Патент USA US2114977код для вставки
April 19, 1938-v I ‘H. c. EDWARDS > 2,114,977 NJECTOR Filed May 13, 1957 | | l' l 3 mmmwmmge 2,114,917 Patented Apr. 19, 1938 UNITED STATE s PATENT OFFICE amen roar. m'mc'roa Herbert 0. Edwards, Massillon; Ohio, assignor to, a , The Timken Roller Bearing Company, Canton, . Ohio, a corporation ofvohio" - Application May 13, 1931‘, Serial No. 142,406 SClaims. (Cl. 299-1073) This invention relates to fuel injectoraparticu > the portion thereof located‘inwardly of the an larly hydraulically operatedfuelinjectors for nular chamber "I. .. - compression-ignition oil engines. It has for its By the arrangement described, when sufficient principal objects to provide for simplicity and pressure is exerted by the injection pump or other ' 5 che'apness of construction of such devices, to facilitate assembly and disassembly of the parts,. and to obtain other advantages hereinafter ap pearing. The invention‘ consists in the fuel in-.. je'ctor and in the construction, combinations and 10 arragements of parts hereinafter described and device (not shown) on the oil in the annular chamber ‘I, which surrounds the tubular valve 3, such pressure operates to 'compress said tube so - that the wall thereof will move inwardly away from the annular rib l0 and thus open up an annular passageway to the annular chamber 6', 10 from which‘ the oil escapes through the annular In the accompanying drawing, which forms discharge ori?ce 8 at the discharge end of the part of this speci?cation and wherein like symbols ‘nozzle. when the pressure is relieved, the tubu-v refer to like parts wherever they occur,‘ ‘ lar valve expands against the rib l0, thus shut 16 claimed. _ Fig. 1 is a view of the outer or discharge end . ting off the flow of vfuel through the nozzle. The shape of the rib‘ 9 or the radiused or beveled of a fuel injector embodying my invention, ’ 15. Fig. 2 is a central longitudinal section on the line 2-2 in Fig. 1, ' Fig.3 is a cross-section on the line 3-3 in 20 Fig- 2; and > , ‘ v Fig. 4 is an enlarged central longitudinal sec tion of the discharge end portion of the injector. . The pressure operated fuel injector illustrated in the accompanying drawing comprises a cylin 25 drical nozzle member or portion I having a cy lindrical bore 2 extending axially therethrough from end to end thereof. Mounted in the bore 2 of the nozzle is a valve member in the form-of a outer end of the valve member may be changed to obtain the ‘desired spray characteristics. The pressure at which the nozzle will open vmay be determined by the wall thickness of the tubular 20 valve member and by the tightness of its ?t in the annular rib ll. The pressure which com presses the tubular valve also tends to expand the nozzle body; but said body‘ is preferably made heavy enough to resist suchexpansion. " ' 25 The above valve construction is simple and economical to manufacture; it can be readily as sembled and disassembled; and it dispenses with . thin-walled cylindrical tube 3 that ‘preferably ex the more expensive spring-loaded plungertype 30 tends from end to end of ‘said bore. Said bore is provided at the inner end of the nozzle'with a ?at-bottomed enlargement or counterbore-l; valves heretofore used with hydraulically oper- ' ate'd fuel injectors. ' What I claim is: ' 1. A fuel injector comprising a nozzle member end ‘of said nozzle with an enlarged cylindrical having a cylindrical bore therein and a cylindrii cal tubular member mounted in said'bore, said as head portion 5 that seats within‘ said counter members, cooperating to form therebetween .a bore. continuously open' annular discharge ori?ce at The valve receiving bore 2 of the nozzle l is ,en ‘larged intermediate betweenits ends to form two ' the outer ends thereof ‘and. an annular pressure . longitudinally spaced annular-chambers‘ 6 and ‘I, space located inwardly of said annular discharge 40 respectively, around the hollow cylindrical valve oriilce and separated therefrom by “an annular vand the tubular valve member is formed at said - The chamber 6 is a relatively short_ land on one of said members that' has a nor chamber that is located adjacent to the discharge mally fluid-tight surface contact with the cylin ‘end of the nozzle and opens into an annulardis- - drical surface of the other of said .members that member 3. charge ori?ce 8 formed by an accurately deter- _ permits relativeendwise expansion and contrac-. 45 mined clearance space between the valve mem > tion thereof with changes; of temperature, said ' : her and aninternalvannula'r rib or land 9; The ‘chamber 1 is a relatively longchamber that is f‘normally separated from the relatively short chamber.‘ by an internal annular rib or land .50 II and is supplied with fuel by one or more pas sageways II that lead from an annularvgroove ' I! in the inner or inlet end of said nozzle and .open into the chamber ‘I at the inner end there of. The valve member 3 has a light press-?t in 55 the innermost annular rib II of the bore and in annular pressure space being adapted to be sup‘ plied with‘ ?uid under pressure sui?cient to. cause‘ relative radial movement of said annular land and the portion of the member having surface contact therewith and thereby permit the fuel to pass therebetween. , ' 2. A fuel injector comprising a'nozzle member ' having a cylindrical bore therein and a cylin drical tubular member mounted in said bore, said ' members cooperating to form a continuously open 2 3,114,671 annular discharze'oriiice at the outer ends there‘ 01' and an annular pressure space located inward-. ‘ly of said annular discharge ori?ce, said bore having an annular land therein that has a nor ~mai1y ?uid-tight surface contact with the outer periphery of said tubular member so as tov'nor maily cut on communication between said an nular pressurespace and said annular discharge qriiice while permitting endwise expansion and mounted in said bore cooperating therewith to form an annular pressure chamber therebe tween, said bore having two axially spaced an nular lands therein, the outermost land being‘ spaced from said tube to form therewith a con tinuously open annular discharge ori?ce and the innermost annular land having a suri'ace contact with the outerv periphery of said tube (that nor- - mally cuts oil! communication between ‘said an contraction oi’ said tubular member relative to , nular. pressure space and said annular discharge said annular land, said annular pressure space ori?ce while permitting said tube to elongate and "beinz' adapted to be‘ supplied with fluid under contract endwise with changes of temperature, pressure sumcient to compress said tubular mem sald annular pressure space being adapted to be ber radially and thereby permit passage of the ' supplied with ?uid under- pressure su?lcient to 15 fuel between said tubular member ‘and said an compress said tube radially and thereby permit nular, land. . passage of the fuel between saidvalve member '3'. A fuel injector comprising a nozzle havin: a cylindrical bore therein and a cylindrical tube and said innermost annular rib. ' v . HERBERT C. EDWARDS.