US1324510A

US1324510A - Carbureter

Info

Publication number: US1324510A
Authority: US
Publication date: 1919-12-09
Anticipated expiration: 1936-12-09

Description

H. L. McCURDY.'

CARBURETER,

APPLICATION FILED IAN. 7. 1918.

1 324,5 10. Patented Dec. 9,1919.

2 SHEETSSHEET I.

amen 6oz \\m cm A3 (I mick/ M H. L. McCURDY.

CABBURETER.

APPLICATION FILED JAN. 1. 1918.

1 324,5 1 0. Patented Dec. 9, 1919.

2' SHEETS-SHEEI 2.

7 l2 2 V v 28% 1s 23 37 A To all whom it may concern:

UNITED STATES PATENT orrron.

HORACE L. M OCURDY, OF OAKWOO MICHIGAN, ASSIGNOR TO EDWARD MOZLOW, OF

' OAKWOOD, MICHIGAN.

I k GARBURETER.

Specification of Letters Iatent.

Application filed January 7, 1918. semi No. 210,013.

Be it known that I, HORACE L. MOOURDY, a citizen of the United States, and residin at Oakwood, in the county of Wayne and State of Michigan, have invented a new and Improved Carburetor, of which the following is a specification.

This invention relates to devices for carbureting liquid fuel for internal combustion engines, and its object is to provide a' valve to control the flow of fuel into the carbureting chamber which valve shall be opened in proportion to the movement of an actuating member, and to provide a valve operatively connected to the fuel valve to control the fiow of air through the carbureting chamber whereby the reduction of air pressure in the carburetin chamber may be varied to cause they pro notion of mixtures of the proper richnesses for the difi'erent conditions of operations of the engines.

This invention consists in the details of construction illustrated-in the accompany-.

ing drawings and more particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of this improved carbu-' reter. Fig. 2 is a plan thereof. 7 Fig. 3 is a central vertical section at right angles to Fig. 1.= Figs. 4 and 5 are sections on the line 44 of Fig. 3, showin the air valve in two diflerent positions. ig. 6 is a view of the fuel valve and its operating stem. Fig. 7 is a view of the air valve. Figs. 8,

9 and 10 are views of the same valve from.

diflerent sides. Fig. 11 isa detail sectional view on a larger scale of the upper end of fuel passage.

Similar reference characters refer to like parts throughout the several views.

The ,carbureter shown in-the drawings has a float chamber 1 having a top 2 that constitutes the bottom of the valve or carbureting chamber. A threaded sleeve 3 connects to any source of fuel supply,and the small fuel passage 4 may be closed by the float valve 5 that rests on a plate 6 carried by the float 7 which is pivoted on the pin 9 carried by two arms 10. This construction forms no part-of my invention.

A tube 12 screws up into the top 2 of By turning back tins plu the float cham- Patented Dec. 9, 1919.

ber'mav be drained throug the passages 16,

17 and 19. A nut 20 on the lower end of the tube 12 holds the float chamber and drain by the projection 30 on the arm 26. Any

other operating device for the valves may be employed.

Extending down through the valve stem 25 is a 'stem 32 which is held from turning in the stem 25 in any desired manner. As shown in Fig. 2, the stem 25 is formed with radial slots 33 and the fingers formed thereby maybe caused to grip the stem 32 by means of a nut 34. The stem 32 has a tongue 38 at its lower endthat extends into a slot in the upper end of the valve 35. Pins 36 extend through this stem 32 and position it relative to the stem 25.

The valve 35 is shown in Figs. 3 and 6 to consist of the hollow lower threaded portion 37 having transverse passages 40 just below the shoulder 39. The upper end of the tube 12 is locked to the to 2 by means of a nut 42, and the upper end of the passage 13 is counterbored to form a cup shaped depression 41, the upper end of which is slightly larger than the shoulder 39. In a carbureter adapted to the Ford cars the eiiective distance between this shoulder and the wall of eter of the shoulder is .185 inch and the A diameter of the threaded portion 37 is .1285 inch. The wall of the cup at the upper end of the tube 12 are preferably at an angle of 60 degrees to the horizontal. These dimensions are not necessarily the best for all engines but good results have been obtained with many hundred carbureters embodying them.

A butterfly-valve ll'on the stem is shown mounted on the intake passage 46. The valve 24 has a circular outlet opening which registers with the outlet passa e 4.8 when the valve is entirely open, as s own in Figs. 3 and 4, but which is nearly closed when the engine is idling, as shown in Fig. 8. As shown in Fig. 9, the'oval inlet opening49 in this valve is slightly smaller thanthe outlet opening, .which will cause a slight decrease in pressure or increase in suction within the valve and a slight proportional increase in the flow of fuel when the air valve is entirely open.

When the engine is idling, the proportional flow of fuel is reduced by forming a hole 50 in the wall of the valve, as shown in Fig. 10, which will register with the intake passage 46, and thereby reduce the suction within the valve and thereby reduce the proportional How of fuel. When the air valve is opened for low working speeds, the two auxiliary passages 51 are uncovered and register with the inlet passage 46, thus again reducing the richnessof the mixture; Not until the engine is working at more than half its full capacity does the air inlet increase more slowly in size than the outlet 47.

It will be remembered that the effective distance that the fuel valve is opened depends entirely on the distance it is turned, but the flow of fuel will also depend upon the suction, and this will be greatest when the valve is in the position shown in Fig. 4. T he suction will be least when the engine is idling, so that the leanest mixture will then pass to the engine. The mixture will slowly become richer after the passages 51 have registered with the inlet passage 46.

The details and proportions of the various parts of this carbureter may be changed by those skilled in the art without departing from the spirit of my invention set forth in the following claims.

I claim l. in a carbureter, the combination of a float chamber having a central vertical screw threaded discharge passage, a hollow rotatable fuel valve screwed into the passage and having a circumferential shoulder just above the upper end of the passage anc. radial holes through its wall just below the shoulder, a cylindrical oarbureting chamber above the iioat chamber and concentric with the fuel valve, an air valve rotatable therein and provided with radial inlet and outlet threaded discharge passage, a rotatable fuel valve screwed into said passage and provided with discharge openings, a cylindrical mixing chamber and a cylindrical air valve mounted above the float chamber concentric with the fuel valve and extending below said discharge openings in the fuel valve, said air valve and carbureting chamber having radial inlet and outlet passages, and means connecting the air and fuel valves to cause them to turn together but permit longitudinal movement between them.

3. In a carbureter, the combination of carbureting and float chambers, a stem extending from the bottom of the float chamber to the-carbureting chamber, and having a transverse passage at its lower end, and a longitudinal passage extending therefrom to the carbureting chamber, a screen over the transverse passage, a second transverse passage below the first and independent thereof, a longitudinal passage extending downwardly therefrom, and a valve to close the lower end of said second longitudinal passage said carbureting chamber having inlet and outlet openings.

4. ln a carbureter, the combination or a cylindrical carbureting chamber having an air inlet and an'outlet for the explosive mixture, an air valve rotatable therein and formed with a circular outlet and with an oval main inlet and smaller auxiliary inlets, a fuel passage connecting into the bottom of said chamber, a fuel valve co-axial with the air valve rotatable in said passage, and means connecting said valves so as to cause them to turn together.

5. in a carbureter, the combination of a cylindrical carbureting chamber and an air valve rotatable therein, a tubular fuel passage connecting into the bottom of said chamber co-axially with the air valve and having its upper end cupped and internally threaded, a fuel valve having a tubular lcwerend screwed into said passage and a shoulder just above radial holes connecting into the space in the lower end of the valve, said shoulder being adapted to move in and out of the cupped end of the passage as the i valve is turned to regulate the flow of fuel into the carbureting chamber, and means connecting said valves so asto cause them to turn together.

6. in a carbureter, the combination of a float chamber having a top and a central vertical screw threaded discharge passage in said top, a hollow rotatable screw-threaded iZE fuel valve mounted in said passage and havopenings, a valve chamber containing the ing a transverse notch in its upper end and air valve and having inlet and outlet openradial holes at the upper face of the top of ings, a central stem adjustably mounted in 10 the float chamber, a hollow air valve having the air valve having a flattened lower end 5 an open lower end rotatably mounted on extending into the notch in the fuel valve,

the top of the float chamber concentric with and means to turn said air valve. the fuel valve, and having inlet and outlet HORACE L. MOCURDY.