US1294578A - Carbureter. - Google Patents

Description

J. c. WALTON.

CARBURETER. APPLICATION map um. 12. 1911.

' Patented Feb. 18, 1919.

2 SHEETSSHEET 2.

v 3 ar E J T 1. I 2/ 0 III/Ill and has as its primary object to provide a JOSEPH C. WALTON, OF MINER-VA, OHIO.-

GARBUBETER.

Specification of Letters Patent.

Patented Feb. 1%, 1919.

Application filed March 12, 1917. Serial No. 154,313.

ful Improvements in Carbureters, of which the following is a specification. 7 p

This invention relates to an improved carbureter especially designed for use in connection with internal combustionengines device of this character wherein the richness of the mixture will be automatically decreased in direct proportion to the speed of the engine, so that for low engine speeds, a relatively rich mixture will be had while for higher speeds, a proportionately leaner mixture will be delivered to thus insure corresponding quick firing and power of the engine when the speed thereof is accelerate The invention has as a further object to provide a device of this character employing a main fuel nozzle and a needle valve arran ed to cooperate with said nozzle and wherein the said needle valve will be auto-. matically adjusted with respect to the nozzle for controlling the flow of fuel therefrom by suction within the mixing chamber of the device so that as the suction is increased by the increasing speed of the engine, the needle valve will be adjusted toward the fuel nozzle to correspondingly decrease the supply of fuel to the said chamber and thus decrease the richness of the mixture in proportion to any increase in the speed of'the engine.

A further object of the invention is to provide a device of this character wherein the normal position of the needle valve with respect to the main fuel nozzle may bev readily adjusted and wherein the adjusting rod employed for this purpose will also be mounted to automatically act upon the needle valve for adjusting the valve relative to said nozzle under the influence of suction within the mixing chamber. 1 And the invention has as a still'further object to provide a carbureter having an auxiliary, fuel nozzle, and a valve manually adjustable to permit the delivery of a rich mixture for starting or idling purposes.

Other and incidental objects will appear as the description proceeds and in the drawings wherein I have illustrated the preferred embodiment of the invention and wherein similar reference: characters designate corresponding parts throughout the several views:

Figure l is a top plan View of my improved .carbureter, particularly showing the sectional throttle valve employed, 1

Fig.2 is an elevation illustrating the arrangement of the air inlet of the device,

Fig. 3 is a sectional view particularly showing the general construction of the carbureter,

Fig. 4 is a transverse sectional view taken on the line 44 of Fig. 3, particularly showing the arrangement of the fuel ducts leading from the float chamber of the device,

Fi 5 is a sectional view particularly showing the fuel bowl and the mounting of the float within the float chamber ofthe said bowl, and i Fig. 6 is fragmentary plan view, on a slightly enlarged scale, illustrating the connection between the needle valve employed and the adjusting rod forthe said valve;

In carryingout the invention, my improved carbureter is formed with a body or casing 10 providing an air inlet passage 11 contracted intermediate its ends to form a reduced throat 12. Above the said throat is provided a mixing chamber 13 and leading from the said chamber is a mixture discharge passage 14. Extendingvupwardly along one side of the body is an auxiliary mixture passage 15 communicating, at its lower end with the air passage 11 and contracted adjacentits lower extremity to provide a reduced throat 16. At its upper end, the passage 15 communicates-with the m1x-. ture discharge passage 14 by a passage 17 Formed on the upper end of the body, at the adjacent side thereof, is a boss 18 in which is screw threaded a manually operable valve 19 adjustable to close the passage 17. A spring 20 is connected to the said boss for holding the valve at adjustment.

Formed on one side of the body 10, at its lower extremity, is a fuel bowl 21 providing a float chamber 22 closed, at its upper end, by a cap plate 23 detachably secured to the bowl by screws or other suitable fastening devices. Screw threaded through the bottom of the bowl is a hollow plug 24 internally threaded to receive a pipe connection 25 from a suitable source of fuel supply. Slidably fitted through the said plug to extend upwardly through the bowl is a valve rod or stem 26 u on the lower end of which is arranged a ba 1 valve 27 adapted to seat within the plug 24 for shutting off the flow of fuel into the float chamber. The rod 26, at itsupper extremity, projects through the plate 23 and is slidably received by a guide cap 28 screw threaded the said plate. Adjustably fitted upon the rod 26 and arranged within the chamber 22 is a sectional ,float 29 which is preferably formed of metal and arranged to cooperate with this float is an adjusting collar 30 therefor. This collar is screw threaded upon the rod 26 and projects freely through the plate 23 so that by removing the cap 28, the collar may be readily adjusted upon the said rod for varying the normal position of the float 29 within the float chamber and accordingly regulating the normal level of the fuel therein, the float, of course, controlling the valve 27. Formed on the rod 26, is a shoulder 31 for limiting the collar 30 in its upward movement. By depressing the rod, the float chamber may be flooded.

Leading from the bottom portion of the bowl 21 through the air inlet passage 11 is, as particularly shown in Figs. 3 and 4, an auxiliary fuel duct 32 and a main fuel duct 33. The ducts are closed at their outer extremities by plugs 34 preferably screw threaded into the said ducts so that the said plugs may be easily removed for draining the fuel bowl. Upstanding from the duct 32 is an auxiliary fuel nozzle 35 projecting into the lower extremity of the auxiliary moisture passage 15and terminating, at its upper end within the throat 16 of thesaid passage. Upstanding from the main fuel duct 33 is a main fuel nozzle 36 projecting upwardly within the air inlet passage 11 and terminating at its upper end within the throat 12 of the said passage. Mounted to cooperate with the main fuel duct is a needle valve 37.

The needle valve 37 is formed with a screw threaded upper terminal 38 adjustable Within a socket or sleeve 39 supported by a spider 40 projecting from the Walls of the mixing chamber 13. Extending into the said chamber below the socket 39, is a bracket 41 formed, at its outer extremity, to rotatably receive the needle valve with the said bracket providing a guide therefor. The upper extremity of the needle valve is squared and slidably fitted thereon to rest upon the bracket 41 is a worm 42.

Projecting laterally from one side of the body 10 at the mixing chamber 13 is a cylindrical shell or casing 43, reduced adjacent its inner extremity to form a shoulder 44 and providing a suction chamber 45 comupon a suitable boss formed onmunicating with the mixing chamber. At the inner terminal of the shoulder 44, the body 10 is formed with an annular flange 46.

Snugly fitted within theshell 43 to reciprocate therein, is a hollow open ended plunger 47 held against displacement by a stop collar 48 screw threaded upon the outer terminal of the shell. Formed on the outer extremity of the plunger 47 is a yoke49 upon which is rotatably mounted a valve actuating rod 50 for the needle "valve 37. Screw threaded upon the outer extremity of the said rod is a locking nut 51 therefor. The rod 50 projects into the mixing chamber 13 at one side of the worm 42'and is slidably received, at its inner end, by a socket 52 formed integral with the bracket 41 and the adjacent side of the chamber. Formed on the inner extremity of the rod to cooperate with the worm 42 is a worm rack 53. Threaded through the "plunger 47 is a set screw 54 having the rod 50 loosely. fitted therethrough and formed, at its inner end, to engage with a spring 55 hearing between the said set screw and the flange 46. The spring 55 will thus act to normally urgethe plunger 47 outwardly within the shell 43 to engage the stop collar 48 with the set screw 54 operable for tensioning the said spring.

R'otatably fitted through the mixture discharge passage 14 immediately above the spider 40 are spaced parallel valve rods 56 wall of the mixing extending diametrically of the said passage and mounted upon the said rods are the coacting sections of a throttle valve 57. These valve sections, at the confronting ends there of, are provided with annular enlargements 58 upon which are formed coacting longitudinally extending teeth. Therefore, when either of the rods 56 is operated, both of the valve sections will 'be simultaneously moved to either open or close the valve. In this connection, attention is directed to the fact that in thus forming the throttle valve, the coacting sections thereof will shift up- Wardly within the passage 14 an equal distance when the valve is opened and an equal volume of the fuel mixture thus allowed to flow around both sides of the valve so that the said fuel mixture will be uniformly distributed to the cylinders of the engine. Connected to the laterally projecting outer end of one of the rods 56 are levers 59 adjustably secured at their inner ends to the said rods. The normal position of the levers with respect to the valve 57 may consequently be easily regulated.

It is now to be observed that the passage 17 from the auxiliaryimixture passage 15 19, practically all of the air entering the passage 11 will be drawn through the passpaced sockets 19 to receive such a rod.

After the engine has been started, the valve 19 is closed and the flow of air through the passage 11 controlled by the valve 57. All of the air entering the said passage will, when the valve 19 is so closed, flow up through'the said passage, through the mixing chamber 13 and out through the discharge passage 14. Attention is now directed to the fact that with the plunger 47 disposed in normal'position against the collar 48, the rod 50 may be rotated to turn the worm 42 and rotate the needle valve 37 within the socket 39 to accordingly adjust the normal position of the said valve with respect to the discharge end of the main fuel nozzle 36. Consequently, when the valve 57 is closed and the engine is running idly, sufficient fuel may be drawn from the said fuel nozzle by the suction within the mixing chamber 13 to deliver a relatively rich mixtureto the engine. However, as the valve 57 is opened, the speed of the engine will, of course,'accord'ingly increase to proportionately increase the suction within the mixing chamber. This suction in the mixing chamber will be communicated to the suction chamber 45 in the shell 43 and 'will act upon the plunger 47 to draw the plunger inwardly within the shell against the tension of the spring 55. Inward movement of the plunger 47 will, of course, shift the rod 50 longitudinally with respect to the worm 42, causing the worm rack 53 to rotate the said worm and correspondingly rotate the valve 37 within the socket 39 to adjust the said valve downwardly toward the main fuel nozzle 36 indirect proportion to the inward movement of the plunger 47 and correspondingly shut ofi the supply of fuel from the said valve. Consequently, the richness of the mixture will be reduced in direct proportion as the speed of the engine is increased, since the fuel supply will be diminished' as the suction within the fuel chamber is increased by any increase in the engine speed. Therefore, for idling or low engine speeds, a rich mixture will be delivered through the discharge passage 14 while for higher speeds, a correspondingly leaner mixture will be produced to thus insure quick firing and corresponding power of the engine when the speed thereof is accelerated.

Since practically no air can enter past the plunger 47, fluttering of the valve 37 cannot occur. 54 may be adjusted to vary the tension of the spring 55' for regulating the resistance of the plunger 47 to the suction within the mixing chamber so that the travel of the said plunger for adjusting the valve 37 toward the main fuel nozzle may be easily controlled. The extreme inward movement of the plunger is, of course, defined by the shoulder 44. The normal level of the gasolene in the fuel nozzles 35 and 36 may be controlled by means of the float 29.

It will, therefore, be seen that I provide an exceedingly simple and efficient construction for the purpose set forth, with the carbureter adapted to deliver a homogeneous fuel mixture at all engine speeds.

Having thus described the invention, what is claimed as new is:

As will now be clear, the set screw 0 1 1. In valve mechanism for carburetors, a

casing, a nozzle opening within the casing, a valve rotatably adjustable with respect to the nozzle, and means reciprocable for rotatably positioning the valve with respect to the nozzle to control the discharge therefrom, said means being directly connected with the valve and manually rotatablefor positively adjusting the valve in opposite directions to regulate the normal position of the valve relative to the nozzle.

2. The combination with a casing, of a nozzle opening within the casing, a valve rotatably adjustable with res ect to the nozzle, a rod operatively engage with the valve and reciprocable for rotatably positioning the valve with respect to the nozzle to control the discharge therefrom, yieldable means resisting reciprocation of the rod, and means for regulating the resistance of said yieldable means and rotatalbly receiving the rod therethrough.

3. The combination with a casing, of a nozzle opening within the casing, a valve rotatably adjustable with respect to the nozzle, a rod operatively engaged with the valve and reciprocable for rotatably positioning the valve with respect to the nozzle to control the discharge therefrom, means supporting the said rod for reciprocable movement, yieldable means coacting with said first mentioned means for resisting reciprocation of the rod, and means adjustable upon the said first mentioned means fo regulating the resistance of the said yieldable means.

4. The combination with a casing, of a nozzle opening within the casing, a valve rotatably adjustable with respect to the nozzle, a Worm slidable upon the said valve, and a rod having a worm rack coacting with the said worm, said rod being reciprocable for rotatalbly )0Siti011ing the valve with respect to the nozzle to control the discharge therefrom and bein justing the va ve in opposite directions to regulate the normal position of the valve relative to the nozzle.

5. The combination With a casing having a passage therethrough, of a sleeve supported in said passage, a bracket projecting into the passage in spaced relation to the sleeve, a nozzle, a valve received through said bracket and rotatably adjustable within said sleeve With respect to the nozzle, a Worrn slidably receiving the valve therethrough and supported thereon by the said bracket,

manually rotatable foradthe said Worm bein the valve, and a rod iaving a Worm rack coacting with said Worm and reciprocable for rotatably positioning the valve with respect to the nozzle to control the discharge therefrom, said rod being manually rotatable for turning said Worm to adjust the valve in opposite directions and regulating the normal position of the valve relative to the said nozzle.

,7 In testimony whereof I aflix my signature.

JOSEPH C. WALTON. [1 s.l

operable for rotating

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