US1676932A - Carbureting device - Google Patents

Description

Patented July 19, 1928.

* artsv STATES r; orrica; 1

HERBERT WILLIAM sPILLEn, OF LONDON, ENGLAND, AssIeNoN mos. smrrnsc soNs (MOTOR ACCESSORIES) LIMITED, or LoNDoN, ENGLAND, A BRITISH COMPANY;

GARBURETING DEVICE.

Application filed January 4, 1927, Serial No. 158,985,":11111 ill. Great Britain January 22, 1926. i

I This'invention is for in'iprovei'nents in or relating to carburetlng devices and has for one of its objects to'facilitate the manufac-v turethereof, and for another object to increase the working efficiency. The invention 18 an improvement In or modification of the,

invention described and claimed in my United States Patent No. 1,567,088, and like the carbureting device described in that fication embodies a duct block having a plurality of ducts for carbureted air each extending, separately from the others, from' its intake aperture at one end" of the block to its delivery mouth at a restricted portion p p I the invention there willnow be described, byway of example onlyand withreference 75 of the lateral surface thereof, which portion is, intended to face directly the intake end of the main delivery conduit, say the induction pipe" of an internal-combustion engine. The delivery mouths of the ductsare situ-i ated at different positions along the'length of the block and a sleeve valve movably received upon the lateral face of the block is automatically operated 'by'variations in the pressure in the main delivery conduit to' .move along the block and successlvely cover and uncover the said delivery mouths.

In my co-pendingUnited States applioa tion No. 6,916, filed 5th February, 1925,

thereis'described an improved or modified construction in which each of the said ducts substantially extends in a straight or straight path without sharp twists or bends from its intake aperture to its. delivery mouth. I

According to the primary feature of the present invention there is provided a carbureting device which embodies the advantages described in the aforesaid specification and which is characterized in that the duct block, upon the lateral surface of which the sleeve valve is movably received, has extending into its interior a cavity constituting an air intake which is common, and large relatively, to the ducts. The carbureting device according to the invention is further characterized in that the ducts are short (and preferably straight) and lead from the.

ing ofthe block is facilitated and since'the carbureted air only has to pass through short ducts the frictionalfresistance to its travel is but small and consequently'the carburetor is capable of Working efliciently, even 5 though the carbureted air is being drawn throughit at'a high'rate in order to satisfy large demands by the engine. Y

A convenient construction according to thep resent invention comprises a duct block of general cylindrical formation which has the aforesaid air intake cavity reaching end-f wise into it and has the ducts extending from such cavity to the lateral curvedlsurface of the block. The fuel supply conduits i may reach transversely into the ducts between their ends. I H

For a more complete understandlng of to the accompanying drawings, one constructional form of carburetor-according to' the invention. It is to be understood,.l1ow-, ever,"that tl'ie invention is'not restrictedto the precise constructional details set forth. 0A,

l her isiinclicatedat"10, acylindricalduct:

blockat 11, ajca'sing' enclosing thejlatter.

at 12, the int ake end of an internal-3 combustion engine induction pipeat" 13. This 'pipe is controlled'in the usual way by a throttle valve whereof the spindle is illustra-ted at 14. The duct block 11 has an enlargement 15 by which it is carried by the 0 casing 12 and there is attachedto an ex tension 16, reaching downwardly from the duct block, a portion 17 of the casing of the float chamber Mounted to slide automatically up and down on the cylindrical Surface- 7105 of the duct block is a valve 18. The con struction of duct block shown has four ducts I 19, 20, 21 and 22 respectively which all lead to a restricted portion of the lateral surface ofthe duct block 11, namely the surface im- 11a mediately opposite to the induction pipe 13.

Inits upward movementthe valve 18 will first commence to uncover the duct 19, then commence.- touncover the duct 20, then commencez'to uncover the duct 21 and finally commence to uncover the duct 22, the ar- Reaching half-way into the ducts 19, 20,

21 are vertical. diffuser tubes 23 whichat their, lowerends are arranged to surround nozzles 24 leading from the float chamber; The lower ends of the tubes 23 surround the nozzles 24 in such 'a way as to leave an annular space25 for air. to be drawn in be,

tween'the nozzle and tube so that-the fuel.

' isdelivered into the duct'i'n the form of a mist. The pure air duct 22 will be found useful in some circumstances in promoting @the efficiency of the carburetor but it is not essentialto employ this duct.

Extending upwardly into the duct block 111 is the main air intakecavity 26. The

cavity 26, as illustrated, occupies about half the. cross-sectional area of the duct block and. reaches from the lower end thereof'to the level. of the upper surface of the; duct 22.- The'ducts 19, 20, 21 and 22 can bef brought very close together, but su'flicient,

metal can easily be left between them to permit the ducts to belformedby casting.

The general direction of' the ducts is substantially that of the adjacent part 'of the induction pipe 13. ,The cavity 26 is quite large and permits ample supplies of airto reach the intake ends of the ducts and it will beappreciate'd that there need hey no sharp bends or twists to impede the travel of the carbureted air; I v

I, claims-e 1 1'. In, a carbureting device, the combination of a suction chamber having a delivery passage one side thereof, a duct block in. the chamber, a-cavity extending into the duct v block, of relatively large cross 'sectional area and constituting an air intake, av plurality of separate short straight. ducts each of relatively small cross-sectional area, each extending through said duct-block;

from the cavity to the suction chamber in alignment with. the sald delivery passage therefrom andv a suction-operated. valve movable on the ductblock to cover and un-] coverthe delivery mouths successively. 2. In a carburetingdevice the combina- 'tion of a suction chamber having a delivery outlet at one side thereof, a duct-block in said chamber, a plurality of short and substantially straight ducts in the block extendingfeach separately from the othersfrom a cavity extending into the interiorvof the block and constituting an air intake which is common to all the ducts and with which i the intake apertures of the ducts communicate, to a delivery mouth openmg 1n a restricted portion of the lateral surface of the block and a suction-operated valve-movable on the block to cover and uncover the said delivery mouths successively.

3. In a carbureting device the combination of asubs'tantially cylindrical suction chamber, whereof one end is closed and an other. end is open, having'a restricted de livery out-let at. one side thereof, a cylindri:

cal duct-block extending into the chamber through its open end, a plurality of short and substantially straight ducts in the block extending each separately from the others from a cavityclosed atone end and extend ing end'wise'into the block constituting an air intake which 1s common to all the ducts and, with which the intake apertures of theducts communicate, to a delivery mouth situ-; atedopposite the restricted delivery outlet of the suction chamber, an upstanding guiding member located upon the duct-block, a.

suction-operated sleeve-valve movableon the cluct block and gulded by said guiding mem-, her to cover and uncover successively the deliverymouths of said ducts,vdiffuser tubes one for each duct extending each vertically into the respective duct transversely ofthe axis of the. duct and fuel supply means common to all of said diffuser tubes and includ ing a: constant level fuel chamber.

In testimony whereof I affixmy signature,

HERBERT WILLIAM SPILLER',

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