US1556664A - Carburetor - Google Patents

Description

Oct. 13,1925- L. M. WOOLSON CARBURETOR Filed June 26, 1920 w M w a Patented Oct. 13, 1925.

UNITED STATES 1,556,664 PATENT OFFICE.

LIONEL M. WOOLSON, OF DETROIT, MICHIGAN, ASSIGNOR T0 PACKARD MOTOR CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

oannnan'ron Application filed June 26, 1920, Serial No. 881,954.

To all whom it may concern."

Be it known that I, LIONEL M. WooLsoN, a citizen of'the United States,'and resident of Detroit, Wayne County, State of Michigan, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates to hydrocarbon motors, and particularly to carbureting means therefor.

One of the objects of the present invention is to provide a carburetor with automatic means for increasing and decreasing the flow of air through the air passage so that the correct proportion of airand gasoline may be obtained at all speeds.

In general, the invention comprises an air passage and a fuel nozzle with a valve sliding in the air passage to vary its effective area.

Other objects and advantages of the in vention will appear from the following description taken in connection with the drawings which form a part of this specification, and in which Figure v1 is a vertical sectional view of a carburetor, and the adjacent part of a motor, built in accordance with this invention;

Figure 2 is a detail view showing another form of certain of the arts; and

Figure 3 is a plan view of Figure 2.

Referring to the drawings, 10 represents a cylinder block, which may comprise one or more cylinders, and 11 is the motor intake conduit connected to the cylinder block as by bolts 12. A throttle valve 13 is arranged in this conduit and may be opened and closed by any suitable connections.

Secured to the intake conduit.11, as by bolts 14, is a carburetor 15, the principal elements of which are a float chamber 16, of well known form, a main air intake 17, an auxiliary air intake 18, and a mixing chamber 19 with which the air intakes 17 and 18 communicate. As shown, the main air in.- take or passage 17 is controlled by a choke valve 20, and the auxiliary air intake or passa e 18 is controlled by a spring closed valve 21, and both of these valves may be adjusted by the operator through a rod 22 and the connections shown.

A mixing tube 23, with its interior in the form of a Venturi passage, communicates directly into the mixing chamber 19.

through the tube 23 and is provided with upper and lower outlets, the upper outlet 27 being approximately at the level of the upper end of the tube 23 and discharging lower outlet or port 28 is arranged approximately at the throat 29 of the tube 23. This lower outlet 28 is also slightly above the level maintained by the float chamber so that there will be no. leakage from the fuel nozzle when the motor is not running.

Arranged to slide within the upper part of the tube 23 is a valve 30 which is show-n in the form of a ball sliding directly on the upper part of the fuel nozzle 25 and between the outlets 27 and 28 thereof. The ball is retained on the fuel nozzle by spinning the upper end of the latter outwardly, as shown at 31, after the ball has been placed on the upper end of the nozzle. A shoulder 32 on the nozzle just above the outlet 28 determines the lower position of the ball valve 30. When the valve 30 is in its lowest position as when the motor is throttled and running idle, as shown in full lines in Fig. 1, the passage throu h the tube 23 is very nearly closed, there eing only a slight annular space between the valve and the'upwardly flared interior wall of the passage. In this throttled condition of the motor there is very little depression in the mixing chamber 19 though there is a high depression on the other side of the throttle 13 in the intake conduit. Under these conditions there is only a small fiow of gasoline from the noz-' zle 25.

As the throttle valve 13 is opened there is a greater flow through the mixing chamber 19 and the greater suction will raise the valve 30 from its lower position and at the same time the auxiliary air valve 21 will be opened to supply additional air. As the maximum open position of the throttle valve is approached, the valve 30 will be raised The to the dotted line position shown in Fig. 1 and the opening through the tube 23 is then much larger and the suction is also much greater both above and below the valve 80 so that fuel is drawn through both of the openings 27 and 28 of the fuel nozzle.

With the above operation of the valve 30, in cooperation with the auxiliary air valve 21, which may be manually adjusted, an approximately correct mixture is obtained 'at various speeds of the motor.

shown in dotted lines in Figure 2, so that the passage through the tube may be still further enlarged at high suction.

A specific embodiment of the invention has been described in detail and will be specifically claimed, but it will be understood that the invention is not limited to the exact details of construction shown, as it will be apparent that changes may be made without departing from the spirit or scope of the invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: l

1. In a carburetor, the combination with means forming an air passage and a fuel nozzle extending into the air passage and having upper and lower outlets, of a valve movable on the nozzle between said outlets.

2. In a carburetor, the combination with a fuel nozzle having upper and lower outlets and an air tube surrounding said nozzle, of

sliding on the nozzle between said outlets.

4. In a carburetor, the combination with a mixing tube and a fuel nozzle having upper and lower outlets with the upper outlet approximately at the level of the upper end of the mixing tube, of a valve sliding between said outlets.

In a carburetor, the combination with an upwardly flared mixing tube, and a fuel nozzle extending into the tube and having upper and lower .outlets, of a sliding valve operating between said outlets.

6. In a carburetor, the combination with a Venturi mixing tube and a fuel nozzle having upper and lower outlets, the lower outlet being approximately at the throat of said tube, of a valve sliding between said outlets.

7. In a carburetor, the combination with a Venturi mixing tube and a fuel nozzle extending into the tube and having an upper outlet approximately at the level of the upper end of the tube and a lower outlet approximately at the level of the throat of the'tube, of a valve sliding between said mitlets.

In testimony whereof I aflix my signature.

LIONEL M. WOOLSONL

Images