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Патент USA US3090474

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May 21, 1963
F. E. DEREMER
3,090,454
SYSTEM AND APPARATUS FOR SoUND-ATTENUATTON 0F GAS STREAMS
Filed Aug. 8, 1958
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ATTORNEY
May 21, 1963
F. E. DEREMER
3,090,464
SYSTEM AND APPARATUS FOR SOUND-ATTENUATION OF GAS STREAMS
Filed Aug. 8, 1958
2 Sheets-Sheet 2
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INVENTCR:
FL @YD E. DEREME'R.
W ATTORNEY
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United States Patent Office
3,090,464
Patented May 21, 1963
g
pipes or tubes of comparatively short length may be
employed for conveying gases from the engine manifolds
SYSTEM AND APPARATUS FÜR SOUND-ATTENU
to the sound-attenuating muiiler or unit.
ATIUN 0F GAS STREAMS
The invention embraces a system »and apparatus for
Floyd E. Deremer, Livonia, Mich., assigner to @ldherg Ul attenuating sound waves entrained in multiple exhaust
Manufacturing Company, Grand Haven, Mich., a cor
gas streams from an internal combustion engine in a
poration of Michigan
single unit or muffler disposed to accommodate the ex
Filed Aug. 8, 1953, der. No. 753,984
haust gas streams from both banks of cylinders of an
6 Claims. (Cl. Mlm-57)
engine Lwithout objectionable back pressure.
Another object of the invention resides in the pro
This invention relates to a sound-attenuating system
vision of a sound-attenuating apparatus or muffler of a
and apparatus particularly adapted for use with the ex
character particularly adapted to be disposed or posi
haust gas stream or streams from an internal combustion
tioned transversely of a vehicle and forwardly of the
engine of an automotive vehicle and more particularly
internal combustion engine or prime mover and adapted
to an exhaust gas conveying arrangement and a gas
3,699,464
blending and sound-attenuating means for attenuating
to
sound waves entrained in the gas streams.
At the present time the trend in the development and
multiple banks of engine cylinders wherein the exhaust
gases are admitted into the ends of the sound-attenuating
accomodate multiple exhaust gas
streams from
manufacture of automotive vehicles is a more extensive
apparatus in a manner wherein a blending `of the gases
of the streams is effected within the sound-attenuating
embodying two parallel banks of cylinders such as an 20 means and eiïicient sound-attenuation obtained and the
spent exhaust gases discharged from the sound-attenu
eight cylinder engine with four cylinders in each bank,
ating unit or muiiier through one or more outlets.
an individual exhaust manifold being employed with each
Another object of the invention is the provision of a
bank of cylinders and two or more sound-attenuating
sound-attenuating system for an internal combustion
means or mulilers embodied in the exhaust duct arrange
ments accommodating the gas streams issuing from the 25 engine of an automotive vehicle wherein sound waves
throughout the objectionable sound wave range of the
exhaust manifolds.
use of multi-cylinder engines particularly of the type
exhaust gas stream or streams may be satisfactorily at
The use of multi-cylinder engines wherein the cylin
tenuated within a single mufñer or sound-attenuating unit
ders are arranged in banks augments the difficulties of
whereby the cost of sound-attenuating apparatus for
conveying the exhaust gases from the engine and pro
viding apparatus which will satisfactorily attenuate or 30 exhaust gas systems is substantially reduced over prior
systems.
dampen objectionable sound waves in the exhaust gas
streams without appreciably increasing back pressure
Another object of the invention is the provision of an
exhaust gas disposal system and attenuating apparatus
in the exhaust gas ducts and sound-attenuating means.
for exhaust gas streams of a vehicle engine wherein
Another factor inñuencing the use of exhaust gas
manifolding or conveying means for each bank of cylin 35 secondary sound-attenuating means o-r resonators are
eliminated without the sacrilice `of proper sound-atten
ders and a plurality of sound-attenuating means is the
nation.
trend toward substantial increase in the horsepower of the
Another object of the invention is the provision of
engines which necessarily involves an increased volume
a single unit intercalated in an exhaust gas system of nn
of exhaust gases to be disposed of and sound waves of the
internal combustion engine for blending multiple ex
gas streams attenuated. A single mulller in each stream
haust gas streams from banks of cylinders of a multi
in order to satisfactorily attenuate sound waves would
cylinder engine wherein pressure impulses in the exhaust
have to be of substantial length.
gas streams of irregular occurrence are blended together
The trend in vehicle design toward lowering of the
to smooth out the pressure impulses and effectively
frame construction of the vehicle requires an increase
attenuate sound waves entrained in the streams.
in the number of reinforcing cross members in the frame
Another object of the invenion is the provision of a
construction for proper strength, and the space beneath
combined gas blending and sound-attenuating unit par
the vehicle body to accommodate a single sound-attenuat
ticularly adapted for installation forwardly of the engine
ing muffler means of a length adequate to properly at
tenuate the sound waves is inadequate. Hence automo 50 adapted to receive dual exhaust gas streams from the
engine, the unit being provided with gas passage means
Ítive vehicle manufacturers have, in many installations,
in transverse spaced relation, the walls of the gas passage
employed additional resonators or supplemental sound
means being formed with openings or open areas provid
attenuating mufñers arranged in series in each of the
ing acoustic couplings with suitable chambers for attenu
exhaust gas conveying means from the individual mani
ating sound waves and facilitating transverse flow and
folds of the engine as an expedient to attenuate sound
blending of exhaust gases which are discharged from the
waves over the objectionable wave range.
unit through one lor more outlets adjacent the front
Sound-attenuating systems of this character are costly
wheels of a vehicle.
because `of the number of muíilers and resonators re
Further objects .and advantages are within the scope
quired. As the resonators 'are spaced rearwardly of the
muiliers in each exhaust gas duct arrangement, there is a GO of this invention such las relate to the arrangement, oper
ation and function of the related elements of the struc
definite tendency for moisture condensation to form in
ture, to various details of construction and to combina
the resonators as the temperature of the exhaust gases
tions of parts, elements per se, and to economies of
in the resonators is substantially reduced due to their
manufacture and numerous other features las will be
remote positioning from the engine. Moisture causes
rapid oxidation or rusting of the metal of the resonator 65 apparent from a consider-ation of the speciñcation and
drawing of a form ‘of the invention, which may be pre
units and in a short period of time must be replaced.
ferred, in which:
The present invention embraces the provision of an
FIGURE l is a schematic plan view of an automotive
exhaust gas conveying and sound-attenuating system
vehicle illustrating the exhaust system embodying a form
especially adapted to receive and accommodate multi
of combined lgas blending and sound-attenuating unit of
ple exhaust gas streams wherein a single muffler unit or
sound-attenuating unit is disposed transversely of the
vehicle and forwardly of the engine whereby the exhaust
the invention ‘arranged forwardly of the engine of the
vehicle;
3,090,464.
3
FIGURE 2 is a schematic elevational view of the ar
rangement illustrated in FIGURE l;
FIGURE 3 is a schematic partial plan View illustrating
the system embodying another form of combined gas
blending and sound-attenuating unit of the invention;
vwheels 2S of the vehicle for driving the same in a con
ventional manner. The vehicle is equipped with conven
tional front wheels
rthe bank of cylinders 18 is
provided with an exhaust manifold .32 having four
branches connected with the exhaust openings in the en
FIGURE 4 is a longitudinal sectional view of the com
gine block or bank lltâ and through which the exhaust
bined gas blending `and sound-attenuating unit of the
gases from the cylinders in block 18 are delivered into
the manifold 32. A manifold
substantially identical
invention;
FIGURE 5 is a transverse sectional View taken sub
stan-tially on the line 5_5 of FIGURE 4;
FIGURE 6 is a longitudinal sectional view showing
with manifold 32 is provided for conveying exhaust gases
from the cylinders in the block 2t?.
Disposed forwardly of the engine ‘r6 and adjacent and
'another form of combined gas blending and sound-atten
rearwardly of the bumper i2, is a combined gas blending
uating unit of the invention provided with a single exhaust
gas outlet, `and
FIGURE 7 is a schematic sectional view illustrating
another form of combined gas blending and sound-atten
uating unit of the invention.
The invention has particular utility with the exhaust
gas system of a multi-cylinder engine of the type embody
and sound-attenuating unit or muñier 36 supported by
suitable means (not shown), the muñler 36 being illus
trated in further detail in FIGURE 4. As shown in
FÍGURE 1, the mu?ler or gas blending and attenuating
unit 36 is of substantial length and, within the limitations
of khe width of the vehicle, may be made of a length of
lthree feet or more to provide for the attenuation of a
ing parallel banks of cylinders such as an eight cylinder
broad range of sound waves entrained in the exhaust
engine with four cylinders in each bank rwherein the com
bined gas blending land sound-attenuating unit is disposed
gas streams from the manifolds 32 and 34'.
As shown in FIGURE 4, the gas blending and sound
forwardly of the engine and extends longitudinally in a
rattenuating unit 36 is inclusive of a shell 33 which is pref
direction transversely of the vehicle. A separate or in
erably of oval or ovoidal shape in cross-section as shown
dependent exhaust manifold is provided to accommodate
in FÍGURE 5. The shell 3S is preferably formed with
exhaust gases from each bank of cylinders and `the mani
folds are connected respectively with the ends or end
a double wall which may be in the form of two sheets 40
and 42 of metal which may be joined by means of a fold
or seam d4 or they may be welded together. The shell
construction may be fashioned of a single sheet of metal
wrapped upon itself to form a double wall. As shown
in FIGURE 5 one or" the walls may be formed with longi
regions of the gas blending and sound-attenuating unit
and the exhaust gases discharged from the unit through
one or more outlets at a region adjacent one or both
front wheels `of the vehicle or the exhaust gases may be
conveyed by suitable means to the rear of the Vehicle for
‘tudinally extending ridges engageable with the other wall
discharge to the atmosphere.
for spacing the walls providing an air chamber between
The conventional eight cylinder engine comprises two
them to assist in damping or reducing shell noise.
banks of cylinders arranged in parallel lengthwise of the 03 C31 The mutlier construction 36 is provided with end heads
Vehicle and the pistons are connected to a single crank
4o and út7 formed Iwith peripheral ñange portions ¿i8 which
shaft. Such arrangement does not permit of successive
tiring cylinders alternately from each bank of cylinders
throughout a tiring cycle of the eight cylinders.
During a complete cycle of tiring of all eight cylinders
of the engine, there are two periods wherein the combus
tible mixture charges of two cylinders of one bank are
tired or ignited in succession and two cylinders of the op
posite bank ñred in succession, the others being alternately
embrace «the ends of the shell 38 to provide fluid-tight
>seals or connections. Each of the end heads
and 47 is
formed with -a flange portion 5% defining an inlet open
ing adapted to accommodate a tubular inlet fitting or
coupling 52. The inlet iitting 52 in the end head d6 is
connected by means of an exhaust pipe Sfr and a coupling
55 with the exhaust manifold
The inlet iitting 52
in the end head ¿t7 is connected by means of an exhaust
pipe 56 Iand a coupling 57 with the exhaust manifold 34.
Thus the streams of exhaust gases from the manifolds 32
and 34- are conducted into the ends of the mufñer 35.
The mui’der 36 is formed interiorly with gas passage
means and transverse partitions or walls forming cham
tired from opposite banks. This condition results in two
exhaust impulses in succession in one manifold and two
exhaust impulses in succession in the opposite manifold,
while the yother four cylinders are `ñred in alternate rela
tion from each bank. rïhe irregular exhaust impulses in
each manifold, where the exhaust is conducted through a 50 bers, the latter being in communication with gas passage
conventional muñler, causes a throbbing or pulsing sound
means for blending exhaust gases ñowing into and through
which is not satisfactorily attenuated or mutfled. The
the muffler and concomitantly attenuating sound waves
exhaust gas system of the present invention includes a
entrained in the exhaust gas streams. As shown in FIG
combined gas blending and sound-attenuating unit posi
URE 4, there is aligned with the inlet fittings 52 a gas pas
tioned forwardly of the engine and preferably adjacent 55 sage means or tube ‘dit which, in the embodiment illus
the front bumper extending transversely of the vehicle
trated, extends lfull length of the muifler and receives and
and which is of `a length wherein sound-attenuation over
accommodates both exhaust gas streams from the engine.
Disposed within the mufñer shell and extending trans
single unit and the irregular exhaust pressure impulses
versely of the chamber formed by the shell is a plurality
equalized within the unit.
60 of walls or partitions designated from left to right by
With particular reference to FIGURES 1 and 2, the
numerals 62, 63, 64, 65 and ed. The partition 62 is spaced
outline of a top plan vierw of a vehicle body is illustrated
from the end Wall 47 to provide a resonator chamber 68
-at l@ carried or mounted upon a suitable frame structure
and a similar chamber 7 G is provided between the partition
(not shown) the vehicle being equipped with front and
66 and the end wall 46. Surrounding the gas passage
the objectionable sound wave range may be had in a
rear bumpers designated respectively l2 »and t4. Sup
ported at the forward region of the frame structure of
ing end portions 73 which surround the periphery of the
the vehicle is an internal combustion engine lo of the
gas passage tube di).
eight cylinder type having two banks or blocks of cylinders
«designated 1S and Ztl respectively, each bank containing
four cylinders. The vehicle is equipped with a steering
wheel 22 and front seats diagrammatically illustrated
72 are secondary annular partitions or walls ’74 providing
a series of high frequency sound-attenuating chambers 76
at 24.
The engine 1S is connected through suitable transmis
sion or speed change mechanism (not shown) contained
within a housing 26 arranged to be connected to the rear
means or tube 6d is a cylindrical member or tube 72 hav
Disposed within and spaced lengthwise of the member
for attenuating high frequency sound waves. The second
ary partitions 74 may be spaced as desired to secure the
most e?lìcient attenuation of high frequency waves. The
wall of the gas passage means or tube 6u is provided with
a substantial number of small openings Sd which are in
3,090,464.
6
communication with the high frequency attenuating cham
permitting the circulation of gases through the chambers
bers 76 and form acoustic couplings with the chambers.
The partitions 62 through 66 deline compartments or
chambers 67 which not only function as sound-attenuating
provide acoustic couplings with the chambers 68 and '70
for attenuating sound waves of lower frequencies entrained
chambers but also serve as gas transfer passages to facil
63 and 70. The openings 88’ in the wall of the tube 82
Ul
itate the iiow of gases from the gas passage means 60
into a second gas passage means or tube 82. The wall of
the cylindrical member 72 surrounding the gas passage
tube 66 is provided with a substantial number of perfora
tions or openings
in the gases.
The baffles 62 through 66 are provided with open
ings defined by lianges through which extends a resonator
tube 94, the ends of which open into the chambers 68
and 76 respectively. Disposed within the resonator tube
spaced lengthwise and peripherally of
94 and approximately midway between the ends thereof
is an unperforated baffle, wall or plug 96 which separates
the tube 94 into low frequency resonator chambers 97
and 98. The gases flow from the tube 32 through the
discharge pipes litt). The discharge pipes or outlets 16€)
may be bent through approximately ninety degrees as
shown in FIGURE l rearwardly of the vehicle and in
the member 72 providing means whereby the gases ñow
transversely through the openings 80 in the wall of the
tube 60 thence through the chambers 76 and openings or
perforations 84 into the chambers or transverse gas pas
sage means 67.
The tube 82 extends substantially full length of the muf
iier shell 38 through openings provided in the partitions
clined downwardly as shown in FIGURE 2 to direct the
exhaust gases in a region adjacent the front wheels 30
being equipped with outlet fittings 86 extending through
of the vehicle for dissipation in the atmosphere. During
suitable openings formed in the end heads 46 and 47. As 20 movement of the vehicle, the rotation of the front Wheels
or walls 62 through 66, the end regions of the. tube 82
shown in FIGURE 4, the wall of the tube 82 is formed
throughout its full length with a plurality of comparatively
small openings 8S to accommodate the transverse flow of
tends to disperse the exhaust gases ñowing from the outlet
gases through the passages 67 into the tube or gas passage
exhaust gases from the two banks of cylinders 18 and 20
means 82.
The chambers 68 and 70 are in communication with the
tube 82 by means of the openings 8S which form acoustic
couplings with these chambers, the chambers serving to attenuate sound waves of lower frequencies. It should be
noted that in the embodiment illustrated in FIGURE 4,
the wall portions of the inlet gas passage means 60 ad
jacent the resonator chambers 68 and 70 are imperforate
so that all of the exhaust gases entering the inlet gas pas
sage means 66 flow transversely through the passages or
chambers arranged between the partitions 62 and 66.
The exhaust gases ñowing through the outlet fittings
86 may be discharged through outlet pipes 106, shown in
or tail pipes 16€).
hrough the foregoing described arrangement, the
25
of the engine are delivered through comparatively short
pipes into the respective ends of the mutiier 36 and are
blended within 4the gas passage means 6i), the gases tiowed
transversely into the tube 62 thence lengthwise of the
tube 32 in opposite directions for discharge through the
outlet pipes lili).
The pressure impulses in the gas streams tend to be
equalized and sound waves, both high and low frequency,
are effectively attenuated by reason of the substantial
length of the muffler. The region between the baiiies 62
and 66 provide an ample area for the transverse iiow of
exhaust gases from the gas passage means ‘66 into the
gas passage means 82 without setting up or creating
appreciable back pressure within the muiiier construction.
FIGURES 3 and 6 illustrate a modified form of muifler
ward the roadway adjacent the front wheels of the vehi
cle. If desired, a tube or pipe (not shown) may be con 40 construction adapted for mounting forwardly of the
engine of a vehicle. The engine 16' shown diagram
nected to each of the outlet pipes 166 and convey thel ex
FIGURES l and 2 which direct the gases angularly to
haust gases to the rear of the vehicle.
The system and apparatus shown in FIGURES 1, 2, 4
and 5 is as follows: During the operation of the engine,
the exhaust gases `are delivered from the engine through
the manifolds 32, 34 and the exhaust pipes 54 and 56 into
the opposite ends of the muffler and enter the muifler
through the fittings 52 into the inlet gas passage means 6th
As previously mentioned, the exhaust impulses in an eight
cylinder engine are nonuniform because of the nonuni~
matically in FIGURE 3 is of the same type as shown at
16 in FIGURES l and 2 and includes banks of four cylin
ders designated 1S’ and 20’ which are respectively pro
vided with exhaust manifolds 32’ and 34’ adapted to be
respectively connected ‘to the inlet gas passage means of
a muffler 110 through the medium of tubes S4’ and 56'.
FIGURE 6 is a longitudinal sectional View through the
muñler construction 11i) shown in FIGURE 3.
The shell construction 112 of the muiiier 110 may be
form firing order. Hence the incoming pressure impulses
of the same construction as shown in the embodiment
of the exhaust gases effect a surging of the gases within the
illustrated in FIGURE 4. The shell is provided with end
heads 114 and 116, the central regions of the end heads
being formed with iianged openings adapted to receive
tube 60 and as the gases from the manifolds are in direct
opposition in the gas passage means 60», the pressures with
in the tube 60 tend to be equalized and the irregular pres
sure impulses are smoothed out or blended within the
mutller.
The gases from the engine entering the exhaust inlet
coupling tubes 118 and 126 which are respectively con
nected with the pipes 54’ and 56', shown in FIGURE 3,
through which the exhaust gases from the engine are
conducted into a first gas passage means or tube 122 dis
posed within the shell 112 and extending into the cou
through the openings 80 in the wall of the tube 6€) forming 60 plings 11S and 126 as shown in FIGURE 6.
Disposed within and spaced lengthwise of the shell 112
acoustic couplings with the intermediate shell or tube 72
are baffles 124, 125, 126, 127 and 128, adjacent pairs of
surrounding the tube 60 and spaced therefrom and high
the ba‘fiies forming chambers 13€). The baiiie 124 with
frequency sound waves are attenuated in the chambers
the end head 116 forms a resonator chamber 132 adja
The wall of the tube. 72 is provided with a comparatively 65 cent the left end of the muilier construction as viewed in
FIGURE 6, and the bathe 128 forms with the end head
large number of small openings 84 facilitating gas flow
114 a resonator chamber 134 at the right end of the
through openings 8S into the tube 82;. The baflies 63, 64
muffler construction shown in FIGURE 6.
and 65 are each provided with four or more openings 92,
The baffles 124» through 12% are provided with flanged
shown in FIGURE 5, to facilitate lengthwise flow of the
gases between the baffles 62. and 66.
70 openings at the central regions thereof to accommodate an
Thus gases within the tube 60 may ñow transversely at
intermediate shell or tubular member 136 which is spaced
all regions between the battles 62 and 66 into the second
transversely from and preferably concentric with the gas
gas passage means 60 move laterally or transversely
gas passage means or tube 82. Thel gas passage tube 82
at the region of its passage through the chambers 68 and
'70 is provided with a plurality of openings or outlets 88’
passage means or tube 122. The space between the gas
passage means 122 and the intermediate shell or tube 136
is subdivided lengthwise into compartments by means of
3,090,464
annular members 133 which form a plurality of high fre
quency sound-attenuating chambers between the gas pas
sage means 122 and the surrounding tube 136.
The region of the batile 124 adjacent the gas passage
means 122 is provided with a llange 14d engaging the
tube, and the baflie 123 is provided with a similar ñange
141 engaging the gas passage means or tube 122 to iso
late the resonator chambers 132 and 134 from communi
front wheel or may be conveyed to the rear of the ve
hicle by means of -an extension pipe `156 shown in broken
lines in FIGURE 3. It should be noted in the arrange
ments of FIGURES 4 and 6, the exhaust gases traverse
and circulate in all regions interiorly of the muffler so
as to prevent pocketing or accumulation of condensation
which would tend to rust or disintegrate the mufller.
rounding intermediate shell or tube 136. The wall region
of the tube or gas passage means 122 between the battles
FIGURE 7 illustrates diagrammatically another form
of combined gas blending and muflier construction of
the invention. In this arrangement, a shell 16d which
may be of the character of the shell illustrated in the
124 and 12S is provided with a plurality of compara
tively small openings 142 and the wall of the intermediate
forms of the invention shown in FIGURES 4, 5, and 6
is provided with end heads 162 and 164i. Extending
shell or tube 136 is likewise provided with a large number
through openings in the central regions of the end heads
are coupling tubes 166 and 163 which accommodate the
cation With the space between the ltube 122 and its sur
of comparatively small openings 144.
Disposed in parallelism with the gas passage means 122
respective ends of a gas passage means or tube 171)
is a second gas passage means or tube 1416. The end head
extending throughout the length of the mu‘liler shell `and
adapted to convey exhaust gases into the interior of the
mufñer through both coupling tubes 166 and 168.
Disposed within and spaced lengthwise of the shell 160
are transversely extending baffles, walls or partitions 172,
114 is formed with a flanged opening to accommodate an
exhaust outlet coupling or tubular member 148, one end
of the tube 146 extending into the coupling 143, the other
end of the tube 146 extending through a flanged opening
in the bali’le 124 establishing communication between the
interior of the tube and the resonator chamber 132. The
intermediate batlles 125 through 12S are provided with
flanged openings to receive and accommodate the gas 25
passage tube 146 as illustrated in FlGURE 6.
The Wall of the region of the tube 146 between the
bathe 124il and the battle 123 is formed with a large number
of comparatively small openings 15d. The region of the
-tube 146 between the battle 12S and the end head 114 is
provided with a large number of small openings 150’ for
establishing communication with the resonator cham
ber 134.
In the form of construction shown in FIGURES 3 and
6, the exhaust gases from the manifolds 32’ and 34’ enter
173, 174 and 175. The baffle 172 with the end head 164
forms a resonator chamber 177, and the baiiie 175 forms
with the end head 162 a resonator chamber 17S. The
battles 172 through 175 are provided with openings to ac
commodate an intermediate shell or tabular member 179
surrounding and spaced from the gas passage means or
tube 171B. The end head 162 is provided with an opening
to accommodate a tubular coupling 18d which is in regis
tration with a second gas passage tube 182 extending
through openings in the baiiles 172 through 175, the tube
180 opening into but not extending through the low fre
quency resonator chamber 177.
The end head 164 is provided with an opening to ac~
commodate a tubular coupling member 184 which is in
respectively through the pipes 5d' and 5d’ and couplings
registration with a third gas passage means or tube 186
118 and 121) into the respective ends of the gas passage
which extends substantially parallel with the tubes 170
and 1&2 and is spaced transversely therefrom, the tube 186
extending through openings formed in the battles 172
means or tube 122.
As the gases from the two banks of cylinders ilow into
opposite ends of the tube 122, pressure impulses which
are unequally spaced in point of time are substantially
equalized or blended Within the tube 122. The exhaust
gases moving through the tube 122 dow transversely in
the regions between the batiies 124 and 128 through the
openings 142 in the gas passage tube 122 and the open
ings 144 in the intermediate shell or tube 136 transversely
through the chambers 13d and the openings 151i' into the
tube 146 thence outwardly through the exit coupling 143
through 175. The gas passage tube 186 opens into but
does not extend through the resonator chamber 178, the
latter forming a means for attenuating low frequency
sound waves.
The walls of the gas passage tubes 17%, 182 and 136
at the regions between the bañles 172 and 175 are formed
with a large number of comparatively small openings and
the intermediate shell or tubular member 179 surrounding
the gas passage tube 17€? is formed with `a large number
into an exhaust conveying tube or pipe 15d for discharging
of small openings. The openings in the tubes 170, 132,
the gases from the mutiier to the atmosphere.
50 179 and 186 provide acoustic couplings with the adjacent
Each of the bafñes 125, 126 and 127 is provided with
chambers and form means facilitating transverse or lat
four openings of the comparable size and character illus~
eral flow of exhaust gases from the inlet exhaust gas pas
trated at 92 in FIGURE 5. The openings in these bañ’ies
sage means 17@ to the gas passage tubes or means 182
provide for movement of gases lengthwise of the shell be
and 186.
tween the end bañles 124 and 128. The chamber 132, in
In this form of construction the exhaust gases from the
communication with the end of the gas passage tube 146,
engine manifolds of the character shown in FIGURES l
provides a resonator chamber for attenuating low fre
and 3 enter the gas passage tube 17d at its ends, the gases
quency waves and the chamber 134 in communication
moving transversely through the openings in the gas pas
with the gas passage tube 146 through the medium of the
sage tube 171? and the intermediate shell 179 enter the
openings 150’ also forms a resonator chamber for attenu 60 tubes 182 and 186 through the openings in the walls
ating low frequency sound waves.
thereof. rl`he exhaust gases are discharged through the
In the arrangement shown in FIGURES 3 and 6, the
couplings 18d and 1e@ which are equipped or provided
exhaust gases from the engine are blended together in the
with pipes of the character indicated at 154 in FIGURE
gas passage means or tube 122 and high frequency sound
3 for directing the exhaust gases toward the regions of
waves are attenuated in the chambers provided between
the front wheels. The exhaust gases may be conveyed to
the rear of the vehicle through the use `of extension tubes
the tube wall of the tube 122 and the intermediate shell
or tube 136. Ample area for the transverse flow of gases
of the character indicated in broken lines at 156 in FIG
through the muñier from the gas passage means 122 to
URE 3. The operation of the muffler shown in FIG
the second gas passage means 146 is provided through the
URE 7 is substantially the same as the other forms `of
large number lof openings or acoustic couplings 142, 144 70 the invention, the gases entering the respective ends of
and 150 whereby a minimum of back pressure is en
the first gas passage means 17u and ñow transversely into
countered by the gases in `their movement through the
the second and third gas passage means 182 and 186 and
mufñer.
are discharged therefrom. The muiîler unit 161) is adapted
The exhaust gases delivered from the muiiier through
to be mounted forwardly of the Vehicle engine in the same
the pipe 154 may be projected toward the region of the 75 manner as shown in FIGURES l and 3.
:3,090,464
It is apparent that, within the scope lof the invention,
modifications and different arrangements may be made
other than is herein disclosed, and the present ydisclosure
is illustrative merely, the invention comprehending `all
variations thereof.
I claim:
l. A mufiler for use with the exhaust gas streams from
dual manifolds of an internal combustion engine of a
vehicle, the combination of an elongated chamber hav
ing end closures, each of said end closures having an in
let opening, exhaust gas conveying pipes connecting the
exhaust manifolds with the inlet openings arranged to
conduct streams of exhaust gases from the engine through
the openings in the end clo-sures into the chamber, a first
tubular gas passage means in said cham-ber registering
with said inlets adapted to receive the streams of gases
entering the respective ends of the chamber whereby to
blend the gases of the streams, a second tubular gas pas
sage means disposed substantially parallel With the first gas
10
being formed with an inlet, exhaust gas conveying tubes
arranged to conduct exhaust gases from the manifolds
through the inlet openings in the end closures into the
chamber, a first tubular gas passage means in said cham
ber connected with said inlets adapted to receive the
streams of gases entering the respective ends of the
chamber whereby -to blend :the gases rof the streams, a
second gas passage means in said chamber, outlet open
ings in said end closures in registry with the second tubu
lar gas passage means, an intermediate shell surrounding
said first gas passage means, the walls of said gas passage
means and said intermediate shell being formed with a
plurality of open yareas to accommodate transverse fiow
of gases from the first -to the second gas passage means,
a plurality of annular members positioned within and
spaced lengthwise of the intermediate shell forming a
plurali-ty of high frequency sound attenuating zones, a
plurality of transversely arranged spaced walls in said
chamber forming compartments through which gases flow
passage means in said chamber, an exhaust gas outlet in 20 from the first to the second gas passage means, one of said
registry with the second gas passage means, an intermedi
end closures forming with an adjacent wall a low fre
ate shell surrounding said first gas passage means, the
quency sound attenuating Zone, at lea-st one of said tubu
walls of the tubular gas passage means and said inter
lar gas passage means being in communication with the
mediate shell being formed with a plurality of open areas
low frequency sound attenuating zone, said open areas in
to Vaccommodate transverse fiow of gases from the first to
said gas passage means and intermediate shell forming
the second gas passage means, annularly shaped means
acoustic couplings with the >adjacent regions in the charn
positioned within and spaced lengthwise of the intermedi
ber, and pipes connected with the outlet openings in the
ate shell forming a plurality of high frequency sound at
end closures for discharging exhaust gases from the
tenuating zones, ya plurality yof transversely arranged
chamber.
spaced walls in said chamber forming transverse passages 30
4. A muñier for use with multiple exhaust gas streams
through which gases flow from the first to the second gas
from dual exhaust manifolds of an internal combustion
passage means, one of said walls forming with an end
engine of a vehicle, in combination, lan elongated shell,
closure a low frequency sound attenuating Zone, at least
one of said tubul-ar gas passage means being in commu
nication with the low frequency sound attenuating Zone,
said yopen areas in said gas passage means and interme
diate shell forming acoustic couplings with the adjacent
end closures for the shell, `a first tubular gas passage means
in said shell extending through openings in the end clo
sures and adapted to receive from the manifolds exhaust
gas streams moving in impinging relation in said means,
lan intermediate shell surrounding the first -gas passage
regions in the chamber, and an outlet pipe connected with
means, partition means between the intermediate shell
said exhaust gas outlet for conveying exhaust gases from
and the first gas passage means defining `a plurality of
the chamber.
40 high frequency sound attenuating chambers, a second
2. A mumer for blending exhaust gases of dual exhaust
tubular gas passage mean-s in said Ishell extending in sub
gas streams from dual manifolds of an internal combus
stantial parallelism with said first gas passage means,
tion engine of an automotive vehicle, the combination of
at least one end of said second gas passage means cx
an elongated chamber having end closures, each of said
tending through an end closure for discharging exhaust
end closures having an inlet, gas conveying pipes arranged
gases from the shell, a plurality of longitudinally spaced,
to conduct exhaust gas streams from the engine into the
transversely extending partitions in »said shell forming a
chamber through the inlets in the end closures, a first
plunality of compartments, the walls of the tubular gas
walled gas passage means in said chamber in registration
passage means and :said intermediate shell in the regions
with said inlets adapted to receive the streams of gases
between ‘adjacent partitions being formed with a plurality
entering the respective ends of the chamber whereby to 50 »of small openings providing acoustic couplings with ad
blend the gases of `the streams, a second walled gas pas
jacent regions and facilitating transverse flow of gases
sage means in said chamber, one of said end closures
from the first gas passage means to the second through
having an outlet, exhaust gas discharge means connected
the compartments, a tubular element in said shell extend
with said outlet for conveying exhaust gases from the
ing between and in Comunication with end regions of the
chamber, an intermediate shell surrounding said first gas
chamber and having imperforate walls, and an abutment
passage means, the walls of said gas passage means and
in
the central portion of the tubular element dividing the
said intermediate shell being formed with a plurality of
same into two low frequency resonator chambers.
open areas to accommodate transverse fiow of gases from
5. A muffler for use with dual exhaust gas streams
the first to the second gas passage means, annularly
from
dual manifolds of an internal combustion engine of
shaped means positioned within an-d spaced lengthwise 60
a vehicle, in combination, an elongated shell adapted to
of the intermediate shell forming a plurality of high fre
be mounted transversely of the vehicle, end closures for
quency sound attenuating zones, a plurality of transverse
the shell, a first gas passage tube in said shell extending
ly arranged spaced walls in said chamber forming corn
full length of the shell and projecting into openings
partments through which gases flow from the first to the
formed in the end closures and adapted to receive exhaust
second gas passage means, each end closure forming with
gas streams from the dual manifolds moving in impinging
an adjacent transverse wall a low frequency sound attenu
relation into both ends of said tube, a second gas passage
ating zone, each of said low frequency sound attenuating
zones being in communication with one of the gas pas
sage means, said open areas in said gas passage means
tube in said shell extending in substantial parallel-ism with
said first gas passage tube, at least one end of said second
passage tube being in registration with ,an outlet open
and intermediate shell forming acoustic couplings with 70 gas
ing in an end closure for discharging exhaust gases from
the adjacent regions in the chamber.
the shell, a plurality of longitudinally spaced, transversely
3. A muffler for use with the exhaust gas streams from
extending partitions 4in said `shell forming a plurality of
dual manifolds of an internal combustion engine of an
automotive vehicle, the combination of an elongated
chamber having end closures, each of said end closures
compartments, the wall of both gas passage tubes ad
jacent compartments forrned by the partitions being pro
vided with a plurality of small openings forming acoustic
3,090,464
11
end closures, a plurality oí longitudinally spaced, trans
versely extending partitions in said shell forming a plural
ity of compartments, the Walls of the gas passage tubes
couplings with the compartments and providing for trans
verse íiow of gases from the iirst gas passage tube to the
second through the compartments, each end closure and
the adjacent transversely extending Wall forming a low
frequency sound attenuating chamber, each low fre
quency sound attenuating chamber being in communica
tion with «one of the gas passage tubes.
and said intermediate shell being formed with `a plurality
Ul
'
of small openings forming acoustic couplings and pro
viding for transverse flow of gases from the first gas
passage tube to the second gas passage tube through the
>6. A muñler for use with the exhaust gas streams from
dual manifolds `of an internal combustion engine of a
compartments, and pipes connected with the outlet open
ings in the end closures for conveying exhaust gases from
vehicle, in combination, yan elongated shell of generally
oval cross-section, end closures for the shell, -a ñrst gas
passage tube in said shell extending full length »of the
shell and projecting into openings formed in the end
the muffler.
References Cited in the file of this patent
UNITED STATES PATENTS
closures and adapted to receive from the manifolds ex
2,026,795
haust :gas streams moving in impinging relation in said
2,078,420
2,356,782
2,370,259
2,520,756
2,658,580
Oldberg _____________ __ Jan. 7,
Sheldrick ___________ __ Apr. 27,
Muller _____________ __ Aug. 29,
Rippingille __________ __ Feb. 27,
Bryant _____________ __ Aug. 29,
'Trembley __________ __ NOV. l0,
said Íirst gas passage tube, said second gas passage tube
2,661,073
2,692,025
Deremer ____________ __ Dec. l, 1953
Maxim ______________ __ Oct. 19, 1954
being in »registration with outlet openings formed in the
2,990,028
Powers _____________ __ June 27, 1961
tube, an intermediate shell surrounding the ñrst gas pas
sage tube, means between the intermediate shell and the
first gas passage tube defining a plurality of high fre
quency sound attenuating chambers, a second gas passage
tube in said shell extending in substantial parallelism with 20
1936
1937
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1945
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1953
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