US2372332A

US2372332A - Charge forming device

Info

Publication number: US2372332A
Application number: US350517A
Authority: US
Inventors: Frank C Mock
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1940-08-03
Filing date: 1940-08-03
Publication date: 1945-03-27
Anticipated expiration: 1962-03-27

Description

March 27, 1945. c, MQCK 2,372,332

CHARGE FORMING DEVICE Filed Aug. 3, 1940 4 Sheets-Sheet l IN VEN TOR FRANK C. Mac/c 6Q ATTORNEY- March 27,1945. F c. MOCK 2,372,332

CHARGE FORMING DEVICE Q I Filed 'Aug. 5, 1940 4 Sheets-Sheet 2 45 1 44 64 4a u 29 50 46 I 6 INVENTOR I FRANK 6. Mean March 27, 1945. I c, MOCK 2,372,332

CHARGE FORMING DEVICE Filed Aug. 5, 1940 4 Sheefs-Sheet 3 *TO ATMOSPHERE OE VENTUE/ SUCTION TO All? INLET 02. I22 o-rHse souece 01-- A12 J60 I32 I 424 H4 H2 H 128 l I 9 /26 12-1 I flu [J "MW H6 ATTORNEY March 27; 1945. F, c, MOCK 2,372,332

CHARGE FORMING DEVICE Filed Aug. 3, 1940 4 Sheets-Sheet 4 TO VENTURI SUCTION O2 ATMOSPHERE I S 236 gga 226 FGJB INVENTOR FRANK C. Moe):

ATTORNEY Patented Mar. 27,, 1 945 CHARGE FORMING DEVICE Frank C. Mock, South Bend, Ind., asaignor to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application August a, 1940, Serial No. 350,517

(01. zen-23) 23 Claims.

This invention relates charge forming devices, primarily ofthe pressure feed or injection carburetor types, and is particularly concerned with the provision of fuel discharge nozzle arrangements which are adapted to disperse anddistribute the fuel through the air flowing through the induction passage.

With the continuous development of larger and larger internal combustion engines, particularly for aircraft use, the problem of obtaining uniform distribution of fuel and air to the individual cylinders of the engine has grown increasingiy difllcult. For aircraft use it has been found desirable to use a carburetor of the pressure fuel or injection type in which the fuel is maintained under superatmospheric pressure to decrease thetendency of the fuel to boil prior to its delivery into the engine manifold; and furthermore, to inject the fuel. into the manifold posterior to the engine throttle to prevent throttle icing, Both of these arrangements aggravate the problem of distribution and dispersion of the fuel, theflrst tending to result in the delivery of-a solid stream of fuel to the air stream and the latter eliminating the fuel break-up efl'ect which is normally experienced in a posterior throttle carburetor as the fuel passes the throttle valve. Furthermore,

the increased engine size has resulted in largerinduction passages to accommodate the larger quantities of fuel mixture now required. To ob-- tain uniform distribution of fuel'through an induction passage having a large cross-sectional areais obviously more difficult than with one of small cross-sectional area.

In addition, engines often have peculiar distri- Under such conditions it is desirable that the carburetor be able to deliver the fuel in a nonuniform manner to ofiset the other effects so that v bution characteristics resulting from valve timthe mixture received by the individual cylinders is of a uniform richness.

It is accordingly an object of my invention to provide a means whereby the fuel delivered to the air streannmay be so distributed that the individual cylinders receive mixture of a uniform richness.

Another object of the invention is to secure uniform fuel distribution to the individual cylinders with relatively simple devices of high efficiency and consistent performance.

one skilled in the art from the following descrip tion and appended drawings in which:

- Figure 1 is an elevational view partially in section of a charge forming device embodying the invention, the portion in section being taken on the line l-i of Figure 2;

Figure 3 is a bottom view of the charge forming device of Figure 1;

Figure 3 is a sectional view taken on the line 3-3 of Figure 2; e

Figure 4 is a bottom view of a charge forming device embodying another modification of the invention, a. portion of the fuel tube being broken away;

Figure 5 is a partial view in section taken on the line 5-5 of Figure 4;

Figure 6 is a sectional view of the fuel discharge bar taken on the line 6-6 of Figure 4;

Figure 7 is a sectional view similar to Figure.

6 of a modified form of fuel discharge bar;

Figure 8 is an elevational view in section, on

the line 8-8 of Figure 9. of another modifica- Figure '10, is a vertical section through a fuel nozzle adapter section embodying another modification of the invention, Ill-Ill of Figure ,11;

Figure 11 is a bottom view of the adapter of Figure 10;

Figure 12 is a sectional view taken on the line l2--l2 of Figure 11; and- Figure 13 is a sectional view taken on the line "-43 of Figure 11.

With particular reference taken on the line to Figure 1, there is disclosed a charge forming device of the pressurefeed type, such as is more particularly described in my copending application Serial No. 202,206, flied April 15,1938; having an air inlet or scoop section I 0, a body section l2, a nozzle adapter section II and a fuel regulator indicated generally at. It. The main body section includes a pair of air passages or barrels l1 and l8, each of which containsa large venturi 20, a a

primary venturi 22 made. throttle 24. An annulus fl is provided in the small venturi If and communicates with the regulator I 6 by passages not shown. Tubes II in theventuri 2e are subjected to air entrance pressure and 8.150 communicate with the regulator it. The Venturi euction and air scoop pressure are utilized in the regulator to control the quantity of fuel delivered to the conduit so, leading to the adapter fsection l4, as is particularly described in the above copending application. Passages fl and I! connect the Venturi annulus It with a chamber fl (Figure 3) within a nozzle cap 34. A conduit II connects the air inlet It with a passage 36 in the adapter section l4, transmitting'air thereto for reasons which appear, hereinafter.

The adapter i4 is preferably formed with the separate barrels l1 and is extending therethrough although it may have a single elongated passage if desired. The mat rial between the barrels is milled out as indicat d respectively receive the nozzle cap 84 and the lower portion of the dischar e nozzle assembly indicated generally at 40. The adapter section is adapted to be attached by means of the flange 42 to an engine intake manifold generally having a single elongated opening into which the barels l1 and I I discharge.

The portion 44, Figure 3, between the barrels f the adapter is bored to receive a valve body 45 having a valve seat 46. and forms therewith an annular chamber 41 which receives fuel from the conduit 19 through a p ssage 4| and delivers it to the interior of the bo y 4| througmports 49. The body 4! slidably receives a valve ll of flat-sided stock having a tapered portion ll adapted to cooperate with the seat 4|. A diaphragm 52 is secured at its centralpportion to the valve 50 and is clamped at its outer edgebetween the cap 34 and the body". the parts being secured to the adapter by cap screws 54 to form a fluid-tight assembly. A compression at It and it to spring It urges the valve It against the seat 40. v

A substantially X-shaped member II is bored to receive a nozzle cylinder "and forms therewith an annular chamber I! which communicates through assa e 04 with the passage It leading to the air inlet? Cap screws 80 secure the member 80 and cylinder '82 to the adapter-portion 44, gasket 61 and packing 88 being provided to maintain the assembly fluid tight. A piston 10 is slidably received in the cylinder 02 and is urged against ashoulder therein by a compression spring H- acting between the piston and a can If threaded into the end of the cylinder .2. The member ill has four arms 14. II, ll, 11

which extend transversely of the induction passage and are curved inthe longitudinal plane of the induction passage. from base to tip. in the direction of air flow. as best shown in 1"igure 3, and are also curved in the transverse plane of the induction passa e as best shown 'in Fllure 3- The arms have *a cross-sectional contour as indicated in the revolved section at It of Figure 8. The relatively flat leeward surfaces of the arms shield the region in the immediate lee of the arms from direct air currents.

Fuel dischar e orifices 80 are provided in the cylinder If above the shoulder againstwhich pistdn 10' seats and are positioned in the immediate lee of each of the arms of the X member and are adapted to discharge jets of fuel longitudinally or and in the lee of-the arms. Fuel oriq i'ices 82 of larger diameter than orifices II are similarly positioned with respect to the arms but arelocated below the shoulder to be.

assess:

uncovered by the piston as the quantity of fuel discharged increases.

During operation at idle or at low fuel flow, fuel under pressure is delivered by the regulator I! to the interior of nozzle body 45 through the conduit 30, passage 48, annulus 41 and ports 40, The pressure of the fuel within the nozzle body acts on diaphragm Bland urges it upwardly to open the valve 5| in opposition to the spring 58. Since the diaphragm area is relatively large compared with the area of valve seat 48, the valve li' maintains the fuel anterior to the seat at a predetermined and substantially constant pressure unless modifled by means hereinafter described. Fuel under pressure therefore passes the seat 46 into the cylinder 62 and discharges through orifices 80 in the lee of the arms of the X member, the arms shielding the jet of fuel from direct air currents and allowing it to carry transversely in the induction passage.

As the fuel flow increases, the fuel pressure acting on the piston 10 increases and urges it downward against the spring Ii to uncover the discharge orifices 82, thus providing additional area for the discharge of fuel. This arrangement results in a forceful ejection of fuel at low flows, in contrast to the dribbling of fuel which would occur if large discharge orifice were used, without requiring an excessive pressure at high fuel flow as would be necessary if small discharge holes were used. i

The chamber 33 in nozzle cap 34 may be vented through passage 82 to the atmosphere or if desired to the Venturi annulus 28 through passage II, as shown in Figure 1. 'If vented to atmos-. I

, creases.

At idle or operation at small throttle openings there is very little air flow through the passage and if it were not for the curvature of the arms of the X member in the longitudinal plane the fuel discharged from orifices It, being shielded from direct air current by the arms, would carry substantially across theinduction passage and deliver too great a portion of the fuel to the outer periphery of the barrels. Due to this curvature of the arms, the fuel jet impinges against the leeward surfaces thereof and isbroken up into smaller particles, 9. portion of which will be carried away by the air stream. The balance of the fuel, due to its inertia, iiows along'the leeward side of the bar and is carried 01! of the edges of the bar throughout its full length by'air. currents which will be presently described. By controlling the curvature of the :arm the fuel may be made to impinge against the arm at a point spaced any desired distance from the center or body portion of-the X member, thus preventing too great a portion of the fuel from carrying to the outer periphery of the barrel.- To further assist breaking up the fuel at low rates or air flow, air discharge orifices 84 are provided which receive air from the air inlet through conduit II,

passages '88, and annulus 63 and direct it across the path of the fuel discharged from ori- The arms of the X member protrude into the air stream of the induction passage and because they are flat on the lee side cause a region of backwash or retrograde currents in the lee of the arms. Thi region of low velocity air is a high pressure region and air moves continuously from the center of this,region'to the high velocity, low

. pressure regions at the edges of the arms. In

A this manner a continuous movement of air is pro:-

duced which carries with it fuel delivered into the shielded region. The arms, however, shield the fuel from direct air currents and allow it to carry transversely of the induction passage and be delivered into the. air stream over the full length of the arm. By controlling the width of the fiat leeward surfaces the amount of retrograde currents, which accomplish the tearing away of fuel from the bar, may be controlled.

The same movements of air occur at the portions of the arms which are inclined from a transverse plane of the induction passage.- However, when the retrograde currents reach'the edge of the arms, they are not swept away by stream flow which is at right angles to the member, but rather by stream fiow which has a substantial component in the direction of the arm. The lee currents thus tend to carry along the member and carry the fuel with it. Due to these effects fuel ejected upon the inclined portions of the arm.is carried along the bar and is taken off as it progresses, thus resulting in.a delivery of fuel to the The operation is much like that of the X bar. The relatively quiet air under the finger-like projectiorfs 82 allows the discharged fuel to travel substantially the length of the projections. Air currents which swirl from the center of the lee area to the edges of the members carry with them portions of the fuel and deliver it to the main air stream.-

The rake may be readily adapted for use in induction passages of any shape by varying the lengths and widths of the projections 92 as well as the length and shape of the tubes. These rariablestogether with the size of the individual fuel orifices, may be adjusted to give any desired fuel distribution pattern, thu compensating for any distribution peculiarities of the engine or its induction passage.

In Figure 8-. the nozzle adapter section H0 is of t e elbow type having an elongated cross-section at its upper vertical flange 2 which is adapted to receivea twin barrel body H4 of a'charge forming device. The cross-section of the adapter progressively changes from an elongated section at the vertical flainge to a circular section at the lower horizontal flange II5, the latter being adapted to be connected to the intake manifold of air stream along all of the edges of the arms of the X member. a Thus the width of the arm at its various sections, the contour of the arm in the longitudinal plane, and the size and direction of the air orifices may be varied to give any desired characteristic of fuel distribution to the air stream along the length of the arm. Furthermore, by varying the curvature of'the arms in the transverse plane. as shown in Figure 2, the distribution'of fuel to the induction passage may be further controlled. Thus by controlling these variables the distribution characteristics of the carburetor may be adjusted or varied to compensate for other distribution peculiaritie of the efigine to thereby accomplish uniform distribution to the individual engine cylinders.

The rake type of fuel discharge bar shown in Figures 4. 5, 6 and 7 operates on substantially the same principle as the X type of jet{ The rake is comprised of a central body 85 which is adapted to be bolted to the adapter portion 44, as shown in Figure 4 and 5, and has tubes 81 and 88 secured therein which project transversely into the induction passage. The tops or leading surfaces of the tubes are fiatted, as shown in Figure 6. and have fiat plates v88, 80 soldered or welded thereto. The plates have a plurality of fingerlike projections 82 extending transversely of the induction passage and at substantially right angles to the tubes. Fuel discha'rge orifices 04 are provided in the tube in the immediate lee of each finger-like projection and discharge jets of fuel transversely of the induction passage. The

orifices 94Jas shown in Figures 5 and 6.'preferablycommunicate with the interior of the tube 88 ad- ,iacent its uppermost portion so that vapor will be drawn through orifices 84 as it forms, rather than after it has collected in large bubbles. The finger-like projections may be bent in the direction-of air flow whereby the fuel will impinge against the leeward sides thereof, and/or may be formed integrally with the tubes, as by casting, as shown in Figure 7.

an engine. A web 6 is cast in the adapter and contains a bore IIBtherethrough having enlarged upper and lower portions H8 and I20. A fuel control valve assembly is secured to the adapter H0 by means of bolts I22 and comprises a nozzle body I24 having a shouldered aperture there-v through in which a long sleeve I26 is secured by means of nut I21 and packing I28. A long valve member consisting of a lower tapered portion I80, a tube I3I, and an upper member I32, cooperates with a seat'l84 in the lower end of the sleeve I253.

The valve is connected at its upper end to a diaphragm as in the previous modifications, the

chamber above the diaphragm being vented either to atmosphere or Venturi section. The lower and upper portions I and I32 of the valve member have enlarged fluted sections I86 and I3] to guide the valve in the sleeve I26.

A fuel discharge member I40 having four prong or finger-like extensions I42 is secured to the lower surface of the web IIB by bolts I44. The extensions I42 have flat leeward surfaces and a cross-sectional contour as indicated in the revolved section at I45 of Figure 9. A central chamber I48 in the member I40 slidably receives the end of sleeve I26, forming a fluid-tight connection therewith by means of the packing I48. Fuel discharge tubes I50 are provided in the lee of each extension I42 and communicate with the chamber I481 The tubes may be directed parallel to the extensions if, desired, or-at an angle toward the extensions whereby the fuel' discharged will impinge against the fiat leeward surfaces, or even at an angle away'from the extensions. An annular chamber I52 is provided in the member I40 which receives air from the air inlet through a conduit I54, passage I55. an annular chamber I55 between the sleeve I26 and the walls of bore H8, and enlarged chamber I20 and discharges it through air discharge orifices I58 across the tips of the tubes I50. g

During operation; fuel is received from the regulator through passage I60 and passes downwardly within the. sleeve I26. past the fluted sections fuel discharged by the tubes from direct air cur-' rents and create retrograde currents which willdeliver the fuel to the air stream over the full length of the projections, as has been previously explained.

The adapter section 2| 8 of Figure 10 is adapted to be connected to a twin barrel main body 2| 2 and deliver into an induction'passage having a single elongated passage. The fuel discharge bar 7 comprises a central body portion 2 having two laterally extending bars 2i8, 2l8 formed integral therewith and is secured to the side wall of the adapter. The bars 2i8, 2l8 are of a streamlined shape, as indicated in Figure 13, but have lateral projections 2 II at spaced distances along the bars of a contour best shown in Figure 12. The finger-like extensions 2l8, MS of the projections 2i! have fiat leeward surfaces 228, 22L Afuel control valve assembly comprising a cap 222, a body 224 having a sleeve-like extension 228. including a valve seat 228, and a valve stem.assembly indicatedgenerally at 288 is connected to the adapter by bolts 282 which extend through the wall of the adapter and are threaded into bosses 284 of the discharge bar body. The sleeve 228 is received within the body portion 2 and forms a fluid-tight connection with a cup-like member 288 by means of packing 228. Small a fuel passage 244 extending longitudinally within the bars H8, H8. A piston 248 within the cup member 288 is spring urged-to the right and closes port 242 at low rates of fuel fiow but uncovers it as the fuel flow increases.

As shown in Figure 12, a vertical passage 288 is provided in each of the projections 2i! which communicates with the fuel passage 244 and is plugged at its lower end. Inclined passages 282 intersect the passage 288 and have tube-like projections 284 which discharge fuel in the lee of the fiat, surfaces 228, 22L Air discharge passages 288 are provided in each of the pr0jections2l'l to direct a jet of airacross the path of the fuel discharged by the tubes 284; The passages 288 communicate with an air passage 288 extending longitudinally within the bars 218, H8. The passage 288 receives air through passage 288, annular chamber 282 surrounding the sleeve 228, and a conduit 284 leading to the air inlet or to any other source of air having a pressure greater than that within the induction passage. The air flow through the chamber 282 thus cools the fuel flowing through the sleeve 228, as was described in connection with Figure 8. g s

During operation fuel is received from the regulator through conduit 218 and passes through the sleeve 228, past the valve seat 228, through ports 248, 2 and 242, into the passage 244, into passages 288 and discharges through passages 282 and tubes 284 in the lee of the finger-like extensions 2l8, ,2". As previously explained, the flat surfaces 228, 2 shield'the fuel from direct air currents and create retrograde currents which full length of the projections 2 l8, 2l8. By varying 'thelengths of the finger-like projections 2 i 8, 2 l 8,

the size and: direction of the discharge tubes 284,

the spacing of the projections 2" along the bars 2. 2", and the size and direction of the air discharge jets 288, any desired distribution pattern may be obtained.

Although the invention has been described with reference-to several particular embodimen it will be readily apparent that various feature of I the several embodiments may be combined or changes made in the form and arrangement of the parts without departing from the spirit of the invention.- It is not intended that the scope of the invention shall be limited to the forms shown or otherwise than by the terms of the appended claims. v

I claim:

1. In a charge forming device, an induction passage, a throttle in said passage, a plurality of members having substantially fiat leeward surfaces extending transversely within the passage posterior to the throttle and terminating at points spaced from the wall of the induction passage, fuel orifices adapted to discharge jets of fuel transversely of the induction passage in the immediate lee of said members and in a direction along and generally toward the ends of said members, a fuel conduit for supplying fuel to said orifices, and a valve responsive tofuel pressure for controlling said conduit.

2. In a charge forming device, an induction I passage, a throttle in the passage, a member positioned posterior to the throttle and having a plurality of projections extending transversely of the induction passage, said projections having .fuel to said orifices, air discharge orifices adjacent the fuel discharge orifices positioned to discharge jets of air in indirection to intersect the path of the fuel discharged ,by the fuel oriflees, and means for supplying air to said air r discharge orifices.

3. In a charge forming device, a body having, an induction passage therethrough, a support on the body, a plurality of members extending transversely'of the induction passage connected to said support and terminating at points spaced from the induction passage wall, fuel discharge orifices adjacent said support and positioned to discharge fuel in jets transversely of the induction passage in the immediate ice of said members along lines intersecting the leeward surfaces of said members, a conduit for supplying fuel to said orifices, and a spring loaded valve adapted to open in response to fuel pressure for controlling said conduit.

4. In a charge forming device, body means having an induction passage therethrough, a throttle in the passage, 9. member mounted on said body means and having a plurality of fingerlike projections extending therefrom transversely of and only partially across said induction passage, said projections having substantially fiat leeward surfaces, fuel discharge orifices adapted to discharge jets of fuel transversely of the induction passage -in the immediate lee of said projections; means to supply fuel under' positive pressure to said orifices, air discharge nozzles positioned to discharge jets of air which intersect the path of the fuel discharged by the "intersecting the path extending substantially across said asvasaa said fuel discharge orifices-and means for sup- I plying air to said air discharge nozzles.

only partially across the induction passage and being inclined from support to tip in the direction of air flow, said members having substan= tially'fiat'leeward sides, and orifice means adjacent the support adapted to discharge jets of fuel transversely of the induction passage in the lee of said members along lines which intersect the leeward sides of the members.

6. In a charge forming device, means defining an induction passage, a throttle therein, a substantially X-shaped member supported in the induction passage posterior to the-throttle and having its arms projecting transversely of the passage, a fuel nozzle comprising a body adjacent the central and posterior thereto, fuel discharge orifices in said body adapted to-discharge jets of fuel transversely of the induction passage in the immediate lee of said arms, ducting fuel to said. nozzle body, and a spring loaded piston in said body adapted to uncover said orifices inresponseto fuel pressure.

7. In a charge forming device, an induction passage having an air inlet, a throttle in the passage, a member having a plurality of fingers extending transversely in said induction passage posterior to the throttle, fuel discharge nozzles adjacent the base of and in the lee of said fingers adapted to deliver jets of fuel transversely-of the passage in the lee of said fingers, a fuel conduit for supplying fuel to said nozzles, air discharge jets adapted to of the jets of fuel discharged by said fuel nozzles, and a duct connecting said air jets with the air inlet.

8. In a charge forming device, an induction passage, a bar extending substantially across said induction passage and having a plurality of lateral projections therefrom extending transversely of the induction passage, said projections having relatively flat leeward surfaces, a fuel conduit in said bar, a fuel orifice in said portion of the X member a fuel conduit for con-' discharge air alons a Path 1 in intersecting relation with passage, a bar extending transversely of the induction passage, a support extending inwardly from the wall of the passage and connected to said bar, a fuel duct in said bar extending substantially the full length thereof, a .fuel conduit leading from a source of fuel to said duct, lateral projections from said bar extending transversely of the induction passage, fuel orifices in said'bar adapted to receive fuel from the duct and discharge jets of jections, an air duct in said bar having air discharge orifices adapted to discharge jets of air the jets of fuel, and an air supply passage communicating with said air ouct and surrounding a portion of the fuel conduit whereby air flow therethrough will cool e the fuel flowing through the fuel conduit.

12. In a charge forming device, an induction passage, a plurality of members within the passage and extending transversely and longitudinally thereof, a group of fuel discharge.orinoes positioned to discharge fuel transversely of the induction passage in the immediate lee of said members, a second group of fuel discharge orifices dongitudinally spaced in the induction passage from the first mentioned group and similarly positioned with respect to the members, a fuel conduit. for supplying fuel to said orifices, and a spring loaded valve responsive to fuel pressure controlling one of said groups of fuel discharge orifices.v

ls. In-a cnarge forming device, an induction Passa e, a plurality of members within the passage and extending transversely thereof, a group of fuel discharge orifices positioned to discharge fuel transversely of the induction passage in the immediate lee or said members, a second group of fuel discharge orifices longitudinally spaced in the induction passage from the first mentioned bar at the base of each projection and adapted to receive fuel from said conduit and adapted to discharge a jet of fuel transversely of the induction passage in the lee of said. projection and toward the tip thereof, and means for supplyin fuel to said conduit.

9, In a charge forming duction passage and a throttle therein, a bar passage posterior to the throttle and having a pl a y of lateral projections therefrom extending trans-' and terminating at points spaced from the wall of the induction passage, 9, fuel conduit in said bar, a fuel nozzle at the base of each projection adapted to receive fuel from said conduit and adapted to discharge a jet of fuel transversely of the passage in thelee of said projection and toward the tip thereof, and means for. supplying fuel to said conduit.

versely of the passage 10. The invention defined in claim 9 compris ing in addition an air passage in said bar. a duct communicating said air passage with a source of air at substantially atmospheric pressure, and air discharge nozzles adapted to receive air from said air passage and adapted to discharge jets of air along lines-intersecting the paths of the jets of fuel discharged by said fuel nozzles.

11. In a charge forming device, an induction device having an in-' group and similarly positioned with respect to the members, a spring loaded valve responsive toiuel pressure controlling the fiow of fuel to at least one of said groups offuel discharge orifices,

of air discharge orifices directed to disair across the path of fuel discharged by a grou charg the fuel orifices, means for supplying fuel to the fuel orifices, and means for supplying air to the air orifices. v 1

14. In a charge forming device, spaced parallel induction passages, means forming a support between the passages, a multi-armed mem ber secured to said support and having its arms extending transversely within the passages, a

group of fuel discharge orifices positioned to discharge fuel transversely of the induction passages in the immediate lee of said arms, a second group of fuel discharge orifices longitudinally spaced in the induction passage from the first mentioned group and similarly positioned with 'respect to the members, a fuel conduit for supplying fuel to said orifices, and a spring loaded valve responsive to fuel pressure controlling the flow of fuel to at least one of said groups of fuel discharge orifices.

15. In a charge forming device, spaced induction passages, a wall separating the passages and forming a support, a multi-armed member secured to the support and having its arms extending transversely within the passages, the leeward surfaces of said arms-being relatively fiat, fuel discharge orifices adapted to discharge jets of fuel transversely of the induction passages in the immediate lee of the arms and toward. the ends of the arms, a fuel conduit supplyingfuelto the fuel discharge orifices, and a fuel presfuel in thelee of said promember toward the tip sure responsive valve controlling the fuel conduit.

16. In a charge forming device, a pair of spaced parallel induction passages, a support positioned between ancl adjacent said passages, an element mounted on said support having portions exalong and generally toward the tips of said members, and a fuel conduit in the support adapted toreceive fuel from a source and to supply fuel to said fuel orifices.

117. In a charge forming device, means defining spaced parallel induction passages. means separating said passages and forming a support, a member secured to the support and having a plurality of projections extending transversely within the passages and terminating short of the walls thereof, a plurality of fuel orifices adapted to discharge jets of fuel in the immediate lee of said projections transversely of the passage means and longitudinally of the projections toward the tips thereof, and a fuel conduit in said support for supplying fuel to said fuel orifices.

.18. In a charge forming device, an induction passage, a finger like air shielding member hav,- ing a substantially fiat leeward surface and pro,- jecting transversely within the passage, said member having a tip end spaced from the wall of the passage, a fuel nozzle adapted to dis- .charge a jet of fuel transversely of the passage from a point adjacent the face of the member in the lee of and longitudinally of the air shielding thereof, means for supplying fuel to said nozzle, an air dischargenozzle positioned adjacent the fuel nozzle to discharge a jet'of air which intersects the jet of fuel discharged by the fuel nozzle to thereby break up the fuel being delivered in her and to cooperate with the shielding member to control the distribution of fuel through the passage, and means for supplying air to the air discharge nozzle.

19. In a charge forming device, means defining an induction passage. a member having a plurality of finger-like projections extending transversely within and only, partially across said passage, said projections being inclined from base to tip in the direction of air flow, a

fuel discharge orifice adjacent the base of each projection arranged to discharge a jet of fuel substantially transversely of said induction passage in the lee of and toward the tip of said prothe lee of the memasvassa jection along a line Which intersects the leeward side of said projection.

20. In a charge forming device, a body having an induction passage therethrough, a member supported on the bodyvand having a plurality of finger-like projections extending therefrom transversely within the induction passage and terminating at points spaced from the induction passage wall, said projections having substantially fiat leeward. surfaces, and fuel discharge ports adapted to discharge jets of fuel transversely of the induction passage in the immediate lee of said projections and in a direction longitudinally of the projections toward the tips thereof. 1

2l. In a charge forming device, a body, induction passage means extending through the body, a substantially X.-shaped member supported adjacent its central portion on the body and having its arms projecting transversely of and only partially across the passage means, fuel discharge orifices adjacent the central portion of the X"'member in the lee of the bases of said arms and adapted to discharge jetsof fuel transversely of the induction passage toward,

the ends of and in the immediate lee of said arms, and means for supplying fuel to said oriilces.

22. In a charge forming device, a body, induction passage means extending through the o y. a substantially x"-shaped member supported adjacent its central portion on the body and having its arms extending transversely of the passage means, said arms being curved in both the longitudinal andtransverse planes of the induction passage means and having substantially fiat leeward surfaces, a fuel discharge nozzle adjacent the central portion of said "X member, discharge orifices in the nozzle in the immediate lee of the bases of said arms and positioned todischarge jets of fuel transversely of the passage means in the lee .of the arms, and a conduit for supplying fuel to said discharge orifices.

23. In a charge forming device, a pair of spaced parallel induction passages, a wall between the passages forming a support, a substantially X-shaped member mounted adjacent its central portion on the support and having two of its arms extending transversely within and only partially across each induction passage, said arms being curved in both the longitudinal and transverse planes of the induction passages and the tip .of the arms being downstream from the base of the arms, a fuel orifice adjacent the base of and in the ice of each arm adapted to discharge a jet of fuel transversely of the passage in the lee of the arm along a line which intersects the leeward side of the arm.

FRANK C. MOCK.

. 7 CERTIFICATE OF CORRECTION. 7 Patent No. 2,57 ,55 March 27, 1915. Y

FRANK c MQGK.

It is herebyeertified that error appears in theprinted specification of the above numbered patent requiring cerrect ionas fO-llOWsrPageZ, firefcolumn, line .52, fer "conduii: 59" read -cQndui'b 50 page 6, first eolumn, line 39, claim 18, for "face re'ad --base--; line 56. claim 19, aft r t word and comma "fl w," .insert' '--and and that the said Letters Patent should be vread. with I this correction therein that the 'same may conform tq the record of the case in the Patent Office; I Y

Signed and sealed this 12th day r' March, A. "D. 19%.

Leslie Frazer (Seal) 4 First Assistant Commi'ss ioner ef Patenes. j: