US1961413A - Carburetor - Google Patents

Description

June 5, El DANSREAU CARBURETOR Filed July 5, 1953 2 Sheets-Shawn` l fj {a} a// 0,' 77 Z fz V gj /d '-7/4 ff. /Z/ 1f"- f l ij o a 7,

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2Q J9 f Z9 kgnj0` j I .nvenior Homey Patented June 5, 1934 l 1 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to a carburetor or fuel injector, the general objectof the invention being to provide means for feeding a measured amount of fuel to the cylinders of a gasoline engine or the like progressively and in perfect ratio with the speeds and load of the engine and to make the device entirely mechanical in its action, with means for controlling the mechanical action by the vacuum or suction created by the pistons of the engine.

This device eliminates the use of a bowl and float as the fuelis introduced into the device under pressure from any suitable form of pump.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:-

Figure 1 is a longitudinal sectional view through the invention.

Figure 2 is an elevation thereof,`

Figure 3 is a View similar to Figure 1, but taken at right angles thereto.

Figure 4 is a section on line 4-4 of Figure 2.

Figure 5 is a top plan view of the lower member of the device, with parts broken away to show some of the conduits.

Figure 6 is a section on line 6-6 of Figure 1.

Figure 7 is a fragmentary top plan View of the center member, with parts in secton.

Figure 8 is a section on line8-8 of Figure 3.

As shown in these views, the body of the device is composed of the end parts 1 and 2 and the central part 3. The part 1 is formed with the two cylinders 4 which intersect the passage in said part' 1 and each cylinder has a yroller 5 therein, each of which is formed with the trunnions 6 rotatably arranged in bearing parts of the cylinder carrying portion of the member 1 and in the closure plate 7 for said portion. One of the trunnions passes through theplate 7,l as shown in Figures 2 and 6 and has an arm 8 connected to its outer end to which' the'llink v9 from the accelerator or hand throttle is connected. 'I'he two rollers are geared together, as shown at 10, so that motion of one roller will be communicated to the vother and each roller is formed with a notch or opening 11 which is preferably of the shape shown in Figure 1, so that when the rollers are moved to a certain position, the two openings or slots 11 will form a passage between the rollers for the 110W of explosive mixture. When the solid portions of the rollers are in contact, as shown in Figure l, the passage in the member 1 is closed.

The member 2 has the choke valve 12 therein the shaft of which is shown at 12,' and this valve is formed with the opening 13 for receiving the cross piece 14 when the valve is in open position, as shown in Figures 1 and 3, this opening being closed by a projection 15 in the member 2 when the valve is in closed position. The cross piece 14 carries a small cylinder 16 for a purpose to be hereinafter described.

The member 3 is of plate-like form and has parts located between flanges 17 on the adjacent ends of the parts 1 and 2, and the three parts are connected together by the bolts 18.

The member 3 is formed with the opening 17 which connects the passage in the member 1 with the passage in the member 2 and it is also formed with the bar-like projections 18 which extend into the opening from opposite sides thereof and the inner end of each projection 18 is forked, as shown at 19, to receive the upper end of an angular bar 20 whichvis pivoted to the prongs of the forked part, as shown in Figure 3. The inner ends of these parts 18 are spaced apart and a rod 21 passes between them and has a conical part 22 formed on'an intermediate part thereof for engaging the lower bent ends 23 of said arms or bars 20. A tubular part 24 has its upper part supported from these bar-like projections 18, with a cross piece 25 at its lower end having a hole therein through which the lowerend of the rod 21 passes, the tubular member being preferably of the shape shown in Figures 1 and 3, with openings 26 therein and with both ends open and the conical portion 22 is located in this tubular member. Passages 27 are formed in the .parts 18 and open out through the inner ends thereof and these passages are inL communication with the passages 28 which have portions extending downwardly into the memberjl where they connect with the passages 29 in the member 1 and these passages 29 are connected by a port 30 with .a passage 31, one end of which passesv through a nipple `32 which is adapted tobe connected to a 4 pump or the like and the` otherend of which passes through a ,nipple 33 whichis closedby a enclosed in a housing 37, the outer end of which is closed by a screw 38. Each valve is formed with a long stem 39, the end of which is adapted to be engaged by an arm 20 when the arms are pressed apart by the conical member 22 on the downward movement of the rod 21. When this occurs, the valves are forced from their seats so that fluid can enter the passages 27 and be discharged under pressure through the jets 40 which pass downwardly from the inner ends of the passages 27 through the lower edges of the parts 18. Air passages 41 pass vertically through the members 18, as shown in Figure 8. Gates 42 are connected by screws 43 to rods 44 rotatably arranged in holes in the member 3, as shown more particularly in Figure 7, and these gates are connected by links 45 with the two part arm 46 attached to the upper part of the rod 21, by means of a placement nut 52 confined in a groove in the arm 46, which allows the nut to be rotated on the threaded portion of the rod 21, in this way obtaining an adjustment for locating conical portion 22 in proper location. These gates close the opening 17 excepting for the space formed by the tubular part 24, and the upper end of the rod has a bearing 47 attached thereto which operates in the cylinder 16.

One of the rods 44 extends from the member 3 and has an arm 48 adjustably attached thereto, which has a pin 49 on its free end which passes through a slot 50 in a link 51 which is connected to the arm 8 of the throttle rollers 5. These parts are so formed that when the throttle rollers are in closed position, the link 51 will have swung the arm 48 downwardly to close the gates 42 and when said rollers are moved to open position, the slot 50 and pin 49 will not move the arm 48 and when these throttle rollers are in open position,

they move the rod 21 downwardly so that the Y conical part 22 thereof, pressing upon the arms 20 will cause the said arms to open the valves 35 so that fuel under pressure will pass through the passages 27 and discharge through the jets 40 and thus be sprayed into the air stream passing to the cylinders.

A passage or conduit 53 connects the passage 31 to a port 54 in the member 1 below the throttle rollers 5, and this port 53 is controlled by a needle valve 55 normallyl covered by a cap 56. Thus some of the fuel entering the device `under pressure will pass into the member 1 below the throttle valves `to provide sumcient fuel for idling purposes and the amount of fuel enteringv this port 54 can be regulated by the valve 55.

The positive action in fuel feed eliminates the need of a bowl or float as the fuel is forced at a pressure of from two to` three pounds from the fuel pump direct to injector valves. The pressure is maintained at high speed as at low speeds by the same variable R. P. M. of the motor which is accomplished by any standard fuel pump driven by the cam shaft of the motor. The outstanding feature of the designing of my invention, is to eliminate any costly pump or check valves to control the flow of gasoline, and in feeding the i of fuel fed into the air stream and the velocity and volume of air passing through the air shutters control the opening and closing of the fuel jets.

The fuel is fed to the jets under pressure and as the jets open it forms a very fine spray. The automatic control of these jets by the air stream also automatically controls the ratio of fuel to volume of air as there is no direct connection between the throttle and the valve mechanism. The construction of the carburetor allows-it to be used in anyposition such as up, down, or sideways as there is no bowl or float in the fuel feed system.

The valve assembly is all contained inthe one member of the carburetor and is so enclosed to prevent air leaks and is easily removed without disturbing the body of the carburetor and connections. 'I'he fuel adjustment is made by raising or lowering the center valve actuating rod by means of turning placement nut in shutter cross arm.

'I'he acceleration of a motor with this carburetor is very fast due to the action of the automatic valve mechanism in the instant feed of the fuel under pressure direct to the air stream going through the venturi of the carubretor. 1 This acceleration is also controlled at different loads such as the difference of a level road and aV hill balancing the fuel ratio to power needed.

The efficiency of this carburetor will be increased with driving as the automatic valve will work more smoothly with use and after a long period of driving the valve member can be replaced at a small cost without disturbing the rest of the carburetor and will give a maximum of power and speed to a motor.

The roller action of the throttle eleminates the deflection of the air stream by' means of the variable opening by the turning of the two rollers in which there is a groove that starts at almost a point and gradually becomes larger in turning until at one half turn the aperture in between rollers is as large as the throat of the large 115 venturi. 1

'Ihe construction of the injector jets confines all air bleeder leadsto the main air inlet whchis supplied by clean air from the air cleaner which 1s now provided to all carburetors; in this way I 120 have no outside air bleeders, thus eliminating all chances of.dirt plugging these small orifices.

'I'he straight line construction of this device vallows a free flowing air stream with a minimum of deiiection. The elimination of this deflection gives the utmost in atomization, thereby getting the most energy out of the fuel.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fau within the scope of the appended claims.A

What is claimed isz- 1. In a carburetor, a body having a assag therethrough, parts projecting into the gassag: and having jets therein and said body havingl fuel passages for leading fuel into the jet's, nor- 140 mally closed valvescontrolling the fuel passages, throttle means controlling the passage through the body, an 'air valve normally closing the pas, sage through the body and opening when the vthrottle means are open to create a vacuum in the passage in the body, and means for movingv the fuel valves to open position by the opening movement of the air valve, said throttle means including a pair `of rollers each having a notch therein, said notches forming an opening between l vthrough the body and opening when the throttle means are open to create a 'vacuum in the passage in the body, means for moving the fuel 'valves to open position by the opening movement 'of the air valve, said throttle means including a pair of rollers each having a notch therein, said notches forming an opening between the rollers when the rollers are in one position and solid portions of the rollers closing the passage through the body when the rollers are in another position, and means for closing the air valve by closing movement of the throttle means, but permitting opening movement of the throttle means Without opening the air valve.

3. In a carburetor having a passage passing therethrough, bridge pieces extending into the passage and having jets therein, said body having a passage leading to the jets in each bridge piece, normally closed valves for controlling said passages, pivoted arms engaging portions. of the valves, a longitudinally movable rod inthe passage of the body having an enlargement thereon for moving the arms outwardly to open the valves when the rod is moved in one direction, a tubular part supported by the bridge pieces and in which the enlarged part of the rod is located and guided, a pair of air valves controlling the passage through the body and associated with the tubular part, means for connecting the air valves to the rod to cause movement of the rod when the valves are operated to open the fuel passages, said air valves opening when the throttle means are opened to permit suction from an engine to operate on the air valves.

4. In a carburetor having a passage passing therethrough, bridge pieces extending into the passage and having jets therein, said body having a passage leading to the jets in each bridge piece, normally closed valves for controlling said passages, pivoted arms engaging portions of the valves, a longitudinally movable rod in the passage of the body having an enlargement thereon for moving the arms outwardly to open the valves when the rod is moved in one direction, a tubular part supported by the bridge pieces and in which the enlarged part of the rod is located and guided, a pair of air valves controlling the passage through the body and associated with the tubular member, means for connecting the air valves to the rod to cause movement of the rod when the valves are operated to open the fuel passages, said air valves opening when the throttle means are opened to permit suction from an engine to operate on the air valves, and a choke valve for controlling the passage through the body.

.5. In a carburetor, a body having a passage therethrough and including a number of parts detachably connected together, an intermediate part having an inwardly extending projection thereon extending into the passage and provided with jets opening out into the passage, said intermediate lpart having a fuel passage therein in communication with the jets, means for feeding fuel to said fuel passage, a spring pressed valve controlling the flow of fuel through said fuel passage to the jets, an air valve carried by said intermediate part and opened by suction from the engine,\a member pivoted to the inwardly extendingprojection and engaging a part of the spring pressed valve, and a rod connected with the air valve for movement therewith and having a part thereon for `engaging the pivoted member for moving the pivoted member to open the spring pressed valve when the air valve .moves to open position. j

ELY J. DANSREAU.

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