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Патент USA US2403699

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‘July 9, 1946-_
'
.- E. E. WILSON
-
2,403,699
RESONATOR SILENCER
Original Filed Dec. 12,‘ 1936,
w
Zinoentor
' 51226152’ 512175012
2,403,699
Patented July 9, 1,946
UNITED STATES PATENT OFFICE?
_ General Motors Corporation, Detroit, Mich., a
' corporation of Delaware
,
~
Original application December 12,1936, Serial No.“
115,470.
' ,. 2 a
Divided and this ‘application August
30, 1940, Serial No.v354,877
-
~
.
2 Claims. _ (01. 181-48)
1
,
To attenuate the objectionable sound waves
~which occur in the intake and exhaust systems of
internal combustion engines, resonator silencers,
such as, those disclosed in my prior applications
Serial Nos. 470,700and 633,265 which were ?led
on July 25,1930, and September 15, 1932, respec
tively, are now commonly used.
However, be
~
2
>
Each of the silencers shown in Figures 1 to 5
includes a cylindrical shell "with beads ‘H and
12 secured over' its ends and a duct through
which gases may pass through the silencer. The
"duct is coaxial with the shell 10 and'consists of
tWo tubes of which one extends into ‘and is suf
?ciently smaller-than the other that the over
lapping portions of the tubes are separated by
cause the natural' frequencies of the resonators
an annular aperture. One of the tubes is se
incorporated in these silencers are ?xed and ob
jectionable sound waves of di?erent frequencies 10 cured in each of the heads ‘II and 12. The shell
10, its heads ‘H and ‘I2 and the tubes de?ne a
may occur in the intake or exhaust system of an
compartment which communicates with the duct
de?ned by the tubes through the aperture be
tween
the overlapping portions of the tubes.
itis frequently necessary, in order to attenuate
Within the compartment de?ned by the shell
all of the objectionable sound waves which occur 15
10, its heads 1| and 12 and the’ tubes 80 and 8|
inythe intake or exhaust system of an internal
internal combustion engine when it is operat
ing at'di?erent speeds but‘not simultaneously,
combustion engine, to provide in it one or more
which de?ne the duct of the silencer shown in
Figure 1, there is disposed a false head 82 which
encircles the tube BI and may be shifted length
vengine is operating at some speed or speeds and
anotheror other resonators which are operative 20 wise of the silencer. On the inner and outer
edges of the false head 82, there are formed
only when the engine is operating at another
annular ?anges 83 and 84 which ?t snugly around
speed or other speeds.
the tube 8| and Within the shell 10, respectively.
: The principal object of this invention is to
To shift the false head 82, there is provided a
‘provide resonator silencers in'which it is not nec
essary,>in order to attenuate all of the objection 25 rod 85 which extends through a guide in the head
‘resonators which are operative only when the
able sound waves which occur in the intake or
exhaust system of the engine to which the silencer
is to be applied, to provide in the silencer any
12 and Whose inner end is secured to the false
head.
‘
The compartment de?ned by the shell 19, its
head ‘ii, the false head 82 and the tubes 86 and
resonators which are not operative simultaneous
"ly'and thus to-minimize the number of resonators 30 8| constitutes the chamber and the annular aper
in the silencer.
.
ture 86 between the tubes 89 and 8| the neck of
a simple resonator. The acoustical conductivity
of the neck is, of course, ?xed but the, volume
"the silencer a resonator whose natural frequency
of the chamber and, thus, the natural frequency
"may be varied. To render the natural frequency
of' the resonator variable, the acoustical con 35 of the resonator, may be varied by shifting the
false head 82.
ductivity of its neck or necks or any of them
The compartment de?ned by the shell 10, its
and/or the voliune of its chamber or chambers
heads 'II and 12 and the tubes 90 and 9| which
vor any of them may be made adjustable. This
de?ne the duct of the silencer shown in Figure 2
‘application, however, is concerned only with cer
tain expedients disclosed but not claimed in my 40 is divided lengthwise into two chambers 92 and
93 by an annular partition 94 which encircles
application Serial No. 115,470, ?led December 12,
the tube 9| and is secured to itand the shell.
1936, which has matured into Patent No.
V This object may be attained by providing in
Through the partition 94, there extends a tube
2,214,894, dated September 1'7, 1940, of which
which consists of two partly telescoped tubular
this application is a division, by which the nat
ural frequency of the resonator may be rendered 45 elements 95 and 96 and interconnects the cham
bers 92 and 93. The tubular element 95 is se
variable.
cured in the partition 94 and the tubular element
-' - For a better understanding of the objects and
95 may be shifted lengthwise'of the tubular ele
nature of this invention, reference is made to
ment 95 to Vary the effective length of the tube
the following speci?cation in which there are de
scribed the embodiments of my invention which 50 95—96. To shift the tubular element 96, there
is provided a rod 91 which extends through a
are illustrated in the accompanying drawing.
guide in the head 12 and whose inner end is
jln the accompanying drawing:
'
secured to the tubular element 96.
Figures 1 to _5 are longitudinal sections through
The chambers 92 and‘93 constitute the cham
resonator silencers in accordance with this in 65 bers
and the tube 95-46 and the annular aper
vention.
3
2,403,699
ture 98 between the tubes 90 and 9| the necks
of a compound resonator. The volumes of the
chambers and the acoustical conductivity of the
neck 98 are, of course, ?xed but the acoustical
conductivity of the neck 95-96 and, thus, the
natural frequencies of the resonator, may be
varied by shifting the tubular element 96.
Within the compartment de?ned by the shell
and the tubes I30—I3I and I32 is divided length
wise into three chambers I31, I38 and I39 by
annular partitions I40 and I M which encircle
the tubular element I30 and are secured to it
and the shell. The partition I40 is imperforate
but there is secured in the partition I4I a tube
I 42 which connects the chamber I38 with the
chamber I39 which communicates with the an
10, its heads H and 12 and the tubes I00 and
nular aperture I 43 between the tubes I30—I3I
IOI which de?ne the duct of the silencer shown 10 and I32 through ori?ces I 44 in the tubular ele
in Figure 3, there is disposed a partition I02
ment I30 which may be partially or wholly cov
which encircles the tube IOI and may be shifted
ered by the ?ange I35 on the false head I33.
lengthwise of the silencer. On the inner and ‘ The tubular element I3I of the tube I30-I3I,
outer edges of the partition I02, there are formed
whose outer end is of smaller diameter than its
annular ?anges I03 and I04 which ?t snugly 15 inner end but of considerably larger diameter
around the tube IOI and within the shell 10,
than the tube I 32, extends beyond the tubular
respectively. The partition I02 divides the com
element I 30 and may be shifted lengthwise of
partment de?ned by the shell 10, its heads and
the silencer to vary the overlap between the
the tubes I00 and NH into two chambers I05 and
tubes I30—I3I and I32. To shift the tubular
I06 which are interconnected by a tube I01
element I3I, there is provided a rod I45 which
which extends through the partition. To ‘shift
extends through guides in the head H, the false
the partition I02, there is provided a rod I08
head I33 and the partitions I40 and MI and
which extends through a guide in the head 12
whose inner end is secured to the tubular ele
and whose inner end is secured to the partition.
ment I3I.
The chambers I05 and I06 constitute the cham 25
The chambers I38, I39 and I3‘! constitute the
bers and the tube I01 and the annular aperture
chambers and the tube I 42, the orifices I44 and
I09 between the tubes I00 and IOI the neck of
a compound resonator. The acoustical conduc
tivities of the necks are, of course, ?xed but the
volumes of the chambers and, thus, the natural
frequencies of the resonator, may be varied by
shifting the partition I02.
The compartment de?ned by the shell 10, its
heads TI and 12 and the tubes I2I and I22 which
the annular aperture I43 the necks of a com
pound and simple resonator. The volumes of the
chambers I38 and I 31 and the acoustical con
ductivity of the neck I42 are, of course, ?xed
but the volume of the chamber I39 and/or the
acoustical conductivities of the necks I44 and
I 43 and, thus, one or more of the natural fre
quencies of the resonator, may be varied by
de?ne the duct of the silencer shown in Figure 4
is divided lengthwise into two chambers I23 and
I24 by an annular partition I25 which encircles
35 shifting the false head I33 and/or the tubular
and I24. Through the head 12, there extends into
de?ne their ducts connected to the air intake
tube of the carburetor so that the air which
enters the carburetor and cylinders of the engine
?ows through their ducts in the directions indi
cated by the arrows in the drawing. But any
of the units shown in Figures 1 to .5 may be
incorporated in an internal combustion engine
exhaust silencer in which event its duct will, of
element I3I.
The silencers shown in Figures 1 to 5 were
the smaller of the tubes and is secured to it and
designed for installation on an internal combus
the shell. In the partition I25, there is secured a
tion engine with the outer ends of the larger of
tube I26 which interconnuects the chambers I23 40 the tubes (80, 90, I00, I2I and I30-—-I3I) which
the chamber I24 a tube I21 which terminates near
the lower side of the shell 10 and through which
a liquid may be introduced into or withdrawn
from the chamber I24.
The chambers I23 and I24 constitute the
chambers and the tube I25 and the annularaper
ture I28 between the tubes I2I and I22 the necks
of a compound resonator. The acoustical con
ductivities of the necks and the volume of the
course, be so disposed so that the exhaust gases
of the engine will pass through it in the same
chamber I23 are, of course, ?xed but the effec
direction as air passes through it when it is
tive volume of the chamber I24 and, thus, the
employed as an intake silencer.
natural frequencies of the resonator, may be
In whichever manner the units shown in
varied by introducing liquid into or withdraw
Figures 1 to 5 are to be installed the resonators
ing liquid from the chamber I 24 through the ' will, of course, be so proportioned and dimen
tube I21.
sioned that when their adjustable elements are
The larger of the tubes which de?ne the duct
in one position they will respond to and attenuate
of the silencer shown in Figure 5 consists of two
by resonance objectionable sound waves of one
partly telescoped tubular elements I30 and I3I
or more frequencies which occur in the intake Or
of which the former is secured in the head TI
exhaust system of the engine on which the units
and extends well beyond the inner end of and
are to be installed while the engine is operating
encircles the smaller of the tubes (I32) . Within
at some speed or speeds and when their
the compartment de?ned by the shell 10, its heads
adjustable elements are in another position or
‘II and 12 and the tubes I30—I3I and I32, there‘
other positions they will respond to and atten
is disposed a false head I33 which encircles the 65 uate by resonance objectionable sound waves of
tubular element I30 and may be shifted length
another frequency or other frequencies which
wise of the silencer. To shift the false head
occur in the intake or exhaust system ‘of the
I33, there is provided a rod I34 which extends
engine while it is operating at another speed or
through the head H and whose inner end is
other speeds.
secured to the false head. On the inner and '
To vary the natural frequencies of the units
outer edges of the false head, there are formed
shown in Figures 1 to 3 and 5 the rods (85, 91,
annular ?anges I35 and I36 which ?t snugly
I08, I34 and I45) may be actuated manually
around the tubular element I 30 and within the
and/0r automatically to shift the adjustable
shell 10, respectively. The compartment de?ned ' elements of the units in accordance with the
by the shell 10, its head 12, the false head I33
vrequirements. The rods I34 and I45 of thei‘unit
2,403,699
6
5
1. In a silencer, a duct which includes a
shown in Figure 5 may be actuated synchron
smaller tube and a larger tube which encircles
ously or nonsynchronously by the same or dif
and is radially spaced from a portion of the
ferent instrumentalities. The liquid employed
smaller tube, a shell which encircles and. is
to vary the e?ective volume of the chamber I24
radially spaced from a portion of the duct, and
of the unit shown in Figure 4 may be obtained
walls which extend from the tubes to the shell
from the cooling system or the lubricating system
and with the duct and the shell ‘de?ne a
of the engine on which the unit is installed or
compartment which encircles the duct and com
from a supply provided especially for the purpose.
municates with it as a side branch through the
Any suitable means actuated manually and/0r
automatically may be provided to introduce and 10 aperture between the telescoped portions of the
tubes, the wall which extends from the larger
withdraw and control the introduction and
tube to the shell being adjustable lengthWise of
withdrawal of the liquid from the chamber I24 i
accordance with the requirements.
~
Examples of the instrumentalities that may be
employed to vary the natural frequencies of the
units shown in Figures 1 to 5 are disclosed in
my Patent No. 2,214,894 previously referred to.
It will, of course, be understood that although
I_have described and illustrated my invention
the duct.
'
,
2. In a silencer, a shell, and a duct which
extends through the shell and with it defines a
compartment which encircles the duct, the duct
including a larger tube and a smaller tube which
extends into and is radially spaced from the
larger tube to de?ne with item aperture through
applied to the intake and exhaust system of 20 which the compartment communicates with the
duct, the larger tube being of smaller diameter
internal combustion engines, it is also applicable
to other devices in which objectionable sound
at the end into which the smaller tube extends
than at a distance from the mentioned end.
waves of different frequencies occur under
different conditions.
ERNEST E. WILSON.
I claim:
25
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