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Патент USA US2131001

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Sept. 20, 1938.
_ F, E, PROCHNQW
2,131,001
MUFFLER
Filed NOV. 13, 1956
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ATTO R N EYS
2,131,001
Patented Sept. 20, 1938
L-UNrTED STATES PATENT OFFICE
2,131,001
MUFFLER
Felix E. Proclmow, Buffalo, N. Y., assignor to
Buffalo Pressed Steel Company, Buffalo,
N. Y.
Application November 13, 1936, Serial No. 110,701
16 Claims. (Cl. 181-59)
This invention relates to improvements in the muñler by means of an annular passage
muillers for use in connection with internal com
bustion engines, and more particularly to muffiers
of the type in which sounds are silenced byv de
5 structive interference.
vT_he objects of this invention are to provide a
muffler of this kind'in which the ñow passage for
the-gases through themufl‘ler is so arranged that
a resonance chamber may be arranged within
the flow passage.
Anotherobject of the inven
tion is to provide a muilier of this type in which
all of the resonance chambers of the muiiler may
be in direct communication with the flow passage
for the gases. A further object of this inven
tion is to produce a muliier of this type having
means of improved construction for supporting
a pair of shells one within another.
other object of the invention
muffler of this kind with means
struction for forming a bottle
with a 'resonance chamber. It
Still an
is to provide a
of improved con
neck connection
is also an robject
of this invention to provide improved means for
supporting a pair of shells in correct relation to
each other and to a head and simultaneously
25 forming passages for products of combustion and
other passages communicating with the reso
nance chamber to form a bottle neck type of
resonator.
Other objects of this invention will appear
30 from the following description and claims.
In the accompanying drawing:
Fig. 1 is a longitudinal central sectional eleva
tion of a portion of a muliler embodying this in
vention.
Fig. 2 is a similar view of the remaining por
tion of the muffler.
Fig. 3 is a fragmentary longitudinal section
thereof, on line 3_3, Fig. 4.
Figs. 4 and 5 are transverse sectional eleva
40 tions thereof on lines 4_4 and 5_5, Fig. 1.
Fig. 6 is a fragmentary section on line 6-6,
35
Fig. 1.
Fig. '1 is a fragmentary longitudinal section
ony line 1_1, Fig. 1.
I0 represents the outer shell of the mufller, the
45
opposite ends of which are closed by means of
formed between two shells, for example, an inter
mediate shell I8 and an inner shell I9. The
inner shell may form one or more resonance
chambers, being for this purpose provided with
baffles 20 secured within the inner shell, and
the inner shell is also provided with the usual
openings or perforations 2I of any suitable form
which may be arranged as desired to produce
within the inner shell high frequency resonance
chambers.
InY order to support the two shells between
which the annular passage for gas and sound
Waves is formed in correctrelation to other parts
of the muffler any suitable or desired construction 15
may be employed. In the construction illus
trated for this purpose, I have provided at oppo
site ends of the muffler sleeves 24 and 25 which
are provided with grooves or channels‘preferably
extending throughout the length of the sleeves. 20
If it is desired to support both the inner and
intermediate shells by means of these sleeves, the
depth of the grooves may be such that the inner
portions of the sleeves 24 and 25 bear against the
outer surface of the inner shell I9 and the outer 25
portions of the >sleeves bear against the inner
surface of the intermediate-shell I8. In this
manner, one end of each of the sleeves 24 and 25
may be inserted into the space between the inner
and intermediate shells and thus hold these 30
sleeves in correct relation to each other.- 'I'he
sleeves are thus provided with inwardly facing
channels 21 through which the gases and sound
waves may pass and which establish communica
tion between the interior of the sleeves and the
annular passage for the gases. The sleeves may
be secured to the heads of the muffler in any
suitable manner. Preferably the sleeves are also
so proportioned with relation to the shoulders
I6 of the ends of this muffler that the outer sur 40
faces of the sleeves ñt snugly-against the shoul
ders I6, and the outer ends of the sleeves 24 and
25 abut against transverse portions of the heads
II and I2. Consequently, the sleeves 24 and 25
may be readily welded to the heads II and I2 45
as'indicated, for example, at 28, Fig. 3, and the
heads II and I2 of any usual or suitable con
sleeve 24 lmay also be Welded to the inner and
struction, the heads shown being provided with
integral outwardly extending tubular portions I4
intermediate shells, as shown lat 29 and 30, Figs.
and I5 to which the exhaust and tail pipes (not
shown) may be connected in any suitable or usual
manner. The heads are preferably also each
provided with an annular shoulder I6.
In most mufllers of this type as heretofore
55 constructed, the gases and sound waves are
passed through the mutlier through the inner
conduit, and the resonance chambers arein that
case arranged about the exterior of the inner
shell. In accordance> with this invention, the
60 gases >and sound waves are conducted through
1,’3 and 5. This forms a strong and'rigid con
nection between the head II and the `adjacent 50
ends of the inner and intermediate shells. If the
muiller is of considerable length, it may be pref
erable to provide expansion and contraction of
the inner and intermediate shells relatively to
the outer shell by welding one ofthe sleeves, for
example, the` sleeve 25 to its head I2 but not to
the inner 4and intermediate shells so that a slid
ing connection between thesleeve 25 and these'
two shells is provided, as clearly shown in Fig. 2.
If desired, to facilitate assemblyv of the head I2 60
2
2,131,001
and the sleeve 25 secured thereto in correct rela
tion to the inner and intermediate shells, suita
ble spacing means, such as flanged thimbles 3I
may be provided, the fianges 32 of which may be
welded to the inner shell I9. By providing three
or more of these thimbles, the inner and inter
mediate shells will be held in properly spaced
relation to- each other so that the sleeve 25 may
readily be inserted into the annular space ne
10 tween these two shells.
The muffler is, also provided with suitable reso
nance chambers arranged about the gas passage,
and in the construction illustrated, these reso
nance chambers are provided between the outer
shell IU and the intermediate shell I8, and one
or more bafiies 34 may be provided in this space.
This baflie 34 as is customary in mulilers of this
type may be so positioned with relation to the
ends of the mutlier as to produce low frequency
20 resonance chambers of the desired length to
counteract certain Wave lengths encountered in
the particular engine which the muffler is in
tended to silence.
It is well known that the action of the reso
25 nance chambers may be greatly modified by
providing these chambers. with restricted pas
sages or channels leading to the same to form
bottle neck type of resonance chambers. This
is accomplished in the muflier illustrated by
30 means of channels 35 in the sleeves 24 and 25
the sleeves 24 and 25. The high frequency res
onance chambers in the inner shell I9 may also
be modified by the location `and number of the
perforations 2| and by the location of the baiiies
20 within this shell. By locating the passage for Ui
the gases nearer to the outer surface of the muf
fler, a more rapid dissipation of heat through
the outer shell of the muffler results.
I claim as my invention:
1. A muiiier having an inner perforate shell
having its end portions closed to form therein
an inner resonator Chamber, an intermediate
shell arranged about said inner shell and forming
therewith a passage for gases and sound waves,
an outer shell surrounding said intermediate shell
and forming therewith an outer resonator cham
ber, communicating with said passage and means
extending transversely of said outer resonator
chamber to substantially interrupt the passage of
gases therethrough.
2. A muliier having a shell forming a passage
for gases and sound waves through said muffler,
a perforate inner shell arranged within said first
mentioned shell and having an end thereof closed
and forming a resonance chamber into which
sound waves may enter through the perforations
therein, an outer shell arranged about said first
shell and forming therewith outer resonance
chambers connected with said passage,
the annular gas and sound wave conducting pas
3. A muffler having a shell forming a passage 30
for gases and sound waves through said muffler,
a perforate inner shell arranged within said first
mentioned shell, a transverse wall in said inner
shell forming a resonance chamber into which
sound waves may enter through the perforations Ul
therein, an outer shell arranged about said first
sage between the shells I8 and I9.
shell, heads closing the ends of said outer shell,
which face outwardly and by having the inter
mediate shell I8 terminate at distances from
the heads II and I2 of the muffler.
These chan
nels 35, which may be formed alternately with
35 the channels 2l', terminate at their inner ends in
The outer
ends of the channels or ducts 35 terminate in
the annular space formed between the ends of
40 the intermediate shell I8 and the adjacent heads.
In the operation of the muffler described, if
the tubular extension I4 of the head II of the
muffler is` connected with the exhaust pipe of an
engine, the exhaust enters in the sleeve 24 and
45 passes through the channels 21 therein into the
annular gas conducting passage between the
shells I8 and I9. High frequency sound waves
enter into the inner resonance chambers within
the inner shell I9 through the perforations 2l in
50 the shell and return into the annular passage out
of phase with corresponding sound waves, which
are thus silenced by destructive interference.
Low frequency sound Waves from the annular
gas passage pass through the channels 35 into
the outer resonance chambers. At the discharge
end of the mufller, the gases and sound waves pass
through the channels 2li~ of the sleeve 25 into
the interior of this sleeve beyond the end of the
inner shell I9, and are discharged through the
tubular extension I5.
It will be noted that by means of this con
struction, low frequency sound waves pass directly from the annular gas conducting space
into the bottle necks or passages 35 of the low
65 frequency resonance chambers, thus eliminating
the need for intermediate chambers heretofore
required to transmit low frequency sound Waves
from the inner shell to the bottle necks. In
adapting mufilers of this kind to eliminate par
70 ticular sound waves of an engine, it is possible
not only to change the position of the baffle 34 to
.adapt the outer resonance chamber to the silenc
ing of the sound waves encountered in the en
gine but the bottle necks formed by the passages
75 35 can also be varied by varying the lengths of
said first shell and said outer shell forming be
tween them an outer resonance chamber, and
means for spacing said first and inner shells
relatively to each other .and forming elongated
channels of smaller cross sectional area than said
outer resonance chamber and connecting said
outer resonance chamber with said passage.
4. A muflier having a shell forming a passage
for gases and sound waves through said muffler,
an inner shell arranged within said first men
tioned shell, a transverse wall in said inner shell
forming high frequency resonance chambers
communicating with said passage, and an outer
shell arranged about said first shell and forming
therewith a low frequency resonance chamber
communicating with said passage.
5, A muffler“ having a shell forming a passage
for gases, a second shell arranged within said
first shell, a plurality of transverse baflies within
said second shell and dividing said second shell
into a plurality of resonance chambers, said sec
ond shell also having openings which establish
communication between said passage and said 60
chambers and through which sound waves may
pass.
6, A muffier having a shell forming a passage
for gases, a second shell arranged within said
first shell and having a plurality of transverse
baflies dividing said second shell into a plurality
of resonance chambers, said second shell also
having openings which establish communication
between said passage and said chambers and
through which sound waves may pass, and an 70
outer shell arranged about said first shell and
forming therewith a chamber which communi
cates with the interior of said ñrst shell.
'7. A muffler having a shell through which gases
may pass, a second shell arranged within said 75
3
2,131,001
Ul
first shell and Ihaving a plurality of transverse
bailles dividing said second shell into a plurality
of resonance chambers, said second shell also
shell, and a sleeve secured at one end to one of
having openings which establish I,communication
said heads and arranged in spaced relation to
between said passage and said chambers and
through which sound waves may pass, an outer
the intermediate shell and forming therewith a
bottle neck passage connecting the space between
said inner and intermediate shells with the space
between said intermediate and outer shells.
13. A mufller having inner, outer and inter
mediate shells arranged one within another, the
inner of said shells being perforate, means for
shell arranged about said ñrst shell and forming
therewith a chamber which communicates with
the interior of said first shell, and a sheet metal
10 member arranged between said first and second
shells and having a channel extending from the
interior of said first shell to said chamber be
tween said first and outer shells to form a bottle
neck therefor.
8. A muffler having a shell forming a passage
for gases and sound waves, a perforate shell
arranged within said first shell and divided into
a plurality of chambers into which sound waves
may enter from said passage through the per
20 forations of the inner shell, an outer shell ar
15
ranged about said first shell and forming there
with a resonance chamber, and a channel-shaped
member arranged between said second shell and
said first shell for forming a bottle neck for said
25 resonance chamber and communicating at one
end thereof with said chamber and at the other
end with the passage within said first shell.
9. A muffler having a. shell forming a passage
for gases and sound waves, a shell arranged with
30 in said first shell and forming therewitha passage
dividing said inner shell into a series of resonance
chambers, heads closing the ends of said outer
c)
dividing said inner shell into a series 0f reso
nance chambers, heads closing the ends of said
outer shell, and a sleeve secured at one end to
one of said heads and supporting said inner and 15
intermediate shells in fixed relation to said head,
said sleeve having portions thereof spaced from
said intermediate shell to form therewith bottle
neck channels connecting the space between said
intermediate and outer shells with the space 20
within said intermediate shell.
14. A muffler having inner, intermediate and
outer shells arranged one within the other, said
inner and intermediate shells being spaced from
each other to formv between them a passage for 25
gases and sound waves, and said inner shell being
perforate, means for dividing said inner shell
into resonance chambers communicating with
said passage, heads closing the ends of said
outer shell, and a sleeve formed into a series of
for gases and sound waves, said inner shell com
inwardly and outwardly facing and longitudinally
municating with said passage to destroy sounds
in said passage by destructive interference, an
outer shell arranged about said first shell and
forming therewith a resonance chamber, and
means cooperating with said flrst shell and form
ing therewith an elongated channel of mate
rially less cross sectional area than said resonance
chamber and connecting said passage with said
extending channels and secured at one end to
one of said heads and terminating at its other
end in the space between said inner and inter
mediate shells, the inwardly facing channels ol' 35
said sleeve serving to conduct gases and sound
waves from the interior of said sleeve to said
passage, and the outwardly facing channels form
ing bottle necks connecting said passage with a
40 resonance chamber to form a bottle neck reso
nance chamber.
resonance chamber formed between said outer i
10. A mufller including a pair of shells ar
ranged one within the other and forming between
them a passage for gases and sound waves, the
45 inner of said shells being perforate, means for
dividing said inner shell into a series of reso
15. A muñler having inner, outer and inter
mediate shells, the inner shell being arranged
within said intermediate shell and the intermedi
ate shell being arranged within said outer shell,
heads at the opposite ends of said outer shell,
nance chambers into which sound waves may
means spacing said inner and intermediate shells
from each other and from said heads, to form a
passage through said mufller from one head to the
other in the space between said intermediate and
enter through the perforations of said inner shell,
a sleeve extending between said shells and pro
50 vided with a series of longitudinally extending
grooves which form channels connecting the in
terior of said sleeve with the space between said
shells.
11. A mulller having inner, outer and inter
55 mediate shells arranged one within another, the
inner of said shells being perforate, means for
dividing said inner shell into a series of reso
nance chambers, and a sleeve extending between
said inner and intermediate shells and provided
60 with longitudinally extending inwardly and out
wardly facing channels, the inwardly facing chan
nels conducting gases and sound waves from the
interior of said sleeve into the space between said
inner and intermediate shells, and the outwardly
65 facing channels forming bottle necks communi
cating with the space between said inner and
intermediate shells and with the space between
said intermediate and outer shells to form with
said last mentioned space a bottle neck resonator.
70
12. A muffler having inner, outer and inter
mediate shells arranged one within another, the
inner of said shells being perforate,l means for
and intermediate shells.
inner shells, said inner shell having baflles there
in forming a chamber in said inner shell and
having perforations through which sound waves
from said passage may enter said chamber, the
space between said intermediate and outer shells
also communicating with said passage and form
ing resonance chambers.
16. A muñler having inner, intermediate and
outer shells, the inner shell being arranged within
said intermediate shell and the intermediate shell
being arranged within said outer shell, means
cooperating with said shells to form a passage for
gases and sound Waves between said inner and
intermediate shells, means extending transverse
ly of said inner shell for forming within said 65
inner shell a resonator chamber communicating
with said passage, and transversely extending
means for forming a resonator chamber between
said intermediate and outer shells and communi
cating with said passage.
FELIX E. PROCHNOW.
70
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