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Патент USA US2404645

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Parented July 23, 1946
2,404,645
ATENT OFFICE
UNITED ' STATES
g
2,404,645
(LÀRBUREII‘ORl
Marion Mallory, Detroit, Mich.
Application June 25, 1945, Serial No. 601,455
14 Claims.
(Cl. 12S-423)
1
2
This invention relates to a carburetor for an
The operation of my carburetor is as follows:
As shown in the drawing throttle valve E is wide
open and governor valve |Il is almost closed. Un
der these conditions the pressure vat oriñces I 8
and I9, which are the customary idle jets of the
internal combustion engine.
Where a governor throttle valve is positioned
between the manual throttle valve and the en
gine, then when the engine is working under no
load or real lightJ loads and the governor valve is
almost closed and the manual throttle valve is
wide open, th'e fuel mixture becomes very lean
carburetor, will be substantially atmospheric and
the only fuel obtained by the engine is that drawn
out of main jet I5 through venturi It. With
governor valve l!! nearly closed, the velocity
through venturi I4 is so low that in the absence of
power jet 2| so little mixture would be drawn out
of main jet I5 that the mixture would become too
lean. However, under the above conditions, ori
thereby causing overheating and rolling ofthe
engine which in turn causes the governor valve
to surge.
It is the object of this` invention to overcome '
the above objection which results from the use of
an automatically operated governor valve be
iice 2.8 is on the atmosphere side of governor
valve IB and in substantiallyatmospheric pres
sure, which pressure establishes itself in cylin
tween the carburetor and the engine. This ob
ject is accomplished simply and efficiently by uti
lizing the intake passageway pressures. adjacent
der 24 belowrpiston; itV and permits spring 26 to
the governor throttle valve to control a power jet
raise piston 23 and lift needle valve 22 from power
which opens and admits more fuel through the
jet 2| and thereby admit more fuel through main
main jet whenever the above conditions obtain. 20 jet I5 to the engine. As soon as valve Ii! opens
Fig. Lis a vertical section through my carbu
wide enough to permit more air to flow through
retor.
venturi I4, then orifice 28 will be positioned be
Fig. 2‘ is a fragmentary vertical section showing
tween governor valve Iii and the engine, that`
a modified form of the same.
The parts forming my carburetor are as fol
is, in the intake passageway-vacuum. Under such
' conditions the intake passageway vacuum on the
lows: carburetor housing I, governor body 2 posi
tioned` between the carburetor housing and the>
engine, intakey passageway It, air inlet 4, outlet
to the engine 5, manually controlled throttle valve
Ii preferably of the butterñy type, valve shaft 1, 30
crank arm 8 fixed on shaft l, rod 9 for controlling
carburetor throttle valve 6, governor throttle
valve IEI preferably of the butterfly type mounted
on shaft II, float bowl I 2‘, fuel level I3, venturi I4,
main jet I5 connected by passageway It with ori 35
iice il in fuel bowl' I2, idle jets I 8 and I9 con
nected by passageway 26 with passageway I6,
power jet 2| communicating with passageway I6
(the orifices Il and 2| are positioned below fuel
level I3), needle valve 22 controlling power jet
2|, piston 23 in cylinder 24, arm 25 connecting
piston 23v and valve 22, compression spring 2t
tending to raise piston 23 and hold valve 22 open,
engine side of valve IEI will now establish itself
in cylinder 24 thereby drawing piston 23 down
against compression spring 2tV and thereby closing
power J'et 2|. However, closing of power jet 2|
under such conditions will not cause the mixture
at main jet |15 to become too lean because even
though power jet 2| is closed the velocity through
venturi I4 by jet `I5 will be high' due to the open
ing of governor valve i!) and sufficient fuel will
be drawn out of main jet I5 to satisfy the fuel
mixture requirements of the engine.
`
The modif-led form of my carburetor shown in
Fig. 2 is identical with that shown in Fig, l ex
cept that passageway 21 terminates at orifice 3i!
which- is positioned at all «times between the en
gine and governor valve Iii. In addition, I pro
vide orifice 3| which is positioned between gov
ernor valve iii and Valve 6, cylinder 32, compres
passageway 2l connecting cylinder 24 with ori
iice 28 positioned on the atmosphere side of valve 45 sion spring 33, oriñce 34 connecting cylinder 32
I0 when nearly closed.
with the intake passageway below piston 35, pis
ton 35, oriiice 35 between passageway 27 :and cyl
It is understood that governor valve I@ is auto
matically operated and may be any of the known
inder 32 above piston 35. Orifice 3| can be posi
automatically operated types of governor such as
tioned so that it is on the atmosphere side of
the unbalanced velocity type governor valve, the 50 valve lo in al1 positions of valve ID, but preferably
engine driven centrifugal weight actuated type
oriiice 3| is located adjacent valve Iii so that
of governor, or the intake passageway pressure
oriñce 3| is on the atmosphere side of valve I?
actuated governor such as shown in my cepend
when valve lil is closed sufficiently to cause the
ing application Serial No. 466,961, filed November
velocity to drop so low in venturi I4 that the fuel
25, 1942.
55 mixture becomes too lean and in wider open po
2,404,645
3
jacent said governor valve for controlling said
sitions of valve III, orifice 3l will pass onto the
engine side of valve IIJ.
.power jet, a conduit connecting said pressure
The operation of the modified form is as fol
lows: When throttle I0 becomes nearly closed or
far enough -closed to cause the velocity to drop
so low in venturi I4 that the mixtures become
too lean, the high vacuum between governor
valve II) and the engine will establish itself
actuated means with the intake passageway on
pheric, this pressure will establish itself in cylin
closes said power jet.
the atmosphere side of and adjacent the gover
nor valve when nearly closed and with the intake
passageway on the engine side of said governor
valve when the governor throttle valve is opened
beyond idle position to an extent where the iluid
through'oriñce 34 in cylinder 32 beneath piston
Velocity by the main jet will draw fuel from the
35 thereby drawing piston 35 downwardly and 10 main jetat a rate to produce a sufñciently rich
placing orifice 3| in communication with orifice
mixture whereby said pressure actuated means
responds to the pressure in the intake passage
3S and passageway 21. Since the pressure at
Y way on the engine side of said governor valve and
oriñce 3l at this time will be substantially atmos
der 24 beneath piston 23 and spring 26 will move 15
~
4. In a carburetor for an internal combustion
piston 23 upwardly thereby opening needle valve
engine having an intake passageway, a venturi in
said intake passageway, a main fuel jet in said
venturi, a source of fuel connected to said jet, a
governor Valve on the engine side of said main
22 and permitting fuel to be drawn through
power jet 2| into passageway I5 thereby enrich
ening the fuel mixture. ’ When governor valve Ill
opens far enough so that the velocity through 20 jet, a power jet for feeding fuel> into said intake
venturi I4 by jet I5 will be high enough to draw
sufñcient fuel from orifice I‘I and jet I5 to satisfy
passageway, means actuated by changes of pres
sure in the intake passageway 'adjacent said gov
the fuel mixture requirements of the engine, then
ernor valve for controlling said power jet, a con
duit connecting said :pressure actuated means
piston 35 will rise and shut olf communication
between orifices 3| and 36 but at this time the
intake passageway vacuum at orifice 3B will be
2.5
with the intake passageway on the atmosphere
side of and adjacent the governor valve when
established. through passageway 2l in cylinder
Y24 thereby causing piston 23 to move downwardly
nearly closed whereby said pressure actuated
means responds to the pressure in the intake pas
sageway on the atmosphere side of the governor
and close valve 22. Here again the mixture at
main jet I5 will not become too lean because the 30. valve and opens said >power jet, said conduit con
opening of governor valve VIll will increase the
velocity through venturi I4 and draw more fuel
ffrom main jet I5. Where the engine is operating
necting said pressure actuated means with the
intake passageway on the engine side of said gov
ernor valve when the governor throttle valve is
opened beyond idle position to an extent where
the fluid velocity by the main jet will draw fuel
from the main jet at a rate to produce a suffi
under high load with both governor valve Ill and
throttle valve 6 wide open, then, particularly at
lower engine speeds, the power jet 2l will be open
and in operation thus enriching the fuel mixture
for such high load operation.
oiently rich mixture whereby said pressure ac
tional fuel supply system for supplying fuel into 45
said intake passageway including an auxiliary
jet, and means actuated by changes of pressure "
in the intake passageway for controlling said
auxiliary jet, said means responding to substan
tially atmospheric pressure in the intake passage 50
tuated means responds to the pressure in the
intake passageway on the engine side of said gov
ernor valve and closes said power jet.
5. In a carburetor for an internal combustion
engine having an intake passageway, a venturi in
said intake passageway, a main fuel jet in said
venturi, a source of fuel connected to said jet, a
governor valve on the engine side of. said main
jet, a manual throttle valve between the governor
valve and the main jet, a power jet for feeding
fuel into said intake passageway, means actu
ated by changes of pressure in the intake pas
sageway adjacent said governor valve for con
way on the atmosphere side of the governor valve
trolling said power jet, a conduit connecting said
when nearly closed to open said auxiliary jet and
admit fuel into the intake passageway.
ì way on the atmosphere side of and adjacent the
I claim:
1. In acarb-uretor for an internal combustion 40
engine having an intake passageway, a main fuel
jet in said passageway, a source of fuel connected
to said main jet, a governor valve in said passage
way on the engine side of said main jet, an addi
pressure actuated means with the intake passage
2. In a carburetor for an internal combustion
governor valve when nearly closed whereby when
engine having an intake passageway, a power jet 65 the manual throttle valve is wide open said pres-y
for supplying fuel into said passageway, a source
sure actuated means responds to the pressure in
of fuel connected to said power jet, a governor
the intake passageway on the atmosphere side of
valve on the engine side of said power jet, means
the governor valve and opens said power jet, Vsaid
actuated by changes of pressure in the intake
conduit connecting said .pressure actuated means
passageway for controlling said power jet, said 60 with the intake passageway on the engine side of
means responding to the pressure in the intake
said governor valve when the governor throttle
passageway onl the atmosphere side of said gov
valve is opened beyond idle position to an extent `
ernor valve when nearly closed to open said
where the fluid velocity by the main jet will draw
power jet and admit fuel into said intake pas
fuel from the main jet at a rate to produce a suñi
sageway, and said means responding to the pres 65 ciently rich mixture whereby when the manual
sure in the intake passageway on the engine side
throttle valve is wide open said pressure actuated
of said governor valve when opened to shut off
said power jet.
‘
3. In a'carburetor for an internal combustion
means responds to the pressure in the intake
passageway on the engine side of said governor
valve and closes said power jet.
Y
engine having an intake passageway, a main fuel 70
6. In a carburetor for an internal combustion>
jet in said passageway, a source of fuel connected
engine having an intake passageway, a venturi in
to said J'et, a governor valve on the engine side of
said intake passageway, a main fuel jet .in said
said main jet, a power jet for feeding fuel into
venturi, a source of fuel connected to said jet, a
said intake passageway, means actuated by
governor valve on the engine side of saidk main
changes of pressure in the intake passageway ad- ,
jet, a manual throttle valve between the gov
2,404,645
5
6
ernor valve and the main jet, an idle jet between
valve when the governor throttle valve is opened
the. manual throttle valve and the governor valve
beyond idle position to an extent where the‘fluid '
for feeding fuel into said intake passageway when
velocity by the main jet will draw fuel from the
theA manual throttle valve is' closed for idling the
main jet at a rate to produce a sufficiently rich
engine, a power jet for feeding fuel into said in~
mixture whereby said pressure actuated means
take passageway, means. actuated by changes of
responds to the pressure in the intake passage
way on the engine side of said governor valve and
pressure in the intake passageway adiacent said
closes said power jet valve.
‘
governor valve for controlling said power jet, a
9. In a carburetor for an internal combustion
conduiteonnecting said pressure actuated means
with the intake passageway on the atmosphere 10 engine having an intake passageway, a main fuel
jet in said passageway, a source of fuel connected
side of and adjacent the governor valve when
to said jet, a governor valve on the engine side
nearly closed whereby when the manual throttle
of said main jet, a power jet for feeding fuel into
valve is wide open said pressure actuated means
said intake passageway, means actuated by
responds to the pressure in the intake passageway
on the atmosphere side of the governor valve and 15' changes of pressure in `the intake passageway
adjacent said governor valve for controlling said
opens said power jet, said conduit connecting said
power jet, an oriñce positioned in the intake
pressure actuated means with the intake pases-igen
passageway o-n the atmosphere side of and ad
way on the engine side of said governor valve
jacent the governor valve when nearly closed to
when the governor throttle lvalve is opened beyond
idle position to an extent where the fluid velocity 20 a position so that the fuel drawn from the main
jet by the air flowing past said jet provides- a too
by the main jet will draw fuel from the main jet
lean mixture, a conduit connecting said pressure
at a rate to produce a sufficiently rich mixture
actuated means with said orifice whereby the
whereby when the manual throttle valve is wide
governor valve in closing reaches said above speci
open said‘pressure actuated means responds to
the pressure in the intake passageway on the
engine side of said governor valve and closes said
power jet.
7. In a carburetor for an internal combustion ,
engine having an intake passageway, a main fuel
jet in said passageway, a source of fuel connected
to said jet, a governor valve on the engine side of
said main jet, a power jet on the atmosphere side
of said governor'valve for feeding fuel into said
intake passageway, a valve controlling said power
jet, means actuated by changes of pressure in the
intake passageway adjacent said governor valve
for controlling said power jet valve, a conduit
fied position the pressure `actuated means re
sponde to the pressure in the intake passageway
on the atmosphere side of the governor valve and
opens said power jet, said orifice passing on to
the engine side of the governor valve when the
governor valve is opened to a position where the
air now by said main jet will draw suiiicient fuel
through the jet to produce a proper fuel mixture
whereby said pressure actuated means responds
to intake Ypassageway pressure and closes said
power jet.
l0. In a carburetor for an internal combustion
engine having an intake passageway, a main fuel
iet in said passageway, a source of fuel connected
connecting said pressure actuated means with
the intake passageway on the atmosphere side 40 to said jet, a governor valve on the engine side
of said main jet, a power jet for feeding fuel into
of and adjacent the governor valve when nearly
said intake passageway, means actuated by
closed whereby said pressure actua-ted meansI re
changes of pressure` in the intake passageway ad
sponds to the pressure in the intake passageway
jacent said governor valve for controlling said
on the atmosphere side of said governor valve
power jet, an orifice positioned on the atmos
and opens said power jet valve, said conduit con» 45
phere side of and adjacent the governor valve
necting said pressure actuated means with the
when closed to a position where the air flow by '
intake passageway on the engine side of said
the
main jet will draw fuel from the main jet
governor valve when the governor throttle valve
at a rate to produce a too lean mixture, a second
is opened beyond idle position to an extent where
the fluid velocity by the main jet will draw fuel 50 orifice. positioned at all times on the engine side
of the governor valve, a conduit connecting said
from the main jet at a rate to produce a suñî
first and second orifices with said pressure actu
ciently rich mixture whereby said pressure actu
ated means, a valve actuated by changes of pres
ated means responds to the pressure in the intake
sure in the intake passageway on the engine side
passageway on the engine side of said governor
of said governor valve for controlling said ñrst
valve and closes said power jet valve.
55
mentioned orifice, said pressure actuated valve
8. In a carburetor for an internal combustion
closing said ñrst mentioned orifice whenever the
engine having an intake passageway, a venturi
governor Valve is opened sufficiently to bring said
in said intake passageway, a main fuel jet in said
first mentioned orifice on to the engine side of
venturi, a source of fuel connected to said jet, a
said governor valve, said pressure actuated Valve
governor valve on the engine side of said main 60 opening said iirst mentioned orifice when the
jet, a power jet on the atmosphere side of said
governor valve is closed sufficiently to bring said
governor valve for feeding fuel into said intake
first mentioned orifice on to the atmosphere side
passageway, a valve controlling said power jet,
of said governor valve whereby said pressure
means actuated by changes of pressure in the
actuated means responds to the pressure in the
intake passageway adjacent said governor valve 65 intake passageway on the atmosphere side of said
for controlling said power jet valve, a conduit
governor valve and opens said power jet.
connecting said pressure actuated means with
11. In a carburetor for an internal combustion
the intake passageway on the atmosphere side
engine having an intake passageway, a throttle
of and adjacent the governor valve when nearly
valve, a main fuel jet in Ysaid passageway on the
closed whereby said pressure actuated means re 70 atmosphere side of said throttle valve, a source
sponds to the pressure in the intake passage
of fuel connected to said jet, a governor valve on
way on the atmosphere side of the governor valve
the engine side of said main jet, a power jet for
and opens said power jet, said conduit connecting
said pressure actuated means with the intake
passageway on the engine side of said governor
feeding fuel into said intake passageway, means
actuated by changes of pressure in the intake »
passageway for controlling said power jet, an
2,404,645
7
8
oriñce positioned in said intake passageway be
tween the governor ‘and throttle valves, a second
valve in said intake passageway, a main fuel jet
in said passageway on the atmosphere side of said
throttle valve, a source of fuel connected to said
orifice positioned at all times on'the engine side of
the governor valve, a conduit connecting said
first and second oriñces with said pressure ac
tuated means, a valve actuated by'changes of
pressure in the intake passageway on the engine Y
si'de of said governor valve for controlling said
iirst mentioned oriñce, said pressure actuated
main jet, a governor valve in said passageway on
the engine side of said throttle valve, an addi
tional fuel supply system including an auxiliary
jet for supplying fuel into said intake passageway
on the atmosphere side of said throttle valve, and
means actuated by changes of pressure in the in
valve closing said first mentioned orifice when 10 take passageway on the engine side of said throt
ever the throttle valve is substantially wide open
tle valve for controlling said auxiliary jet, said
and the governor valve is opened suiiiciently to
cause the fluid velocity by said main fuel jet to
draw sufficient fuel from said main jet to produce
a sufficiently rich mixture, said pressure actuated
valve opening said first mentioned orifice when
the throttle valve is substantially wide open and
the governor valve is closed sufficiently to cause
means responding to substantially atmospheric
pressure in the intake passageway on the atmos
phere side of the governor valve when nearly
closed and when said throttle valve is substan
tially wide open to open said auxiliary jet and
admit fuel into the intake passageway, saidV
means also responding to substantially atmos
pheric pressure in the intake passageway such as
the velocity to drop so low by the main jet that
the fuel mixture becomes too lean whereby said 20 occurs when both the governor and throttle
pressure actuated' means responds to the pres
sure in the intake passageway on the atmosphere
side of said governor valve and opens said power
valves are substantially wide open and the engine
is operating under high load.
jet.
engine having an intake passageway, a main fuel
f
14. In a carburetor for an internal combustion
12. In a carburetor for an internal combustion 25 jet in said passageway, a source of fuel connected
engine having an intake passageway, a throttle
to said main jet, a governor valve in said pas
valve _in said intake passageway, a, main fuel jet
sageway on the engine side of said main jet, an
in said passageway on the atmosphere side of said
additional fuel supply system including an aux
throttle valve, a source of fuel connected to said
iliary jet for supplying fuel into said intake pas
Ymain jet, a, governor valve in said passageway on 30 sageway on the atmosphere siderof said governor
the engine side of said throttle valve, an addi
valve, and Vmeans actuated by changes of pres
tional fuel supply system for supplying fuel into
sure in the intake passageway for controlling
said auxiliary jet, said means responding to sub
stantially atmospheric pressure in the intake pas
said intake passageway including an auxiliary jet,
and means actuated by changes of pressure in the
intake passageway on the engine side of said 35 sageway on the atmospheric side of the governor
throttle valve for controlling said auxiliary jet,
said means responding to substantially atmos
pheric pressure in the intake passageway on the
valve when nearly closed to open said auxiliary
jet and admit fuel into the intake passageway,
said means also responding to substantially at
atmosphere side of the governor valve when
mospheric pressure in the intake passageway
nearly closed and when said throttle valve is sub 40 such as occurs when thegovernor valve is in wide
stantially wide open to open said auxiliary jet
open position and the engine is operating under
and admit fuel into the intake passageway.
high load to thereby open said auxiliary jet and
13. In a carburetor for an internal combustion
admit fuel -into the intake passageway.
engine having an intake passageway, a throttle
MARION MALLORY.
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