US1687131A - Carburetor - Google Patents

Description

Oct. 9, 1928.

C. F. JOHNSON CARBURETOR May 5,

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- This inventlon consists -in a carburetmg' o carbureting ch wannabe-9.192s

UNITED STATES,

r. Jonson, or nrrnorr, '1

A E T lC .-k-

invention relates to carburetors for internal combustion engines for motor cvehicles which carburetors are provided with ofiset fuel chambers and fuel nozzles or assages extending abovethe level of the e1 therein, and its object is to provide an-apparatus of this character'in which the heavy particles of; fuel will be intercepted and in which the richness of the fuel may be closely deviceha'ving an outlet passage of standard sizeextending from the carbureting chamv ber in which the throttle valve is mounted,

the net cross-sectional area ofthe carbureting chamber'at the throttle shaft being equal to that of the outlet opening, and the carburet device having a shoulder at the plane where the discharge passage, connects to the am r.

It also'consists in the details of construction illustrated in the accompanying drawand particularly pointed out in the aims.

In the drawing, Fig.1 is a side elevation of a carburetor embodying thisinvention.

'Fi 2 is acentralvertical section thereof,

imilar reference characters referto like parts throughout the several views.

The bod of he carburetor is formed with e gassage 2, a float chamber 3, a

an air-int mixin cham er 4 in which is mounted a "throttle valve 5 on-ashaft 6 and a .fuel outlet. passage 7 surrounded by a flange 8. -The flbat chamber has afmovable cover 9' and a float 10 therein attached to the lever 12. Screwed intothe top of thefloat chamber is l a sleeve 13 which is providedwith a seat (not shown) for a valve 14 of any well known designtila small chamber 15 being mounted on e upper portion 16 ofthis sleeve and having a fuel sup 1y connection 17. The screw 18 holds this 0 amber 15 and the fuel screen 19 in position. A wall 23 separates the, air passage2 from the float chamber. This construction .forms no. part of the present invention.

A fuel passage 20 extends along the botconsisting with the' fuel nozzle.

m1. sis-151' is new.

seldom over thirty-. vehicle can negotiate, without the fuel flowfrom. the top of-theno'zzle. This w 1 be. less than that-of the'lin'eIX-Q drawninFig.2.

The. nozzle extends of a collar wardly" tapering p a flange 30, which posts \32 connected a 33'. Slidable b on the collar 28 and 32 is an air valve consisting of a cylinder 34 and perforated top '35. .Depending .36 having a' central opening 37 in hlinement K stem 38 is slidable held downby the "spring 39 and this stem connects (to a valve 40 slidable on the fuel nozzle 27. An arm '41 on the outside of the air-intake passage connects to the arm 42 within this passage and this second armcxtends beneath the curved upper end of the stem 38. Substantially no air can through the space between the nozzle and the inner wall of the valve 40.

The fuel outlet passage -7 is smaller in diameter than that portion 43 of themixing .chamber 4 through which *the shaft 6' ex-..

tends, so that this lower portion 43 will have. .as large anefiective area as the outlet 7..-

I have found that a carburetor has greater fuel capacity when the area oiE-the. assage by the throttle shaft 6 is as large as to area of the outlet 7. This outlet 7 could be bored out to the same diameter as is the passage 43 without loss offuel capacity, but the industries have standardizedthe size of the outlet flange 8 of the different sizesfof carburetor, and it is, therefore, not practical to properly match such bored out carburetors to the standard and besides, they would w be quite .likelyto leak air at these improperly'made joints.

I also have'foundat certain low speeds, on some motors, a decided mcrease of power can. be obtained' by. use of the annular shoulder 44, and that this advantage is se {which the motor I up into. theventuri 4 28 having. a down- 29 which ends at is supported by the from the'top'isa hub thro h the bottoni' of the air-intake p an isnormally ate, and

cured by having this shoulder at substantially any point between the throttle and the oint gwhere the intake manifold branc es. The probable reason is that the heavy fuel globules strike against this shoulder 44 and are broken up. 1

The opening within the flange 30 may be closed by the top of the spool 40 when that I reached.

claims.

is slid u byithe arm 41,'which reduces the air sup y which mayflow up around the nozzle 2 and creates a greater suction at the dischargeend of the fuel nozzle; In other words, the usual choke action is obtained .by swinging the arm 41. The air valve 34 re-' mains in its normal position and forces all the air to pass through the aperture in'the the nozzle so long as i flange and aroun the engine is running-at moderate s eds, but when the throttle 5 is opened sufficiently to cause enough suction to lift the airwvalve, the air will in part flow 'out laterall between the posts, 32 and not pass the disc arge end of the fuel nozzle. This will cause the explosive mixture tobecome much leaner for the higher speeds of the engine.

. Accidents have occurred because of light farm tractors'tipping .over backward when 20- -pulhng on mired lows and other heavy loads, the tractor wieels standing still and the niacliine simply windingitself up around I the axle.- To prevent this the intake 21 of the fuel passage '20 is'so positioned that when the carburetor is inclined until the line X--X of Fig. 2 is horizontal, the'intake 21 will be entirely above this line. This line indicates approximately the f el level when the carburetor is thus tilted and is a greater angle than the steepest hill thevehicle can climb. But this angle hardly half that V at which :the tractor fig:- over backward,

and'as the upward swin of the vehicle is always slow, the fuel supply to the-engine is cut off before the dangerous angle-is The details of construction and the proportions of the ,several parts'of this carburetor may allbe varied by those sln'lled in 40 the art without departing from the spirit of my invention as set forth in the following 1. In. a carburetor, a carburting chamber and a ring at the lower .end thereof, a plurality of posts extending upward from said, ring and a collar at the upperends of theposts, said collar having a downwardly tapering central vpassage and an inwardl extendin flan e at the lower end thereo an air va ve shdable on the collar'and comprising a cylindrical shell fitting around the collar and posts and aperforated head at the upper end ofjthe shell, :1 fuel nozzle ex- .tending upward above the flange inthe colthe fuel nozzle to reduce' the effective open- -1ng in said collar. 4 Y 2. In a carburetor, in c n; 1binat1on,.a fuel mixture outilet passage, a mixing chamber,

in the mixing chamber theeffective cross sectional area of said mixing: chamber at thethrottle shaft being substantially the" same as that of the fuel mixture outlet passage, said carbliretor being formed-with an annular shoulder extending at substantially. right angles to theflo'w of the fuel mixthe, nozzle'and adaptedto vary theefl'ective area of said central passage, andmeans' controlled by the flow of air throu h the central passageito regulate the ow of air through said radial assa v CHES lar, and a second'valve slidable relative to a at a circular p ate throttle'and a shaft therefor ges. R F. JOHNSON. I

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