US2333030A - Carburetor - Google Patents

Description

Oct. 26,1943. P. A. R. MEYER CARBURETOR Filed Feb. 26, 1942 4 Sheets-Sheet l Oct. 26, 1943.

P. A. R. MEYER CARBURETOR Filed Feb. 26, 1942 4 Sheets-Sheet 2 P. A. R. MEYER 2,333,030

CARBURETOR Filed Feb. 26, 1942 Oct. 26, 1943. I

4 Shets-Sheet 3 Oct. 26, 1943. -P. 'A. R. MEYER CARBURETOR Filed Feb. 26, 1942 4 Sheets-Sheet 4 ZIJ 4.? 3110mm PETE/FA. R HEYE/F Snow-m Patented on. 2c, 1943 CABBURETOR Peter A. B. Meyer, College Point,

, Long Island, N. Y.

Application February 26, 1942, Serial No. 432,485 4 Claims. (01.261-62) This invention relates to carburetors and it is one object of the invention to provide a carburetor having an improved arrangement of upper and lower venturis and also an improved arrangement of air and fuel passages so that when the carburetor is in use, the correct mixture of air and fuel may be obtained, according to the speed at which an engine is running and also according to a load pulled by theengine.

Another object of the invention is to provide the upper venturi with fuel passages so arranged that when the engine of a motor vehicle is running at low speed, fuel will be delivered through an upper set of fuel outlet openings through the venturi, whereas, when the speed is increased, fuel will be automatically caused to be delivered through a lower set of fuel outlet openings in the venturi, flow of fuel through the lower set of openings being controlled from the lever by means of which the throttle valve of the carburetor is adjusted.

Another object of the invention is to provide the carburetor with a combined air valve and fuel spreader mounted in such cooperating relation to the upper venturi that during operation of the carburetor, fuel dischared onto the spreader will be taken up by incoming air and carried into the mixing chamber of the carburetor where it is thoroughly mixed with the air to form a combustible mixture which passes from the carburetor to the engine.

Another object of the invention is to so mount Y the combined air valve and fuel spreader that it will be yieldably held against inward movement by springs, one of the springs being engaged by a lever actuated from a choke device in the instrument board of the automobile so that, when necessary, the driver of the automobide may actuate the choke and swing the lever upwardly to increase the tension of the spring engaged by the lever and thus abnormally retard inward movement of the air valve.

Another object of the invention is toprovide the carburetor with a throttle so formed that when it is swung toward open position, fuel which gathers on the valve may drain therefrom into the path of air moving through the venturi having passages in its walls which assist in effecting a good mixture of air and fuel.

Another object of the invention is to provide an improved carburetor which is simple in construction, eillcient in operation, and not liable to get out of order. 1

In the accompanying drawings:

Fig. 1 is a side elevation of the improved carburetor.

Fig. 2 is a view taken on the line 22 of Fig. l, and looking down upon the top of the carburetor.

Fig. 3 is a view looking from the right of Fig. l, with a portion of the fuel chamber in section.

Fig. 4 is a view on the line 4-4 of Fig. 3.

Fig. 5 is a sectional view taken vertically through the carburetor, on the line 55 of Fig. 4.

Fig. 6 is a sectional view taken horizontally through the carburetor on the line 68 of Fig. 5.

Fig. 7 is a similar view on the line l'l of Fig. 5.

Fig. 8 is a view looking at the lower end of the carburetor.

Fig. 9 is a view showing the upper venturi choke and its connection with the choke. lever of the carburetor.

Fig, 11 is a view showing the throttle valve in plan, with a portion of its shaft in section.

Fig. 12 is a fragmentary sectional view on the line iZ-IZ of Fig. 11.

This improved carburetor has a. body i formed of strong metal and of hollow cylindrical formation to define a mixing chamber 2 Within the body. At one side of the body is the fuel chamher 3 having a recessed extension t at one end, and below the fuel chamber the body is formed with a neck 5 about the lower end of which is an outstanding flange ii for connection with the intake manifold of an engine. The open upper end of the fuel chamber is closed by a cover 1 formed integral with a ring 8 resting on the upper end of the body i. Threaded sockets are formed in the cover '5 and in an ear or lug 9 projecting from the body, in order that a sleeve it, constituting an air inlet connection for the carburetor, may be secured by screws H and i2 which pass through the car 63 and the anchoring plate M at opposite sides of the sleeve.

A Venturi ring I5 is mounted in the upper end portion of the body and is formed with upper and lower sloping surfaces 16 and H and a throat It through which open upper and lower ports 19 and 2t leading from the upper and lower from the fuel pot into the lower groove of the Venturi ring and discharged through the lower ports 20. When the vent is closed,fuel will be drawn into the lower groove and discharged through the lower ports.

Fuel is delivered to the fuel chamber through a .nipple 28 mounted through an opening 21 formed in the end wall of the recess 4 and has its outer portion threaded for connecting with a feed tube or pipe leading from a source of supply. The inner portion of the nipple forms a valve housing 28 having a valve seat formed therein for engagement by a. needle valve 29. This needle valve projects from the valve housing and is engaged by an abutment plate 30 extending upwardly from the hinge strip 3| of the float 32. This hinge strip is pivoted about a hinge pin 33 mounted transversely through the recess and as the float is moved upwardly the abutment plate presses the needle valve through the valve housing 28 until it seats against the valve seat and shuts off flow of fuel into the fuel chamber. Therefore, fuel or gasoline in the fuel pot cannot rise above a predetermined level and a predetermined quantity of gasoline will be maintained in the fuel chamber.

Fuel discharged from the ports l9 and 20 should be spread so that it will be taken up and mixed with air entering the mixing chamber 2 through the air inlet Ill. To accomplish this, there has been provided a combined air valve and fuel spreader 35. This valve and spreader is of hemispherical concavo convex formation and of such diameter that a slight crevice or space is present between its periphery andthe throat 18 of the Venturi ring IS. A depending tubular neck 36 is located centrally of the spreader about an opening therein and through this neck passes a rod or stem 31 which is slidably mounted through an arm or bracket 38 carried by and extending radially of the ring 8. The rod or stem is in the form of a bolt having a head 39 at its upper end and a, nut 40 upon its lower end portion which constitutes a lower head for the rod. A spring M which fits about the rod and the neck 3t, urges the valve or spreader upwardly against a wear-resisting washer 62 and this spring is compressed and tensioned by adjustment of the nut or lower head 30. A second spring 53 fits about the upper portion of the rod between the head 39 and forks M of a lever arm 55. The lever arm is fixed to a choke shaft 66 Which is rotatably mounted through bearings 51 carried by the air inlet sleeve Ill or by the ring 8. and protruding ends of the choke shaft carry lever arms or handles 48 so that by imparting swinging movement to one of these choke levers or handles, the choke shaft may be turned and the lever arm 45 swung upwardly to exert added tensioning pressure upon the upper spring and thus impart increased resistance to downward movement of the spreader valve 35. Under normal conditions, air sucked inwardly through the air inlet sleeves will shift the spreader valve downwardly but, when the choke lever is moved to swing the lever arm 45 upwardly, tension of the springs 43 and 4| will be increased suillciently to retain the spreader valve in its raised position and suction of air passing through the Venturi ring will be greatly increased and a richer fuel mixture created.

Choking of the carburetor is accombuished by choke mechanism mounted through the instrument board 49 or panel in front of the driver of the motor vehicle. This choke mechanism is illustrated in Fig. 10 and has atubular choke casing 50 which passes through an opening II in the instrument board. An abutment collar or nut 52 is mounted on the casing in position for engagement with theinstrument board and, in order to yieldably resist rearward or outward movement of the casing, there has been provided a spring 53 coiled about the casing with one end abutting the instrument board and its other end bearing against the nuts 54 which are screwed on the casing from the front end thereof. A handle 55 is carried by the casing in order that it may be easily pulled outwardly. Through the bore of the casing 50 passes a rod 58 having a knob 51 at its outer end and the front end of the rod is connected with a toggle I54 by a pin Fl. The toggle is pivoted to one lever 4! by a pin 54'.

When it is desired to choke the carburetor for starting a cold motor, the knob 51 is grasped and pull exerted to swing the choke lever rearwardly and turn the choke shaft 46 to swing the lever arm 45 upwardly. This applies added tension to the upper spring 43 and also shifts the rod I1 upwardly a short distance to apply added tension to the lower spring and choking of the air inlet will take place. When more power is needed in order to pull up a steep hill. through sand or mud, or compensate for a heavy load, the handle 56 is grasped to pull the choke casing II rearwardly and, since the rod 56 carries a collar 60 hearing against the rear end of the casing, the rod will be shifted rearwardly with the casing and the springs 48 and 4| given added tension. This choking is to a greater extent than when merely choking for starting a cold engine as the casing 50 may be shifted rearwardly until the spring 53-is compressed to its full extent. The rod can only be shifted rearwardly until the rear end of the toggle 58 strikes the front end of the casing.

A throttle valve is mounted in the neck 5 and consists of a metal disc BI can'ied by a throttle shaft 52. This shaft is rotatably mounted through bearings 83. A protruding end of the shaft carries a lever 64 for engagement with an actuating rod so that the driver of the vehicle may adjust the throttle valve and the hub of this lever carries a cam 66 engaged by a roller 6'! at the lower end of a lever 68. This lever extends vertically and is pivotally mounted between beaning brackets 69 by a pin 16 which also carries a spring 1i having an upper arm bearing against the fuel pot and a lower arm engaging the lower portion of the lever arm. The spring urges the lower end of the lever toward the cam for engagement therewith and, when the lever arm 84 is moved to turn the shaft 82 in a direction for opening the throttle valve, the spring 1! will tilt the lever 68 about its pivot and the block 14 at the upper end of this lever will move into closing engagement with the outer end of the air vent 2!. Therefore, entrance of air through the port 25 will be prevented and fuel will be drawn through port 24 into the lower groove 22 of the Venturi ring I5 and be discharged through the ports 20 valve.

onto the spreader valve instead of fuel being merely drawn through the upper port 23 into the upper groove 2| and through the upper-ports l8 onto the spreader valve.

Referring to Figs. 5, 6 and 11, it will be seen that the throttle valve 8| has one side portion I8 curved upwardly to provide a lip from which gasoline will be blown in a thin sheet. The air and gasoline carried thereby pass downwardly until they strike the curved surface 18 of the neck 5. This deflects the air and gasoline toward the center of the neck and creates a churning action to thoroughly mix the gasoline with air passing through the neck at the other side of the throttle An opening 11 controlled by a threaded pin or screw 18 is formed through the valve disc and the shaft 82 so that air may pass through the throttle valve when closed to idling position. The flange 8 at the lower end of the neck has a beveled surface 19 in order that it may serve as a lower venturi. Walls of the lower flange or venturi are bored to provide a channel 88 having inlet ports 8i opening through the curved deflecting surface I8 and outlet ports 82 opening through the beveled surface 18. By providing the channel and its ports, gasoline flowing along the wall of the neck mayenter the channel through the entrance ports 8| and be discharged through the ports 82 in spaced relation to each other circumferentially of the venturi. The jets of gasoline discharged through ports 82 mix with air and form a very combustible mixture.

When this carburetor is in use, the flange 8 is secured to the intake manifold of an engine and the nipple 28 connected with a tube or pipe leading from the fuel tank. The engine is started and during the starting operation, the choke 88 may be drawn outwardly to apply tension to the upper spring and cause a richer mixture to be fed to the engine by imparting added resistance to downward movement of the spreader valve. The

, choke rod is' then released and normal tension is applied to the spring so that the two springs yieldably resist downward movement of the spreader valve to a normal degree. When the engine isincoming air which exerts downwardly force upon the spreader valve and depressed this valve. As the speed of the engine is increased, the incoming air forces the spreader valve downwardly to a lowered position below the ports 28 and, since turning of the throttle shaft to open the valve 8! is efiected by movement of the throttle lever, movement of the cam 88 with the throttle lever will permit the lever 88 to swing to a position for closing the air vent 25. Flow of air through this air vent will then be blocked and fuel will then flow through the lower port 24 into the lower groove 22 of the Venturi ring and out through its discharge ports 20. Feeding of fuel will thus be proportionately increased as the throttle valve is opened for high speed. When pulling a steep hill or driving the vehicle through sand or mud, the handle 55 is grasped and pull exerted to draw the choke casing 88 outwardly and this causes the choke shaft 48 to be turned in a direction to swing the arm 45 upwardly and exert upward pressure on the upper spring 48 to compress said spring and shift the stem or rod 3?! upwardly to compress the lower spring. Therefore, the spreader valve will be shifted upwardly toward a choked position and a richer mixture will be fed to the engine. When the throttle valve is in its idling position, a rich mixture is delivered to the neck 8 and gasoline flowing downward at the curved side of the valve disc 8| is diverted by the curved surface 18 of the neck and thoroughly mixed with air under the throttle valve. Gasoline and carbureted air which enters the channel 88 through the ports at is discharged through the ports 82 of the lower venturi and a good combustible mixture is assured.

Having thus described the invention, what is claimed is:

1. In a carburetor, a hollow body defining a mixing chamber having an air inlet at its top and an outlet neck extending from its lower end, a Venturi ring in the upper end portion of the body having discharge ports spaced from each other circumferentially thereof. a choke valve shiftable vertically through the Venturi ring and constituting a fuel spreader, spring means for yieldably resisting downward movement of the choke valve, a throttle valve in the outlet including a rotatable shaft and a valve disc carried by the shaft and having one side portion bentupwardly to provide a lip, means for turning the shaft to open and close the throttle valve, and a venturi at the lower end of the outlet neck having a curved deflecting surface under said lip and a circumferentially extending beveled inner surface below the deflecting surface, the lower venturi being formed with a circumferentially extending channel having an inlet port'leading from the deflecting surface and outlet ports opening through the beveled inner surface. 2. In a carburetor, a hollow body defining a mixing chamber having an air inlet at its top and an outlet neck extending from its lower end, a fuel chamber at one side of the body, a Venturi ring in the upper end portion of the body having discharge .ports in communication with the fuel chamber, a choke valve shiftable vertically through the Venturi ring, a throttle valve in the outlet neck having an inwardly curved deflecting surface having an upturned portion at one side, and a venturiabout the lower end of the neck having an inwardly curved deflecting surface -under the upturned portion of the throttle valve.

the lower venturi being formed with a circumferentially extending channel having inlet ports leading from the deflecting surface and outlet ports'opening through the beveled inner surface of the venturi.

3. In a carburetor, a hollow body defining a mixing chamber having an air inlet at its top and an outlet neck extending from its lower end, a fuel chamber at a side of the body, a Venturi ring in the upper end portion of the body having discharge ports in communication with the fuel chamber, a choke valve shiftable vertically through the Venturi ring and yieldably held against downward movement, a throttle valve in the outlet neck including a rotatable shaft and a valve disc carried by the shaft, the valve disc having an edge portion at one side of the shaft bent upwardly, a portion of the wall of the neck under the bent portion of the valve disc being curved inwardly and forming a deflecting surface to impart churning motion to the fuel and air under the throttle valveand efiect thorough mixture thereof to create a highly combustible mixture, and the lower end portion of said neck being formed with a circumferentlally extending channel having inlet passages leading from said defleeting surface and outlet passages opening through the inner surface of the neck below the deflecting surface.

4. In a carburetor, a hollow body defining a mixing chamber having an air inlet at its top and an outlet neck extending ifrmn its v lower end, a fuel chamber at one side of the body, a Venturi ring in the upper end portion of the body having discharge ports in communication with the fuel chamber, a choke valve shiftable vertically through the Venturi ring and constituting a fuel spreader, spring means for yieldably resisting downward movement of the choke valve, means for imparting added tension to the spring means during choking oi the air inlet, a throttle valve in the outlet neck including a rotatable shaft and a valve disc carried by the shaft, the valve disc having an edge portion at one side 0! the shait bent upwardly, the lower end of the neck being extemally thickened to iorm a collar surround-'- ing the neck and having its lower end internally beveled, the neck being internally thickened for a portion of its circumference under the bent portion of the valve disc for forming a vertically curved deflecting surface within the neck, and

said collar being formed with a circumierentially i A. R. MEYER.

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