US2661937A - Concentric carburetor - Google Patents

Description

Dec. 8, 1953 M. J. KlTTLER 2,651,937

CONCENTRIC CARBURETOR Filed July 1, 1949 2 Sheets-Sheet 1 '1 E Mel-li iifle)" INVEN TOR.

M. J. KITTLER CONCENTRIC QARBURETOR Dec. 8, 1953 Filed July 1, 1 949 M Jfiz'iiler INVENTOR.

rqTT A A/EY Patented Dec. 8, 1 953 TQ F C C()JN'CENTRIC CARBURETOR Milton .1. Kitt ler, Detroit," Mich.,.assignor to George M. Holley and Earl Holley ApplicationJuly 1, 1949, Serial No. 102.687 7 The object ,of, thi s inventionis'to reduce the manufacturing cost of concentric carburetors and :their air cleaners. At present these carburetors are made with three castings:

(l) Anair entrance castingwhich carries the choke valve and choke operating mechanism and to which the air cleaner is connected.

(2) A float chamber located entirelyinside No. 1 casting. a

(3) A venturi and mixture outlet casting in which is located the throttle valve and throttle operating mechanism.

By eliminating the No. 1 casting the cost of the carburetor is materially reduced. The usual air cleaner and air silencer can be used as a cover to enclose completely the No. 2 casting so as to take the place of the No. 1 casting. a

Fig. 1 shows in cross-sectional elevation the preferred form of my invention with an air cleaner (silencer) shown in place.

Fig. 2 shows in cross-sectional elevation on a plane at right angles to that of Fig. 1 a view of the carburetor with the air cleaner (silencer) removed. 7 a

In the figures, I0 is the air entrance. I2 is one of the venturis, I4 is the other; I6 is one of the rich mixture outlets, I8 is the other. centrically mounted choke shaft 2| is provided with two choke valves. valves, 22 is the other. 24 is a circle D opening in the center of the choke valve 20 which, when turned clockwise 90 engages with the end of the tube I6. 26 is the corresponding D opening in the choke valve 22. 28 is the throttle valve below the choke valve 20. 30 is the other throttle valve.

32 and 34 are low speed fuel outlets which discharge downstream of the throttle 28 when the throttle is opened. 36 and 38 are the two other corresponding low speed fuel outlets.

40 is the low speed fuel passage communicating with the chamber 42. 44 is a restricted passage connected to the bottom fuel well 46 (Fig.

2). 48 is a similar well for the right hand air passages.

50 is an air passage communicating with the atmosphere and to the inside of the perforated tube 52 through the restricted passage 54. 63 is An ec-' forated tube 52 and comm 'cating with the rich mixturetube I8 through the inclined'pass'age 65 which enters theupper part of well 48.

.64'is a restricte'd'air' passage corresponding .to restricted passage '54... I

:66 is a restricted air entrance to the rich mixture tube I8 from the air passage 60.

12 is a restricted air entrance to chamber 42 communicating with the air entrance. I4 is a similar restricted air entrance into the chamber 82.

84 is a restricted fuel outlet from well 48 discharging into the chamber 82.

A low speed fuel passage 90 connects the chamber 82 with the low speed fuel outlets 3G and 38 controlled by the throttle valve 30.

A vacuum operated enrichening valve I06 is opened when the pressure downstream of the 20 is one of these choke v an inclined passage from the well 46 to the rich mixture tube I6. The air passage communicates with the mixture tube 'I6through the restricted opening 56. v

is the air passage to the right, corresponding to the air passage 50, to the left.

62 is a perforated tube corresponding to perthrottle 28 rises subsequent to the opening of the throttle 28 during acceleration. A passage I08 transmits the suction downstream of the throttle 28 to the chamber IIO above the piston III. Piston III descends and opens valve I06 when suction in passage I08 fails to compress spring II2, that is when the throttle 28 opens.

H4 is the normal (lean) fuel nozzle which admits the fuel required, for steady running, into the well 46.

A flange I I6supports an air cleaner I I8.

An accelerating pump diaphragm I20 operates by the vacuum in the passage I08 when the vacuum is reduced and discharges fuel under the influence of the compression spring I22.

A check valve I24 controls the admission of fuel to the pump.

A fuel. entrance I28, in the flange H8, leads fuel from the fuel supply pump, not shown, past the check valve I28, to the float chamber I30 in which the float I32, mounted on the pivot I3I, maintains the fuel level.

Operation The operation of this carburetor differs from the operation of carburetors in general use by the action of the perforated choke valves 20 and 22 engaging with the rich mixture tubes I6 and The two D-shaped openings 24 and 26 line up with the ends of the two rich mixture tubes I6 and I8 when the choke shaft 2] is rotated creates an eddy which draws fuel from the left to the right (Fig. 1) through opening 24.

The air cleaner being large is difiicult to locate under the hood of any ordinary car. The compact arrangement secured with this construction not only saves money but space. If the choke valve were placed in the air entrance to the air cleaner it would collapse under the engine suction to which. it. would be subjected.

What I claim is:

1. In a combined air cleaner and carburetor construction, an upright conduit defining a fuel mixture passageway with a Ventur'r restriction therein, a laterally extending flange at the upper extremity of said conduit, a dome-shaped air:- cleaner and silencer having a depending portion engaging the periphery-oi said flange a carburetor float chamber structure supported by said flange entirely above said conduit in said dome-shaped air: cleaner, a choke valve in said! passageway at; said: Ventufi restricti'om.v a throttle,- valve. Jim said passageway, belowssai-d choke valve; and shafts; foransaida valves: extending. laterally: of; said conduit: below saidv flange and air cleaner and through;=-said passageway.

72 A}; devicea'as .diefined claim; 1; including 4 a fuel nozzle projecting downwardly from said float chamber structure into said passageway and terminating at the shaft of said choke valve at one side thereof, said choke valve having a relatively large opening therethrough, said opening registering with the discharge end of said nozzle so as to provide an outlet below the centerline of the choke shaft in all positions of the choke References Cited in the file of this patent UNITED STATES PATENTS aw-mes

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