US1671288A - Carburetor - Google Patents

Description

May 29, 1928. 1,671,288

G. M. HOLLIEY GARBURETOR Original Filed May 18, 1921.

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Patented May 29, 1928.

UNITED STATES PATENT OFFICE.

GEORGE M. HOLLEY, 0F DETROIT, MICHIGAN.

CARBURETOR.

Application iled May 18, 1921, Serial No. 470,493. Renewed December 16, 1927.

My invention relates specifically to a carburetor having a main air and primary air passages in which the main air is mechanically controlled by a throttle which also controls the primary air.

Figure l shows a longitudinal sectional elevation of a horizontal carburetor.

Figure 2 shows the throttle control isolated from the carburetor for the purposes of illustration.

Figure 3 shows a transversesectional end View on the plane X-Y of Figure 1 of the primary air throttle as it stands with relation to the primary air passage in a Wide open position of the throttle.

Figure 4 is a' corresponding view in the closed position of the throttle.

Figure l shows at A an air entrance to the carburetor controlled by the usual choke valve B; the air passage passes by the main air throttle C and through the venturi D to the carburetor exit M. Adjacent to and below the main air passage A-M is the auxiliary primary air passage EE into which pro]ects the nozzle F controlled by the adjustable needle Gr. The main air throttle C is carried by a throttle rod J, the hollow end of which K projects into the passage EE. This hollow extension K receives the nozzle F and has two opposite pairs of ports. 'llhese two pairs of ports register with the passage EE so that on moving the throttle 'C ,the extension valve K, entrance passage E and the exit passage E are suitably restricted to correspond with the given position of the throttle C. Y

Fuel is supplied to the main nozzle F `through the float chamber H which maintains the fuel at a constant level in the vicinity of the top of th`e fuel nozzle F. The throttle rod J is controlled by the throttle lever L.

The main air passage AM, the auxiliary passage EE and the fuel nozzle F are all carried in one casting P to which is secured the float bowl Q.

Mode of operation.

proportion of air to fuel is regulated by the proportions of the ports C0 and NN in the extension K of the throttle rod J and also the angle to which the axes of the said ports bear to the throttle plate C. The proportions and angles of these ports as shown y time the port N is restricted thus cutting down the supply of fuel.

On turning the throttle to the fully closed position shownin Figure 4, the small port O has taken the place of the port N and the large port O reduces the suction on the fuel nozzle F to such a point that only the minimum supply of fuel is furnished that is required to idle the engine.

Claims:

l. A carburetor having a main air passage leading to a venturi, an additional air passage eommunicating at one end withthe main air passage and at the other end with said venturi, a fuel nozzle positioned Within said additional air passage intermediate the ends of the additional air passage, whereby a mixture of fuel and air is delivered to said barrel throttle located in said additional air passage, said fuel nozzle projecting within the confines of said barrel throttle, a plurality of pairs of ports of diderent relativo capacities in said barrel throttle at a point substantially in alignment with the upper extremity of the fuel nozzle, one pair of ports serving at high speed and the other pair of ports serving at low speeds, a throttle valve in the main air passage and secured to said throttle rod, wherebv the barrel throttle and the throttle valve in said main air passage are operated together to supply a substantially constant fuel ratio to the said venturi.

l 2. A carburetor having a main air passage leading to a venturi, an additional air passage comlnunicating at one end with the main air passage and at the other end with said venturi, a fuel nozzle positioned within said additional air passage intermediate the ends of" the additional air passage, whereby a mixture of fuel and air is delivered to said venturi, a hollow throttle rod extending through said main air passage and 'provided with a barrel throttle located in Said additional air passage, said fuel nozzle projecting within the confines of the barrel throttle, said barrel throttle being provided with a plurality of pairs of ports of different relative capacities to control the admission o't' air to and from the said fuel nozzle, said ports being in substantial alignment with the upper extremity of the fuel nozzle, one pair of the ports serving at high speed and t-he other pair serving at low speed, a throttle valve in the main air passage and secured to the throttle rod, a needle valve positioned within said hollow throttle rod and screwthreaded1y connected therewith, said needle valve cooperating at its lower extremity-with the fuel nozzle, said barrel throttle, needle valve, and throttle in the main passage being operated together to thereby secure a substantially con-V stant fuel ratio mixture.

3. A carburetor having a main air passage leading to a venturi, an additional air passage communicating at one end with the main air passage and at the other end with said venturi, a fuel nozzle positioned within said additional air passage intermediate the ends of the additional air passage, whereby a mixture of fuel and air is delivered to said venturi, a throttle rod extending through said main air passage and provided with a barrel throttle located in said additional air passage, said fuel nozzle projecting within the confines of said-barrel throttle, a plurality of pairs of ports of different relative capacities in said barrel throttle at a point substantially in alignment with the upper extremity of the fuel nozzle, one pair of ports serving at high speed and the other pair of ports serving at low speed, a throttle valve in the main air passagek and secured to Said throttle rod, whereby the barrel thro-t'- tle and the throttle in said additional air passage are operated together to supply a substantially constant fuel ratio to the said venturi, a 4choke valve located in the main air passage at a point in advance of the end of the additional air passage communicating with the main air passage, said choke valve serving, when closed, to shut off the a'ir n vpassing through the main air passage and divert the air through the additional air passage to the fuel nozzle to deliver a rich mixture to the Venturi tube when starting.

In testimony whereof I affix my signature.

GEO. M. HOLLEY.

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