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Патент USA US2114548

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April 19, 1938.
R, w, STADLMAN
2,114,548
CARBURETOR ATTACHMENT
Filed Feb. 25, 1935
ATTORNEY.
Patented Apr. 19, 1938
' 2,114,548
_
2,114,548
.oAnnURE'ron ATTACHMENT .
Roger, W. Stadlman, 1.0a Angeles, Calif.
Application February 25. 1935, Serial No. 8,035
4 Claims. (Cl. 123-119)
This invention relates to carburetion and more
-particularly to forming a combustible mixture
for an internal combustion engine; and has for
its object to properly proportion and mix the air
5 and fuel under varying conditions‘ of loadjv and
speed.
i
More particularly it is an object of the inven
tion to increase the jet action at the fuel nozzle
01' the carburetor which forms the combustible
mixture, so as to generate a dry gas, and pref
er'ably to increase the jet action as the throttle
is opened.
.
It is a further object of the invention to in
crease the pressure of the air which at the Ven
15 turl tube of the carburetor entrains and then'
ntomizes and vaporizes the fuel, and to prefer
ably ‘increase the air pressure as the throttle is
opened;
v
.
iliurther objects of the invention will be read
20 ily understood from the following description of
the accompanying drawing, in which:
Fig. l is a side elevation of the invention, with
the throttle in idling position. ,
Fig. 2 is a transverse section on the'line t-Ji
oi’
l, with the throttle in full open position.
Fig. 3 is an axial section on the line ii-t of
‘The invention is applicable tov a usual carbu
retor for an internal combustion engine, the car;
Elli huretor including fuel nozzle i supplied from a
heat chamber 2 and having an air intake from
‘whence the air ?ows through a Venturi tube 4i
which surrounds the fuel nozzle. As shown at
l the fuel nozzle preferably opens into the
bit li'entm'i tube in the direction of flow through the
Venturi tube, and the discharge ori?ce of the
fuel nozzle is preferably at or adjacent the mari
nlum cross-sectional restriction of the Venturi
tube. A combustible mixture is thus formed in
usual manner and is drawn through the intake
manifold b? and past the throttle valve t'into
the engine cylinders, the exhaust manifold for
the engine cylinders being shown at ‘l.
The present invention preferably provides ad
ditional ?ow into the. intake manifold it as the
throttle it is opened; and this additional flow is
under considerable pressure and creates turbu
lence in the intake-manifold as well as reducing
the vacuum therein, and is preferably also adapt
ed to raise the temperature or’ the combustible
mixture and to supply exhaust gases thereto.
For this purpose a housing it) may be mounted
in the intake manifold b’, preferably between its
usual coupling ?anges iii-i2, the housing being
held in place by the usual ?ange bolts it. The
housing has a bore M in alinement with and
slightly larger than the bore of the intake mani
fold, and a sleeve I5 is mounted in this bore and
isheld in place between the ?anges ll-¢I2 as
shown at Fig. 3. The sleeve l5 has a series of
circumferentially spaced ports I6 opening into
the bore of the intake manifold, and the hous
ing it! forms an annular chamber l'l surrounding
and communicating with the ports, with a pas
sageway [8 leading to the annular chamber.
10
At its outer end the passageway l8 communi
cates with a valve chamber it which is formed
in housing it, the valve chamber being shown
as cylindrical and adapted to receive a rotary
valve 2%, and the valve chamber has an intake
nipple 2i circumferentially spaced from the pas
sageway it. The valve ill when turned to the
position shown at Fig. i‘ closes the intake nipple
2i, but is- cut away at one side as shown at 22 so
that when turned in the direction of arrow A to
the position shown at Figs. 2 and 3, it opens the
nile ii to the passageway in.
,
The valve it may be rotated by a lever‘ 23
whichvis linked at it to the lever 25 for the throt
tle valve t, so that when throttle rod ill is shifted
in the direction to open the throttle t‘, the valve
it is also opened as shown at Fig. 3,- and when
the throttle is closed to idling position the valve
2b is also closed as shown at Fig. l.
‘
Exhaust gases from the‘engine are preferably 30
supplied to the intake nipple 2 i, and for this pur
pose a conduit til communicates with the ex
haust manifold ‘l and leads to the intake nipple.
The invention provides means for increasing
the jet action at fuel nozzle i, preferably as the
throttlerlt is opened, and for this purpose addi
tional flow under pressure is supplied to the
mouth of the Venturi tube 45 for entraining and
then atomizing and vaporizing fuel, and this addi
tional ?ow is preferably adapted to raise the
temperature of the fuel which is drawn into the
to
Venturi tube and to supply exhaustgases theretov
' For this purpose a conduit '35 has a discharge
end tt surrounding the fuel nozzle i in the mouth
of ‘Venturi tube it, with the discharge end {it pref
erably at or adjacent the discharge-‘ori?ce of,
the fuel nozzle as shown ‘at Fig. 1, whereby the
discharge end tilt is preferably at or adjacent the
maximum cross-sectional restriction of the Ven
turi tube. The conduit 35 is preferably supplied
with exhaust gases from the manifold ‘i, the sup
ply being preferably cor'itrolled in accordance
with the position of the throttle 8. As an in
stance of this arrangement the valve chamber
it may have an outlet nipple 3i communicating
inv
2,114,548
2,
with the conduit 35, and the cut away portion of
a fuel jet having a discharge ori?ce opening into
valve 20 may be so arranged that when the valve , the Venturi tube in the direction of ?ow there
is turned for opening the intake nipple 2! to the
passageway l8, it also opens the intake nipple to
the outlet nipple 31 as shown at Fig. 3.
4
In operation, when the throttle 6 is closed to
idling position the valve 20 is also c1osed,.so
that the carburetor supplies a combustible mix
ture in usual manner, with suction past ‘the
nearly completely closed throttle drawing in air
through intake 3 so that the air entrains_and
then atomizes and vaporizes fuel at the pointvof
maximum cross-sectional restriction of the Ven- '
,turi tube 4, but as the throttle 6 is opened the
15 valve 20 is correspondingly opened, whereby ex
haust gases are supplied via conduit 35 for dis
charge into the stream of air being drawn in
through and at a point just before maximum re
striction of the Venturi tube, a conduit for ex
haust gases of the internal combustion engine
having a discharge end surrounding the fuel Jet
and opening into the Venturi tube at the dis‘
charge ori?ce of the Jet, a valve controlling ?ow
of exhaust gases through said conduit, 9. throttle
controlling flow of combustible mixture to the 10
enginehandimeans for opening and‘ closing the
valve in accordance with opening and closing of
the throttle.
2. In a carburetor adapted to form a com
bustible mixture for an internal combustion en 15
gine, a Venturi tube having an air inlet at one
through the air intake 3, with" said discharge ad
end and at its opposite end forming a passage
way supplying combustible mixture to the engine,
jacent the ori?ce of the fuel nozzle and adja
._ a fuel jet having a discharge ori?ce opening into
20 cent the point of maximum cross-sectional re-i
striction of the Venturi tube 4.‘ The exhaust
gases thus function with maximum ef?ciency to
increase the jet action of the stream of air for
drawing fuel into the Venturi tube, thereby main
taining the proper fuel ratio for different speeds
and loads and heating the fuel for complete va
porization, and'by forming a part of the com
bustible mixture insuring fuel economy and tend
ing to maintain the same proportion of exhaust
30 gases in the fuel charge at different positions of
the throttle.
At the same time a part of the exhaust gases,
controlled by the position of valve 20 which is in
turn controlledby the position of the throttle,_
35 are preferably discharged through ports l8 into
the combustible mixture in the intake manifold
5, the additional flow being introduced at a point
between the throttle valve 6 and the cylinders of
the engine as shown at Fig. 1. These exhaust
40 gases being under pressure reduce the vacuum in
the intake manifold as the engine is accelerated,
thereby assisting in maintaining the proper fuel
ratio for different speeds .and loads, and also
create turbulence in the intake manifold, insur
ing a thorough mixture of the air and fuel.
The invention thus provides an e?lcient com
bustible mixture with the air and fuel properly
proportioned for varying conditions of speed and
the Venturl tube in the direction of flow there 20
through and at a point just before'maximumu'e
striction of the Venturi tube, a conduit for ?uid
which will mix with and form a component of the
combustible mixture, said conduit having a dis
charge end surrounding the fuel jet and opening '
into the Venturi tube adjacent the discharge
ori?ce of the jet. a valve controlling ?ow of ?uid
through the conduit, a throttle controlling ?ow '
of combustible mixture to the engine, and means
for opening and closing the‘ valve in accordance 39..
. with the position of the throttle.
'
-
3. In a carburetor adapted to form a com
bustible mixture for an internal combustion en
gine, a Venturi tube having an air inlet at one
end and at its opposite end forming a passage-; 35
way supplying combustible mixture to the engine,
a fuel jet having a discharge ori?ce opening into
the Venturi tube adjacent maximum restriction
of the Venturi tube, a conduit for ‘exhaust gases
of the internal combustion engine having a dis
charge end opening into the Venturi tube just
before maximum restriction of said tube, a valve
controlling flow of exhaust gases through'said
conduit, a throttle controlling ?ow of combustible
mixture to the engine, and means for opening
and closing" the valve in accordance with the
position of the throttle.
'
4. In a carburetor adapted to 'form a com
load, and with the exhaust gases which are sup
bustible mixture for an internal combustion en-'
50 plied to the Venturi tube at its maximum cross
gine, a Venturi tube having an air inlet at one 50
sectional restriction and at the discharge ori?ce ' end-and at its opposite end forming a passage
of the fuel nozzle, thereby functioning with maxi
way supplying combustible mixture to the engine, mum e?iciency to increase the jet action and a fuel jet having a discharge ori?ce-opening into
supply heat for vaporizing the fuel, thus super ‘ the Venturi tube adjacent maximum restriction
charging the combustible mixture and increasing of the venturi tube, a conduit for ?uid which 55
the volumetric e?lciency of the engine, making will mix with and form a component of the com
it, possible to burn low grade fuel oils in a low bustible mixture, said conduit having a discharge
compression, high speed engine,
'
Lclaim:
‘
-
_
v
-
,1. In a carburetor adapted to form a com
bustible mixture for an internal combustion en
gine, a Venturi tube having an air inlet at one
end and at its opposite end forming a passage
way supplying combustible mixture to the engine,
end opening into the Venturi tube adjacent the
discharge ori?ce of the let. a valve, controlling
?ow of ?uid through the conduit, a throttle con
trolling ?ow of combustible mixture to the engine,
and means for opening and closing the valve in
accordance with the position of the throttle.
'
ROGER W. STADLMAN. _
60
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