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US 4,109,753 AGranted
Muffler assembly
AssigneeMidas International Corporation
InventorSteven P. Lyman
Life of this patent
Estimating the term…
Abstract
A muffler assembly for substantially dampening acoustical vibrations of engine exhaust gases. The muffler assembly includes flow control means, such as a diffuser having a centrally disposed baffle with radially extending deflector vanes having axially extending tabs. The diffuser can be positioned in a tubular expansion joint which is secured to an apertured louver tube within a loosely compact shell of sound attenuating material. The diffuser substantially blocks and restricts the axial flow of exhaust gases along portions of the longitudinal axis of the louver tube, deflects the flow of exhaust gases toward the sound attenuating material and creates turbulent flow.
Claims22
A muffler assembly for substantially limiting the acoustical level of engine exhaust gases, comprising:
- a muffler having an elongated tubular housing, an elongated foraminous louver tube disposed within and circumscribed by said tubular housing, said louver tube cooperating with and spaced from said housing to define a tubular chamber therebetween, sound attenuating means disposed in said chamber to define a primary sound attenuating zone for substantially limiting the noise level of engine exhaust gases in response to the axial velocity of said exhaust gases, and said louver tube having an inlet and an outlet and defining a longitudinal axis and a plurality of apertures communicating with sound attenuating means;
- a diffuser positioned in communication with said louver tube for reducing the axial velocity of said exhaust gases passing through said muffler and for substantially creating a generally turbulent flow pattern in said muffler, said diffuser being of fluid impervious material and having a centrally-disposed imperforate baffle positioned about said longitudinal axis for substantially blocking and restricting the axial flow of said exhaust gases along portions of said longitudinal axis and including a plurality of deflector vanes extending generally radially outward from said centrally-disposed baffle and spaced from each other to define a plurality of generally radially extending apertures communicating with said louver tube, said vanes deflecting the flow of exhaust gases through said apertures and each vane having a gas contact surface facing generally toward said sound attenuating means for directing the flow of gases passing through said apertures into said sound attenuating means.
A muffler assembly for use in an exhaust system of an engine, comprising:
- a muffler defining a fluid-flow passageway for passage of engine exhaust gases and sound attenuating means communicating with said fluid-flow passageway for substantially limiting the noise level of said exhaust gases;
- and
- flow control means including a centrally disposed imperforate baffle operatively associated with and positioned in said fluid-flow passageway, and a plurality of radially disposed deflector vanes extending generally radially outward from said centrally disposed baffle for directing the flow of exhaust gases toward said sound attenuating means.
A muffler assembly for substantially limiting the acoustical level of engine exhaust gases, comprising:
- a muffler having sound attenuating means for substantially limiting the noise level of engine exhaust gases in response to the axial velocity of said exhaust gases including a tubular shell of sound attenuating material having an annular cross-sectional configuration, an elongated foraminous louver tube wrapped within and circumscribed by said sound attenuating means and in general concentric relationship with said tubular shell, said louver tube having an inlet and an outlet and defining a longitudinal axis and plurality of apertures communicating with said sound attenuating means, and an elongated tubular housing substantially circumscribing, covering and confronting said sound attenuating material;
- an expansion joint comprising an elongated tubular sleeve generally in axial alignment with said muffler and having an internal annular wall defining an outlet throat telescopically coupled to and in communication with the inlet of said louver tube and an inlet throat for receiving said engine exhaust gases;
- and
- a diffuser positioned in the outlet throat of said expansion joint for reducing the axial velocity of said exhaust gases passing through said louver tube and for substantially creating a turbulent flow pattern in said muffler, said diffuser being of fluid impervious material and having a generally flat centrally-disposed shield-like imperforate baffle positioned generally transverse to said longitudinal axis for substantially blocking and restricting the axial flow of said exhaust gases along said longitudinal axis adjacent said outlet throat and including a plurality of radially disposed deflector vanes comprising twelve stationary and imperforate arcuate blades circumferentially spaced from each other to define a plurality of radial apertures communicating with said louver tube, said blades extending radially outward from and twisted relative to said generally flat centrally-disposed baffle for radially deflecting the flow of exhaust gases through said radial apertures and toward said sound attenuating means and said diffuser including a plurality of tangential tabs extending axially from said blades and secured to the annular wall of said expansion joint.
1 more element
Dependencies are inferred from the claim text.