US1061835A - Carbureter. - Google Patents

Description

E. GOBB'I.

GARBURBTER. v

APPLICATION FILED JULY 24, 1911. v 1,061,835. Pa1e111ed111ay13,1913.

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EMILIO GoBEI, or ASNIERES, FRANCE.

CAEBUEETEE.

specification of 'Letters Patent.

Patented May 13, 1913.

Application. led July 24, 1911. Serial 110.640,298.

T0 au whom t may concern Be it-known that I, EMILI GOBBI, a sub.

ject of the King of Italy, residing at Asnires, Seine, JFranCe, have invented certain new and. useful Improvements in Carbureters, of which the following is a speciiication.

This invention relates to improvementsin carbureters, and its primary object, namely, to provide an extremely sensitive and responsive arrangement which will correctly proportion the mixture with the engine run-` ning both at high and low speed, is served by a number of novel features of construction.

According to the invention, the bore of the nozzle, which in spray Icarbureters, is used for conducting liquid hydro-carbon to the spraying orifice, communicates Awith van aperture provided in the wall of the nozzle and arranged below the level of the liquid in the constant level chamber, whereby, during the normal running of the engine, a-`

draft of air is induced into the nozzle, lthe intensity of which is proportionate toj the suction exerted, and which is efectiveto insure the proper proportioning of the hydro-carbon constituent of the explosive mixture.

A further feature of the invention is the provision of a throttling device that may be closed directly against the nozzle and to completely cut off the motor suction tube and the main air supply inlet, this throttling device having a small orifice which, when the device is in closed position, communicates with the nozzle and havin an'auxiliary air inlet passage. Ordinarily, with a throttle of the usual construction, in closed position there is always a communication between t-he main air inlet and the motor suction tube-and between the latter and the nozzle; in other words, there is never a complete cut off. The objection to this arrange.

ment is that when the engine is running at excessively low speed and the throttle is closed, it is impossible to secure a proper proportion of the air and hydro-carbon constituents of the explosive mixture, and there will be an excess of air. This object-ion is eliminated by the throttling device of the present invention, by means of which a comparatively strong suction action is transmitted to the nozzle by which the hydrocarbon is conducted, and at the same time a suitable and not excessive supply of air is induced. When the novel throttling device is used with multiple-nozzle carbureters, it is lto be closed at least against one of the nozzles. A The invention will be understood from the accompanying drawings, wherein:

Figure 1 is a longitudinal section on the constructed in accordance with this invention; Fig. 2 is a cross-section on the line 2-2 Of Fi 1; Fig. 3 is an axial section of a mod' ed form of nozzle; and Figi 4 is a similarview of a further modication.

Referring to Fig. l, the nozzle 1, which is provided lwith a spraying orifice 2, is disposed within a substantially tubular casing 3 having an air inlet 4. This casing is also provided with a collar 5 which is connected to the suction pipe 6 of the engine, and with ,a throttling device?. At one side of the casing, there is disposed a constant-level fuel tank 8 equipped with a float 9 and with an 4externally-threaded nipple 10 which serves to connect the tank and the supply pipe 11 for the liquid hydro-carbon. Said tank is also furnished with a needle valve l2 and communicates with the nozzle 1 by way of a conduit 13, the valve just referred to being carried by the iioat.

The nozzle ,l is -apertured for the purpose of inducing adraft of air therethrough when the hydro-carbon is drawn through the orifice 2 with suicient speed. In Fig. 1,such apertures are shown at 14 and open upwardly and inwardly intoV thebore of the nozzle; but in place of the said apertures the nozzle may be provided with a series of spaced conical iianges 14', (Fig. 3), which form av multiple injector, or with a foraminous section 142, (Fig. 4).

`By adopting the arrangement described, a mixture will be obtained during the suction of the engine, (except when the engine works at an excessively slow speed and the suction force is correspondingly low,) which will serve to eifectively regulate the quantity of hydro-carbon drawn in at each suction stroke of the engine. A lossv of the hydro-carbon occurs when the engine is standing still, (obviously no loss takes place when the engine is working, because the hydro-carbon, instead of escaping through line l-1 of 2, of one form of carbureter normal level of the hydrocarbon in tank 8,

bears directly against said nozzle.

the tube being preferably provided with a tapered lining 16 whose greatest thickness is at its lower end. In conjunction with said tube there is provided a conical ange 17 which is located at the top of the nozzle and is designed to concentrate and direct into the tube a fairlyvlargeE portion of the air that, during the suction stroke of the engine, is drawn through the air inlet 4,

4such portion being, of course, dependent on the dimensions of the fiange, as well as on the velocity of lthe air entering said inlet. Under" these conditions, there will be obtained, on the stoppage of the engine, a reserve of hydro-carbon in the said tube. At the first suction strokes'of the engine, the hydrocarbon thus placed in reserve will be drawn through the hole or holes 14, and during the normal working of the engine the desired suction of air for producing the explosive mixture will be effected.

The throt-tling device 7 is in the form of a plate, and is arranged in the casing 3, above the nozzle l, its arrangement b eing of such nature that in its closed position it The throttling device is provided with an upwardly widened orifice 18 which alines with -the spraying orifice -2, and communicateswith an air conduit 19, which, in turn, opens and in which a regulating valve 20 may be fitted. When the throttling plate 7 is in its closed position it completely cuts off the motor suction tube 6 and the main air inlet 4. Its orifice 18 alines with the spraying orifice 2, so that a strong suction action is transmitted to the latter, and an adequate supply of liquid hydro-carbon is secured when the engine is running at low speed. At the same time, a proportionate amount of air is drawn in through the passage 19. Thus, for a given range of low speed, a proper mixture of air and hydro-carbon is obtained.

As shown in Figs. 1 and 2, the throttling plate is in the form of a disk having a diametrically arranged pin 21, the projecting` ends of which serve as trunnions. The nozzle l is arranged eccentrically of the casing 3, andthe air inlet 4 is arranged laterally of the casing 3. The plate 7 is provided on its upper side with. an arcuate flange 22, the

radius of.which is taken` from the pin 21 asl a center. This flange 22 is located on that side of the plate 7 which is in line with the inlet l4, and will contact With the adjacent side of the casing 3 in any position of said plate. Consequently, the airdrawn in through the inlet 4 will be prevented from `passing between the throttle and the adjacent side of the casing, but on the other hand,.will be positively directed immediately over the nozzle so as to intimately mingle with the fluid discharging at the orifice 2.

The nipple 10 which connects the fuel tank to the inlet conduit 11 for the hydrocarbon, and the needle valve 12 are preferably arranged `so that the hydro-carbon passes into the tank from the top, in which case said nipple is provided with a depending tubular extension 23 and the float 9 is provided with a corresponding tube 24,

a casing adapted for connection to the suction pipe of an engine and provided with an air inlet; of a nozzle disposed within the casing; a tube inclosing said nozzle and spaced therefrom; a conical flange provided yupon-the upper end of said nozzle and extending pastthe upper end of said tube, for directing air into the space between the tube and the nozzle; and means for 'supplying fuel to the nozzle, said nozzle having an aperture through which the air is drawn thereinto fromv said space simultaneously with 'the fuel, to mix directly with the latter, by the suction created in said casing.

2. In a carbureter, the combination with a casing adapted for connection to the suction pipe of an engine and provided with an air inlet; of a nozzle disposed within the casing and provided with a spraying orifice; means for supplying fuel to said nozzle; and a throttle located in said casing and comprising a pivotally-mounted disk provided with an orifice and with a conduit opening at one end into the latter and at the other end. through the bottom face of the disk, the orifice in said disk registering directly with the first-named orifice when the throttle is closed.

3. In a carbureter, the combination with a casing adapted for connection to the suction pipe of an engine and provided with an air inlet; of a nozzle disposed within the cas-. ing; a tube inclosing said nozzle and spaced therefrom; a conical flange provided upon the upper end of said nozzle and extending past the upper end of said tube for directing air intov the space between the tube and the nozzle, said nozzle having upwardly and inmy hand in presence of two subscribing wit- Wardly directed apertures below: the fuel nesses. level throughwhichl the air is drawn there- EMILIO GOBBI. Into from said space slmultaneously with 5 the fuel, to mix-directly with the latter, by Witnesses:

the suctioncreated in said casing. H. C. COXE,

In testimony whereof I have hereunto set PAUL BLUM.

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