US1567918A

US1567918A - Carburetor

Info

Publication number: US1567918A
Application number: US13231A
Authority: US
Inventors: Cox Arthur
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-03-05
Filing date: 1925-03-05
Publication date: 1925-12-29
Anticipated expiration: 1942-12-29

Description

A. COX

CARBURETOR 2 Sheets-Sheet 2 Filed March 5,; 1925 Patented Dec. 29, 1925.

i UNITED STATES ARTHUR COX, F IOLTON, NEAR BIRMINGHAM, ENGLAND.

'oAnBUnnron Application mea March 5, 1925-. serial No. 13,231.

. To all whom it may concer/fz: l

` Be it known that I, .ARTHUR COX, subject of the King of Great Britain, residing at Harlech, farwick Road, Olten, near Birmingham, England, have invented a` certain new anduseful Carburetor, of which the followingis a specification.

My invention has reference to carburetors of the kind described in the specification of myy United States Letters Patent dated the 31st day of August 1920 No. 1,351,624,v

wherein a: nozzle discharges into a branch passage which conveys the fuel and the primary air into'a main air-passage, and the fuel-delivery from the said nozzle is varied vby .regulating an admission oit air into the said branch by mea-ns of a rotary valve v located between the nozzle and the main passage and operated byor from the throttle valve.`

The object of my said invention is to provide for the embodiment in a barrel-throttle carburetor of the above-'mentionedtype, of an idling nozzle for supplying mixture to the engine when the throttle-valve is closed.

To realizey this, I propose, according to my present invention, to'utilizethe nozzle lthat discharges into the primary air-branch as the main or normal-running nozzle, and to provide an idling nozzle for delivering fuel or mixture into the main passage on the engine side of the throttle valve when the main nozzle ,is out of action. Also I apply to or detachably mount upon the 'fixed member or casing of the valve that controls the main nozzle discharge, a nozzle-housing in "which both the main nozzle and the idling nozzle are fitted, whilst I also use in Vcombination with such a nozzle system, a fuel 'or mixture reception passage which is formed in the throttle chamber in concentric relation to the throttle axis and has communication, `on the one hand, with the idling nozzle by a conduit passage located outside the throttle-operated valve that' controls :he

` main nozzle, and on the other hand, with the present invention and taken on line 1-1 ofFigure 2. i y f v Figure 2 is an elevation of that side of the carburetor on which the nozzle and the primary air-intake are located.

Figure 3 is a plan, partly inhorizontal section on line 3-3 of Figure 4.

Figure 4t is an elevation of the carburetor looking from the right-hand side of' Figure 2 and showing the engine side ofthe throttlevalve; this valve being in its closed position.

Figure 5 is a sectional elevation showing the fuel-connections between the idling nozzle and the engine side of the throttlegthe throttle being shown slightly opened.

Figure 6 is a vert-ical section on line 6-6 of Figure 5.

Figure 7 is a vertical section on line 7 7 of Figure 3.

Figure 8 is an enlarged sectional detail of the idling nozzle.

Figure 9 is an elevation of the throttlebarrel separately.

The same letters` of reference indicate correspondingpartsin the several figures.

' In the construction illustrated, the part a (hereinafter referredto` as the nozzle body) that housesj the' nozzles is vdetachably secured by screws or the like to a iiange or seating a on the outer end `of the lixed ported sleeve e2 that surrounds the primary kair branch c and contains the ported member c of the valve which controlsthe fuel delivery of the nozzle b (hereinafter referredto as the main nozzle), and rotates with the throttle-valve. Both the main and the idling nozzles b, d are removably mounted `in chambers in the nozzle body, and the idling nozzle takes its fuel from a supply passage e? connected with the iioat chamber (notshown) of the'device. The idling nozzle comprises a detachable and interchangeable nipple formed at the inner end of a screw threaded and axially-bored plug d2; the interior of said nipple having communication both with the idling fuel-passage d3 and with an air-intake hole d* which is drilled in a cap d5 that is normally applied to the `outer end of the plug. This nipple is also drilled with radial outlet passages d communicating with an annular clearance d that is provided between the nipple and its chamber d, and with which an external conduit e of relatively small bore connects, the conduit e extending to the throttle-chamber of the carburetor, where it communicates withv a reception channel, groove or passage that is formed between an end of the throttle-barrel, and the corresponding end of the throttle-cham ber, in concentric relation to the throt-tleaxis. For instance, as in the illustrated construction, that end of the throttle-barrel f nearest t-he nozzle body is formed with an annular step f of smaller diameter than the tln'ottle-chamber so as to provide an annular passage or reception chamber g into which the tube e leads so that this reception chamber is in communication with the externally-located idling nozzle in all positions of the throttle.

From the reception chamber fg, a hole h is l drilled into the throttle barrel, parallel with the axis ofthe latter, and from this hole one or more small ports lead out onto the periphery of the barrel on the engine side ot the throttle.

In the device shown in the drawings, two such ports t, 71,2 are provided, and these are so arranged that when the throttle is closed `(see Figure 4) only the one port 7L is uncovered and in communication with the induction passage on the engine side of the throttle barrel and it is from this port 7L that Jruel is then induced :trom the idling nozzle by the depression set up by engine suction in the .induction passage between the closed throttle and the engine. As regards the second port h2, this is uncovered or brought into communication with the induction passage (as shown in Figure by the initialmoveinent of the throttle barrel from the full-closed position and its effect is to maintain ,the fuel supply from the idling nozzle during .such initial throttle opening and to prevent` the cutting out of the idling nozzle before the main nozzle is in effective operation. That is to say, when, with, the engine idling, the throttle is slightly opened from the fully-closed position, the consequent Iopening of connnunication between the atmosphere and the induction passage brings about a `drop in the depression produced by engine suction within the said passage, but since both ports 7L', h2 are uncovi cred bythe throttle movement, this reduced depression is etl'ective upon a port area double lthat which obtains when the throttle is closed, and by the action of the reduced depressionl on the doubled port area effective suction on the idling lnozzle is maintained until the throttle is so far opened as to bring the main nozzle into action. Irregular engine running during the change over from the 'idling to the main nozzle is thus obviated.

Having described my invention, what I claim and desire to secure by Letters Patent is l. A carburetor having a main body provvided with a throttle chamber, a barrel type throttle rotatably iitted in said chamber, a primary air tube discharging into said throttle, a housing fixed on 'said tube, a main nozzle in said housing discharging into said tube, means `for controlling the operation ot the main nozzle including a rotary valve carried by the throttle, an idling nozzle in the housing, said throttle having an idling mixture discharge port and also having a passage leading to said port, an idling mixture reception chamber concentric with the axis ot.' the throttle and located between the end ot the throttle and the throttle housing, said reception chamber communicating with said passage in the throttle, and a separate conduit having a small bore and extending between the idling nozzle and the reception chamber. I

2. A carburetorhaving a main body provided with a throttle chamber, a barrel type throttle rotatably fitted in said chamber, a primary air tube discharging into said throttle, a housing lixed on said tube, a main nozzle in said housing discharging into said tube, means for controlling the opy eration of the main nozzle including a rotary valve carried by the throttle, an idling nozzle in the housing, said throttle having a plurality `of idling mixture-discharge ports in its periphery, lone of said idling mixture discharge ports being open to the engine side of the throttle when the throttle is closed and both of said idling mixture dischargeA AIn testimony whereof he hereunto atfixes his signature.

ARTHUR COX.

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