US1988285A - Impulse fuel feeding device - Google Patents

Description

1935. E. A. ROCKWELL 1988'285 IMPULSE FUEL FEEDING DEVICE Original Filed Sept. 3, 1927 5 SheetsSheet 1- :llllillllllllilllllTL E A ROCKWELL IMPULSE FUEL FEEDING DEVICE Origirial Filed Sept. 5, 1927 5 Sheets-Sheet 2 E. A. ROCKWELL.

IMPULSE FUEL FEEDINQ DEVICE Original Filed Sept.' :5. 1927 w 5 Sheets-Sheet s,

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assesses he is, sass IMPULSE FUEL FEEDING DEVICE Edward A. Rockwell, New York, N. Y.

Application September 3, 1927, Serial No, 217,482

Renewed August 2, 1938 1 Claim. 103-38) My invention relates to a device for feeding fuel by means of an impulse providing a pre determined pressure, and which is adapted for use in connection with fuel feeding devices gen erally, but which is especially adapted for use in connection with internal combustion engines and automobiles using the same. a

The object of my invention is to provide a device of the above character whereby the fueiwill be fed by means of an impulse providing a predetermined and constant pressure upon the fuel,

and which, therefore, does not change the rate of consumption of the fuel according to any variations in the fuel supplied by means of the A further object is to provide 15 feeding device.

a device which will accomplish the above purposes. by producing the pressure impulse by the fuel; around the same. Furtherpbject's of my invention are to provide a construction of this kind with a minimum number of parts, and such as to occupy a minimum amount of space so as to eliminate unnecessary cost of materials and labor in manufacturing the same. Further objects of my invention will appear from the detailed description of the same hereinafter.

While my invention is capable of embodiment in many different forms, for the purpose of illustration I have shown only certain forms of the same in the accompanying drawings, in which- Figure 1 shows diagrammatically the general arrangement of an apparatus made in accordance with my invention;

Figure 2 is a vertical section of a valve chambet as used therein taken on line 22 of Figure 3;

Figure 3 is a plan view of the same;

Figure 4 is a side elevation of the same;

Figure 5 is a vertical section of an impulser used in connection therewith taken on line 5-5 of Fig. 6;

Figure 6 is a section through the same taken on line 6-6 of Fig. 5;

Figure 7 is a vertical section of a modified form of myrinvention; and

Figure 8 is aplan view at same,

vide an impulse mechanism utilizing a pistonv In the drawings, referring first to Figures 1 to 6, I have shown my invention as applied to an automobile comprising, as shown diagrammatically in Figure 1, a chassis 1 having wheels 2 and 3 at the rear and front thereof, an en- 6 glue 4 at the front of the same, and a fuel tank 5 at the rear thereof provided with a removable cover 6. A gasoline supplypipe '1 leads from the fuel tank 5 to aport 8 in a casting 9 which forms an upper member of the valve chamber, 10 as shown in Figure 2. The casting 9 has an angle member 10 thereon with openings 11 for the introduction of bolts to secure the valve chamber to, any suitable part of the mechanism or automobile. There is an inner chamber 12 in said a t n a, the lower end of which is closed by of an inlet valve 13 which is supported ona-v'alve'seat 191 screw-threadm into the casting, 9. In the valve seat 14, furthermore, there is carried a dome-shaped strainer 15 6f wire gauze, or any other suitable material, which is retained in place by means of a split ring 16 fitting into a groove 17 in the member 14 in such a position as to overlie a flange 18 on the strainer 15. Beneath the strainer 15 there is anouter chamber 19 formed by a removable cup 20 adapted 'to act as a vacuum trapping chamber andto catch any sediment during the passage of I the gasoline, said cup being held in place by of the casting 9 with the aid of a gasket 22. It will be noted that the port 8 leads into the said outer chamber 19 so that the gasoline is supplied therefrom through the valve 13 into the inner chamber 12. From this point the fuel 85 passes through a valve seat 23 screw-threaded in the interior of the casting 9, the upper end of which acts as a seat for an outlet .valve 24. which is held in place by means of a spring 25. The fuel passes out of the casting 9 through a 0 pipe 26 to a carburetor 27 having a float chamber 28 attached thereto, which is provided with afloat 29 having a pin-waive 30 to maintain a constant level of liquid in the chamber 28 for supplying the carburetor 27 with a supply of fuel of a constant head so as to provide a uniform pressure of fuel from the float chamber to the carburetor and thereby render the feed of the fuel to be consumed by the carburetor independent of the pressure in the supplyoi the fuel from the impulse feeding device.

The impulses for the device are supplied "through a pipe 31 which leads through an in- 'clined port 31a positioned at the lower side of the piston chamber 32 so as to drain oil from said piston chamber 32 liquid which may pass the piston 33, said piston reciprocating in said piston chamber being arranged to provide air impulses through said pipe 31 to the chamber 12 to which the pipe 31 leads. The piston 33 has a number of air ports 34 passing through the wall of the same, and a piston ring packing 35 between the location of said ports and the head of the piston. At the upper end of the stroke of the piston head, the vacuum in the cylinder below the piston is vented through the ports 36 in the wall of' the cylinder and at the lower end of the piston stroke the vacuum in the cylinder above the piston becomes vented through said ports 36 registering with the port 34 in the piston wall. The piston 33 has a connecting rod 37 which passes through a rocker arm 38 carried by journal-bearings 39 and having a roller 40 on its other end arranged to ride on a cam 41 carried by a cam-shaft 42 driven from any suitable part of the engine 4. The rocker arm or lever 38 supports a cylindrical member 138 which has a circular opening 139 therein adapted to receive the connecting rod or stem 37 whereby the cylindrical member 138 is slidable with respect to the stem 37 and is rotatable with respect to the lever. 38 thereby accommodating the arcuate movement of the lever with respect to the linear travel of the stem 37. The extreme upper end of the connecting rod 37 is provided with a buffer spring 43 held in place by a ring 44 secured to the end of the connecting rod. Said spring rests at its other end-within a shoe or abutment 45 adapted to contact with the inner end of the rocker arm 38 and this provides an increased spring-resistance at the end of the lever stroke to eliminate noise. The inner end of said rocker arm 38, furthermore, is provided with extension springs 46 and 47 in order to force the rocker arm 38 at all times against the face of the cam 41, the other ends of the springs 46 and 47 being connected to a bracket 48 forming a part of a frame 49 which carries the journalbearings 39. Said frame 49, furthermore, acts as a support for one end of a main spring 50, the other end of which rests in an annular support 51 carried by the piston 33 around the connecting rod 37. It will be noted from Figure 6 that the frame 49 and the cylinder 32 are secured by means of bolts 52 to an engine casting 53. In the form of my invention illustrated in Figure 5 it will be apparent that the lever 38 is entirely carried within the engine casing 53 and this construction is desirable in many instances where the aperture at which the pump casing is mounted is located beneath the engine-driven cam.

In the form of my inventionshown in Figures '7 and 8, the pipe 7 from the fuel supply tank 5 leads into a cover member 54 screw-threaded to a float chamber casting 55 and having a valve seat 56 to cooperate with a valve 57 carried by a float 58 and which is adapted to move on a centrally located pin 59 screw-threaded in the bottom of the float chamber 55 which also acts as a vacuum trapping chamber. A passage 60 conductsthe gasoline from the float chamber 55 to a sediment chamber 61 having a flange 62 thereon to enable an impulser cylinder 63 to be secured thereto by screws 64 and bolts65. In

7 the bottom of the cylinder 63 I have provided a valve seat 66 which is screw-threaded into the same, and which is adapted to support on the upper surface an inlet disc valve 67, which is retained in place by means of a cage 68 secured in an annular recess located around the valve .seat 66; In the valve seat 66, preferably, I also provide a strainer 66a which is held in a recess therein by-means of a snap-ring 661). At the side of the cylinder 63 there is provided a spring pressed outlet disc valve 69 which is supported by a valve seat 70 in the cylinder 63 and the movement of which is limited in the opposite direction by an extension 71 on a screw-threaded flange 72 provided for connection to the pipe 26 which leads to the carburetor, the carburetor being constructed in the same manner as previously described. In the cylinder 63 there is a piston 73 having a connecting rod 74 provided with a bufler spring device 75 at the opposite end, constructed aspreviously described in connection with the other form of my invention. The connecting rod 74 is moved by means of a lever 76 carried in a Journal 77 in a lever-housing 78 secured to an engine casting 79 by screws 80. The lever 76 carries at one end a rotatable member 176 which slidably'engages the stem 74. The lever 76 is operated from the engine in the manner described previously in connection with the other form of my invention. Furthermore,

in this instance there are two springs 81 forcausing the lever 76 to remain in contact with the operating cam 76:, the springs 81 being connected at one end to the lever 76 and at the other end to a diaphragm 82 which is bolted between the lever-housing 78 and the cylinder 63 by means of bolts 83. A spring 84 surrounds the connecting rod 74 and is supported at one end by the diaphragm 82 and at the other end is in contact with the body of gasoline I have provided an effective means for preventing the escape of the gasoline around the outside of the.

This is done by providing a bath piston 73.

of oil under higher pressure than the gasoline around the periphery of the piston 73 in annular grooves 86 and 87 around the outside of the piston, and by providing a port 88 in the cylinder 63 which communicates with an oil pressure pipe.

89 leading to the oil pressure pump-90 of the usual kind-provided on internal engines for the pumping of the oil in the lubrication of the engine to both seal the piston 73 and lubricate 1 to 6 the gasoline is fed by constantly recurring pressure impulses due to the reaction of the spring 50 which produces the forcing or pumping stroke of the piston 33, the springs 46 and 47 being provided merely to cause the lever 48 to contact at all times with the cam 41. In the instance of the arrangement intended to be indicated in Figure 5, the impulses are given to air occupying the piston chamber and pipe connections thereto, and are transmitted thereby tothe valve casing containing the valves 24 and 13, which is purposely placed high to prevent flooding when the fuel tank 5 becomes elevated, so that the fuel is thus fed under a constant pressure impulse to. the float chamber 28 of the carburetor. Accordingly, also, the float chamber 28 maintains a constant level of fuel for the carburetor 27 and, therefore, the fuel is vapor-- ized or sprayed by the carburetor 27 entirely in dependently of the particular pressure which is names therewith, an effective priming is received and for its function as a sediment chamber and priming chamber, the chamber 19 can be made as large as desired. In the other form of my invention asshown in Figures 7 and 8, the operation is similar. The intake stroke of the piston under the positive actuation of the engine cam, indicated at 76.1., draws in or admits the i'uel from the fuel source, which, as shown, is the float chamber, 55, in which the level is controlled by the float, 58, which closes the inlet port, 56, when the predetermined level is reached. The fuel thus taken into the piston chamber is retained by the check valve, 6'7, subject to the impulse stroke 01 the piston under the reaction of the spring, 84, by which the iuel is red to the carbureter float bowl past the check valve, 69, which prevents its return in the succeeding intake stroke of the piston.

In this arrangement it impulser piston in its impulse stroke is in contact with liquid so that there is no occasion for providing the means of venting vacuum or pressure in order that the piston strokes may be fully eflective for intake and discharge, respectively, as was seen to be necessary in the arrangement indicated in Figure 5, in which the fluid upon" which the impulse is exerted is gaseous. But on the other hand, in view ot the undesirabllity 01' having the liquid pass the piston, it is important in the arrangement of Figure 7 to prevent such passing, which cannot be eiiectively done by any structure shown solid packing; and in the in Figure 7, it is done by willbeseenthatthe between the providing an oil seal under pressure around the periphery of the piston 73 so that no gasoline can escape, and, instead, ii there is any flow of liquid it will be the slight flow of oil from around the periphery of the piston, It will be understood that the provision in the arrangement shown in Figure 'l 01' the float chamber, 55, and float-controlled valve therein is to prevent flooding the pumping system when the fuel tank, '5, is elevated above the level at the carbureter float chamber, 28.

It is to be understood that as the impulser any other known type or impulse producing means may be used instead or a piston.

While I have" described my invention above in detail I wish it to beunderstood that changes may he made therein without departing from the spirit oi the same.

I claim:

In combination, an. impulser chamber, a reciprocating spring pressed impulser therein, a lever extending laterally into one side of the chamber operating the impulser, a fuel feeding passageway extending laterally towards the other side of the impulser chamber, and a fuel inlet chamber connected with said passageway and located alongside of the impulser chamber, the impulser chamber being divided transversely between the lever and the impulser and clamped together at that point circumterentialiy, together with a spring supporting diaphragm clamped impulser chamber sections.

A. ROCKWELL.

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