CH179551A

CH179551A - Liquid fuel injector for internal combustion engine.

Info

Publication number: CH179551A
Authority: CH
Inventors: Witkowski Stefan
Original assignee: Witkowski Stefan
Priority date: 1935-03-05
Filing date: 1935-03-05
Publication date: 1935-09-15

Description

Injeeteur de combustible liquide pour moteur ä combustion interne. Lobjet de 1'invention est un injecteur de combustible liquide pour moteur ä combustion interne, comprenant une chambre de Pression limitee partiellement par une membrane soli- daire dune aiguille traversant 1e canal d'in- jection et en obturant 1'extremite. Liquid fuel injector for an internal combustion engine. The object of the invention is a liquid fuel injector for an internal combustion engine, comprising a pressure chamber partially limited by a membrane integral with a needle passing through the injection channel and closing the end.

L'injecteur selon 1'invention est caracte- ris6 en ce qu'ä 1'endroit de ladite obturation, ce canal se termine par un fond plat compor- tant une ouverture centrale debouehant exte- rieurement au fond d'un cöne, 1'extremite de 1'aiguille presentant une Partie plate perpen- diculaire ä son axe et susceptible d'obturer 1'ouverture du canal en s'appliquant contre 1e fond plat de ce dernier. The injector according to the invention is characterized in that at the location of said closure, this channel ends in a flat bottom comprising a central opening opening outwardly at the bottom of a cone, the extremity of the needle presenting a flat part perpendicular to its axis and capable of closing off the opening of the channel by pressing against the flat bottom of the latter.

Le dessin represente une forme d'execu- tion de 1'injecteur selon 1'invention, donnee ä titre d'exemple. The drawing represents an embodiment of the injector according to the invention, given by way of example.

La fig. 1 est une coupe vertieale axiale de cet injecteur en place sur un moteur; La fig. 2 est une vue en plan correspon- dante; La fig. 3 est une coupe par III-III de la fig. 2; La fig. 4 montre, ä plus grande echelle et en coupe, 1'extremite du canal et de 1'ai- guille, et La fig. 5 montre, egalement ä plus grande echelle et en coupe, la fixation du bord de la membrane de 1'aiguille. fig. 1 is an axial vertieale section of this injector in place on an engine; fig. 2 is a corresponding plan view; fig. 3 is a section through III-III of FIG. 2; fig. 4 shows, on a larger scale and in section, the end of the canal and the needle, and FIG. 5 shows, also on a larger scale and in section, the fixing of the edge of the membrane of the needle.

L'njecteur represente se compose dune chambre 1 de relativement grand diametre par rapport ä un tube 2 qui s'y trouve ajuste et soude en 3 et qui constitue un canal dans lequel se meut axialement une aiguille rainu- ree 4 commandee par une membrane 5. The injector represented consists of a chamber 1 of relatively large diameter compared to a tube 2 which is fitted therein and welded at 3 and which constitutes a channel in which moves axially a grooved needle 4 controlled by a membrane 5 .

Le canal d'injection constitue par 1e tube 2 se termine interieurement par un fond plat 6 et communique avec 1'exterieur par un ori- fice d'injection 7 de relativement Petit dia- metre et petite longueur par rapport au dia- metre du canal, cet orifice debouchant dans 1e fond dune ouverture conique 8 terminant 1e canal d'injection. The injection channel constituted by the tube 2 terminates internally in a flat bottom 6 and communicates with the outside via an injection orifice 7 of relatively small diameter and small length compared to the diameter of the channel. , this orifice opening into the first bottom of a conical opening 8 terminating the first injection channel.

L'extremite de 1'aiguille 4 se termine par une surface plate 9 perpendiculaire ä son axe et qui, par son application contre 1e fond plat 6 du canal, obture 1'orifice d'injection 7. -Cette extremite de 1'aiguille presente toute- fois un leger arrondi de son Bord, de maniere ä constituer entre son extremite et 1e fond du canal un Petit espace annulaire 10 dans lequel peut se loger du combustible. The end of the needle 4 terminates in a flat surface 9 perpendicular to its axis and which, by its application against the flat bottom 6 of the channel, closes off the injection orifice 7. This end of the needle has however, a slight rounding of its edge, so as to form between its end and the bottom of the channel a small annular space 10 in which fuel can be lodged.

L'obturation kaut ici obtenue par deux surfaces venant en contact dune manike qui doit eire rigoureusement parallele, il est ne- cessaire que 1'aiguille 4 sofft parfaitement di- rigee dans 1e sens axial, ce qui a lieu premie- rement par 1e fait d'un ajustement tres exact entre aiguille et canal et deuxiemement par 1e fait que la membrane 5 est elle-meme centrk et maintient par conAquent 1'aiguille en Bonne Position, meme si celle-ei devait avoir 1e plus leger jeu dans 1e canal. The obturation kaut here obtained by two surfaces coming into contact with a manike which must be strictly parallel, it is necessary that the needle 4 should be perfectly directed in the axial direction, which takes place firstly by the fact of a very exact adjustment between needle and channel and secondly by the fact that the membrane 5 is itself centered and therefore maintains the needle in the correct position, even if the latter should have the slightest clearance in the channel.

La fig. 5 montre comment ce centrage est effectue ä 1'aide d'un Petit epaulement 11 dune cuvette 12 dans laquelle un bouchon 13 vient serrer la membrane. fig. 5 shows how this centering is carried out with the aid of a small shoulder 11 of a bowl 12 in which a stopper 13 clamps the membrane.

A sa Base et exterieurement, la cuvette 12 est filetee en 14 et sur ce filetage se visse une bride 15 que deux vis de fixation 16 permettent de serrer au bloc 17 d'un moteur, la bride ne pouvant se fixer au bloc 17 qu'au plus dans deux positions differentes. At its Base and externally, the bowl 12 is threaded at 14 and on this thread is screwed a flange 15 that two fixing screws 16 allow to tighten to the block 17 of an engine, the flange being able to be fixed to the block 17 only at most in two different positions.

Le fait de sonder 1e tube 2 ä la cuvette 12 presente 1'avantage de constituer un or- gane homogene contenant la chambre et 1e canal, organe resistant bien aux f ortes Pres- sions saus qu'il sofft nkessaire d'exkuter pour cela une pike unique decolletee daus une Barre de gros diametre. The fact of probing the tube 2 to the bowl 12 has the advantage of constituting a homogeneous organ containing the chamber and the first Unique low-cut pike in a large diameter bar.

La disposition de la bride 15 sur la Par tie filetee 14 permet, d'autre Part, d'orien- ter 1'embouchure 18 de 1'injecteur dans n'im- porte quelle direction lors du montage. Comme an 1e voit en particulier dans la fig. 1, il suffit de visser la cuvette 12 dans la bride, de maniere ä ce que ces deux or- ganes occupent la Position relative voulue, puis de serrer les vis 16 pour que 1e tont sofft maintenu en place taut par 1'application de la cuvette 12 sur la surface exterieure du bloc 17 que par 1'ajustement de 1'extremite conique 19 du tobe 2 sur un siege correspon- dant de 1'interieur du bloc. Urre vis de reglage 20, traversant 1e bouchon 13, sert de butee limitant 1a. course de 1'aiguille, dorrt elle rencontre la tete. Cette vis est traversk axialement par un trou 21 necessaire ä 1'equilibrage des Pres- sions en arrike de la membrane 5. Cette disposition du trou 21 dans Faxe de 1'ai- guille presente 1'avantage qu'en enfilant un objet mince au travers de ce trou, il est fa- cile de se rendre compte de 1'ebat de Fai- guille. The arrangement of the flange 15 on the threaded part 14 makes it possible, on the other hand, to orient the mouth 18 of the injector in any direction during assembly. As seen in particular in fig. 1, it suffices to screw the bowl 12 into the flange, so that these two organs occupy the desired relative position, then to tighten the screws 16 so that the tont is held in place at all by the application of the bowl 12 on the outer surface of block 17 than by fitting the tapered end 19 of tube 2 to a corresponding seat inside the block. Urre adjustment screw 20, crossing the first stopper 13, serves as a stop limiting 1a. stroke of the needle, when it meets the head. This screw is traversed axially by a hole 21 necessary for balancing the pressures behind the membrane 5. This arrangement of the hole 21 in the axis of the needle has the advantage that by threading a thin object Through this hole, it is easy to realize Faiguille's antics.

Enfin, il a ete experimentalement de- montre RTI ID="0002.0275" WI="6" HE="4" LX="1322" LY="698"> que la construction dkrite de 1'extre- mit6 de 1'aiguille, du fond du canal et de Forifice d'injection donne les meilleurs r6sul- tats possibles quarrt ä la division extrAme- ment fine et 1'etalement du jet du carburant injecte. Finally, it has been experimentally shown by RTI ID="0002.0275" WI="6" HE="4" LX="1322" LY="698"> that the described construction of the end of the needle , of the bottom of the channel and of the injection orifice gives the best possible results with regard to the extremely fine division and the spreading of the jet of the injected fuel.

Afin de diminuer la Pression specifique sur 1'extremite de 1'aiguille, an peut prevoir, en arriere de ladite extremite, une Partie conique prenant appui sur un siege conique correspondant de la cuvette 12, ebne et ex- tr6mit6 plate de 1'aiguille etant rodes ensem- ble au moment de Fassemblage. In order to reduce the specific pressure on the end of the needle, one can provide, behind said end, a conical part resting on a corresponding conical seat of the cup 12, ebony and flat end of the needle. being lapped together at the time of assembly.

Claims

CLAIM Liquid fuel injector for an internal combustion engine, comprising a pressure chamber partially limited by a membrane integral with a needle passing through the injection channel and closing the end, characterized in that at the place of said obturation, this channel ends in a flat bottom having a central opening opening outwardly at the bottom of an ebne, the extremity of the needle having a flat part perpendicular to its axis and capable of blocking the opening of the channel by applying against the first flat bottom of the latter. SUB-CLAIMS 1 Injector according to claim, characterized in that the edge of the flat part of the extremity of the needle is rounded so as to leave a free annular space between the needle and the bottom of the channel of the needle. injection.

2 Injector according to claim, characterized in that the periphery of the membrane bears against a shoulder of the organ which carries it, so that said membrane is centered and contributes at the same time to , center the needle.

3 Injector according to claim, characterized in that the first injection channel, in a tube of relatively small diameter compared to that of the chamber, is fixed to the latter by welding, the chamber itself being orientable about its axis in that its attachment to an engine takes place by application by means of a flange screwed onto said chamber, this chamber being able to occupy various positions with respect to the flange, while the flange itself cannot attach to the motor in no more than two different positions.

4. Injector according to claim and comprising a member for adjusting the stroke of the needle, this member forming a stop for the head of the latter, characterized by an axial pressure balance orifice passing through the stop member.