Abstract: A muffler includes a pair of internal plates that are formed to define an array of channels and at least one chamber. The internal plates are connected in face-to-face relationship such that the channels define tubes that communicate with the chamber. At least one short section of conventional tube may be disposed between the plates to achieve a selected exhaust gas flow pattern. The connected internal plates is slid longitudinally into a tubular outer shell and end caps are secured to opposed ends to substantially enclose the muffler. The internal plates can be remanufactured prior to insertion into the tubular outer shell, and can be slid into tubular external shells of different lengths for significantly altering the acoustical tuning of the muffler.

Abstract: A muffler for exhaust systems that feed exhaust into both ends of the muffler can. Exhaust gas enters into the muffler can where it enters an exhaust gas conduit that has a center plug installed. Exhaust is fed into both ends of the exhaust gas conduit. The exhaust gas is then forced out through a number of flared holes in the exhaust gas conduit, where it enters the muffler can and exits through an exhaust port. This design creates a longer exhaust flow path, which allows the exhaust gas to cool, extending the life of the muffler. Moreover, since the gasses are unimpeded in their flow through the conduit until they hit the partition plate, the exhaust conduit is less exposed to the full heat of the exhaust gas, unlike the cones, which do not penetrate deeply into the muffler can and bear the brunt of the exhaust gas.

Abstract: An exhaust system in an internal combustion engine includes a flow rate regulating valve which is positioned in an intermediate portion of an exhaust gas flow passage. The flow rate regulating valve has a rotary shaft rotatably supported in a valve housing, and a rotationally biasing spring mounted between the rotary shaft and the valve housing which provides a spring force to rotationally bias the rotary shaft. In the exhaust system, an axially biasing spring is mounted separately from the rotationally biasing spring between the valve housing and the rotary shaft for biasing the rotary shaft in an axial direction. The rotary shaft is provided with an abutment surface which faces in the one axial direction, and the valve housing is provided with a limiting portion which abuts against the abutment surface to limit the axial movement of the rotary shaft.

Abstract: A muffler including fiberglass packing is assembled and suitable for use in a closed refrigeration system by avoiding the generation of fiberglass debris and preventing its entry into the fluid path. A perforate tube is serially overlain by a heat resistant fabric covering, a fiberglass packing and a circumferentially adjustable and collapsible sleeve which are inserted as a subassembly into the shell of a pressure vessel.

Abstract: An exhaust treatment device for a motor vehicle includes upper and lower shells which are welded together to form inlet and outlet sections and a treatment section which may be occupied by a monolithic catalytic converter element. Inlet and outlet stubs which conduct exhaust gas into and out of the exhaust treatment device are joined to the device by means of generally hemispherical sockets formed integrally in the upper and lower shells and mating with hollow spherical sections incorporated in the inlet and outlet stubs.

Abstract: A heat shield device is described, in particular for shielding heat-radiating parts, such as engines, mufflers, catalytic converters and the like, in which at least one heat shield is provided that partially surrounds the heat-radiating part to be shielded, and at least the surface of the heat shield toward the heat radiator is surface improved in such a way that a roughness of steady course is attained, and heat rays striking the surface of the heat shield are reflected at most a single time.

Abstract: A sound attenuating apparatus and method for forming the same including stacking selectively sized sheets of sound attenuating materials and fastening the same to form elongated, perforated sound attenuating flow-through passages which are structurally connected by means of mechanical joinders outside the noise bearing fluid stream to be attenuated.

Abstract: An exhaust silencer for receiving exhaust gasses from an engine includes inner and outer cylindrical walls and top and bottom closure plates. The inner wall and the top and bottom closure plates define a central collection chamber. Baffles extend alternately from the inner cylindrical wall towards the outer cylindrical wall and from the outer cylindrical wall towards the inner cylindrical wall, so as to define an undulating path for exhaust gasses as they pass from the central collection chamber to an outlet. Sound insulating material is attached to each of the upstream surfaces of the baffles, to the outer surface of the central collection chamber, to the inner surface of the outer cylindrical wall, and to the inner surfaces of each of the top and bottom closure plates. The sound insulating material is protected by expanded metal. The baffles are attached at their vertical edges to the expanded metal and not to the actual inner and outer cylindrical walls themselves.

Abstract: The invention comprises an exhaust system for a motorcycle engine which has an outer imperforate casing having a substantially elliptical cross-section and an inner, coaxial, perforate sleeve also of elliptical cross-section which is of lesser dimensions to provide an annulus within the casing which is packed with a gas permeable material, high temperature resistant material such as fiberglass. The muffler has a single piece inlet end cap and a single piece outlet end cap. Each end cap has an elliptical flange over which is received an end of the outer casing of the muffler. The end caps also have integral mounting flanges to receive and support the inner perforate sleeve. Preferably the muffler is provided with a replaceable sound choke which is a small diameter sleeve that can be removably secured in the discharge end of the muffler, thereby permitting the muffler to be switched between restricted off-road use and unrestricted off-road use.

Abstract: A stamp formed muffler includes a first plate, a second plate and at least one sheet. A second plate and the sheet are secured in face-to-face relationship with the first plate and define a plurality of tubes and an internal chamber. External shells are secured around the internal plates to enclose the tubes and the internal chamber. The external shell may be formed to engage the internal chamber such that the internal chamber divides the external shell into upstream and downstream chambers.

Abstract: A muffler having an inner shell of two deep-drawn inner sheet metal plates laid one atop the other and a housing shell of at least two deep-drawn outer sheet metal plates laid one atop the other. The inner shell has an encircling edge while the housing shell has an encircling housing flange with a lock seam connection which seals the housing shell. The edge of the inner shell is designed so that it barely touches the wall of the housing shell and is held in a spring-like fashion only between clamping creases of the housing shell.

Abstract: A silencer for silencing outlet pulses of compressed air, comprises an elongated housing provided with an inlet and an outlet. Fitted in the housing between the inlet and outlet, are at least two sound-absorbent elements each comprising a transverse member which extends from the longitudinal center line of the housing perpendicularly thereto and at least on two sides terminates at a distance from the housing, the transverse member has, at the end of those sides, a plate which is air impermeable and which extends essentially parallel to the longitudinal center line of the housing. The part of the baffle between the two sides extends up to the wall of the housing. The inlet and outlet open into the housing at locations spaced from the area defined between the plates, and the free cross-sectional surface area between the plates and the housing is less than 15% of the total cross-sectional surface area of the housing at the location of the plates.

Abstract: A muffler is formed substantially from stamped components to include an array of flow tubes and a plurality of chambers communicating with selected flow tubes. The chambers are provided with siphon tube mounting grooves that extend between a plurality of the chambers. The grooves are disposed to lie at gravitational low points of the muffler. The muffler further includes a siphon tube closely engaged by the grooves and extending from the gravitational low points of the chambers into a downstream flow tube of the muffler. Pressure differentials in the flowing exhaust gas will cause condensate in the chambers to be sucked through the siphon tube and evacuated from the muffler.

Abstract: A muffler is provided for attenuating noise associated with flowing exhaust gas and for evacuating condensate from gravitational low points of the muffler. The muffler includes top and bottom plates that are formed to define a plurality of flow tubes therebetween. A bottom internal shell is secured to the bottom plate. The bottom plate and the bottom internal shell are formed respectively to define a siphon tube therebetween. The siphon tube includes a siphon inlet at a location that will coincide with a low point on the muffler and a siphon outlet in a selected flow tube. The muffler further includes a bottom external shell secured to the bottom internal plate and surrounding the bottom internal shell. Condensate accumulating of the gravitational low point of the bottom external shell will be drawn through the siphon tube and evacuated from the muffler.

Abstract: A muffler (20) for attenuating fluid pressure pulsations produced by (14) in an automotive air conditioning system (10) includes a housing (22) having opposed to axial ends, an inlet opening (40) and an outlet opening (42) both disposed at the same axial end of the housing. A tube (44) extends through the inlet opening (40) and into the housing, the tube having a first portion (46) and a second portion (48), the second portion having a diameter smaller than a diameter of the first portion. A circumferential bead (50) limits the extension of the tube into the housing to a predetermined distance. A method of manufacturing such a muffler is also disclosed.

Abstract: A muffler for coupling to an exhaust port of an internal combustion engine includes a housing, a first hollow body within the housing, a catalyzer within the first hollow body, and a second hollow body within the housing. The first hollow body has an inner surface defining a first chamber and an inlet adjacent the exhaust port to admit the exhaust gas into the first chamber. The exhaust gas is exothermally treated as it flows through the catalyst in the first chamber in a direction away from the engine and passes through an outlet of the first hollow body to a second chamber. The second chamber is formed by an inner surface of the second hollow body and an outer surface of the first hollow body. The treated exhaust gas flows through the second chamber in a direction toward the engine over the outer surface of the first hollow body where a thermal reaction takes place and/or further emission reduction takes place by a catalytic coating on the outer surface of the first hollow body.

Abstract: A vehicular exhaust system muffler including a mechanical lock joint for joining the end tubes to the flow tubes. One end of each end tube has an outer diameter selected such that the one end may be loosely, telescopically and overlappingly fitted within the adjacent end of the adjacent flow tube. The overlapped ends of the end tubes and the flow tubes are mechanically locked together by a circumferential skewed bead formed in the overlapped ends, where the plane of the skewed bead is at an angle less than ninety degrees with respect to the central longitudinal axis of the overlapped ends. This mechanical locking maintains the relative axial positions of the overlapped ends and resists relative movement between the overlapped ends and between the internal panels and the wrapper due to the application of torsional and axial forces that the tubes experience during the assembly of the muffler.

Abstract: A polymeric muffler including two halves each with baffle walls and gas flow openings integrally molded therein. The gas flow openings do not intersect with the mating edges of the baffle walls. The muffler halves are joined along the mating edges of the baffle walls and the outer walls of the two muffler halves. In a preferred embodiment, the muffler includes a filter detachably mounted on the muffler for converting exhaust gases into less toxic products. The gas flow openings are positioned to force all exhaust gas to pass through the filter.

Abstract: A muffler for a two-cycle internal combustion engine used to power lawn and garden equipment includes two mating shells and two plates, sandwiching a spark arrestor screen, are disposed between the shells to form first and second expansion chambers between each plate and the adjacent shell. The first chamber includes an opening for coupling to the exhaust port of the engine. Within one plate is stamped a first depression, a baffle within that depression, and an elongated depression separate from the first depression. In the other plate is stamped a second depression that is punched with an air passage. When mated, an attenuating tube having an entrance in the second of the two expansion chambers and an exit into the atmosphere is formed. The first and second depressions cooperate to expose a large area of the spark arrestor screen to a flow of exhaust gas from the first chamber, through the baffle and into the second chamber.

Abstract: A muffler for an internal combustion engine or the like including a casing (21) having an inlet opening (28), an outlet opening (29), a first partition (43) secured in the casing (21) to divide incoming exhaust gases, and a second partition (46) secured in the casing (21) downstream of the first partition (43), which second partition (46) has an opening (39) through which the divided exhaust gases are converged and joined together for exiting the casing (21). The improvement in the muffler assembly which produces both sound attenuation and lower operating back pressure is to provide an intermediate partition (51) secured in the casing between the first and second partitions (43,46) which is formed to permit substantially uninterrupted or unimpeded flow of exhaust gases past the intermediate partition, while a forwardly facing concaved surface (52) reflects sound components in a direction away from the opening (39) in the second partition (46).

Abstract: An exhaust muffler of this invention is constituted of a muffler main body having an opening, a muffler cover closing this opening of said muffler main body and being capable of attachment and removal, a partition separating said muffler main body and said muffler cover, and a long exhaust extension pass formed by combination of said partition and said muffler cover and extending by meandering in said muffler cover. On said partition, a communicating hole is provided to communicate between said muffler main body side and said muffler cover side. A catalyst is provided on the surface of said partition facing said muffler main body to purify exhaust gas. Thus, exhaust gas introduced into said muffler main body flows into the space formed by said muffler cover through said communicating hole after purified by said catalyst. This exhaust gas passes meandering through said exhaust extension pass during which exhaust gas is sufficiently cooled down and then discharged into atmosphere.

Abstract: An exhaust muffler includes first and second internal plates formed to define channels and chambers. The plates are secured in face-to-face relationship, such that the channels define tubes. The tubes include an inlet tube, a return tube and an outlet tube each of which extends to or from a reversing chamber. A separate pipe extends through the return tube and into the outlet tube. The pipe and the return tube are dimensioned to permit a flow of exhaust gas therebetween.

Abstract: A vehicular muffler has a body with endcaps mounted on opposed ends thereof. The body has an outer wrap and an inner wrap. The outer wrap is sheet metal having opposed edges overlapping each other to form a closed figure. The opposed overlapping edges are an outer edge and an inner edge. The inner wrap is sheet metal having opposed margins overlapping each other. The opposed margins are an inner margin and an outer margin. The inner margin has a portion adjacent to the inner edge. The outer margin is positioned between the inner margin and the outer wrap to form a gap between the terminus of the outer margin and the terminus of the inner edge.

Abstract: A muffler, especially for an internal combustion engine of a chain saw, comprises a primary and a secondary chamber through which exhaust gases from the engine in turn flow. The primary chamber (10) is formed by an inner, generally spherical receptacle (11) which is surrounded by an outer receptacle (12), and the secondary chamber (13) is formed by the space between the receptacles. The dimensions of the receptacles are such that the volumes of the chambers are generally equal.

Abstract: A sound attenuating muffler useful with an internal combustion engine, preferably for marine applications, contains an insert comprising an arrangement of annular sound reflecting surfaces defining an inner chamber into which engine exhaust gases flow in a first direction and one or more directors to divert the axial flow of gases and sound waves in a second direction past these sound reflecting surfaces. As the sound waves are reflected off of these surfaces back into the muffler interior, attenuation of the sound is achieved. The gases exit the muffler to the atmosphere through an outer chamber surrounding the inner chamber. A method of assembling the component parts of the insert is also described.

Abstract: An exhaust muffler for an internal combustion engine including an outer shell containing two halves made of synthetic resin material, a metallic inner pipe extending through the parting plane between the two halves via a tubular extension extending integrally from the two halves, and an outer sleeve which is fitted onto the tubular extension, preferably by using a bayonet mount structure, for securely joining the two halves at its one end and forming an air-tight seal in cooperation with the part of the inner pipe extending out of the tubular extension at its other end. An arrangement is provided for accommodating a relative displacement between the other end of the outer sleeve and the inner pipe for avoiding the generation of thermal stress due to the difference in the coefficient of thermal expansion between the outer shell and the inner pipe made of different materials.

Abstract: A motor vehicle muffler comprising a housing comprising two half shells, and an exhaust conduit having two ends. The conduit is disposed within the housing and is securely joined to the housing at its two ends. Filler material within the housing surrounds the exhaust conduit, the exhaust conduit being in contact only with the filler material between the two ends of the exhaust conduit. The housing has a length and a width and a depth, its length and width being greater than its depth, and at least one plate extends in the direction of the depth of the housing, between the half shells, and is securely joined to the half shells without touching the exhaust conduit. For this purpose, the plate has notches in which leg portions of the exhaust conduit are disposed in spaced relation to the plate. The half shells of the housing are joined to each other by a folded seam and are joined to the ends of the exhaust conduit by welded joints, and are also joined to the plate by welded joints.

Abstract: A muffler comprising a main body having a downstream end and an upstream end relative to gas flow. There is an inner vessel within the main body to divide the main body into an inner chamber and first and second outer chambers. A resonating chamber within the inner chamber divides the inner chamber into first and second inner chambers. The resonating chamber has a perforate wall on its upstream side. An inlet pipe extends into the upstream end of the main body and terminates in a downstream end communicating with the first outer chamber and the first inner chamber. An outlet pipe extends into the upstream end of the main body and terminates in the second outer chamber and in the second inner chamber. In addition there is an inner pipe communicating the first outer chamber, the first inner chamber and the resonating chamber. The further inner pipe communicates the second outer chamber, the second inner chamber and the resonating chamber.

Abstract: In an automobile, a silencer connected to an exhaust pipe includes a casing made of thermally resistant synthetic resin and provided at an inner surface with a thermally insulating material. The silencer is disposed between a side frame and a side body and covered with an undercover from below the silencer and is disposed between a side frame and a side body of an automatic vehicle in a space behind a rear wheel.

Abstract: The invention is directed to an exhaust gas muffler for an internal combustion engine such as a two-stroke engine for portable handheld tools such as a motor-driven chain saw. The engine includes a cylinder and a piston conjointly defining a combustion chamber wherein combustion gases are generated and discharged as a flow of exhaust gas during operation of the engine. The exhaust gas muffler includes a housing having a shell-like wall defining a chamber for receiving the exhaust gas from the engine. The housing has a primary outlet opening formed in the wall of the housing for passing a primary component flow of the exhaust gas out of the chamber in a first direction. The housing has a secondary outlet opening formed in the wall thereof for passing a secondary component flow of the exhaust gas out of the chamber in a second direction.

Abstract: A compact muffler for an internal combustion engine provides significant sound attenuation and back pressure reduction. The muffler is fabricated in the form of an elongated rectangular box with the exhaust pipe connected to an inlet in the center of one end, and the tail pipe of the vehicle connected to an outlet through the opposite end. Several wedge-shaped or V-shaped exhaust pulse splitting plates are located within the casing to split and recombine the stream of exhaust pulses passing through the casing. The splitting devices are located in the casing in positions which cause the different split streams of the exhaust pulses to be intercepted at different distances to cause the pulses passing through different parts of the casing to be out of phase with one another. The out-of-phase streams of the split exhaust pulses are recombined to flow out of the outlet.

Abstract: A system is provided for orienting two engaged exhaust pipes or conduits and maintaining a proper orientation between those pipes after engagement to provide a proper alignment between the pipes. The system includes a tab formed on one of the pipes and a tab-receiving notch formed on the other of the pipes.

Abstract: An exhaust muffler and heat shield assembly and a method for producing the assembly are provided The muffler includes a pair of stamp formed external shells. At least one external shell is stamped to include a plurality of tabs extending outwardly from the peripheral flange of the external shell. The tabs preferably are disposed at locations that otherwise would have defined wastage to be trimmed from the stamp formed external shell The heat shield is configured to be mounted to the muffler by crimping the tabs. In particular, peripheral regions of the heat shield may be engaged between the peripheral flange of the muffler and the crimped tabs. Alternatively, the heat shield may include slots through which the tabs extend for mechanical engagement with the heat shield.

Abstract: A noise reduction method using a muffler for connection to the air inlet of an air compressor including an imperforate, hollow housing enclosing a chamber, air inlet and outlet openings in the housing, an air inlet tube in the housing connected to the air inlet opening and an air outlet tube in the housing connected to the air outlet opening, both tubes extending over half the length of the chamber, and the openings in the distal ends of the tubes facing in the opposite directions.

Abstract: An exhaust muffler is provided with first and second internal plates formed to define an array of tubes and a reversing chamber. A pair of external shells are engaged to the internal plates and define one or more chambers surrounding the tubes defined by the internal plates. A pipe extends across the reversing chamber defined by the internal plates and to the outlet. A portion of the pipe may be perforated to enable expansion of exhaust gas into a high frequency tuning chamber.

Abstract: An exhaust collector for use with an internal combustion engine of the type having a plurality of generally nested exhaust tubes for individually receiving exhaust gases from separate associated engine exhaust ports. The collector is frustoconically shaped and has an open upstream end sealingly engaged with the downstream ends of the exhaust tubes to receive exhaust gases directly therefrom. The collector is oriented with its generally conical shape convergent in the downstream direction, and includes an internal cone shaped stem piece oriented with its longitudinal axis coaxial of the collector. A base portion of the stem piece is nested between and extends from the downstream ends of the exhaust tubes, and an apex end of the stem piece is generally aligned with the collector downstream end. The collector interior wall defines a smooth cylindrical surface when taken in radial cross section at any position along generally the entire length of the axis of the collector downstream of the tube exit ends.

Abstract: The invention relates to a rigidifying structure used to support half shells of a stamp-formed muffler by connecting at least one of the half shells to an inner plate disposed in the space between the half shells so that shell noise is minimized.

Abstract: A muffler with a catalyst A muffler closure is detachably attached to the muffler body of the muffler. A thermal insulation acoustic material layer and a catalyst layer are mounted to an inner surface of muffler closure through a porous holding plate along exhaust gas passage.

Abstract: A new and improved muffler for use particularly with internal combustion engines which utilizes a tube assembly composed of a plurality of laterally nested tubes in direct supporting lateral engagement with each other providing direct communication therebetween through perforations in the tubes. The tube assembly is supported at opposite ends by frustoconical entrance and exit collars, the larger ends being crimped or otherwise secured thereto providing a sealed connection.

Abstract: A muffler of the type used to attenuate exhaust gas noise in exhaust systems of automobiles, trucks, or the like, particularly characterized by a gas flow conduit which is axially slotted and laterally flattened to form a closure and a pair of openings axially inward of the closure, wherein the end walls of the shell are pressed into engagement with the conduit ends to close the conduit and support the conduit.

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: The subject invention is directed to a muffler formed from a plurality of stamped components. The stamped components include at least a pair of plates formed to define an array of tubes therein. The tubes include a plurality of unidirectional flow tubes each of which carries a portion of the exhaust gas flowing through the muffler. The plurality of unidirectional flow tubes communicate with an in-line expansion chamber defined within the muffler. The in-line expansion chamber enables exhaust gas flowing from the unidirectional flow tubes to expand significantly thereby contributing to noise attenuation. The muffler may further include at least one external shell defining a chamber which communicates with the tubes or the in-line expansion chamber.

Abstract: A sound muffling device for use in lawnmowers includes a hollow body containing an aperture plate, a plurality of serpentine configured pipes, a plurality of fans, a double net having a bundle of wires, and a microporous plate, an adaptor having a sound inlet disposed on the exterior of the front end of the hollow body, and a sound outlet of the exterior of a rear end of the hollow body.

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 reinforced stamped muffler is provided. The muffler includes a pair of internal plates secured in face-to-face relationship and formed to define an array of tubes and chambers therebetween. The chambers are provided with at least one array of reinforcing grooves. Larger chambers defined by the internal plates may include a first array of parallel reinforcing grooves and a second array of parallel reinforcing grooves extending transverse to and intersecting the end-most grooves in the first array. All of the grooves preferably extend into intersection with planar portions of the internal plates. The muffler further includes external shells formed to define larger chambers. The larger chambers of the external shells are formed with a major pattern of reinforcing undulations and a minor pattern of undulations or grooves superimposed thereon. The minor pattern preferably includes a parallel array of grooves with end most grooves in the parallel array being intersected by orthogonally extending grooves.

Abstract: An exhaust silencer has an inner, flexible pipe having a plurality of connected overlapping annular sections, an outer casing and a noise-suppressing material between the pipe and the outer casing. The casing has a first strip wound helically in a first direction of winding with partial overlap in a first overlap region between adjacent portions of the strips. A curable adhesive is arranged between the adjacent portions in the overlap region to provide a substantially leak proof seal.

Abstract: A muffler for reducing noise associated with exhaust systems includes an assembly of exhaust tubes and drop-in baffles fixed inside channels defined in a clamshell-type muffler chamber formed from two stamp-formed mating external shells.

Abstract: A muffler cover formed in such a manner that joint sections having a relatively small width are located between a front portion and a top portion, between the front portion and a left side portion, and between the front portion and a right side portion, and that extension sections having substantially the same width as the joint sections are located on both sides of the top portion, the joint sections and the extension sections being folded at an angle of substantially 45 degrees.

Abstract: A light-weight and tough muffler having a high noise deadening effect characterized in that the outer barrel (I) of the muffler is made of a thermotropic liquid crystal polymer. An example of said polymer is a wholly polyester having monomer units represented by general formula (I): ##STR1## This polymer may contain 10 to 60 wt. % of inorganic additives such as glass fibers or carbon fibers.

Abstract: The invention is directed to a seal arranged between two housing parts of a muffler. The seal is configured essentially as a frame and made of sheet steel and has at least two layers. The first layer is defined by the frame itself and the second layer is defined by lugs which are folded over and are configured so as to be integral with the frame.