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Патент USA US3029905

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April 17, 1962
G. A. LYON
3,029,895
MUFFLER STRUCTURE
Filed March 12. 1958
2 Sheets-Sheet l
5/3
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[7.27517 [UP
G'eorye ?/éer/ Lyon
April 17, 1962
3,029,895
G. A.LYON
MUFFLER STRUCTURE
Filed March 12, 1958
2 Sheets—Sheet 2
Al’.
fEYI/Efl frzr'
Geo/ye ?/ber/ Lyon
United States Patent() ” 1C6
3,029,895
Patented Apr. 17, 1962
2
1
FIGURE -1, a tubular casing 10 of suitable length and
inside diameter provides a housingiwithin which a tortu
Y
3,029,895
MUFFLER STRUCTURE
.
George Albert Lyon, Detroit, Mich., assignor to Lyon
Incorporated, Detroit, Mich., a corporation of Dela
ware
Filed Mar.'12, 1958, Ser. No. 720,944
13 Claims. (Cl. 181--44)
ous, impulse-cancelling, but step-by-step forwardly ad
vancing path for the exhaust gas stream is aiiorded by
a coaxial series of force dissipating, impulse damping con
trol ba?ies 11. At one end the casing 10 is provided with
a substantial closure 12 provided with a central tubular
inlet projection 13 adapted to be attached to the end of
a duct leading from the exhaust manifold of an associated
The present invention relates to improvements in
mu?lers and more particularly mu?ders of the type that 10 internal combustion engine. At its opposite end the eas
ing 10 is provided with a separately formed and attached
are adapted for use between the exhaust manifold of ex
exhaust gas exit nozzle closure member 14 tapering to
plosion type internal combustion engines and an exhaust
tail pipe.
~
ward a central tubular exhaust passage extension 15 of
a diameter somewhat larger than ‘the diameter of the
An important object of the present invention is to
provide an improved mu?ler structure which is adapted to 15 inlet extension 13 and adapted to be attached to the trail
ing or entry end of a'tail pipe of an automotive vehicle.
be made in relatively small sizes but is endowed with
At its outside perimeter, the nozzle closure member 15 is
‘large sound damping, explosion mu?lin-g capacity.
provided with an axially extending annular and in this
Another object of the invention is to provide an im
instance outwardly projecting attachment‘?a‘nge 17 dimen
proved muf?er structure embodying a comparatively
simple construction of a minimum number of standard 20 sioned to ?t snugly slidably into the inner side of the
open end margin of the casing 10 and to be there secured
ized parts.‘
'
by any suitable means such as welding, riveting or the
A further object of the invention is to provide a muiller
structure having an improved‘ flow pattern minimizing ac
All parts of the mu?ier unit may be made from suit
cumulations of condensate and thus reducing the‘ suscep
25 able sheet material such as stainless steel, aluminized
tibility of corrosion deterioration.
steel, aluminum alloy, or suitable heat and corrosion re~
Still another object of the invention is to provide an
sistant moldable plastic material having a satisfactory cost
improved mu?ler construction which because of economi
factor. Sheet metal has presently the advantage of eco
cal structure encourages the use of higher grade, more
nomical base cost and mass production manufacturing
corrosion resistant materials.
‘Other objects, features and advantages of the present 30 techniques for forming the desired shapes.
Insofar‘as general shape ‘is concerned, each of the series
invention will be readily apparent from the following de
like.
'
‘
tailed description of certain preferred embodiments-there
of taken in conjunction with the accompanying drawings,
of control ba?les 11 may be identical and therefore a de
scription of one will su?ice for the remainder in this re
in which:
spect. Marginally, each of the ba?les is provided with
. FIGURE 1 is a longitudinal axial diametrical sectional 35 an axially ‘extending annular ?ange 18 of a diameter to
detail view through a mu?ler structure embodying features
of the invention;
?t in snug slidable relation within the tubular longitudi
nal housing portion of the casing 10. While the ?ange
2;
wall may be dimpled at longitudinally opposite ends of
FIGURE 2 is a fragmentary longitudinal axial diamet- 3 18 may be secured to the casing 10 by any suitable means
> such as welding, riveting, and the like, in order to main
rical sectional view similar to FIGURE 1 but through a
40 tain a predetermined axial disposition of the respective
mutller structure showing a modi?cation;
‘ba?le member spacer rings axially between the margins
FIGURE 3 is a partial transverse sectional elevational
of the baffle members may be employed, or the housing
view taken substantially on the line III-—III of FIGURE
'
the attachment ?ange 18 to maintain the axial position of
FIGURE 4 is a partial transverse sectional elevational
detail view taken substantially on the line IV——IV of FIG 45 the ba?le member, or some other suitable retaining ex
URE 2;
FIGURE 5 is an end elevational view of a mother
pedient may be employed to maintain the series of ba?le
members in predetermined spaced relationship.
Axially offset from the margin of the battle member
-in each instance is a central solid ba?le wall or parti
FIGURE 6 is a longitudinal axial diametrical sectional
'tion portion 19 joined integrally to the ba?le margin. by
view through a muffler showing a further modi?cation;
50
FIGURE 7 is a diametrical longitudinal sectional view
a plurality of sinuous cross-section generally accordion
through one of the sound muffling ba?dcs showing steps >
pleat-like open fold juncture and spacer ring ribs com
prising a radially inwardly projecting rib 20 and a radially
in the making thereof;
outwardly projecting rib 21 in return-bent relationship
FIGURE 8 is an assembly view of various components
affording a common substantially radially extending in~
of the mu?ier of FIGURE 6; and
55
termediate wall 22 ‘and affording an axially spaced re
FIGURE 9 is a partial transverse sectional elevational
lationship of the radially inner portion of the baffle
view through a muffler showing still another modi?cation.
member margin and the marginal portion of the o?set
According to the present invention, mu?ling of the
normally explosive percussions of the engine exhaust is
ba?le portion 19, with the intermediate wall 22 in spaced
accomplished by repeatedly breaking the. exhaust stream 60 relation to each of the marginal portions. In a pre
ferred form, the ring ribs 20 and 21 are substantially
into a large number of jet streams directed into head-on‘
identical in radius, with the rib 20 providing a generally
collision with one another in a restricted chamber space
‘radially outwardly opening groove and the rib 21 pro
within which the progressively muffled exhaust stream is
viding a generally radially inwardly opening groove. The
con?ned under only slight back pressure which becomes
outside ring diameter of the radially outwardly projecting
progressively less in each successive chamber until‘ the ex
plosive pulsations have been subdued to such a low pitch
‘rib'21' is sufficiently smaller than the inside diameter of
as to be below an objectionable noise level or to be sub- ‘i the housing portion of the casing 10 to afford a space
or gap therewith at least as great as the width of the
stantially imperceptible within the usual hearing range.
If desired, a preferred pleasant sound may be imparted
groove de?ned by the ring rib 20.
> ~ Each of the ba?les 11 is mounted within the housing
to the exhaust stream by interposing‘ resonators'jin the
70: portion of the casing 10 with the central offset baf?e
path of the stream as it progresses through the mu?der.
portion 19 ‘facing toward the inlet end of the casing, ‘and
In the fairly simple form of 'the invention shown in ‘
showing a further modi?cation;
3,029,895
.
3
4
.
means are provided for movement of the exhaust stream
through the peripheral chamber the mouthof which is
gases through and past the respective baffle members by
way ofthe radially inwardly opening groove provided
‘ axially facing walls'de?ning the ring rib 21, namely the
provided by the margin of the ba?le ‘member 11a and
the juncture ring rib intermediate structure of the ba?ie
member 11]; similarly as describedcin connection with
the baffle member 11a. This muthing cycle is repeated
intermediate wall 22 ‘and the opposing marginal portion
progressively through the remainder of the series of baf
by the ring rib 21. To this ‘end, the opposing generally
‘of the central baf?e member portion 19, are provided 7
?es 11c, 11d, He and 11]‘ until upon escaping past the
with respective series of spaced openings 23. By having
the-openings or ori?ces 23 in the respective series dis
posed directly opposite one another, the exhaust gases
escaping through the openings into the channel groove
, ?nal ba?ie 11]‘ in the series the exhaust gases are sub
- stantially‘, free from explosive impulses and while they
may not be moving without any impulse, there will have
been such impulse decay as to assure such'low register‘
long wave length, ?attened curve pulsations as to beau
10
of the rib 21 as jets under the explosive impulse ‘and
exhaust expansion impinge in head-on collision and by
rally agreeable.
their mutual pressure and the ensuing turbulence have c
In order to implement the gradual leveling out of the '
a sound damping resonance altering, explosion‘ impulse 15 exhaust impulses, gradual expansion of the exhaust gases
cancelling action. The size andtaggr'egate ?ow area of
the flow controlling sets of ori?ces .23- are. predetermined
‘to ‘afford as low a pressure drop'as' practicable consistent
witheifectivemu?ling and to maintain the back pressure '
load’ on ‘the exhaust‘system of the engine as low as ,20
practicable.
‘
'
'
Cylinderdisplacernent and power of the associated eri¢ V
gine are taken into account in determining how many of '
the ba?ies 11 will be desirable for mu?ling ef?ciency
in the tortuous passage through the muffler is afforded
by havingthe collision jet ori?ce openings 23 of pro
gressively: larger aggregate ?ow area from, the ?rst ba?le
member 11a to the last ba?le ‘member 11]‘ in the series.
This may be effected by having ori?ces of the same size
but gradually increasing number inv the respective ba?le
members, or,- as shown by having the ori?ces of the
same number in each of the ba?le members but of pro
' gressively greater diameter in order to attain progressively
greater aggregate ?ow area. In each of the'between baf- ‘
where a single muffler is used for all cylinders or exhaust
ports of the engine. For some engines, therefore, it may ‘ ?e chambers, however, at least’ a slight back pressure is
be necessary to have a larger number of ba?le's and
maintained for muf?ing control. .
, a
therefore-‘a longer unit than shown in FIGURE 1, while
If it is desired to provide the mu?ler with. a character.
for ‘other engines a shorter unit with less baflles may be
istic pleasant sounding tone, or more particularly if it
adequate. Where a plurality of mu?iers is used in an 30 is desired that the exhaust gases issuingv ‘from the muf?er
‘ exhaust, system of an engine, each ‘of, the ,m‘u'f?ers‘ may
have a particular tone quality, soniferous means may be
be smaller than shown both as to diameterjand as to
provided in the mu?ier. A desirable structurefor this
number of ba?les or ‘as to either of these‘ dimensional ' purpose comprises tuning bell members 24 (FIGS. 2
and capacity‘ factors.
,
.
~
‘
'
'
and 3) of which there may be'one or_ more depending.
_
In ‘the illustrated example,‘ six of the baf?es 11 are 35 upon the sound level and tone quality desired. Each of
the tuning bells 2'4 comprises a'genera'lly. cup-shaped
shown in an equally spaced coaxial space. The ?rst baffle '
. 11a in the series is located‘as close as practicable to
member the base portion of which is constructed com
' ple'mentai'y to- and is engageable with the forwardly facing
theentry end closure 12 the wall of which is preferably
of a ?aringform affording-with the ba?ie member 11a‘
surface of the central portion 19 of one of the ‘ba?le mom" I
j the mouth of a ring chamber de?ned about the perimeter 40 here 11, in this instance shownas eitherv or both of the
' of‘ the ring rib 21 and Within the ‘chamber groove of the
b‘a?l‘e member's He and 11]‘, although each of the bathe
'ring rib 20 and thecircurnscribing casing housing wall.
members in the series may be equipped with‘one of the
As indicated bydirectional arrows as the. explosively ' tuning hells. Any suitable means such as respective
impelled exhaust gases enter through the inlet 13, they '
tend to impinge against the central‘ ‘closure portion 19
ofrthe bafhe member 11a and bounce back or atleast def
screws 25 are utilized to secure the tuning bells 24, con» ,
45 centrically ‘at their. centers to the baf?e portions 19.. Mar
?ect in_a radially outward direction under the pressure
"of the exhaust gases advancing thereupon. At this point,
an initial minor impulse cancellation muf?ing action is
eifectedlby having the "central offset ba?ie‘ portion 19' of 50
. dished, concave form, thereby directing the impinging
exhaust gases in a generally interceptingly joining re
lation to the peripheral portions of the exhaust ‘gas stream’
that issuedirectly into the mouth of the peripheral cham'
ginally, the tuning bell in each instance is provided with
a tone producing vibratory. generally axially extending
?ange 27 which extends across the exit from the ring
chamber within the associated ring rib 21 and is. of a
length to lie ‘opposite the ridge of the radially inwardly
projecting ring rib 20 in ‘ample spaced relation to avoid
restricting movement of ‘the exhaust gases'onward thereby.
In order to attain the desired tone quality from the
tuning bells 24,7 materials and drawing or spinning tech
ber about the 'pe'rfo‘ratedring rib 21. By having the
niques are selected. Over tones, and tonal combinations
central ba?ie portion 19 of concave form, moveover, . ‘ can be attained by selection and combining of variously
diaphragm resonance is ‘avoided although because of in
herent resiliencein the portion 19'and the return-bent ring
. tuned bells in any given series.
For example, an auto-~
j,mobile manufacturer may wish to have various models of
‘ribs 20 and 21 a cushioning action under the explosive
automobile identi?ed by the sound of the exhaust. By
impulses of the‘exhaust gases impinging thereagainst, at? ‘ 60 the described expedient, this can be attained. On the
fords. a mu?iing action.
I
‘other hand,‘ individual car owner preferences or aural
identi?cation requirements may be met;
‘
‘ As the exhaust gases unde'rinitial velocity escape
through the “ori?ces 23 of the ?rst ba?ie plate 11a, the
In addition, of course, a further mu?ling control factor
jet streams, collide as indicated by‘ the directional arrows
is'i'nterposed in the exhaust gas stream where'the bell“
. and thenmove radially inwardly uniformly from the ring
members 24 are used.
Although the ‘muf?er may be made in the cylindrical.
chamber defined by the ring rib 21 toward the center
of a control chamber de?ned between the baf?e member v
‘11a and the second baf?e member 1111 in the series’. 'As '
the exhaust gases crowd toward the’c‘enter of ‘_ this inter- .
form shown in FIGURES 3 and 4, an oval form asshown‘
in FIGURE 5 may be provided wherein the muffler "10’
has an elongated. transverse axis enabling‘ it to, be ‘ac:
baf?e- chamber, their impulse force is further displaced“ 70 ‘commodated in a. 110w head room clearance ‘position.
The forward convex'side of thecentral portion 19 of the ,
eba?ie member 110: serves as a forwardde‘?ector'so that .
while the exhaust gases crowd toward the ‘center between
ba?ie chamber ,they, are ‘ also ‘urged forwardly toward
thebaf?e 11b ‘and a repetitionrof insinuating cycle
Other details of the mu?ler. 10' may be the same as shown
' in FIGURES 1-4. .
'
, In FIGURES 6-7, a mu?ler is shown which in‘ general
respects is much the same asthe mu?ier in FIGURE 1
75 both as to structure and ‘operation but embodies a slightly
8,029,895
different or“ modi?ed ba?le structure.
To this end, a
tubular casing 30 is provided affording an elongated
6
Instead of a single circumferentially spaced series of
exahust escape jet ori?ces at each side of the jet impinge
housing for a series of baffle members 31. An integral
. ment, impulse cancellation chamber ring rib, a plurality
inlet extension 32 is provided at one end of the casing and
of series of apertures may be provided as shown in FIG
an attached end closure 33 is provided at the Opposite 5 URE 9 wherein the mu?ler may in other respects comprise
end of the casing and having an exhaust exit extension
structure similar to the muffler 0r FIGURES 1 and 6. To
34 coaxially disposed with respect to the“ casing. Attach
this end, a mu?ier having a casing 45 has ba?ie members
ment of the closure member 33 is by means of an axially
47 therein each having a radially outwardly projecting ring
outwardly extending peripheral attachment ?ange 35
rib 48 affording a chamber into which open a plurality of
dimensioned to engage within the open end margin of 10 series of exahust escape jet apertures 49 coaxially aligned
of the casing 30.
on each side of the ring rib. It will be understood, of
Each of the ba?le members 31 includes a peripheral
course, that as many or as few of the apertures 49 may
generally axially extending ?ange 37 dimensioned to
engage and be secured, if desired, to the inside wall de
be used in all or selected ones of the battle members, or
there may be a selection or particular order of ba?ie
?ning the housing portion of the casing 30. Joining a
radially extending portion of the battle member 31 in each
members some of which have a single series of apertures
instance to a central solid ‘offset portion 38 is a generally
out to take care of particular requirements for operating
while others have two or more series, as may be worked
accordion pleat, sinuously cross-sectioned return-bent fold
conditions.
juncture structure including a radially inwardly project
It will be understood that modi?cations and Variations
ing ring rib 39 and a radially outwardly projecting ring 20 may be etfected without departing from the scope of the
rib 4t) affording a common generally radially extending
novel concepts of the present invention.
wall 41 therebetween. The wall 41 and the overlying
I claim as my invention:
opposite wall of the ring rib ,40, also constituting the mar
1. In a mu?ler structure wherein a casing provides a
ginal portion of the offset central ba?ie member portion
housing with an inlet and an outlet, a ba?le member for
38 are provided with opposed circumferentially spaced 25 disposition within and across the housing, said ba?le
series of exhaust gas escape ori?ces 42 through which the
member including a perimeter for attachment to the
housing and a central portion joined to a marginal por
exhaust gases escape in head~on colliding jet streams sim
tion by an intermediate offsetting generally accordiion
ilarly as hereinbefore described.
pleat-like plurality of radially inwardly and radially outé
In this instance, however, the central ba?le portion 38
is dished to a greater extent than is the case with the 30 wardly directed return-bent ring ribs having a common
wall, one of said ribs having through the opposed walls
central portions 19 of the baffles 11. Thereby, a ring
thereof generally opposed ori?ces through which exhaust
shoulder 43 is provided on the dished portion 38 opposing
gases are adapted to issue in headgon collision within the
the radially inwardly projecting ring rib 3,9 in spaced con
chamber provided by said rib.
'
trol gap relation. Through this arrangement, the ex
2. In a mu?’ier structure, an elongated casing having
haust gases after head-on collision impingement of the 35
small streams or jets escaping through the opposed ori?ce
one end portion thereof constricted and providing artubu
lar inlet and the other end portion thereof normally open,
a generally funnel-like discharge nozzle closing said nor
rib 40 are directed to ?ow in a more or less controlled
mally open end, and a plurality of longitudinally spaced
radially inwardly and axially forward direction toward
and into the relatively deep depression afforded by the 40 ba?ies in said casing between said inlet and said discharge
nozzle, said ba?ies having centrally offset portions with
opposingicentralba?ie portion 33 and thus tending to
intermediate connecting reverse bend ring ribs with ?ow
develop a more or less swirling turbulence within the be
control ori?ces therethrough, said offset portions and
tween ba?ie chamber that leads peripherally to the pe
said ring ribs coacting to afford mu?le cushions.
ripheral ring chamber about the ring ribs 39 and 40 of
3. In a mu?ier ba?le structure, a sheet metal piece of
the next adjacent ba?ie in the series. For some purposes 45
generally cup shape, the margin of the cup being of a per
this form of ba?ie structure and arrangement may have
imeter of substantially greater diameter than the wall of
improved muf?ing characteristics. ,
‘the cup, the wall of the cup comprising radially inwardly
‘in making the battle members 31, a generally cup shaped
and radially outwardly projecting ring ribs of smaller di
shell is drawn or spun including the peripheral attach
ment ?ange 35 and a smaller diameter axial wall ?ange 50 ameter than said perimeter, and perforations in the walls
de?ning one of said ring ribs providing opposed iet
W of ardiameter substantially midway between the ridge
ori?ces.
diameters of the radially inward ring rib 39 and the
4. In a muf?er structure, means providing a housing
radially outward ring rib 40. Then the axial wall W is
having an inlet and an outlet and a ba?ie disposed within
collapsed under controlled conditions to provide the sinu
ous accordion pleat-like folds to a?ord the open groove 55 saidhousing between said inlet and said outlet, said bailie
interrupting ?ow of ?uid from the inlet to the outlet, said
ring ribs 39 and 40, with the ring rib 3‘9 bent toward ‘the
baf?e having a ring rib thereon which projects from the
inner side‘of the axial plane of the wall W and the ring’
apertures 42 into the chamber provided within the ring
rib 40 bent toward the outer side of such plane. , After
inlet side of the battle and de?nes a chamber which opens
toward the outlet side of the baffle, said rib having a pair
the ring ribs have been bent to form, the ori?ce apertures
42 are drilled coaxially through the opposing spaced walls 60 of opposed ring walls, each of said walls having a series
of ori?ces therein, the ori?ces of said walls being in re
de?ning the rib ring 40.
spectively generally opposing relation to each other and
It will be understood that the method of making the
de?ning jet streams of ?uid moving from said inlet through
ba?ie members 41 may be utilized in making the baffle
said ori?ces to collide head-on in said chamber and then
members 11 as Well.
_
,
In FIGURE 8 is depicted the manner'of ‘assembly of 65 move from the opening of the chamber toward said outlet.
5. In a mu?ler structure, means providing a housing
the muf?er of FIGURE 6, although the same method of
assembly is employed in assembling the muf?er of FIG
having an inlet and an outlet and a ba?ie disposed within
said housing between said inlet and said outlet, said ba?ie
URE 1. Each of the ba?le members 31 is successively in
interrupting flow of ?uid from the inlet to the outlet, said
serted into the housing portion of the casing 30 and secured
in its proper spaced relation to the next preceding one of 70 ba?le having a ring rib thereon which projects from the
inlet side of the balile and de?nes a chamber which opens
the ba?le members 31. Finally the end closure exhaust
toward the outlet side of the ba?le, said rib having a pair
outlet member 33 is inserted in place within the‘ end margin
of opposed ring walls, each of said walls having a series
of the casing 30 and secured in place to complete the
of ori?ces therein, the ori?ces of said walls being in ‘re
unit. After the unit has been assembled, suitable external
?nish may be applied if desired.
75 spectively generally opposing relation to each other and
$029,895
7
de?ning jet streams of'?uid moving from‘ said inlet
8 ;
.
siliently ?exible material and having a marginal portion
‘through said ori?ces to ‘collide head-on in ‘said chamber
and then move from the opening of the chamber toward
said outlet, the openinglfrom said ring rib chamber de
in the .form of an accordion pleat-like plurality ofradt
ally inwardly and radially outwardly directed return-bent
. ?ning a mouth directed generally toward the axis of the
siliently yieldable in response to impingement of ?uid
from said-inlet against said ba?le member, ‘said margin‘
al portion having ?uid controlling openings therethrough
by which ?uid passes from the inlet sidetothe outlet side
ring ribs having a common wall, said ring ribs being re‘- 4 '
housing whereby the ?uid leaving the mouth converges
toward said axis. ,
6. In a mu?ier ‘structure, means providingla housing '
of the ba?le to move toward said outlet.
10. In a muf?er structure including means de?ning a
, rhn?le chamber having inlet and outlet ends and a plu
7 ‘having an inlet and an outlet and a ba?le disposed within
said. housing between said inlet and said outlet, said ba?ie 10
‘ , interrupting ?ow of ?uid from the inlet to the outlet, said
ba?lehaving airing rib thereon which projects from the
rality of ba?ies transversely across the’ mu?ie chamber,
each of said ba?ies having a marginal corrugation-like
ring rib projecting generally toward the inlet and pro
toward the outlet side of the baffle, said rib having a pair
of opposed ring walls, each of said walls having a series 15 viding ‘a groove chamber opening toward theoutlet, the
of ori?ces therein, the orifices of said walls being in re
side walls de?ning. the ribs being in substantially parallel
spectively generally opposing ‘relation to each other and
adjacent spaced relation and having opposed ori?ces
inlet side of the ba?le and de?nes a chamber which opens
de?ning jet streams of ?uid moving from said inlet
through which ?uid to be mu?led from the inlet side of
through said, ori?ces to_ collide head-on in said chamber
each of the ba?les passes to the outlet-side thereof in
and then move from theopeniug of the chamber toward 20 jets that collide head-on within the groovechambers of
said outlet, said housing having therein between said baffle
the ring ribs.
tioned ba?le a- chamber into which the?uid‘from said ring
‘therethrough'through which the ?uid from :the ‘chamber
between the lba?ies must pass in controlled’ relation toward
7'
‘
,7
_
i
,
a
_
I
vmuiile chamber having inlet and outlet ends and a plu
/ rib chamber issues, said second ba?le having ori?ce means '
said outlet.
.
11. In a ,mu?ler structure including means de?nmg a
‘ and said outlet a second ba?le de?ning withther?rst men
25
rality of battles transversely across ‘the mu?ie chamber,
each of said ba?les having a marginal corrugation-like
ring rib projecting generally toward the inlet and provid
‘ingja groove‘ channel opening toward the outlet, the side
,
7.},In a muffler structure, vmeans‘providing a housing
having an inlet and an outlet and a ba?ie disposed within
walls de?ning the ribs having opposed ori?ces through
which ?uid to be mu?led from the inlet side of each of
said housing between said inlet and said outlet, said ba?ie
interrupting ?ow of ?uid from the inlet to the outlet, said
ba?ie having a ring rib thereon which projects from the _
the ba?ies passes to the outlet side thereof in jets that
collide head-on within the groove channels of the ring
inlet side of the battle and de?nes a chamber which ‘opens
toward the outlet side of the ba?le, said rib having a pair
of opposed ring walls, each of said walls having a series "
'tive to the‘ axis of the mu?le chamber.
‘35' 512. ‘In a muffler’ construction, a ba?le member. for
of ori?ces therein, the ori?ces of said walls being in re
spectively generally opposing relation to each other and
de?ning jet. streams of ?uid moving from said inlet
thorugh said ori?ces to collidehead-on insaid ‘chamber
and then move from the opening of the chamber toward
said outlet, said ring 'ribbeing disposed on amargihal ~
portion of ‘said ‘ba?ie and comprising an accordion, pleat
like fold de?ning a perimeter of. smaller ‘diameter than
said housing, the opening from. said ring rib chain er.
>
‘
disposition across the mu?le chamber of the mu?ler, said
ba?ie having “a generally axially projectingcircular cor
rugation-like rib portion having. opposed walls with op
posed generally aligned ori?ces therein through which
‘?uid to be mu?ied is sub-divided intojets that collide
head-on‘within a channel groove chamber provided, by
‘the rib portion.
13. In‘ amu?ier structure including means de?ning a
lmu?le chamber having an inlet at one end and an outlet
de?ning a month which opens towardthe axis of the
housing.
ribs, said ba?ies having means for diverting the ?uid
‘passing from the rib groove channels transversely rela~
'
8‘. in ‘a mu?ler structure, means providing a housing‘ '
‘having an inlet and an outlet‘and a ba?le disposedwithin ‘
'atthe‘ opposite "end, said chamber having ?xedly there
ac‘r'oss and in‘ spaced relation‘a plurality of ba?ie walls
de?ning therebetween expansion spaces, each of said .
walls having a corrugation-like rib projecting generally
said housing between said inlet andv said outlet, said
toward the inlet end and in each instance de?ning a nar
ba?le interrupting ?ow of ?uid from the inlet to the out 50 row channel opening toward the outlet end, said ribs
- let, said ba?le having a ring rib thereon which projects,
being de?ned by confronting walls, said walls having re
from the inlet side of the ba?jie and de?nes ‘a ‘chamber .
which opens toward the outlet side of the ba?‘le, said rib ;
spe‘c'tive jet-forming series'of ori?ces therein generally .
aligned with the jetori?ces ‘of the confronting wall in .
each instance so that ?uid to be mu?led entering the
having a pair ‘of opposed ring walls, each of said walls’ 7
having a series or" ori?ces therein, the ori?ces offsaid 55 chamber through the inlet end is forced to pass through
walls being in respectively generally opposing relation 1, said jet‘ ori?ces and provides jets of the ?uid .which col- 4
to ‘each other and de?ning jet "streams. of ?uid moving.
lide head-on with the jets from the respective opposed
from‘ said inlet through said ori?ces to collide head-on
ori?ces within the respective rib channels before moving
in said chamber and'then move ‘from the opening of the
outjot said channels into the expansion space into which
. chamber toward said outlet, said ring rib being disposed 60
the channel opens.
on a marginal portion-of said ba?le and comprising an 1.
aecordion pleat-like fold de?ninga perimeter of smaller
diameter than said housing, the opening from said ring
rib chamber de?ning a mouth‘whichr opens toward the
axis of the housing, and a tuning bell member secured
‘to the outlet sideaof said baf?e andhaving ?ange s'truc-.
ture disposed in the path of ?uid issuing from said mouth
so that such?uid will impinge againstsuch ?ange struc
ture for development of predetermined tone response. ,
9. In a muf?er structure comprising means providing. 70
' a housing with. an inlet and an outlet and a battle mem»
her disposed within and across the housing between said '
inlet and ‘said outlet, said ba?le member comprising re
'
i
'
.
'
>
References Cited in‘ the ?le of this patent‘
V
. 1,184,431
2,392,247
vIllllhll'lI‘L-il) STATES PATENTS
Dodge ____________ __l__ Mayzs, 1916
Katcher __..> __________ __'_ Ian. 1, 1946
2,444,192
Giesler ________ _l_..____‘_ June 29, 1948 ‘
2,567,568-
Lievense et al _____ .._-__;_ Sept. 11,1951
2,576,522
Ky?'in- _______ "7----.. Nov. 27, 1951
' 2,707,449
Lyon _______________ __H_ May 3, 1955
;
388,764’
470,904
‘FOREIGN PATENTS
'
France __~_r__.l.._.._'____ .. Aug. 21, 1908,
Italy -a _____ __‘_____V_>___ Apr. 29, 1952 ‘
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