US1131312A - Carbureter. - Google Patents

Description

W. D. BEAMER &, J F. DUFFY..

GARBUBETR.

APPLICATION FILED DBG. 2s, 191s.

Patented Mar. 9, 19M).

2 SHEETS-'SHEET l.

0i! opening; between um' 0 e E @l fthe '1' M1011 we t@ f lmvension This we varying; mndfms ai? @my unil As stated, the primary object ofthe present invention is to secure a proper lmixture under the varying conditions, of operation 'of the engine. This is done by changing the areaof the. throat of the'venturi'iircorrespondence to the size of the opening-'at the oint of discharge from the venturi.

The control forv the dischargeof the veli` tur' in the4 construction shown consists. ofthrottle valve members 28 and 29 which are of a cylindrical character, and each ofy the` valve members is provided with al semi-'cir-F cular. opening. The openingin the valve member 28 is designated b the numeral 30,' and that .in the member 2 by the numeral 31. '-As shownin Fig. 2,when these open. ings are brought in direct opposedkrelation to one another, an opening of maximum size is provided at the ischargeoftheYenturitube. The walls of the openingsBO and 31 are slightly beveled, 'as shown in Fig. 2, to con'ornl to the taper'. of the venturi.

In the construction shown, Aeach 'of the members 2.8 and 29 'has a iiattened portion as :it-32 Vto provide the'necessary engaging surface when they are brought together, and to obtain tlie'desired fit between the members when they are brought together, which fit would be diiicult to obtain if the members were entirely cylindrical. Each ofthe members'28 and 29 aremounted to rotate in the casing `16, as better shown perhaps in Fig. 3, and the member 28 is provi ed with trunnions 34 and the member 29 Withtrunnions 35, the members beinlockedin place',

in the 'construction shown, y plates36 and 37 secured in any suitable-manner by detachable .fasteners to the body of lthe casinic.

he means for varying the'area of the throat of the venturi is shown perhags more clearly .in Figs. 2 and 4. These mem designated by the numerals38 and 39 and are similar in formation to one another, and one ofrtliem is shown in elevation in Fig. 5 oli'trie -drawings. These members consist of body l40 cut away to provide an opening 'llsaid opening being of a tapering character and of less width at'the top 42 than at the bottom 43, and what may be termed the rear wall 44 of the opening is of a convex nature, as will be seen in Fig. 2; The side walls 45 of the opening 41 are shown more clearly in Fig. 5, and as' will be seen are of an undulating diverging character from top to bottom giving to the opening'tlie property of tapering from top to bottom. As shown in Fig. 2, one of these members lies upon eacli side of the throat of the venturi and may be said to constitute the walls of said throat. The members are mounted to rotate within the casing 16 and are locked GTS are n A connection is provided between the to the trunnion 35 of the member 29, which;

-cranks are connected by a link 48, a -crank "49 joined to the trunnion 50 of the membe 38, anda crank 51 joined to the trunnion 52 of the member 39.- The last two mentioned" cranks are connected as at 53 in Fig. 1 by la slot and pin connection. The crank 51 Aisattached to a link 54 which is adjustable inl and out to vary the relative positions be tween the cranks 51 and 49 as respects the);`

cranks 47 and 46, the reason for which will! be more clearl hereinafterexplained.. It isexpressly un erstood, however, that theforegoing 4described connection between the members 28, 29 38, and 39 only describes `one method of o taining a practical connection between these members and this particular connection may be changed w itlio 1.it` 4 departing from the spirit of the present iii-1 vention. The connection above described constitutes one means for actuatlng the 'members'28 and 29 simultaneously with the,

members 38 and 39, and any suitable means maybe provided Afor actuating thisconneo tion from any convenient'or desirable location that is proper.

The foregoing constitutes a description of' the elements and parts which form the meenanism of' the present invention. We will now refer to the various positions assumed lby these-parts, which will be clearly under# stood, it is thought, from a study of Figs. 6

sitions assumed in a diagrammatic manner.' Referring first to Fig. 7 as there shown, the

to 15 inclusive, which show the various pomembers 38 and 39 have been'moved to a position whereby the area of the throat of the venturi is of a minimum size, and the opening in the 'throat is indicated by the numeral 55. The members`28 and 29 have been moved so that therey is but a slight opening 56 between them, and the discharge end 'of the venturi is thus nearlyl closed. A'lhi'sposition o the Lparts is brought about when the, engine is i' line' running as slow as possible without any load. In this position, the size of the opening 55 through the Ythroat of the venturi is cut down, and the opening 56 being restricted, there will be but a small suetional `force .exerted in the venturi.- Therefore, the q'uantity of air forced through the venturi will be That is, simply relatively' small. This small suctional force V draws out a relatively small quantity -of gasolene, thus producing a relatively small quantity of mixture of the desired proportions of gasolene and air. To summarize, there will be a suctional force exerted at the discharge end of the nozzle 22 capable of 130 openings will be increased and --more gasolene and airsupplied than inthe two. previous instances.

'grasoleneto air, however, will remain the chewing 'some gasolene thereiroi'n, while the an unt oit air with which saidl gasolene is mijn will be relatively small, whereby a re will result which will be ,ont the ier proportions of gasolene and air, but which will be of a relatively smally quantity asis rllhis is the quantity of mixture Awhich, is'desired under these circumstances. 'llhe relation of the opening 55 to the opening 56 is also shown in Fig.. 6.

lrlow referring to Figs. 8 and 9, the parts controlling the-area of the Venturi throat :ind the point of discharge of the venturi are shown in, a position they would assume when the engine is running under a light load. Under this condition, it will be observed that the partsare so positioned that the size of the opening at the throat of the venturi indicated' by the numeral 57 is somewhat increased over the size of the opening 5.", and that the size oif` the opening 56 between the members 28 and 29 is increased over the size of the opening 56. Under these conditions, there will be a greater suction exerted in the venturi owing to tie increase in the size oic the opening 58 the throttle. rlhere will. thus be a greater amount oit suction exerted in the venturi than in the ease oit 6 and 7. lt will be also observed that the area of the throat of the venturi has been increased. Therefore, there willl be e greater volume of air passing tlfirough the venturi, and there will be a greater suctional force at the discharge end of the gasoleim nozzle. There will thus he more air and more gasolene drawn through the venturi than in the case ot Figs! 6 (and 7. The proportion olf air to gasolcne, however., will he the same to all practical` purposes, and the increase in the size ol:` the throttle opening and the size ot the throat oi:1 the venturi will merely result in a greater quantity of mixture being supplied to the engine, although the mixture will be sub stantially the saine proportion as ini the case of Figs. 6 and 7. 4

Now referring to ltigs. l and l1 with the parts in this position, the load on the engine has been increased. lllhe opening at the throat of the venturi is indicated by the numeral 59, and the opening at the point of' discharge of the'ventuii is indicated by the numeral 60. llliider these cc .ditions, both there will be The relation of same 4to all h u practical purposes, andv hence t ere wi l be simply an increase in the vol' into the cylinder; of the engine. i

Referring to Fi e. 12 and 13, the opening in the throat of tie'venturi is indicated by the numeral. 6l, and t e openin et the point` of discharge oit the venturi, or the accomplish this, in the structure shown, a

'readily understood there will be a still greater quantity of mixture supplied into the engine than in any previous instance,

but the mixture will be of the same general so proportions as. respects air and gasolene.

It Will vthus be apparent that by the arrangement of the mechanism described, various quantities of mixture are supplied to the engine as is needed in correspondence to the load which the engine is carrying. rllhe character of the mixture remains substantially the same. That is, the correct character for eilicient combustion.

lt has been found in practice thatvcarbureters require a diii'erent adjustment in cold weather than in hot weather.; that is, they should be adjustedtto accommodate themselves to different climatic conditions. To

member 65 is employed which is simply a thumb-screw, and which acts to torce the link 54 back and forth changing the relative positions oit' the cranks 51 and 49, as respects the cranks 46 and 47, whereby the members 38 and 39 are adjusted to change their relau tion; that is, the members 88 and 39 are moved in a manner whereby the opening, through the throat of the venturi, is changed independent` of any change in the throttle opening. This will give the desired proportions oil-air to gasolene and will produce the desired mixture.

A suitable means of connecting the link 54 with the crank 4'? is illustrated in Figs. il@ 16 and 17 and consists 0I" a piii'66 whifch is carried by the crank and enters a curved slot 67 in the link 54. The curve of this slot is preferably struckl on a radius from the axial center of the crank 47. The threaded 'stem 65 extends through an upper enlarged head upon the pin 66 and this stem has a nger piece which rests against a lip 68 ex tending from the link 54. When the link 54 moves it will move the pin 66 owing to V.120 the connectionbetween the stem 65 and the pin, and the stem 65 and the link, and yet an adjustment can be readily made of the crank 47 without ad'ecting the position of the link 54- and crank 51, owing to the slot 67.

By the configuration employed in the members 36 and 39, said members, when turned to their various positions, always cot- Jo erate to maintain a curvilinear wall about t e throat ont the venturi which allows the 1. In a carbureter the combinationl of a without ur.-

casing having a passage therethrough embodying a Venturi tube,'a nozzle having its open end loca-ted adjacent the throat of saidl tube, means for controlling the outlet from said passage, means for varying the area of said Venturi throat, a cranli for operating said outlet controlling means, a crank for operating said throat area varying means, a link connecting said cranks* and means for longitudinally moving said link to adjust the position of said `throat area varying means independent of actuating said outlet controlling means whereby a mixture is produced in accordance with the climatic requirements, substantially as described.

2. In a carbureter the combination of a casing having a passage therethrough embodying a Venturi tube, companion rollers mounted in the walls of said passage and lying partially within said walls and partiallywithin said'passage, each of said roll- Y. ers being cut away to forni an opening therebetween,` the walls surrounding said cut-away portion'being configured to form. the throat of the Venturi tube, and to form a portion of the lwall of the passage when the rollers are moved to establish the maximum throat area,`means :for actuating said rollers in unison te vary the size of the Venturi throat area, a spray/nozzle extending' into the opening between the rollers, means for controlling the manifold end of the casing passage to'va-ry-the arca of the passage at that point, and a connection between theroller actuating means and manifold end controlling means to operate them in unison, substantially as described.

In a carbureter the combination of a casing having a passage therein embodying a Venturi tube, companion rollers mounted in the walls ot' said passage and lying partially withinl said passage, each of said rollers Vbeing cut away at oppositely disposed points to form an opening between the roller?,r said cuts producing concave-convex Walls'y about said opening, the convex portion forming Throat ol1 said Venturi roller actuating means and manifold end 'controlling vmeans to operate taein in' unitube, unison throat openir into the open :tor controlling the manifold er ing" passage to vary the at that point, and a connection b ine? cut au/ay at onoositelf u.. Jos a 1 w ll .l l l te torni passage therebetween, f' 1o producing concave ing said roller 'p tion forming tl] width oit the cuts abo being less than the Width of the i the convex portion, means for er said rollers in unison. to vary the Venturi throat, a spray no1-:ale into the' openingl bett. `en the rollers, means for controlling the manifold end ot t ing' passage to vary the area ot the pc, at that point, and a connection between roller 'actuating means and manifold controlling means te operate them in son, substantially as descriled. si;

5. in a carburetor the combination, oil, t, casing having a passage there bU1 i a Venturi tube, companion ro portions thereof confngureY throat of the Venturi p. n rollers located adjacent the mai said passage and mounted in t'* the passage and extending parti *p said walls and partially within said p sage and cut awaytoforin the maniii 4 sage-oiE the casing, and a connection be.JY tbe rollers located at thetl'i turi and the rollers locatedadiacent the manifold end of the ease passage whereby they are operated in unison to vary the area in of the throat and simultaneously vary the area of the manifold opening, substai'itially as described.

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