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Патент USA US2510441

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June 6, 1950
c. G. VOKES
2,510,441
AIR INTAKE FILTER AND SILENCER
Filed Dec. 20, 1948
2 Sheets—$heet 1
Attorney
June 6, 1950
c, G. voKEs
2,510,441
AIR INTAKE FILTER AND SILENCER
Filed Dec. 20, 1948
2 Sheets-Sheet 2
F/GZ.
Invenlor
I
Attorney
2,510,441
Patented June 6, 1950
UNITED STATES PATENT OFFICE
2,510,441
AIR INTAKE FILTER AND SILENCER
Cecil G. Vokes, Guildford, England, assignor to
Vokes Limited, Guildford, England
Application December 20, 1948, Serial No. 66,347
In Great Britain December 29, 1947
3 Claims.
1
(Cl. 183—73)
2
vIn application Ser. No. 705,554 there is de
tains a concentric domed ba?le or re?ector 4 with
scribed an intake silencer in which the entering
air passes ?rst through a zone of high frequency
elimination, next through a low frequency
by beading 6, leaving a high frequency elimina
silencer (preferably including a resonator de
signed for the dominant sound) and ?nally
through a ?brous or other sound absorbing ?lter.
The result is that the sound waves emerging from
the engine or other intake ?rst pass through the
?lter, then the low frequency silencer and ?nally
the high frequency elimination zone where there
is an induced suction effect.
The illustrated form shows the air inlet in the
side of a cylindrical casing so that the air enters
radially between two tubes of di?erent length,
of which one is a low frequency resonator and the
other leads into a domed end cap, forming a suc
tion zone, and perhaps also a shorter resonator.
its open end facing the inlet of the tube I. The
cap 3 and a partition 5 are secured to the case 2
tion zone ‘I between the tube I and the dome 4.
Apertures 8 are provided near the inlet end of the
resonator tube I to assist in the distribution of
?ow to the ?lter element I5.
A closure cap 9 is ?tted to the outer case so that
the air turns back into the annulus between the
central tube and outer case. The closure cap 9
may be secured by a wing-nut I0 engaging a
threaded rod II carried by a cross bar or spider
I2 at the end of the tube I. Felt or like discs I3,
I4 are ?tted inside the partition at the far end
of the annulus and in the closing cap respec
tively and make joint with the ends of the tapered
star-shaped or deeply pleated ?lter unit. A re
taining clip IS with tightening screw 20 can also
It has been found in practice that better results
are obtainable in some cases by locating a domed k) C be ?tted to the outer case.
Air entering the apparatus at the inlet end of
or conical ba?le or reflector with its open end op
the cap 3 ?ows through the annular space 2|, of
substantially constant cross-sectional area, sur
rounding the dome 4, before turning inward and
helps to absorb low frequency noises issuing from
the tube. The air is admitted to the apparatus 26 entering the high frequency elimination zone ‘I
and resonator tube I. The air which has passed
at the end outside the re?ector, so that the en
into the tapered annular space I‘! inside the ele
tering air ?ows past the outside of the re?ector in
ment will emerge through the ?ltering material
an annular space preferably of substantially con—
into a reversely tapered annular space I8 outside
stant cross-sectional area and then turns inwards
into the high frequency zone and thence through 30 it and communicating with a lateral branch I9
which forms the outlet for the ?ltered air from
the low frequency resonator.
the combined ?lter and silencer to the engine
It is also found preferable to provide the aper
intake.
tures in the resonator near its inlet end, leading
posite to the inlet end of the low frequency tube,
but of greater area than the tube, so that it
directly into the zone (where the pressure is
Either tube or casing may advantageously be
slightly lower) inside the ?lter and helping in 35 tapered in some cases.
Other suitable forms of ?lter unit may be used
distribution of air over the full length of the
within the wider aspects of the invention, for
filter.
instance a brush type.
An alternative method of air flow to each end
It will be noted that the emerging sound waves
of the ?lter is to permit an aperture approxi
mately half way down the centre tube, and to 40 pass through the sound absorbing material of the
?lter before passing through the low frequency
cover the aperture with a, tube of larger diameter
chamber or resonator and then through the zone
having its open end at the front and blanked off
where exposure to a chamber in which a partial
at the rear behind the aperture. In this way the
vacuum is induced has the well-known tendency
maximum length of the acoustic tube is main
45 to level out the high frequency waves.
tained when measured in either direction.
I claim:
The silencer is in other respects like that de
1. A ?lter and silencer assembly comprising an
scribed and the present invention provides these
elongated casing closed at one end and having
improvements or modi?cations.
a substantially central opening of reduced di
A typical form is shown upon the accompany
50 mensions at the other end, an inlet end portion
ing drawings whereof:
extending axially from the latter end of said
Fig. 1 is a central longitudinal section, and
casing and having an end located inlet sub
Fig. 2 is an end view.
stantially aligned with said opening, a tubular
The combined ?lter and silencer shown has a
member longitudinally in said casing and con
main body part comprising a central resonator
nected thereto at one end in communication with
tube I and concentric outer case 2. A cap 3 con
2,510,441
3
said opening and having an outlet at the other
end that opens into said casing, said member
de?ning a low frequency silencing chamber and
cooperating with said casing to de?ne an annular
?lter chamber, a substantially cylindrical ?lter
element extending longitudinally in said casing
3. An assembly as de?ned in claim 1 wherein
said inlet end portion is slightly domed and
spaced from said domed re?ector to cooperatively
provide said annular inlet passage with a sub
stantially constant cross-sectional area to en
able an even inlet ?ow.
between the ends‘thereof and surrounding said
CECIL G. VOKES.
tubular member to divide said ?lter chamber into
REFERENCES CITED
concentric“sections,v an outlet in the‘side of said‘
casing and opening laterally from the outer of 10 ’ The following references are of record in the
the ?lter sections, and a domed re?ector con-‘-v
?le of this patent:
centrically in said inlet end portion vand-spaced
STATES PATENTS
therefrom to de?ne an annular inlet passage
therebetween, said re?ector b'e‘ingT'ispaced from
the adjacent casing end to de?ne a high free"
quency elimination zone andhavingxan opening
on its inner side opposite said casing openingiandr
of greater area than said casing opening to pro
mote a reduced pressurewithin said re?e'ctoF‘for
modifying the high frequency waves.
Z’J-LAL‘nV “ assembly‘ 'a's'de?ned‘ in ~c1ain'1_' 1 wherein?
said tubular‘ member‘; comprises:1ap'ertures"open:v
ingl‘laterally'f into said ?lter-chamber adjacent"
its'lconnection' ’ withsaid'casing;
Number‘ >
1,490,957 '
2,050,581
Name
Date
Birger ___________ __ Apr. 22, 1924
Orem ___'_ _______ __ Aug. 11, 1936
FOREIGN PATENTS
Numberv
323,881
Country
Date
Great Britain ____ __ Jan. 16, 1930
3167,0091
Great'Britain-__1__»= Feb.--10; 1932
391,180
Great Britain __-__~__- Apr; 18~,l=1933
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