US1472615A

US1472615A - Carburetor

Info

Publication number: US1472615A
Application number: US211029A
Authority: US
Inventors: Pierce Burt Neulon
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-02-18
Filing date: 1918-01-09
Publication date: 1923-10-30
Anticipated expiration: 1940-10-30

Description

@a. 30' 1923. mvzmg B. N. PIERCE cARBUREToR Original Filed Feb. 18, 1915 w 2 sheetssheet 1 preferably,

i stants d @ct. 3Q), 1923.

lhlmttlld @F FMCE,

STATES BURT NEULON PIERCE, F BOSTON, MASSACHUSETTS.

CARBUBETOB.

ori ami application filedFebruary 1a, 1915, Serial at. 9,029. nirvana andthis application filed Janm ery 9, 191a. Serial No. ainoaa.

To all whom it may concern: I

Be it known that l, BURT Neuron Prunes, a citizen of the United States, residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Carburetors, of which the following is a specification, referones being had therein to the accompanying drawing.

This invention comprises a division of my application for carburetors, Serial-No. 9,029, filed February 18,

l915,'the'object being to provide novel means for heating the charge whereby the fuel is heated in the main jet and the mixture in the throttle chamber.

Another object of my invention is to provide a carburetor in which the throttle chamber is surrounded by a heating chambar to which is delivered a heating medium from which the same isconveyed to an auxiliary heating chamber surrounding the main nozzle in order to heat the fuel and air before it is delivered to the mixing chamber.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel, features thereof defined by the appended claims.

In the drawings, a

Figure 1 is a front elevation of my improved construction of carburetor;

Figure 2 is a rear elevation;

Figure 3 is a bottom plan view; Figure 4: is a vertical longitudinal section Figure 5 is a horizontal section; and Figure 6 is a vertical transverse section. lite erence being had to the accompanying drawings, in which like characters of reference designate corresponding parts on the several vlews thereof, the carburetor comprises a casing forme d -with a central vertically disposed bore to provide a mixing chamber 16 which terminates at its upper end with a reduced bore to provide an outlet 17 which is siirrounded with a jacket 18, preferably formed integral with the casing, to provide an annular passage orpocket 19 for the reception of a suitable heating medium to be admitted thereto through the connection 20, which heating medium is, the hotexhaust gases from the engine. After flowing through the pocket 19, the heating medium passes to an outlet 21 and thence through a discharge tube 22,

disposed vertically of the casing and discharging downwardly, to atmosphere. A suitable plug 23 is threaded into an opening formed in the jacket 18, at a point-diametrically opposite the connection 20, to permit access to the pocket 19 for the purpose of clearing the same of such foreign matter as may collect therein. A pair of threaded openings 2%, disposed at opposite sides of' the outlet 17, are provided so that the carburetor may be coupled to the adjacent end of the usual connection (not shown) leading um from passing throu h or into the pocket 19, or, in other words, t e amount or volume of the heating medium admitted to the pocket 19 varies inversely with the volume of the gas it is desired to pass through the outlet. The valve 25, of the outlet 17, is mounted on a shaft 29 which has its opposite ends projecting through the casing 15 to support, at one end, a stop 30 adapted to contact alug 31 when the valve 25 is in full open position, while the other one carries the lever 28. aforesaid, which is formed to provide the oppositely disposed stops 32 and 33 adapted tocontact a lug 34l,'formed on the casing 15, as is also, the lug 31, aforementioned, when the valve 25 is in either its full open or closed position.

Diametrically opposite the lower portion of the casing 15, and ofiset therefrom, are 'formed a float chamber 35 and an air inlet 36, the former ha ing an open top adapted to receive a cover 37 secured thereon by means of the several screws 38, and is shaped, at its outer end, to provide arestricted portion 39 in the bottom of which is threaded a gasoline, or other liquid fuel, inlet connection 40 formed at its inner end to provide a needle valve seat 41. Formed in the opposite walls of the restricted portion 39, immediately adjacent its juncture with the float chamber 35, are the bearings ,42 in which is supported or threaded a pintle 43 u on which is carried a lever 4 1 upon one on; of which is secured a float 45 and upon the other of its ends is secured a depending needle 46 adapted to have its lower end moved into and out of engagement with the valve seat 41 of the inlet connection 40 when the float 45 is raised or lowered by a corresponding rise or fall. of the liquid fuel in- The air inlet 36 is provided with a disc.

valve 52 formed with a slight cut-away portion-'53 to permit the passage of a small quantity of air to the mixing chamber 16 when the valve'is in its closed position, and is carried by a shaft 54 having one of its ends projected through the wall of the inlet to support an actuating lever 55., A.coi led spring 56 is interposed between the lever 55 and the wall of the inlet and arranged in a manner suitable for maintainin the valve in normally open position, whic is determined by a stop 57, formed with the casing 15, being engaged by the said actuating lever. 1

For the purpose of introducing the liquid fuel into that part of the centrally disposed bore of the casing 15, hereinbefore designated as the mixing chamber 16, a removable head 58 is adapted to be inserted into.

the bore to the rear of the aforesaid mixing chamber 16 and is clamped in proper position by means of the screws 59 threaded into openings formed in the shoulders 60 of the casing. A threaded opening 61 is provided in the bottom wall of the float chamber 35 to receive the'threaded end of a strainer plug 62, after the latter has been passed through an opening formed in a depending portion 63 of the head '58, the strainer plug 62, when in engagement with the threaded opening 61, acts as a further securing means for clamping the head 58 inposition with respect to the casing. The plug 62 is provided with a longitudinal passage 64, extending for a portion of the length thereof, and a transverse passage 65 in communication withthe passage 64 and having its opposite ends opening through the bottom wall of a circular groove 66 formed on the circumference of the plug 62, the open end of the passage 64; being covered with a strainer 67 of fine mesh wire screen, or other suitable material. Thehead 58 is provided with a centrally disposed passage 68 which establishes communication between the circular groove 66 of the plug 62, the main or low speed nozzle' 69, and the auxiliary or high speed nozzle 70, the said main injector nozzle 69 being arranged to discharge the main supply of liquid fuel to one side of the mixing chamber 16 while the auxiliary injector nozzle 70 is arranged to discharge a suitable amount of the liquid fuel to the other side of the mixing chamber 16, as and for the purpose to be hereinafter set forth. Projecting from the inner face of the head 58 is a semi-cylindrical body 71 having a curved cut-away portion 72, the purpose of which will be hereinafter fully explained. An opening 73 is provided in the fiat face 74, of the body 71, to permit passage therethrough of a current of air to and through a circular space 75, surrounding the main,

nozzle 69, to the mixing chamber. p

Intermediate the ends of the main injector nozzle 69 is formed a valve seat 76 adapted to receive the adjacent end of a needle stem 77 which is adjustably threaded in a nipple 78 projecting outwardly from the outer face of the head 58. .The nipple 78 is exteriorly threaded to receive a cap-nut 79, surround ing the needle stem 77, adapted to retain and compress a packing, ring 80 tightly around the needle stem 77 to prevent possible leakage of the liquid-fuel therefrom.

The head 58.i s provided with a second offset portion 81 which is provided with an enlarged bore 82 to receive theadjacent end of the discharge tube 22, aforementioned, a closure 83, pivoted at 84, being provided to regulate the exit of the heating medium through the bore 82 to atmosphere. A small opening 85, however, may be formed in the cover or closure 83 to prevent the absolute closing of the bore against the passage of the heating medium therethrough.

To initially heat the liquid fuel passed through the nozzles 69 and 70, a duct 86 connects the bore 82 with a circular passage or dpocket 87 formed in the semi-cylindrical b0 y 71, which surrounds the main injector nozzle 69, and the heating medium, after passing through the ocket 87, is discharged therefrom through t e opening 88"formed in the outer wall of the head.

Extending diametrically across the mixing chamber 16 is a valve-shaft 89, supported at its opposite ends in suitable bear- 1 ings 90 and 91, and provided intermediate its ends with a slot 92 in which is supported an air proportioning, flap-valve 93, which may be held in any desired adjusted position therein, with respect to the curved cutaway portion 72, of the semi-cylindrical body 71, of the head 58, by means of the screws 94, the said flap-valve 93 being adapted for proportioning the amount of air to be admixed with the liquid fuel within the mixing chamber.

One end of the valve-shaft 89 outwardly beyondthe'bearing 91 and is provided with an arm. having a valve "controlling mechanism connected thereto, as shown in my application, Serial #9929.

By coupling the engine exhaust (not shown) in any suitable manner to the connection 20, an efiicient heating of the mixture as .it passes to the manifold of the engine, is obtained, and, as has been hereinbefore explained, a valve 26 is provided, in the connection 20, for regulating the amount of hot gases, from the exhaust, or, other heating medium which may be employed for the purpose in lieu of such exhaust gases, in suitable proportions to properly condition the fuel or as before the same is passed to the manifol 1' claim:

- 1. A carbureter for an internal combustion engine comprising a casing having a mixing chamber provided with an outlet having a heating jacket surrounding the same, a member arranged in said casing having an air passage for delivering air to said mixing chamber, said member having a heatin jacket surrounding the air passage thereof, a fuel nozzle extending into said air passage, means for conveying the heat-- ing medium from the first mentioned heating jacket t'othe second mentioned heat jacket and means for regulating the volume of heating medium passing intothe last mentioned jacket.

2. A carburetor for an internal-combustion engine comprising acasing having a said mixing chamber, a nozzle arranged in i said passage, a jacket surrounding said air passage having an inlet and an outlet, a pipe connecting the outlet with the first mentioned jacket to the inlet of the second mentioned jacket and a movable apertured member arranged over the outlet of the last mentioned jacket.

3. A carbureter for an internal combus tion engine comprising a casing having a mixing chamber having an outlet surrounded b a heat jacket, means for conveying a heating fluid to said heat jacket, a member mounted in said casing having a normally open air passage communicating with the mixing chamber, a fuelnozzle extending into said air passage, a heat jacket surrounding said air passage provided with an inlet and an outlet, and means for conveying a portion ojilthe volume of the heating fluid to said set: Ind mentioned heat jacket or discharging the same in the atmosphere. I

In testiniiony whereof I hereunto affix my signature the presence of two witnesses.

BURT NEULON PIERCE.

Witnesses:

CHARLES M. DOWNES, FRANK J. MGHUGH.