Abstract:
A sound damping device comprises a first flow channel device (4) and a second flow channel device (6) separated from one another in the elongation of said first and second flow channel devices (4, 6) by at least one intermediate wall (8; 8a, 8b, 8c, 8d, 8e) as seen in the elongation of said first and second flow channel devices (4, 6), said intermediate wall being at least partly provided with a sound attenuating means (9), wherein said first flow channel device (4) has a first inlet (5a) and a first outlet (5b) for a first flow and said second flow channel device (6) has a second inlet (7a) and a second outlet (7b) for a second flow. According to the invention, at least said second flow channel device (6) is provided with an adjustable pressure influencing means (35) for creating a predetermined dynamic pressure difference over said sound attenuating means (9) with respect to the first flow channel device (4).
Abstract:
A vehicle exhaust system includes an exhaust component having an outer surface and an inner surface that defines an internal exhaust component cavity. At least one hole is formed in the exhaust component to extend through a wall of the exhaust component from the outer surface to the inner surface. A member is formed from a resistive material and is configured to overlap the at least one hole. At least one spacer is configured to space the member away from the inner or outer surface of the exhaust component to create an open cavity between the member and the exhaust component. In one example, an actuator is configured to cover and uncover the member dependent upon an operating characteristic to vary damping.
Abstract:
Open chamber exhaust mufflers and related methods of manufacture and use are disclosed. One embodiment of an exhaust muffler has a chamber body, absorbing material that at least dampens sound, and a retainer that retains the absorbing material against an inside surface of the chamber body and exposes an open interior chamber of the chamber body to the absorbing material. The chamber body has an inlet for receiving exhaust from an engine and an outlet for expelling exhaust gas from the exhaust muffler. The chamber body, the absorbing material, and the retainer define the open interior chamber, and the open interior chamber provides an exhaust gas flow area, for unrestricted flow of exhaust gas from the inlet to the outlet, which is larger than a gas flow area of at least one of the inlet and the outlet. An end cover of the chamber body is removable in some embodiments.
Abstract:
Mufflers having polymeric bodies that are protected from being overheated from the exhaust pipe by having an air gap between the exhaust pipe and the polymeric body are disclosed. Also disclosed is a process for making muffler systems wherein the muffler polymeric bodies have a cross section that is constant over the length of the muffler polymeric body. The muffler systems are inexpensive to make and install.
Abstract:
A muffler is disclosed that includes a housing, an inlet pipe, an outlet pipe, a first partition with first apertures, and a second partition with second apertures. The first partition and housing define a first chamber with which the inlet pipe communicates. The second partition and housing define a second chamber with which the outlet pipe communicates. The second partition is spaced from the first partition to define an intermediate chamber. The muffler also includes a sound absorbing member encapsulated within the intermediate chamber. Exhaust noise entering through the inlet pipe enters the first chamber, moves through the first apertures into the intermediate chamber, moves through the second apertures into the second chamber, and exits through the outlet pipe. Exhaust noise is reduced when passing through the sound absorbing member.
Abstract:
A method for filling a muffler with a fibrous material (44) is disclosed. The muffler includes partitions which form a first chamber (13) and second chamber (15), and a first muffler pipe (28) having an outlet end (35). A filling aperture (23) at one end of the second muffler pipe (18) is positioned in the first muffler chamber. The second muffler pipe has a filling sleeve (32) therein, the filling sleeve having a filling discharge opening (36) that coordinates with the filling aperture of the second muffler pipe. The first muffler chamber is filled with fibrous material by applying a vacuum source (42) to the first muffler pipe, which draws the fibrous material through the filling aperture. The filling aperture of the second muffler pipe is then positioned into the second muffler chamber, and the second muffler chamber is filled in the same manner as the first muffler chamber. The filling sleeve is then removed from the second muffler pipe.
Abstract:
Among others in order to provide efficient and manufacture-friendly configurable silencers, with preferred noise attenuation and pressure-drop characteristics, there is disclosed a silencer with a casing (3) having a longitudinal centre axis and at least one inlet (8) and at least one outlet (9) and at least one internal silencing section (2) extending between the inlet (7) and the outlet (8). The silencing section is along the longitudinal centre axis geometrically delimited by an inlet face (12) and an outlet face (13) and, in a direction transverse to, preferably perpendicular to a longitudinal centre axis, comprising a core region. The silencing section further comprising at least three oblong slots (18) extending outwards from the core region towards the casing (3) and extending from the inlet face (12) to the outlet face (13). The side walls of the slots (18) being essentially plane along an outwards extension.