US1750889A - Carburetor - Google Patents

Description

March 18, 1930. v. R. HEFTLER CARBURETOR Filed 00t- 26, 1922 NVENTOR @Ly/wi@ Patented Mar. 18, 1930 UNITED STATES PATENT OFFICE VICTOR R. HEFTLER, F DETROIT, MICHIGAN, ASSIGNOR T0 SOCIET DU CARBURATEU ZENITH, OF LYON, FRANCE, A. CORPORATION OF FRANCE Application led October 26, 1922. Serial No. 597,032.

The` present invention relates to carburet-l ors of the type adapted for use with internal combustion engines, and more particularly to improved structural featuresI whereby the manufacture and assembly of the carburetor is facilitated and improved operating results areobtained.

In the accompanyin drawings there is shown, for purposes o illustratlon only, a preferred embodiment of this invention, it eing understood that the drawings do not define the limits of the invention as chan es may obviously be made in the construction and operation disclosed without de arting from the spirit or scope of my roader claims'.

In these drawings,-

Figure 1 is a vertical sectional view,

through a carburetor constructed in accord- 20 ance with the present invention;

Figure 2 is a detail sectional view, on an enlarged scale, of a portion of the fuel feedinglmeans associated with the atmospheric we i Figure 3 is a detail sectional view on an enlarged scale, illustrating an improved fuel feeding means; and

Figure 4 is a detail sectional view of a modiedform of fuel feeding means.

In carrying out the resent invention, there is preferably provided a main body member 2 in the form of a casting. This member may be, if desired, constructed of a corrodible metal, such as cast iron, where- I by the cost of the construction is greatly reduced. Extending through the casting is the usual air inlet passage 3 which may be provided with an auxiliary air inlet control 4y of theA t e shown in m Patent` No. 1,418,259, of ay 30, 1922, an with a choke valve 5.

Extending through thewall of the body member 2 is a set screw 6 adapted to engage an opening in the casing 7 of a composite Venturi member. This venturi, while it ma be ofvanywell known construction, is pre /erably of the type illustrated in the copending application of Henri de Bolschevalier, Serial No. 595,878, filed Oct. 20, 1922, which y resulted in Patent No. 567,043, patented Dec.

retor and also ,makes the filter readily acces- 29, 1925. This forms a suitable mixing chamber, the outlet from which may be controlled by a throttle valve 8, as is customary in the art.

Projecting laterally from one sideof the member 2 is a shelf 9 provided with an opening adapted to receive a stem 10. This stem is preferably formed with an upper shoulder 11 and is provided with an intermediate threaded portion 12 adapted to coo erate with a nut 13. After the stem is sipped in plosition through the opening in the shelf 9 t ere is placed over the lower end thereof a supplemental cover 14 having a de ending iiange 15. This cover, after it is placed in position, is clamped against the lower .surface of the shelf by the nut 13.

The upper Vend of the stem 10 may be internally threaded to receive a screw 16, by means of-which the gasoline inlet 17 may be adjustably clamped in position. Surrounding the upper end of the stem 10 and enclosed within uthe casing formed bythe gasoline inlet, is a filter 18 adapted to remove any foreign'particles from the fuel before its passage into the longitudinally extending opening 19 in the stem. This construction permits the gasoline inlet to be readily ad- )usted as required in installing the carbu- 80 sible for cleaning and ins ection.

Intermediate its lengt and at substantially the point of intersection of the median horizontal and vertical planes extendingthrough the float chamber, is a seat 20 for a needle valve 21 longitudinally movable in the lower end ofthe stem. This needle valve is adapted to -be directly operated bg' a float 22 surrounding the stem and provi d with a'central cup shaped member 23, the bottom of which engages the lower end of the needle valve. By reason of this construction, it will be apparent that as the ioat rises. it will directly operate the needle valve to cut off the supply of gasoline, while as it lowers the re verse operation will take lace.

The main body of the oat chamber may comprise a suitable stampin 24 adapted to be clamped in position on a ase member 25 bV means of a hollow screw 26. The base 100 member, as disclosed in my copending application hereinbefore referred to, is prefera ly composed of non-corrodible metal, such as brass,whereby the action of the gasolinethereon and of the water contained in the gasoline supply does not tend to 'corrode or otherwise 'clog theA fuel openings. This base member may be secured to the main ,body member 1n any desired manner whereby it may be easily removed, as will be apparent.' The float chamber preferably has a c'over 27 carried by the stamping .24..and-adapted to be enclosed within the supplemental cover 14 when the parts are in assembled'position. 15.

The idea broadly of constructing a carburetorfof a main-body portion having a projecting shelf and a separable base portion,

pheric well 29 is located entirely within the' main body portion 2 of the' carburetor and is adapted to supply fuel to a quill 31 delivering fuelv for slow speed and starting purposes through a nozzle 32. The amount' of well to the 'cap nozzle 38. When the the atmospheric well has been exhausted,l

fuel in proportion to the air may becontrolled by a needle valve 33, asclearly shown in Figure2. For facilitating assembly, the upper 4end of the quill 31.may have a driven lit with a sleeve 34, which sleeve may be held in position by a bent clip 35. rI he atmospheric well may be open to the atmosphere through suitably arranged openings 36.

Formed in the base member 25 and extend- Aingfrom the atmospheric well to a point adj `jacent the main nozzle 30, is a-channel 37 45 adapted to feed. fuel from the atmos 'helaric' e 1n which occurs at a time comparatively early in the operation of the carburetor, a mixture of air and gasoline I'will thereafter be supplied? to the `cap jet.

In'order tov obtain the advantagesof the flow through yan. opening in a relatlvely thin member, as disclosed,l for example, in my Patent No. 1,255,165, of February 5, 1918, the

body portion of both the: atmospheric well..

and the main nozzle is formed adjacent the `lower end with an inwardlyo' projecting shoulder 39 and a peripheral flange 40. During the manufacture of the parts, disks 41 are laced against the shoulders 39 and within t 'e peripheral flanges, and the flanges are then turned inwardly to tightly clamp the disks in, position. 'With, this construction vitis unnecessary to provlde a separate pe;

f removability.

cilitated. At the same time, this construction prevents leakage of gasoline around the disks,

thereby necessitating a determinate flowv .through the calibrated openings provided 1n.

th'e disks forthat purpose.

In some 'casesit has been disk has a tendency to buckle, thereby changing the flow characteristics-of the calibrated ripheral'envelope for'enclosing the disks, and the assembly'of the carburetor is greatly fafound that a flat orifice. -This may beeasily overcome by the modified construction illustrated in Figure 4. In this form, the calibrated opening 42 is `formed in the disk shaped portion ofta cupshaped blank v43. yBy knownJapparatus, such as a compound die, the cups may be simulvtaneously cut from a body of metal, drawn, and pierced. This cup maythen be secured,

as by soldering, within'a suitable holder'43.

In this construction'thereis an inwardly projecting shoulder 44 and a peripheral liange 45, there being a fuel feeding passage 46 through the body of the holder.

The advantages of the present invention arise from the improved construction whereby it is possible to'locate the atmospheric well entirely within the4 carbureting passage while maintaining all of the advantages of Further advantages arise from the improved meansfor holding4 the `disksin position within the fuel feeding devices.- Iclaimz' 1. In a carburetor, a main body having an air passage therein forminga mixing chamber extending completely through the body 'in' one directlon, abasesecured to said body and having a fuel 'passage therein, said base closing the through extension of said passage, a float chamber exteriorly of the mixing chamber and communicating with said fuel passage,- an atmospheric well` physically inside of the walls of the mixing chamber and com municatin with said fuel passage, and

lmeans for dellvering'fuel from said well to said mixing'chamber,'-said well being bodily removable lfrom said base.

2. In a carburetor, a main body having an' air passage therein forming a mixing cham ber extending com letely through the body 1n one dlrection, a ase secured to said body and', having a fuel' passage therein, said. base y closing the through extension of said passage,

a float chamber exteriorly ofl the mixing.V

chamber and communicatin with said fuel passage, an atmospheric wel physically inside of the walls of the mixin chamber and communicatin with. said fue passage, and means dispose vlaterally of said well and carried by said base for delivering fuel from said well to said mixing chamber, both said well and said means being bodily removable fromv 3. In a carburetor a main body having an 'air passage therein .forming a mixmg/cham-/H/ Macnee ber extending completely through the body in one direction, a base secured to said body and closing the through extension of said passage, an atmospheric Well carried by said base and located physically inside of the Walls of said mixing chamber, fuel feeding means Within said mixing chamber carried by said base and disposed laterally of said Well, said means being operatively connected to said Well, and a separate fuel supply for said means, said Well and said means both being removable from said base.

4. In a carburetor, a main body having 'an air passage therein forming a mixing chamber extending completely through the body in one direction, a base secured to said body and closing the through extension of said passage, an atmospheric Wall carried by said base and located physically inside of the Walls of said mixing chamber, fuel feeding means Within said mixing chamber carried by said base and disposed laterally of said Well, said means being operatively connected to said Well, and a separate fuel supply for said means, said Well and said means' both being removable from said base and said operative connection between said Well and said means being freely accessible upon and by removal of said Well and means.

5. In a carburetor, a main body having an air passage therein forming a mixing chamber extending completely through the body in one direction, a base secured to said body and closing the through extension of said air passage, a removable atmospheric Well carried b said base and located physically inside o the Walls of said passage, a fuel feedl ing means Within said passage positioned laterally of said atmospheric Well, said fuel feeding means being operatively connected to said Well, means operative for feeding a substantially constant supply of fuel per unit of time to said Well when free of accumulated fuel irrespective of engine suction, and separate fuel feeding means cooperating with said well and discharging into said passage.

In testimony whereof I have hereunto set my hand.

VICTOR R. HEFTLER.

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