the silencer into a plurality of chambers, i.e. at least a first chamber, a second chamber, a third chamber and a fourth chamber. An inlet pipe which bypasses at least the first and the second chambers, and connects the front end and the third chamber. The inlet pipe has a plurality of small holes which face toward the first and the second chambers. The small holes facing the second chamber are surrounded by a sound absorber. An outlet pipe bypasses at least the second, the third and the fourth chambers and connects the first chamber and the rear end plate. The outlet pipe has a plurality of small holes which face toward the third and the fourth chambers. The small holes facing the fourth chamber are surrounded by a sound absorber.

Abstract: An automotive exhaust gas muffler comprises gas passage tubes supported in curved portions of two press-formed metal housing parts and communicate with recesses formed in the housing parts.

Abstract: A regenerable desiccant cartridge for an automotive muffler including a tubular wire mesh sleeve containing adsorbent and having opposite end portions, an elongated metal base plate extending the entire distance of the sleeve and having end portions crimped over the open ends of the sleeve, the base plate also including rounded corners.

Abstract: A muffler is provided comprising an array of tubes and a stamp formed external shell surrounding the tubes. The external shell is stamp formed to define at least one chamber surrounding at least portions of the tubes. The chamber extends away from peripheral portions of the external shell to define a three-dimensional volume. The chamber is characterized by a plurality of inwardly directed V-shaped grooves, with each groove extending continuously between opposed spaced apart locations on the periphery of each chamber. The grooves preferably define a parallel array of substantially identical grooves. The grooves strengthen the walls of the chamber and efficiently prevent shell noise.

Abstract: A muffler includes a first expansion chamber, a second expansion chamber, a resonator chamber and an inlet pipe having a first open end and a second open end. The first open end of the inlet pipe is inserted into the first expansion chamber so as to communicate with the first expansion chamber. A resonator pipe runs substantially in coaxial relationship with the inlet pipe so as to establish communication between the first expansion chamber and the resonant chamber. A return pipe is disposed between the resonator chamber and the second expansion chamber and passes through the first expansion chamber for establishing communication between the first expansion chamber and the second expansion chamber. An outlet pipe communicates with the second expansion chamber. Said return pipe is inserted with the open end into said resonator chamber, while the inserted open end of the return pipe is furnished with a plug. A portion of the return pipe passes through the first expansion chamber.

Abstract: A sound attenuating muffler for motor vehicle exhaust systems contains a fibrous glass cartridge with a binder-hardened outer shell surrounding a soft fibrous core through which a gas flow tube extends.

Abstract: A straight through type muffler for generating an exhaust flow from an internal combustion engine includes a closed expansion chamber in communication with the straight through passage of the muffler. A minority of the gases passing through the straight through passage will be accumulated in the expansion chamber and will be returned to the straight through passage when the pressure of the gases passing through the straight through passage is reduced, thereby minimizing the back pressure from the muffler.

Abstract: A stamp formed muffler comprising a pair of internal plates and a pair of external shells is provided. The internal plates are stamp formed to define first and second spaced apart arrays of tubes and a single intermediate tube therebetween. Tubes in one array may have perforations or apertures to permit expansion of exhaust gases, while the other array may define at least one tuning tube. The tubes are disposed on the internal plates such that at at least one location thereon a straight line extending entirely across said internal plates will intersect only the one intermediate tube. The external shells are stamp formed to define a plurality of chambers which cooperate with the tubes in the internal plates. The chambers are separated from one another by a crease disposed to align with the intermediate tube. The crease is characterized by a single outwardly convex portion to engage the single bulb. As a result, the crease is not provided with recesses that conceivably could retain corrosive materials.

Abstract: An exhaust system is provided for internal combustion engines which relatively improves the performance of such engines. The system comprises a plurality of approximately equal length exhaust pipes which are operably flow connected to exhaust ports of the engine at one end thereof and to a collection chamber at an opposite end thereof. The system further includes discharge pipes which communicate between ambient atmosphere and the collection chamber. The exhaust pipes are grouped in sets such that each of the pipes in the set is generally axially aligned with one of the discharge pipes. The collection chamber has a cross-sectional area which is greater than the cross-sectional area of the exhaust pipes where they are attached thereto and converges to a smaller cross section at the opposite end thereof where the discharge pipes are attached thereto. The discharge pipes diverge away from the collection chamber and include a silencing device in the discharge ends thereof.

Abstract: An automotive muffler has sound attenuating means in the form of one or more frame subassemblies which are formed of two identical transverse partitions and two identical longitudinal partitions secured at opposite ends to the transverse partitions and acting with them and the muffler housing to provide a retroverted exhaust gas flow path.

Abstract: A muffler is provided with a pair of internal plates stamp formed to define an array of tubes therebetween. An external shell, which may be stamp formed, surrounds and encloses at least selected portions of the internal plates. The array of tubes stamp formed in the internal plates includes at least two tuning tubes. One tuning tube terminates at a tuning aperture in one of the two internal plates, while the other tuning tube terminates at an aperture stamp formed in the other of the two internal plates. Thus, one tuning tube will communicate with a low frequency resonating chamber on one side of the pair of internal plates, while the other tuning tube will communicate with a low frequency resonating chamber on the opposite side of the assembled internal plates.

Abstract: An exhaust muffler is provided. The muffler may be formed from a pair of internal plates that are secured in registration with one another and are formed to define an array of tubes through which the exhaust gages may travel. Selected portions of the tubes in the internal plates may be formed to include perforations. The muffler may further include at least one external shell formed to define at least one chamber which may at least partly surround the perforations in the internal plates. At least one inlet or outlet may lie on the seam between the formed plate members. However, at least one inlet or outlet may also be provided through a portion of the muffler spaced from the seams. The inlet and/or the outlet may be angularly aligned to the longitudinal axis of the muffler and may further be angularly aligned to one another.

Abstract: A muffler is provided including a pair of internal plates formed to define an array of tubes. At least one external shell is formed to define at least one chamber which will surround and enclose a selected portion of the array of tubes. Selected portions of certain tubes will be formed to include perforations. Portions of certain tubes will further undergo cross-sectional changes to control the flow of exhaust gases through the muffler. Certain channels between adjacent chambers of the external shell will be disposed to extend substantially continuously from peripheral portions of the adjacent chambers formed in the external shell. In certain embodiments, a controlled communication is provided between a low frequency resonating chamber and an adjacent expansion chamber. In other embodiments, additional formed layers are provided to enhance either heat or noise insulation.

Abstract: An automotive muffler has an end header with two bushing receiving openings and is used with a gas flow bushing assembly comprising a bushing to fit in one of the openings and a flange to clamp the bushing to the header and cover the other opening in the header.

Abstract: A retroverted flow type exhaust gas muffler has curved flow directing and guiding plates mounted on end headers to facilitate flow reversal.

Abstract: A high performance vehicular muffler is provided. The muffler includes a centrally disposed outlet tube, an inlet tube and a transfer tube. Internal baffles define a low frequency tuning chamber with which the inlet tube and transfer tube communicate. A high frequency tuning chamber surrounds the portion of the outlet tube between the internal baffles. The high frequency tuning chamber is packed with an absorbant. The opposed end caps of the muffler are provided with outwardly bowed portions to achieve a more laminar flow of exhaust gases and to minimize back pressure.

Abstract: An exhaust passage has an upstream end connected to an engine combustion chamber and a downstream end open to the atmosphere. A device substantially equalizes natural frequencies of the exhaust passage respectively corresponding to third-degree and fourth-degree modes of standing pressure waves developing in the exhaust passage. A pressure damper is connected to a point of the exhaust passage at which an antinode of the third-degree or fourth-degree mode lies.

Abstract: A muffler for use on an internal combustion engine includes an enclosure generally cylindrical and having end plates for closing the internal volume of the enclosure, at least one partition plate for dividing the internal volume of the enclosure into at least two chambers, an inlet tube, supported by one of said end plates and at least one partition plate, for conducting combustion gases supplied from the engine to one of the chambers; an outlet tube, supported by the other of the end plates and at least one partition plate, for blowing out the gases from remaining one of the chambers; and a connecting tube supported by said at least one partition plate for interconnecting the volume of adjacent ones of the chambers. At least two of the inlet, outlet and connecting tubes are integrally made of a single sheet of metal shaped to form a combination tube including the at least two tubes. A method of manufacturing such a combination tube is also provided.

Abstract: The muffler comprises a resonator (6) which communicates by way of an outlet orifice (14) with a chamber (5). A flexible valve member (16) regulates the section of the passage through this orifice in accordance with the rate of flow of the gas through the outlet of the resonator under the action, for example, of the pressure prevailing in the resonator. When the running speed of the engine decreases, the valve member reduces the section of the passage through the orifice (16) and modifies the acoustic attenuation in the resonator. The valve member may be controlled by other parameters of the flow of the exhaust gas inside the muffler.

Abstract: The exhaust silencer of the invention improves the various attenuation characteristics without increasing the overall size of the silencer. This is achieved by disposing the pressure take-off of the low-frequency resonator in an end wall of the case of the silencer and by placing the neck of this resonator partly outside the case. The associated chamber is located inside the reflection and interference attenuation stage.

Abstract: A muffler comprising a housing (12) having end caps (16, 18) and partitions (32, 38, 42) which divide it into first and second expansion chambers (40, 44), a flow chamber (36), and a resonator chamber (34). An inlet tube (20) passes through end cap (16) and partitions (38) and (32) to open into chamber (34): it has perforations (58) and (62) which afford communication with chambers (40) and (36) respectively. An outlet tube (24) passes through end cap (18) and partitions (42) and (32) to open into chamber (36): it has perforations (70) which afford communication with chamber (44), and includes anti-whistle beads (72). A conversion-divergent nozzle (80) is located in tube (22) at its end opening into chamber (36). Apertures (190) are provided to afford limited flow of gas through chamber (34) from tube (20) to chamber (36).

Abstract: An automotive type internal combustion engine exhaust muffler has a welded butt joint consisting of the ends of a pipe bushing, a lockseam louver tube, and a partition neck into which the tube is pressed, the welded joint preferably being of a structure produced by the magnet arc process.

Abstract: A muffler for combustion engines in which a housing is subdivided by means of bottoms into at least two successively arranged reflection chambers. Into the first inlet-side reflection chamber an exhaust entry pipe extends. An intermediate channel extends through at least one of inner bottoms from the first into at least one reflection chamber. An exhaust outlet pipe extends from the last reflection chamber out of the muffler, and has at least, in the region of the last reflection chamber, at least one inlet opening. The intermediate channel is arranged in the form of a plurality of intermediate channels which are flowed-through in one and the same direction, and each channel has a small cross-sectional area in relation to the cross-section of the exhaust inlet pipe.

Abstract: A muffler for reducing the audible noise level of exhaust gases emitted by combustion engines has an inlet tube with a patch of louvers or perforations and is arranged so that all or substantially all the gas flowing through the muffler is forced through the patch into an expansion chamber from which it flows by either cross bleeding through a patch of louvers or perforations into an outlet tube or to a chamber opening into the inlet end of the outlet tube. A "splitter" partition may be used to control flow through the louvers and provide additional attenuation. An imperforate portion of the inlet tube is used as a driven tuning tube with a resonator chamber to form a Helmholtz low frequency attenuation system, the performance of which may be improved in some cases by use of an orifice in a wall of the resonator. Also disclosed is a muffler in which all the gas flows through a louver patch in the outlet tube and an imperforate part of the outlet tube is used as a part of an aspirating type Helmholtz system.

Abstract: A sound-attenuating muffler for reducing the acoustic energy in an exhaust gas stream has an elongated cylindrical housing with a small ratio of diameter to length. Axially extending vanes are radially disposed to define an added number of flow passages. Exhaust gas enters an entry passage defined between two vanes, travels past a side-branch resonator and terminates in the entry nozzle of a Helmholtz chamber. The flow turns through a port in one of the vanes and enters a reverse-flow passage, also defined between two vanes, flows past a side-branch resonator and is reversed again through a port through another vane. A third side-branch resonator is provided in the exit region. The muffler may comprise two or more separate similar muffler sections defining such serpentine gas flow paths, and the exit region of an upstream section may then be continuous with the entry region of a downstream section.

Abstract: A muffler for an internal combustion engine includes a cylindrical casing having end plates closing the interior thereof. At least one baffle extending perpendicularly to the central axis of the casing is provided for dividing the interior of the casing into a front chamber and a tuning chamber. A tuning tube extending through the baffle places the front chamber into flow communication with the tuning chamber, and at least one exhaust gas inlet pipe extends into the front chamber through one of the end plates in coaxial relationship with the tuning tube. At least one exhaust gas outlet pipe is provided through the one end plate in parallel relationship with the inlet pipe. Furthermore, one or more openings are provided in the baffle in coaxial relation to the exhaust gas outlet pipe.

Abstract: For dampening exhaust gas noise a muffler contains two portions, of which one is adapted to take care of high frequency noise and includes dampening material, and the other is adapted to take care of low frequency noise and is devoid of such material. The latter portion includes an inner, perforated tube, a surrounding casing and wall means for subdividing the casing axially as well as transversely. The length of the tube is compatible with the lowest frequency of the noise to be divided, and the location of the wall means is selected as to form chambers of varying lengths compatible with other frequencies within the low frequency zone.The high frequency portion may be fitted concentrically around the low frequency portion, or may be located so as to form an axial extention thereby.The means communicating the low and the high frequency portions may include a radial diffusor.

Abstract: A dissipative-type muffler for attenuating the high velocity discharge of a high pressure-high temperature safety valve. A path of flow constituting four stages of controlled turbulence suppressed diffusion is formed internally of the muffler extending from an intake into a plenum chamber then distributed past a plurality of parallel arranged radial diffuser flanges and an acoustical liner before exiting to atmosphere at relatively low velocity and low noise level. Laminar flow to small scale turbulence is obtained in the first stage by a jet impingement directional reversal in a controlled spacing discharge from an intake pipe within the plenum chamber. In the second stage, small scale discharge turbulence of high frequency is achieved by laminar flow induced via radial diffusion through controlled gap spacings between the diffuser flanges.

Abstract: High temperature resisting cordage is wrapped around an exhaust gas muffler housing and covered with an outer wrap of metal to provide sound and thermal insulation for the muffler.

Abstract: A muffler which does not require a low-frequency Helmholtz resonator includes an outer shell and first and second heads for closing the inlet and outlet ends, respectively, of the shell. First, second and third baffles are disposed internally of the shell and extend transversely therein. An outlet end chamber is defined between the inlet head and first baffle. A second chamber is defined between the first and second baffles. A third chamber is defined between the second and third baffles. An inlet end chamber is defined between the third baffle and outlet head. An inlet conducting tube extends longitudinally of the shell through the inlet head and the first, second and third baffles and opens into the inlet end chamber. An outlet conducting tube extends through the outlet head and the first, second and third baffles and opens into the outlet end chamber. An aperture in the first baffle acoustically couples the outlet end chamber and second chamber.