US1563705A - Carburetor - Google Patents

Description

Deu. 1 1925,

J. c. HANSEN-ELLEHAMMER GARBURETOR Filed NOV. 30 1925 2f /7 is 22 Pmnted Dee'. 1, 192s.

UNITED STATES PATENT OFFICE.

Y CABBURETOR.

Application tiled Npvember 30, 1923. Serial No. 677,913.

To all, whom it may concern:

Be it known that? I, JACOB CHRISTIAN HANSEN-ELLEHAMMER, subject of the King of Denmark, residing at Copenhagen, Denmark, have invented certain new and usefnl Improvements in Carburetors, of which 4the following is a specication.

The present invention relates .to carburetors. g

The present carburetor is essentially characterized by a cylindrical block or plug, which rotates with the air inlet valve of the carburetor and which has a fuel passage, the inlet .area of which increases gradually, as the depression in the carburetor increases, so that the proper ratio of mixture between fuel and air is permanently maintained.

In the accompanying drawing Fig. 1 is an axial section through a constructional form of the improved carburetor With its parts in such positions that the fuel can enter.

Fig. 2 is a similar section with the parts in such positions that the fuel supply is interrupted. l

Fig. 3 is a cross section through the said cylindrical block, and v A Fi 4 is an end view of a slotted. spindle whic is employed.

Referring more particularly to the drawing, 1 indicates the cylindrical body or casing of the carburetor, which is open at one end for admission of air and is adapted to be connected at its other endwith the induction pipe of the engine. A butterfly or other suitable throttle valve 2 is rotatably mounted in the central portion vof the casing, and `is secured to aspindle 4 equipped with an external operatin handle or lever 3; the portionl 16 of the c sing in advance of the throttle constituting a` mixing cham.- ber, as subsequently explained.

Above the throttle, the casing has formed on its u per side an enlargement or boss 5 provide with an axial vertical bore 7 and with an internally-threaded socket 6 to receive the end of the fuel pipe (not shown), the socket and bore connected b a shorthorizontal duct 8. e upper en of spindle 4 projects into the bore 7, Vwhich thus forms one bearing for said spindle, the lower end thereof bein journaled in a secon bearing opening ormed through the under side of the casing. An upstanding annular flange 20 is provided upon the top of the boss 5 concentric with bore 7 and defines a cylindrical space or chamber 21 1nto the centerof which said bore 7 opens.

The top of spindle 4'terminates an appreciable distance below the bottom -of said chamber, leaving a space wherein a ,cylindrical block of plug 11 is slidably and ro tatably fitted; this block being integrally or otherwise rigidly secured to a depending axial stem 17 provided upon ahead or cap 18 which overlies flange 20 and is itself provided withan annular marginal flange 19 that extends downwardly across the outer'y face of ange 20. An expansible coil spring 22 is disposed in chamber 21, where it encircles stem 17 and exerts its'pressure upwards against the under face of the head -or cap 18, with the result that the latter and,

hence, the slide block 11 connected to its stem 17 will be raised. To limit this move-4 ment, 'a stop 23, in the form of an L-shaped -member, may be used; the short vertical arm of said member beingsecured in the top of boss 5, while its-longarm extends horizontally above and across the cap, as

shown.

It is proposed to utilize the slide block 11 in `controlling the flow of the liquid fuel from the duct 8 to the carbureting chamber 16, and it is also proposed to regulate such flow in accordance with the movements of the throttle. To effect these objects, the block has a specially-shaped groove 12 formedin its periphery wall, and a loose coupling is provided between the block and the spindle 4. The groove 12 is connected at its inner end, by means of'a short'radial passage 13 (Fig. 3), with a vertical passage or bore 14 which is formed axially through the lower part of the block and is adaptedtoregister with the end of a paage 15 in the upper part of the spindle; the lower part of this passage 15 opening at a downwardly-inclined angle through the side wall y of the spindle so as to discharge the fuel into the carbureting chamber 16 in advance of the throttle.

The groove 12 above referred to, increases progressively both in width and in depth from its outer end, whereit is as ne as a needle, to its inner end where it opens into the radial passage 13; so that', according as one part or another of the groove is brought opposite the inner end of duct 8,

the supply of fuel owin'g from the latter into the ductv will correspondingly increase or decrease. `But it is to be observed, however, that in the normalvposition of parts,

chamber 21, where it acts to pull the capl downward, said cap returning to its raised position as soon as the suction decreases to.

a point where it canlno longer overcome the pressure of spring 22.

As the suction-action is controlled by the throttle 2, the connection between the spindle 4. thereof and the block is of such a nature as to. be maintained throughout the sliding movements of the block, so thatf the two elements will always move as a unit irrespective ofthe position which said block happens to be occupying. A loose tenon joint is preferably utilized, one member being formed wit-h a tenon 10, and the other with a slot or groove. 9 wherein the tenon slidably lits; lthe depth of the parts 910 being such that the one is never entirely withdrawn from the other but remains sufficiently engaged therewith to insure rotation of thetwo members in unison. The construction here represented shows the slot 9 as formed in the top of the spindle il, while the tenon 10 `is formed on the under sideof the sliding block 11 though such arrangement may be reverse if desired.

The hereinbefore described 'carburetor operates in the following manner: As long as the engine is running, the suction which, through the duct 24 reaches the chamber 21, will hold the cap 18, acting as a pneumatic valve and guided by the flanges 19 and v20, against the last-named flange. The cylindrical block 11 is then in its lowermost position, Fig. 1, in'which the groove 12 registers with the axis of the passage 8. According to-'the more or less open position into which the throttle 2 has been set by the spindle et,A a narrower and less deep or a wider and deeper part of the groove12 will register with the in- 'ner endof duct 8 so that, in consequence thereof, a more or less'large admission opening for fuel is allowed, and the change from the one to another size of such admission opening proceeds evenly and gradually.

As the fuel supply leads to the mixing chamber 16, which is situated between the air valve and the engine, the vacuum for the suction of fuel will be the higher the more the throttle is closed, the highest vacuum and the maximum atomization of the fuel thus being obtained when the engine is rumiing idly.

At the moment when the engine stops, the spring 22 will-force the cap 18 upwards, until the latter is stopped by abutting against the stop 23, whereb'y the block 11 is lifted to the position shown in Fig. 2,

so that the groove 12 willflie higher: up

than the duct 8, and the latter is'thereby closed by the cylindrical surface Vof the block. Under the action. of the spring the block is held in this position until the suction created by the engine commences again and forces the cap- 18, and with it the block downwards into the position shown in Fig. 1.

From the foregoing it is evident that the cap 18 will be lturned when the throttle valve "2 and the cylindrical block 11, are turned, and the frictional resistance between the said cap and its flange 19 and the flange 20 will have the effect that the parts will, when once'set, maintain their -position until they are set afresh.

AThe details shown and described in the foregoing specification and the drawing may be varied Vin many ways without de? parting'from theprinciple of the invention as claimed. Y

I claim:

1. In a carburetor,a casing formingamxing chamber and having a transverse bore; a fuel inlet opening through the periphery of said bore; a throttle valve having a spindle rotating in said bore, said spindle having a fuel passage therein; a cylindrical block rotating and reciprocating in said bore and having an opening to cooperate with said fuel inlet and a passage for fuel leading from said opening and communicating with the fuel passage in the throttle spindle; means for movably holding said block with said opening out of register with said fuel inlet; means responsive to the suction in the mixing chamber for reciprocating said block to cause said opening and inlet to register; and means connecting ysaidblock and throttle spindle to rotate the block with the throttle but permit said reciprocating movement.

2. In a carburetor, a casing forming a mixing chamber and having a transverse bore; a fuel inlet opening through the periphery of said bore; a throttle valve having a spindle rotating in said bore, said spindle having a fuel passage therein; a cylindrical block rotating and reciprocating in said bore and having a taperinggroove to cooperate with said fuel inlet and al passage for fuel leading from said groove and communicating w1th the fuel passage in the throttle spindle; means for "niovably holding said block with said groove out of register with said fuel inlet; means responsive to the suction in the mixing chamber for reciprocating said block to cause said groove andy inlet to register; and means connecting said block and throttle spindle to rotate the block with the throttle but perinit said reciprocating movement.

3. In a carburetor, the ooi'nbination, with a casing forming a mixing chamber and provided with an annular boss having an axial bore and with a fuel inlet opening into said bore7 of a throttle valve having a spindle rotating in said bore, a depressible controller in said bore having a. passage for delivering the fuel to said chamber which registers with said inlet when the controller f is depressed; said casing having a passage which opens into the interior of said boss; a cap slldably fitted on said boss and subjected to the suction action transmitted through said passage to be depressed thereby, said cap having the controller rigidly connected to it; a spring Within said boss acting against said cap to normally hold the same and the controller in raised position with the passage in the controller ont of register with the fuel inlet: and means connecting said controller and spindle to rotate the former in unison with the throttle valve when said valve is turned, while permitting movement of the controller independently of and relatively to said spindle.

4. In a carburetor, the combination, with a casing forming a mixing chamber and provided with an annular boss having an axial bore and with a fuel inlet opening into said bore, of a throttle'valve having a spindlerotatng in said bore, a cylindrleal block rotating and reciprocating in said bore and having a. passage for delivering the fuel to said chamber which registers with said inlet vwhen the block is depressed; said casing having a passage which opens into the interior of said boss; a cap slidably fitted on said boss and subjected to the suction action transmitted through said passage to be de pressed thereby, said cap having the block rigidly connected to it, a springwithin said boss acting against said cap to normally hold the same and the block in raised position with the passage in the block out o register with said inlet, and means connect ing said block and throttle spindle to rotate the block with the throttlebut permit said reciprocating movement.

In testimony whereof I aix my signature.

JACOB CHRISTIAN HANSEN-ELLEHAMMER.

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