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Патент USA US2045142

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June 23, 1936;
Filed Sept. 5, 1933
m V E N. T O R
Patented June- 23, 1936
Erwin C. Horton, Hamburg, N. Y., assignor to
Trlco Products Corporation, Buffalo, N. Y.
Application September 5. 1933. Serial No. 688,219
5Claims. (Cl. 181-44)
This invention relates to motor vehicles and tional views taken respectively through portions
internal combustion engines and particularly to
an apparatus having the combined e?ect of
mu?ling the exhaust from the vehicle, or internal
5 combustion engine, and of providing a source of
suction or less than atmospheric pressurefor
operating pumps, horns, windshield cleaners, or
of the apparatus which appear in elevation in
Fig. 1.
As shown in Fig. 1, the apparatus includes a cas
ing comprising an elongated tubular member II,
other devices such as those which may be asso
a closure member I2 for one end of member II
and provided with a nipple I3 for attachment to a
conduit I4 extending and connected to the engine
ciated with the vehicle or engine.
exhaust passage or exhaust manifold, and a 010- _
10' In general the present invention contemplates,
in apparatus wherein the ?ow of gases expelled
sure member I5 for the opposite end of tubular 10
member II. Closure member I5 has an opening
I6 which may open directly into the atmosphere,
from the engine through a mu?‘ling zone is caused
to create a zone of sub-atmospheric pressure for
or, as illustrated, may be provided with a nipple
ll for connection to a conduit I8 leading to the
the purposes indicated above orotherwise, the
provision of means for eliminating excessive back
pressures in the engine exhaust passage, such
means including an automatic control mechanism
adapted to function under the varying conditions
secured to the walls‘ of member II, is a wall I9
of engine operation. For example, when the en
gine is operating at low speed or under light load,
the contemplated means will be automatically ad
justed to utilize the kinetic energy of a large por-_
tion of the flowing exhaust gases for the produc
having opening 2i in substantial alignment with
nipple I3, and having plural perforations 22 for
passing ?uid from the inlet opening (nipple I3)
side of wall 59, designated inlet chamber 20, to
pheric pressure; and when the engine is operating
at high speed or under great load and is exhaust
ing relatively large quantities of gases, such as
I5 serves with the latter and member I I to formv
outlet chamber 25. Wall 24 has an opening 26
aligned with opening 2| in wall I9, and also has
an opening 21 in substantial alignment with aper
tures 22 of wall I9.
A Venturi tube connects chambers 20 and 25,
and comprises a tubular member 28 secured to
wall I9 over opening 2I and a second tubular
would tend to create excessive “back pressure” or
pressure between the engine and the suction pro
30 ducing apparatus and also create an excessive
degree of suction, the means contemplated will
automatically e?ect a by-passage of a considera
ble portion of the exhaust gases into the atmose
phere, to thereby maintain the suction and back
35 pressure at substantially constant degrees.
member, 29, secured to wall 24 and’ extending
through opening 26 thereof into chamber 25.
Tube 28 is relatively wide at its inlet end (the end 35
secured to wall I9) , and has its walls converging
means for governing the automatic control are
constructed and arranged in such manner as to
be unaffected by the heat of the exhaust gases,
toward the opposite end to provide restricted
throat 3I. Tube 29, connecting throat 3| has
walls diverging toward closure I5, in such manner.
that the Venturi tube is of constantly increasing
which heat may vary in temperature and quantity
40 in accordance with operating conditions of the
engine, such as load, speed and other factors.
_ I diameter from throat 3| to the terminal portion
in chamber 25.
These and other objects and advantages, in
cluding those inherent in the various features of
arrangement and formation of parts, will become
45 apparent from the following description of the
one typical embodiment of the invention that
is illustrated in the accompanying drawing,
Fig. 1 is a longitudinal section through the
Fig. 3 is a transverse section, being taken sub
stantially along line 3—-3 of Fig. 1; and
Figs. 4 and 5 are fragmentary longitudinal see
The :terminal portion 32 of the
inlet end of tube 29 is belled and contacts with a
medial portion of tube 28 to de?ne an annular"
chamber 33 about throat iii, the walls of which
have pluralopenings 34 into chamber 33. Se
cured to wall portion 32 of chamber_33 and to tube
ll is a nipple 35 adapted for connection to ya.
suction conduit 36 which may extend to a horn,
Fig. 2 is a transverse section, being taken sub
stantially along line 2-2 of Fig. 1;
the other side of the wall, designated chamber 23.
Another transverse Wall, 24, spaced from closure
tion and maintenance of the zone of sub-atmos
Extending transversely of and within tube II,
in spaced relation to closure I2, and preferably
pump, windshield cleaner, or other device operable .
by or utilizing sub-atmospheric pressure.
Secured to Wall 24 over opening 21 is one end
of tubular member 31 which extends into cham
ber 25. rifhe walls of chamber 31 have perfora
tions or apertures 38 and the end'39 thereof is
adjacent to ?anged plate 4|. Con?ned between
wall 24 and plate 4! is a helical or coiled spring
42, the convolutions of which are closed or in
contact when plate 4! is positioned adjacent tube
end 39. The ends of the spring are respectively
secured to wall 24 and theplate, so that when the
latter is moved away from tube and 35, the convo
lutions of the spring will be separated, thereby
providing an opening between chambers 23 and
25, via tube 31, perforations 38 and the‘ interstices
between the spring convolutions.
Closure plate 4i is carried for movement to
ward and from tube end 39 by a rod 43 which ex
tends axially through the perforated tube,
15 through a guiding opening in wall I9, and through
a bearing plug 44, the-latter being seated in an
aperture in closure l2. The forward end, 46, of
the rod is connected to one end of a coiled spring
41, the opposite end of the spring being attached
to member 48 which is threaded to, and hence is
adjustable longitudinally of, a' tube 49 which pro
‘ jects forwardly from the casing over the plug 43.
In operation, when the engine is operating at
relatively low speeds or under light loads, so that
25 the quantity of exhaust gases is small, the gases
will pass from conduit i4, through chamber 20,
through the venturi sections 23 and 29 into cham
ber 25, and thence to the atmosphere via dis
charge opening i6. Due to the small quantity’of
30 ?uid passing the apparatus, the restriction pro
vided by Venturi throat 32 will be insumcient to
cause pressure to build up in chamber 20 in such
excessive degree as to appreciably impede engine
operation.’ Accordingly, since a small pressure
(above atmospheric pressure) is effective in cham
bers 20 and 23, the closure 4! will be held seated
by spring 41 and hence no ?uid will pass from
chambers 20 or 23 into chamber 25 except through
the venturi. The term "seated” has reference
40 to closed position of convolutions of spring 42
since it is not essential that closure 4! actually
contact ‘tube 31.
Fluid passing through the Venturi tube will
move at maximum velocity through the throat 3 I ,
45 thereby having static pressure at this point of
considerably less than atmospheric. Hence ?uid
will be withdrawn from annular chamber 33
through apertures 84, all in accordance with the
well known “Venturi" action, so that chamber 33
50 will be a zone of ?uid undersubatmospheric pres
sure, and ?uid will flowv into same through the
‘conduit 36 to withdraw air or other ?uid from
the device to which the conduit is attached.
As engine ‘speed or load is increased, with re
sultant increase in the quantity of exhaust gases,
excessive pressures would tend to develop in cham
bers 2|] and 23. However, upon the initiation of
any such increase of pressure, the closure 4i
60 will be unseated to spread the convolutions of
spring 42, and thereby provide a by-passage about
the Venturi tube from chamber 20 to chamber
25, via apertures 22 in wall i9, chamber 23, aper
through the venturi and the degree of suction in
chamber 33.
‘The spring 42 will be necessarily somewhat re
silient, and may be designed so as to tend to either
open or close under its own resiliency. It is pre
ferred, however, that spring 42 be subservient in
its action to the spring 48, which is position d
out of the path of the exhaust gases and hence
will not be subject I: \ such excessive temperatures
as might destroy its temper. By this arrangement
the device will function in like manner whether
‘the gases be cool or excessively hot. The tension
of spring 48 may be varied, to vary the degree of
suction or the maximum pressure in chamber 20,
by adjusting the threaded spring retainer 48.
The mui’iling action of the device is effected by
expansion of gases in the venturi tube and by the
breaking up and expansion of gases in passing the
apertures 22, 38 and the interstices between the
convolutions of spring 42. It will be understood 20
that other mu?ling instrumcntalities may be add
ed to the device if desired.
When the engine is operating, the ?ow gases
entering the mu?ier will be of pulsating charac
ter, the number of pulsations per unit of time de 25
pending, of course, on the number of engine cylin
ders and engine speed. The resultant periodic
increase and decrease in the volume and pressure
of gases entering the mu?ler will cause the valve
means 4H, 42 to-periodically open and close. It
has been found that at high engine speeds, where
the periods of pulsation are very rapid and of
short duration, the inertia of the valve means
will prevent complete closing at: each pulsation,
and that the valve will have relatively small
movement, although su?icient. to produce an ap
preciable mu?ling action. At low engine speeds,
without the Venturi means, the valve means 4!,
42 would tend to open and close with each pulse.
tion of the exhaust gases, which action is at
tended with more or less noise and wear upon the
‘ However, as illustrated in Fig, 1, the constrict
ed throat 3| of the venturi is of diameter approx
imately one fourth that of the exhaust conduit 45
l4, and ' due to the sub-atmospheric pressure
maintaining in the throat, it hasbeen found that
the ?ow capacity of the venturi is approximate
ly four times that of a straight tube of like di
ameter. Therefore, with the relative proportions 50
illustrated, the Venturi tube can pass about one
fourth of the maximum total volume of ?uid
entering from conduit I4, without unduly in
creasing the engine back pressure. According
ly, when the engine is operating at relatively 55
low speeds, the venturi will accommodate a large
portion, if not all, of the gases entering the muf
?er during each pulsation, and thus modify the
extent of the pulsations which would otherwise
impinge upon the valve means 4|, 42. In this 60
manner the muilling effect of the device is greatly
It will be understood, however, that the pro
tured tube 31 and the interstices between the
convolutions of spring 42.
The volumetric ?ow capacity of the by-pass will
portions indicated above should .be varied in ac
increase as the volume of exhaust gases per unit
in the mu?ler, so that, at such speeds of the en
gine as would enable the valve means 4|, 42
of time increases, since the convolutions of spring
42 will open in proportion to pressure increase
70 in chambers 20 and ‘23. Hence, when the engine
is operating at high speed and under heavy load,
a greater portion of the exhaust gases may pass
through the by-passa-ge than through the Venturi
tube, and, accordingly, the automatic control thus
75 provided will tend to stabilize the ?ow of gases
cordance with variations in the type of engine,
engine speed, and the inertia of the valve means
to substantially close between exhaust gas pul
sations, the venturi will have su?icient capacity
to pass substantially the entire quantity of gases
exhausted from the engine.
It will be understood further that the device
herein illustrated and described is merely one
typical embodiment‘ of the inventive principles 75
involved, which may be embodied in devices hav
ing other structural characteristics, without de
parting from the scope of this invention.
What is claimedtis:
1. In a muiiler, a casing having opposite end
walls with an inlet port and an outlet port re
spectively, wall means separating the casing in
terior into an inlet chamber adjacent the inlet
port and an outlet chamber adjacent the out
10 let port, said wall means having an opening
therethrough, valve means for normally closing
said opening, said valve means including a rod
extending through the end wall having the'inlet
port and through said opening and being mov
15 able toward the end wall having the outlet port
upon opening of the valve means, resilient means
toward and away from the tube, a helical mem
ber overlying said tube and having one end se
cured to said wall and the other end secured to
said plate, the helical member being ?exible
whereby the convolutions thereof may be disposed
close together or may be separated to admit of
the passage of ?uid therebetween, a rod extend- ‘
ing through one end wall of said casing and having one end secured to said plate, resilient means
disposed outside of the casing exerting pressure
upon the rod. for urging the plate to a position
wherein the convolutions of the helical member
are close together, and means for varying the
pressure exerted upon the rod by the resilient
4. A muii‘ler comprising a casing having a pair
disposed outside of said casing for exerting a of branch passages for exhaust gases, one of said
valve closing pressure upon said rod, and means passages being a tube within the casing and hav-.
for varying such pressure of said resilient means. ing a ?xed ori?ce of restricted area, and the
other passage being defined by said tube and
2. In a mu?ler, a casing having inlet and out
let chambers respectively having an inlet and the casing walls and being yieldably closed by
an outlet port, a wall between said chambers _ valve means, said valve means comprising a coil
having an opening, a tube secured to the wall of wire so formed that adjacent convolutions
over said opening and having the secured end thereof will close against each other to restrict '
25 thereof communicating with the inlet chamber
?uid passage therebetween or open away from
each other to facilitate such ?uid passage, re
and having apertures in the walls thereof open
ing into said outlet chamber, a plate adjacent silient means for urging said adjacent convo
lutions to close against each other, and ?uid
the other end of said tube mounted for move
ment toward and away from the tube, a helical pressure actuated means for urging the convo
30 member overlying said tube‘ and having one end
lutions to open away from each other.
5. In a mu?ier, a casing having an inlet open
secured to said wall and the other end secured
ing adjacent one end thereof and an outlet open
to said plate, the helical member being ?exi
ble whereby the convolutions thereof may be ing adjacent the opposite end thereof, a perio
disposed close together or may be separated to rated wall adjacent the inlet end and a second
35 admit of the passage of ?uid therebetween, a
wall adjacent the outlet end, a vcnturi tube with 35
a suction take-off at the restricted portion there
rod extending through one end wall of said cas
ing and having one end secured to said plate, of, said tube extending within said casing be-‘
tween said walls and having its inlet end open
and resilient means disposed outside of the cas
ing exerting pressure upon the rod for urging ing into the chamber between the ?rst mentioned
wall and the casing end having the inlet open 40
- the plate to a position wherein the convolutions
ing and in alignment with the latter, and said
of the helical member are close together.
tube discharging into the chamber between said '
3. In a mu?ier, a casing having inlet and out
let chambers respectively having an inlet and an second wall and the casing end having the out
let opening, and a pressure responsive valve in
outlet port, a wall between said chambers hav
45 ing an opening, a tube secured to the wall over the second wall for opening when the pressure 45
in the last mentioned chamber is less by a pre
said opening and having the secured end there
of communicating with the inlet‘ chamber and determined degree than the pressure in the
having apertures in the walls thereof opening
into said outlet chamber, a plate adjacent the
50 other end of said tube mounted for movement
chamber between said walls.
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