US1397500A - Carbureter - Google Patents

Description

c. P. BUHL.

'CARBURETER.

I APPLICATION FILED IAN- 24,1920.

1,397,500) Patented Nov. 22, 1921.

ATTORNEY lever 11.

GAY P. BUHL, 0F PASS'AIC, NEW JERSEY.

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Specification of Letters Patent.

Application filed January 24, 1920. Serial No. 353,715.

Be it known that I, GAY P. BUHL, a citizen of the United States, residing. at Passaic, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Carbureters, of which the following isa specification.

This invention relates to carbureters for internal combustion engines, and it consists in a novel combinationof parts in that class of carbureters wherein relative movement is provided for as between the members forming the delivery nozzle and venturi throat, the invention having in view to increase the efficiency of such carbureters and to render them more compact and adapted to have the movement of the one of said members that is shiftable capable of being effected with greater ease and with the use of mmpler instrumentalities than heretofore.

In the accompanying drawing,

Figure 1 is a side elevation of the carbureter, with the cover and the nearer sections of the throttle and throat members removed;

Fig. 2 is a vertical sectional view thereof;

Fig. 3 is a plan;

Fig. 4 is an elevation of the throttle device and certain accessories, shown partly in section;

Fig. 5 is a side elevation of said device; and

Figs. 6 and 7 are opposite elevations of the throat member.

The substantially cylindrical casing 1, provided at one side with a removable cover 2, has opposite radial openings 3 and 4 forming its air intake and outlet, respect vely; and it also has an opening 5 in wh ch is suitably secured, largely housed within the casing, the float chamber 6 to which the liquid fuel is admitted by the inlet 7 and from which it is delivered by the tubular projection or pipe 8 reaching across the mlxing passage 1 of easing 1, said float chamber containing any well-known constant-levelmaintaining means, as float 9 and valve 10 for inlet 7 connected with said float by the Pipe 8, which is arranged horizontally (the installed position of the carburetor being such that outlet 4 will be at the top),

16, the margin of said member being beveled i underneath and at the outsideto form an exterior marginal surface parallel with the surrounding inner marginal conical surface of lip 13. ofthe type which delivers fluid in a hollow cone, and the continuous conical outlet there- Parts 12 and 14 form a nozzle.

Patented Not/.22, 1321..

of formed by the aforesaid opposed marginal conical surfaces of said parts may be varied by turning screw 17 tapped in member 14 and having its head projecting down through and obtaining an exterior bearing on pipe 8, member 14 being upheld by a spring 18 and guided vertically by having its boss16 telescoped with the tubular portion 19 of part 12, which has fluid passages at 19. Access may be had to screw 17, for adjusting it, through a hole in the casing normally closed by ascrew-plug 17 (Fig.2).

The exterior form of the nozzle is substantially ovoid with the more rounded end downward, the upper or-less rounded end being preferably reduced to a point; and preferably the fluid outlet of the nozzle substantially coincident with its maximum transverse diameter, as shown.

There is a manually shiftable control memher which includes a throttle and a'throat-' forming device. The throttle device shown is of the double-throttle type and comprises two flat slde walls 21 joined by valves or throttles proper 22, 23, which form opposite segments of the same cylinder, and a radial:

wall or baflle-24 extending to the rearward edge of throttle proper .23.. Ahub 25 projects outwardly from one wall '21, and a shaft 26, penetrating this hub and the other wall 21, projects outwardlyfrom the latter wall. The hub and the relatively opposite end of the shaft, both of which thus project from the walls 21, are journaled in hubs 2 formed on the cover 2 and the opposite wall of the casing (the latter wall being omitted in Fig. 4). The throttle device and shaft normally rotate as one, though the former is adjustable relatively to the latter, as will appear. The throat-forming device is a sector-shaped block 27 having formed therethrough from one radial face to the other a throat 27 which is tapered and is further curved around shaft 26; said device is pinned on the shaft, being arranged between the walls 21 of the throttle device with the larger end of its throat downward as the parts are seen in Fig. 2. The purpose of the relative adjustment, rotatively, of the shaft and throttle deviceisto alter, rotatively, the positions or" the throttle and throat-forming devices relatlvely to each other. For eliect ing this adjustment (while normally pre-- serving the parts fixed with reference to each other) aworm-wheel 28 is fixed on the hub '25 and a 'yoke 31 is' fixed on the shaft, the

yoke having journ'a led therein a worm:'29 engaging the worm-wheel and equipped with a milled nut '30 for turning it. The control against thelefthand section of the throttle device. Having introduced the shaft through this section, then through the throat member, and then-through the other section "of the throttle device, and having pinned the throat memberto the shaft, these parts journaled in cover-hub 2;

worm-wheel and yoke 31 are fixed on the are introduced into casing 1 so that said end of the shaft is journaled in casing hub 2". Then the cover 2 is applied, leaving hub 25 Finally the hub 25 and shaft 26, respectively; There is a pin 23 onthefleft-hand section 23 engag- 'ing asuitableholenot shown-An the other section to lock the former-to the latter for rotation therewith, The curved outer jsurfacesofthe valves or throttles proper 22, 23 and the throat-forming devicebear face to facea'gainst the inner surfaceof the cylindrical wall of the-casing; I i 7 hen the throttledevice is inthe position shown in Figl itfully closes'the intake '3; but at that timea notch 32 in throttle proper 23 permits the engine suction to produce a throat.

copious flow at the nozzle, atmospheric air being then admitted .to chamber 6'through an orifice 33 (Fig. 2).

The members 121& and 27 together pro duce a throat forming means in which one is movable lengthwise of the axis of the throat to vary the volume o'ffiuid adapted to pass therethrough,"due'to the taper of the I have obtained compactness of structure, facility of movement of the moving part and simplicity ofthe instrumentalities for actuating said part because the movement is pivotal rather than rectilineal.

ing through the throat is reduced because the nozzle is substantially ovoid in form and ward the outlet of the "throat, and notwithstanding the curvature ofthe throat such nozzle makes the throat one of the venturi iNoise and undue turbulence of the air'pass has its smaller'endprojectingrelatively toclass and on account of its peculiar form;

taken with the curvature of the throat, causes the zone of greatest restriction ofthe venturi to be disposed desirably above the annular fuel: outlet of-the nozzle: this zone of greatest restriction otthe'venturi, it will be seen, is substantially contiguous to the inclined plane represented'by the upper face of the member 27 in the position of said member illustrated in Fig. 1.

Having thus fully described my inventlon, what I claim as'n'ew and deslreto secure by Letters Patent 1s-:- A I A carbureter venturi means including a throat-forming member, and a substantially ovoid air-flow obstructing memberarranged 1n the throat of the'fi'rst member and spaced therefrom, oneof sa d members being-shiftable'relatively to the other in a path curved around an axis transverse to and exterior of the throat and the throat being tapered and, curved around said axis, the obstructmg member having its smaller end projecting,

toward the-smaller end of the throat.

In testimony whereof'l' affix my signatureg

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