Muffler with insulated internal sound dispersing and absorbing chambers

Claim 2

In a muffler having a housing with an inlet and an outlet, a first chamber in said housing having perforations in the walls thereof, a conduit in said housing connecting said inlet with said chamber and having perforations in the wall thereof, baffle means in said conduit for diverting exhaust gases out through the perforations in said conduit, another chamber in said housing having perforations in the walls thereof and being operatively connected with the outlet in said housing, another conduit in said housing operatively connecting said another chamber with said first chamber, baffle means in said another conduit for diverting exhaust gases out through the perforations in said conduit, and insulating material surrounding said chambers and conduits within said housing, whereby said exhaust gases pass from chamber-to-chamber as the undesirable characteristics are substantially dispersed and dissipated into said insulating material prior to discharge from said muffler.

Claim 3

In a muffler as claimed in claim 1 wherein three chambers are mounted in said housing and are interconnected by two conduits.

Claim 4

In a muffler as claimed iN claim 1 wherein said baffles in said conduits are spiral-shaped baffles for diverting said gases into a spiral-shaped path.

Claim 5

In a muffler as claimed in claim 1 wherein said conduits extend into and are supported in their associated chambers, and wherein the walls of said conduits are perforated both inside and outside said associated chambers.

Claim 6

In a muffler as claimed in claim 4 wherein the remote ends of said conduits in said chambers are closed so as to force all gases to be diverted through the perforations in the walls of said conduits.

Claim 7

In a muffler for an engine having a housing with an inlet and an outlet spaced from each other, at least two conduit and chamber units connected in series within said housing, attenuation material surrounding said units within said housing, at least one said conduit and chamber unit having a conduit extending from said inlet in the housing to within a chamber of said unit, said conduit having perforations in the walls thereof both inside and outside said chamber, baffle means carried by each conduit for diverting exhaust gases through the perforations in the walls of said conduit, said chamber having perforations formed through the walls thereof to permit communication from within said chamber to the attenuation material in said housing, at least one other one of said units having means connecting a chamber with said outlet, an inlet conduit of said last-named unit extending from within an immediately preceeding chamber of a conduit and chamber unit to within the chamber of said last-named unit, whereby sound waves and heat carried by exhaust gases are dispersed and dissipated through successive conduit and chamber units in series arrangement until said gases are discharged from the outlet in a quieter and cooler condition.

Claim 8

In a muffler for an engine having a housing with an inlet and an outlet spaced from each other, at least two conduit and chamber units connected in series within said housing, attenuation material surrounding said units within said housing, at least one said conduit and chamber unit having a conduit extending from said inlet in the housing to within a chamber of said unit, said conduit having perforations in the walls thereof both inside and outside said chamber, baffle means carried by each conduit for diverting exhaust gases through the perforations in the walls of said conduit, said chamber having perforations formed through the walls thereof to permit communication from within said chamber to the attenuation material in said housing, at least one other one of said units having means connecting a chamber with said outlet, an inlet conduit of said last-named unit extending from within an immediately preceeding chamber of a conduit and chamber unit to within the chamber of said last-named unit, whereby sound waves and heat carried by exhaust gases are dispersed and dissipated through successive conduit and chamber units in series arrangement until said gases are discharged from the outlet in a quieter and cooler condition.

Claim 9

In a muffler as claimed in claim 6 wherein said baffle means in said conduits are spiral-shaped baffles for diverting the gases along a spiral-shaped path.

Claim 10

The muffler as claimed in claim 6 wherein three conduit and chamber units are mounted in the series arrangement with the sound waves and heat of the gases passing successively from one unit to the next as part of said sound waves and heat pass through the perforations in the walls of the chambers and are dissipated by said attenuation material.

Claim 11

The muffler as claimed in claim 6 wherein the remote end of each conduit is closed so as to force the exhaust gases to pass through the perforations in the side walls of said conduit and into either the attenuation material or into the associated chamber of its conduit and chamber unit.

Claim 12

In a muffler for an internal combustion engine having a housing with an inlet and an outlet, at least two conduit and chamber units connected in series within said muffler, a conduit of the first of said units being connected to said inlet and extending to within a chamber of said unit, a second conduit and chamber unit having said outlet of said housing extending into a chamber of said second unit and having a conduit extending from within a chamber of a preceeding conduit and chamber unit to within said chamber of said second conduit and chamber unit, attenuating and insulating material surrounding said units within said housing, each conduit and chamber unit having perforations formed through the walls thereof, spiral baffle means mounted in each conduit for diverting exhaust gases into a spiral path and through the perforations in the walls of said conduit and into the chamber of its associated conduit and chamber unit, the interior of each chamber communicating with the attenuating and insulating material in said housing through the perforations in said chamber whereby sound waves and heat carried by exhaust gases are dispersed and dissipated partially into said attenuating and insulating material and partially through successive conduit and chamber units in series arrangement until said gases discharged from the outlet at a substantially reduced sound and heat level.

Claim 13

In a muffler for an internal combustion engine having a housing with an inlet and an outlet, at least two conduit and chamber units connected in series within said muffler, a conduit of the first of said units being connected to said inlet and extending to within a chamber of said unit, a second conduit and chamber unit having said outlet of said housing extending into a chamber of said second unit and having a conduit extending from within a chamber of a preceeding conduit and chamber unit to within said chamber of said second conduit and chamber unit, attenuating and insulating material surrounding said units within said housing, each conduit and chamber unit having perforations formed through the walls thereof, spiral baffle means mounted in each conduit for diverting exhaust gases into a spiral path and through the perforations in the walls of said conduit and into the chamber of its associated conduit and chamber unit, the interior of each chamber communicating with the attenuating and insulating material in said housing through the perforations in said chamber whereby sound waves and heat carried by exhaust gases are dispersed and dissipated partially into said attenuating and insulating material and partially through successive conduit and chamber units in series arrangement until said gases discharged from the outlet at a substantially reduced sound and heat level.

Claim 14

A muffler for An engine having a housing with an inlet and an outlet, plural sound and heat dissipating means connected in series within said housing, attenuation material surrounding said plural means within said housing, each of said means having a chamber and an inlet conduit with said inlet conduit extending into said chamber, the inlet conduit of the first of said means being connected to the inlet in said housing and the chamber of the last of said means being connected to the outlet in said housing, the inlet conduit of each successive one of said means having perforations through the walls thereof and being connected to the chamber of the immediately preceeding means, each chamber of said means having perforations formed through the walls thereof to permit communication from within said chamber to the attenuation material in said housing, whereby sound waves and heat carried by exhaust gases are dispersed and dissipated through the successive means and into said attenuation material until said gases are discharged from the outlet at a substantially reduced level of sound and heat.

Claim 15

A muffler for An engine having a housing with an inlet and an outlet, plural sound and heat dissipating means connected in series within said housing, attenuation material surrounding said plural means within said housing, each of said means having a chamber and an inlet conduit with said inlet conduit extending into said chamber, the inlet conduit of the first of said means being connected to the inlet in said housing and the chamber of the last of said means being connected to the outlet in said housing, the inlet conduit of each successive one of said means having perforations through the walls thereof and being connected to the chamber of the immediately preceeding means, each chamber of said means having perforations formed through the walls thereof to permit communication from within said chamber to the attenuation material in said housing, whereby sound waves and heat carried by exhaust gases are dispersed and dissipated through the successive means and into said attenuation material until said gases are discharged from the outlet at a substantially reduced level of sound and heat.

Claim 16

In a muffler as claimed in claim 11 wherein spiral baffle means are mounted in each conduit for diverting exhaust gases into a spiral path and through the perforations in the walls of said conduit.