US1742429A - Carburetor - Google Patents

Description

J. L. WALKER Jan. 7, 1930.

CARBURETOR Filed Feb. 6. 1926 2 Sheets-Sheet l 6 Jvsephl}. Wallflsv' 5141mm fo'c Jan. 7, 1930. J. 1.. WALKER 1,742,429

CARBURET'OR File Feb- 1926 2 Sheets-Sheet 2 nlznlmum Ljillillllu WW JoscphL. Well/fer avwemroz I I I Patented Jan. I, 1930 UNITED STATES PATENT OFFICE Josnrn 1.. WALKER, or BATON ROUGE, LOUISIANA CARIBURETOB Application filed February ing and repairing them.

A further object is to provide a carburetor utilizing a rotary valve which can be shifted at will to regulate the amount of mixture delivered from the carburetor, the construction and operation of the valve being such as to proportionately increase or reduce the flow of air and fuel when the mixture deliv ered from the carburetor is increased or reduced in volume.

With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings,

Figure 1 is a top plan view of the carburetor.

' Figure 2 is a side elevation thereof.

Figure 3 is a section on line 33 Figure 1. Figure 4 is a section on line .4-4 Figure 2. Figure 5 is a section on line 5-5 Figure 3. Figure 6 is a section on line 66 Figure 3. Figure 7 is a view partly inelevation and partly in section showing more or less in diagram the cooperating ports in one side portion of the carburetor.

Figure 8 is a perspective view of the nozzle sleeve.

Referring to the figures by characters of reference 1 designates the casing of the car buretor provided with an air intake passage 2 and an outlet passage 3, the two passages being preferably in alinement and spaced apart by a substantially cylindrical intermediate portion 4 the bottom of which is recessed as at 5 so as to provide a circular seat. A partition 6 partially closes communication between the interior of the central portion 4 8, 1928. Serial No. 86,557.

and the inlet passa e 2 while another partition 6, partially c oses communication between the outlet passage 3 and the intermediate portion 4. As shown particularly in Figures 5, 6 and 7 the lower edges of these partitions are inclined so that each of the partitions overhangs the opening throughv communication is established between which the central portion 4 and the adjacent passages 2 or 3.

Mounted for rotation within the intermediate portion 4 of the casing is a cylindrical valve 7 within diametrically opposed portions of which are formed ports 8 and 9 adapted to communicate with the passages 2 and 3 respectively. As shown articular-1y in Figure 7 the port 8 has an inclined advancing wall 10 so that the port is wider at the bottom than at the top. It might be stated that the port 9 is of the same shape and arrangement as the port 8. Thus it will be seen that when valve 7 is rotated the widest portion of each of the ports'8 and 9 will first register with the lowermost portion of the opening or port 11 or 12 formed beneath adjacent partition 6 or 6. As the inclined edges 6 and 10 are pitched in opposite direc tions respectively, it will be obvious that during this relative movement of the valve while being turned in one direction the clearance between the crossed inclined edges of the ports 8 or 9 and 11 or 12 will be gradually increased both in width and height. In this connection attention is called to Figure 7.

The top of the valve 7 is closed by an integral cap 13 provided with an annular flange 14. Formed beneath this flange are lugs 15 adapted to ride upon inclined cam surfaces 16 located upon the intermediate portion 4 of the casing 1- at diametrically opposed points. An arm 17 is extended from the cap 13-and constitutes means whereby the cap and the valve 7 can be rotated for the purpose of controlling the flow of air and gas through the ports as heretofore explained. It will be obvious that when the cap is turned in one direction for opening the ports thelugs 15 will ride upwardly on the cam surfaces 13 is rotated in the op site direction,this motion will be reverse the valve moving longitudinally back to its initial position while, at the same time, the ports are gradually closed.

The bottom of the recess 5 is provided with a drain 0 ening 18 for carrying 01f surplus liquid fuel. A nipple 19 is provided at the center of this recess and has a passage 20 extending therethrough. The upper end of the passage is flared as at 21 to provide a valve seat while the lower end of the passa e is also flared as at 22 to provide a seat or a tapered plug 23 ground or otherwise properly fitted to its seat so as to provide a sufficiently tight connection. This plug is provided with one or more wings 24 whereby it can be removed readily from its seat 22. A. passage 20 within the nipple communicates with a laterally extending passage 25 formed within a tubular arm 26 extending laterally from the intermediate portion 4 of the car uretor casing. A .fuel suppl pipe, not shown, is adapted to be couple to this arm 26.

A tube 27 is disposed within the intermediate portion of the carburetor casing and has its counterbored lower end 28 fitted snugly upon the nipple 19. This tube is concentrio with the valve 7 and has its u per end 30 terminating close to the cap 13 of t e valve.

The tube constitutes a nozzle adapted to communicate with the passage 20 and formed within this tube at different elevations are small ports or vents 29 through which liquid fuel is adapted to be delivered in jets into the mixing chamber 30, which is the space surrounded by the valve 7.

A screw 31 is extended through the middle portion of the cap 13 and has a head 32 at its outer end. A stem 33 projects. from the other end of the screw and is located within the tube 27, this stem being provided at its free end with a needle valve 34 normally enga 'ng the seat 21.

or the purpose of holdin the parts of the carburetor properly assem led a relativel stiff spring wire 35 is arranged outside of t e casing 1 with its end portions turned inwardly toward each other. One of these end portions, 36, is seated within a recess 37 in the outer end of plug 23 while the other end portion 36 is seated within a recess 38 formed in the middle portion of the head 32. I

Thus the spring serves to hold the valve 7 pressed yieldingly into the casing while at the same time plug 23 is held firmly to its seat.

The screw 31 is adapted to be adjusted so that when the ports 8, 9, 11 and 12 are closed, valve 34 will be in engagement with itsseat 21. Thus itwill be seen that by rotating valve 7 as heretofore explained it will not only open the ports 8, 9 and 11 and 12 but the action of the lugs 15 on the cam faces 16 will result in the valv e being slid or shifted longitudinally so as thereby to lift valve 34 off of its seat 21 and emit a predetermined amount of 1i uid fuel provided by t e tube 27. Thus fuel will rise within the tube 27 and a small amount will be initial] delivered through the lowermost ports 29, t is amount bein the correct uantity to be mixed with t 0 .volume 0 air initially admitted through the partly opened ports 8, 9, 11 and 12. As the opening of these last named ports is continued thereby admittin a reater quantity of an to the mixing cliam er 30 and delivering a greater to enter the reservoir amount of the combustible mixture to the passage 3, the supply of liquid fuel admitted to the tube 27 will be increased by the further opening of valve 34 so that fuel can not onl be delivered from the lowermost ports 29 ut will rise and be delivered from orts at higher levels. Thus as the amount 0 fuel is increased the number of ports 29 through which it is delivered is increased and the liquid fuel thus delivered into the mixin chamber will be thoroughly commingled wit the air admitted thereto. The arran ement of the orts and valves is such that this mixture W111 always be in proper pro ortions irrespective of the amount of air an fuel being supplied to the mixin chamber.

travel of the air flowing through the car-- buretor, thus insuring a better mixture of the li uid fuel with the air than would be possib e should the liquid fuel be delivered along lines substantially parallel with the direction of the flow of the air.

For the purpose of locking the screw 31 adjustably to the cap 13 a lock nut 39 is mounted on the screw and bears firmly against the cap.

By removing spring 35 the valve 7 can be lifted readily out of the casing 1, tube 27 can be removed, plu 23 can be withdrawn from its seat 22 and the entire carburetor structure can thus be readily cleaned or repaired without requiring special tools or tools of any kind.

Any surplus liquid fuel that may accumulate within the mixing chamber is free to flow outwardly through the vent 18 through a pi e, not shown, to a fuel container.

at is claimed is:

In a carburetor a casing, a combined stitutin means for opening the fuel control ling va ve, thereby to 1 increase the flow of fuel in proportion to the increase in the flow of air to the mixing chamber, the number 5 of the ports in the nozzle through which the liquid fuel is delivered increasing as the amount of fuel is increased in the nozzle, a fuel supply passage leading to the fuel controlling valve and having an opening, a tapered plug constituting a closure for said opening, and a spring yoke embracing the carburetor casing and having its terminals extended toward each other, one of said terminals bearing against the plug and the other terminal exerting a pressure against the throttlevalve, thereby to hold the plug and throttle valve firmly to their seats.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature. 2o JOSEPH L. WALKER.

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