US1574772A - Fuel-feed pump for internal-combustion engines - Google Patents

Description

March 2 1926.

R. WALKER FUEL FEED PUMP FOR INTERNAL COMBUSTIONNGINES Filed Jan. 2.5. 1924 m Ezgi a a? 2 ?V Patented Mar. 2, 1926.

'PATENT o'FF c E r RUDOLF WAIKER, VIENNA, AUSTRIA.

FUEI-FEED PUMP FOR INTERNAI-COMBUSTION ENGINES.

Application filed. January 25, 1924. Serial No; &88,526.

To all 'whom 'it may conccm: i

Be it known that I, RUDOLF WALKER, a subject of the Kingdom of Great Britain, residing at XI Simmeringer Hauptstrasse 38-40, Vienna, Austria, have invented Improvements in Fuel-Feed Pumps for Internal-Combustion Engines, of which the follojwing is a specification.

Ina modification of the improved fuel pump according to the presentinvention the springless suction valve mounted on the piston ot' the fuel pump is opened 'and ,closed quickly by its inertia which acts at every reversal ot the stroke of the fast-moving piston, and is carried along by the pump pis-- ton in its open and closed conditions respectively. These movements of the valve may be accelerated by the use of hydraulic resistance. rendered accessible from a pump cylinder. i

A constructional example of the improved uel pump is illustrated in the accompanying drawings in which p i v Fgure 1 is a longitudinalsection, and

point outside the Figure 2 is a sectional view of a details of the improved pump.

1 is the pump cylinder; 2 is the pump piston; and 3 isthe suction valve mounted on the piston 2. The suction valve rod 9 eX- tends throughout the length of the suction duct 17 in the piston 2 down to a laterally accessible opening 14 formed in the piston,

where the rod 9 carries a preferably ad-` justable stop 11 for limiting the lift of the suction valve 3.

The suction valve 3 has complete freedom of movement within its stroke which is limi ited by the` stop 11, and it is opened and closed quickly and independently of the flow of the liquid through it, by the arrangement that on the reversal of the fast-moving v piston 2, the suction valve 3, owng to its own inertia, does not reverse its movement immediately but continues to move in the same direction as hitherto, so far as this is allowed by the stop 11. From that moment onwards the suction .valve is carred along by the piston in its respective condition of being open or closed.

The inertia of the suction valve and consequently the rapidity with which it opens and closes increases With the speed of the puinp and the weight of the suction yalve. Although the suction valve s necessarly of Further, the suction valve is small size, its Weight is brought up to the required amount by the provision of a long valve rod 9. i

This valverod also serves to afi'ord aci the pump oylpreferably adjustable, stop 11.' If the openin 1 1 n the piston issituated entirely outsi e the pump cylinder 1 no opening in the latter is necessary.

v Further, in the illustrated example the opening in the piston and in the cylinder is Situated within the fuel tank 13.

Through these openings it is possible to inspect, operate and test .the suction valve 3 by means of thevalve rod 9 and observeand regulate the lift of the suction valve. Moreover the stop 11 works in liquid fue'l, so that it providesthe suction valve with a hydraulic resistance, whichacts uponthe suction valve in the movement of the piston, whereby the. suction valve isi causedto open and. close' more quickly than would be the case without 'this hydraulic resistance.--

By mounting a plate 18 or the like device on the suction-valve rod9 (Fig. 2), this hydraulic resistance can be' increased with' the result that` the suction valve will open' and close still more quickly. u i 15 is a larger stage of the piston 2, which operates as a preliminary stage in an auxiliary pumping cylinder 16 and is acted upon 4 by a spring 8, that produces a quick upstroke of the piston 2, whilst the downstroke of ,the latter, is efi'ected by a cam (notshown). i v y The suction duet 17 is closed atitslower' end at 20; it communicates only by way of the ducts 19 with thev auxiliary pumping space 16 which communicates in its turn` withthe tank 13 through a separate suction: valve 21 (shown as a fiap valve). V

The operation of the large piston stage 15 (Fig. 1 is as follows :-During the upstroke of the piston, this stage 15 draws liquidfuel through 21 from the tank 13, and forces it, during the downstroke of the piston, through the ducts 19 into the suction duct 17 of the piston 2, and thence into the pumping space above the suction valve 3.

Owing to the closures at 20 and 21 the described Construction assuresa suotion and: compression of" the" auxiliaryl' pumpf 15', 16` without loss; and consequently .a complete filling of the suetion space of the improved fuel pump even at very high' speeds;

The auxiliary pump may also deliver en excess of liqud f'uel to tlie sueton valve 3 and in such a ease the-deliyery valv-e 4: can be prevented from opening by various means;

1. In a liq uid fuel pump for internal conibustion engmesg a prmp pistong asueti'o'n valve on seid-'pisten having' complete freedom of movement within its limited stroke-, said velve` being: of suchweight a's to be caused to open' and close quickly by the action-of its large' inertie' at eaeh reversl of the stroke of `'thefatst movin'g; pisten and being v erried alongyn- 'its` openendclosed positions respeetivelm e v x v 2. In a liqiid fue-l' punp for internal eon'ibustion'- engines, as* pup pisten, a suetion valve on said piston,-.- a seat' and a" stop' for` said vlvey said va lve beingof su'oh weight a's to be caused` to; open and close quickly by the action-of itsinettia a't each'- reversahofthe streh of the fastn'ovin'g pisten and being; carried along) in" its? open and' closed postions respective-ly: and a rool' oa rried by the vlve inerwsing it's Weight and nertia': r

bebe-used* to open and close quickly by the' action of its inertia; att' ea'ehrevets'al of the' stroke of' the r fest moving: pisten' and being earried along in it's open end closed positi'ons respeetvely, a ro'd 'cermied by 'a'd infcreasing the' wei-ght 'of the valveand extendbustion: engines a pump pisten; a suet'eri said valve being caused to open anel close quickly by the' action of its" inerti &tt each nd' elose'd positions r' adapted, When containing liquid fuel, to submergethe stop theren-Whereby to producea" hydrmlic resistizn ce' to the movement of the rod and VLlVG and thereby cause rapid opening and closngmovements of the latter' at the' 'ever'sl' 'of the Strokes of said pisten. i L u i 6. A fuel pump as claimed in claim 4 cheracterzed by the' provson of 1 container adapted, When containing liquid fuel to submerge the* stop` theren" Wherebyto produee :t hydraulie resstance to the movement of the rod an'd valve and there'by cause rapid' opening and elosing movements ot theulatter at the' reversa'ls' of the strokesof said pisten.

?Libfuel pump as claimed in claim 3 eharacterized by the p'ov-si'o'n of a containe' adapted; When eontttin'ng lio uid fuel, to submerge tlie stoptherein- Whereby toproduce a liydraulie resistanee to` the movement of the rod and valve' and thereby cause' rapid opening' and' closing movements' of the latter at the reversals of tlie'str'okes of said pisten', and m'eans'to 'increase the hyduulie resistanee above that a'l'orde'd by the stop.

A fuelpump as' claimed in claim' l charactei'zed by the provson of a, con tainer adapted When containing lquid' fuel, to subme'rge the stop theren whereby to produce a hydraulie resstance to the'movement of the' red and valve and-thereby cause i I v rapid opening' and cl'osing movements of 3z-II`1 a liqu id ,fuel ipuinp for internal 7 combustion' engiiies,':-2t pump pisten;- a; suo-' tioi' valve on saidgpistoh a seatfor sid valve, said valve bilg of such weight as' to the letter at the reverse-le' of the strokes ot seid-pisten; andmeansto increase theliydraulie resistano'e above' that afiorded by the stop. V

9.' A fuel p'ump as" clime'din claim 1 chwrcterized by the provsion of en enlar'gement at one end of the pist'on,` a cylinder reeeivin g the pisten;` and havingan enlarged portion re'eeivn g* the' enlarged portion of the piston; said pist'on having-e longitu'dinal bore to'condnet fu'el'to the suetion valve and communcat'ng Wltli the* enlarged portion of the oylinder, the enlarged portion of said pisten be'ng zrdapted' to force 'lqud'fuel into the b'ore ott'le* pisten, and` valve controlled means ad'nitting liquid fuel to the enla'rged portion' of the' cylin'der.

'lOL A fuel pu mp as claimed in claim 2 chti 'c-terized by the pr'ovision of an enlergeme'nt at one end ot the' piston', a cylinder receiving 'tle pstor and having an en large@ portion receiving the enlrged portion of the pisten; seid'piston having a' longitudnal bore to-eonduet fuel tothe suctio'n" valve' and communioating With the en largd portion of the cylnder, the enla'rged portion of said piton being 'edapted to=force li'q-uid- 'fuelinto"` the boreofthe piton, and v lv* controlledmeans zfdinit'ting liquid fuel to the 'enlrged" portion of the c'y-linder.

l-1 A feel pu'mp as claimedin' claim 3 eharaeter'z'ed by the p'rovision of an enlargement at one end of the pisten, a cylinder said piston being adapted to force lqud fuel recevng the pston and having an enlarged into the bore of the pisten, and valve conporton recevng the enlarged portion of trolled means admittng lqud fuel to the 10 the piston, said pston having a longtudnal enlarged portion of the cylinder.

5 bore to conduct fuel to the suction valve In Wtness WhereofIhaVe hereunto signed and communcatng With the enlarged pormy name. tion of the cylnder, the enlarged portion of RUDOLF WALKER.

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