US1634461A - Carburetor - Google Patents

Description

1,634,461 July 5 1927 w. GRlKscHElT I CARBURETOR Filed Sept. y25. 1922 2 Sheets-Sheet 1 @woe/whoa July 5', 1927.

alter/wem Patented July 5, 1927.

UNITED STATES WILLIAM omxscnm'r, or Dn'rnorr, Niemann..

CARBURETOR.

Application med. Septembei' 25, 1922. Serial No, 590,472.

The invention'relates to carburetors and' has for one of itsl objects the provision of a carburetor havingmeans effected by the suction producing means'of the carburetor for drawing liquid fuel thereinto, and also meansfor preventing the siphoning of the liquid fuel thereinto. Another object is to provide u carburetor provided with an emul- "fying chamberv discharging into --the prilo mary air and with means for automatically varying the supply ot liquid fuel and primary` air upon variation in the pressure in the carburetor outlet. Otherobjiects of the invention reside in the novel features of conte struction .and combinations and arrangements ot parts as more fully hereinafter set forth.

lin the drawings:

Figures 1 and 2 are transverse cross secao tions through the carburetorv on the lines 1--1 and 2--2 respectively. y

1 is the outlet in the bodyT ofthe carburetor and 2 the primary air inlet below the outlet and communicating therewith. 3 is a throttle valve in the-outlet and Il is a choke valveV within the primary air inlet. 5 is an upwardly extending cylindrical guide through the primary air inlet and spaced from its side walls, and 6 is an auxiliary air tube formi-ng the emulsifying chamber, this air tube being slidable within the guide 5 and having a lower open end communicating with the lateral air passage 7 in the carburetor body, which in turn opens into the vertical air passage 8 in the side wall of the chamber 9. rlhis vertical air passage communicates with the interior of the chamber through the port 10 and the interior of the chamber communicates with the atmosphere through the port 11 located in its side wall diametrically oppositethe vertical air passage 8. 12 is a gravity actuated tapering valve having the restricted axial passage 13 therethrough for placing the interior ot the chamber 9 into` restricted communication with the port 11 at all times. However, as the lsuction eiiect within the chamber 9 increases, the valve 12 raises to permit ot an increasing iiow of air into the chamber. 1li Vis they liquid fuel. tube extending upwardly within the'air tube 6 and spaced trom its wall to permit of the' passage olf the auxiliary air.. 'lhe upper end ot this liquid fuel tube terminates within the auxiliary tube and its lower end communicates lwith the chamber 9 through the lateral fuel passage 15 the carburetor body. The auxiliary air tube 6 is 'provided with the longitudinally spaced ports 16 for placing its interior in communication with the outlet 1, the upper port-being at all times in communication with the outlet.

17 is a vertically reciprocable plunger within the cylinder 18 formed in the carburetor body. this plunger variably restricting the communication between the primary air inlet. and the outlet and its position being determined by the pressure within the outlet in rear of the throttle valve. The vertical position of the most position of the plunger is determined by means of the coil spring 20 surrounding the guide rod 21 which extends into the plunger. 22 is a metering pin secured to the plunger and cooperating with the liquid fuel tube 14,- to variably restrict the flow of the liquid fuel therethrough into the emulsifying chamber formed by the air tube 6. The air tube is also secured to the plunger, the arrangement being such that as the plunger rises, the primary air passing through the air inlet 2 into the outlet 1 increases, the liquid fuel passing through the liquid fuel tube 14 increases, and the mixture of this liquid fuel and the auxiliary air passing through the air tube 6 and entering the outlet 1 increases.

The vertical position of the liquid 'uel tube 14 relative to the metering pin 22 is manually adjustable through the lever 23 engaging the lower end of the liquid fuel tube and mounted upon the rock shaft 24to which is connected the lever 25 operable from the dash of the motor vehicle by the exible connection 26. A coil spring 27 yieldably holds the liquid tuel tube in its uppermost position.

As shown in the present instance, liquid tuel is drawn into the carburetor from the supply tank 28 by the suction producinfr means oit. the. carburetor such as an interna combustion engine, and the chamber 9 forms plunger is dependent upon the difference in the pressures below and part of the discharge connection between the tank and the cerburetor. The suction for drawing the liquid fuel from the tank is secured through the port l@ connecting the interior of Ithe chamber 9 neer its upper end with the vertical air passage 8 in the side Wall of the chamber which in turn connects into the lateral air passage 7 leading to the air tube 6. To prevent siphoning of the liquidy fuel when the motor vehicle is doing down hill, I have provided the oat 29 in the chamber 9 to which is secured' the valve 30` for closing the port 31 into the chamber. The liquid Vfuel entering' the chamber 9 may discharge through'the liquid fuel tube 14 owing tothe differential pressures at the surface of the liquid fuel -if for any reason, eiphoning of the liquid neeeeel fuel should cccur'so that it enters the. chember'faster than it discharges, the doet with in the chamber actuates the (valve to close the same end prevent further eiphoning.,`

What l claim as my invention is:

In a carburetor, the combination with the body having an airy inlet und en outlet, of

a cylinder, a plungernslidablewithin said cylinder for controlling the communication of said air inlet with said outlet, an .air tube depending from said plunger and adapted trol the iow of liquid fuel therethrough, t and means for placing the interior of seid,

cylinder in communication 'with sei-d outlet.. In testimony whereof ll ,etlix my eigneturea WLLVIAM GREKSCHEEL

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