DE1815260A1 - Fuel injector - Google Patents

Description

R. 9351
12/11 T968

Attachment to

Patent and

Utility model auxiliary registration λ

KOBEKT BOSCH GMBH, 7 Stuttgart W, Breitscheidstrasse

Fuel injection valve

The invention relates to a fuel injection valve with
a shaft-shaped valve body made of two coaxial to one- μ

arranged on the other and thereby at least one longitudinal fuel channel enclosing pipes, which are sealed at the ends and which has an inflow channel and an outflow channel, with one of the movable valve member and the Spritζ openings receiving nozzle body, which closes one end of the shaft-shaped valve body, with the drainage channel an injection valve in the dune body to the pressure chamber ^ - -guiding channel connects and with one the tributary carial containing connector for the fuel pressure line the injection pump.

—2—

009828/0745

Robert Bosch GmbH - R. 9351 SuA / a

Stuttgart

In a known fuel injection valve of this type (see French patent specification 1 5 ^ 6 678) is in the Between the two coaxially arranged tubes another tube of the same length is pushed into the tube for formation of the longitudinal fuel channel a correspondingly long slot is made. These tubes are after telescoping soldered together. Then drill holes in the outer tubes at the appropriate points an inflow or outflow to the longitudinal fuel channel is provided. Care must then be taken when assembling the injector v / earth that this inflow or outflow bore in overlap comes with the fuel channels located in the nozzle holder or dune body. Such a production is relative ig time-consuming.

The invention is based on the object on a vies entlich a more economical way of using such a fuel injector to manufacture.

The invention is achieved in that the shaft-shaped Valve body through at least the following process steps is made:

a) two at least approximately equal-width steel strips, whose sides in contact are copper-plated, whereby in one of these sides, at least one longitudinal groove is incorporated along channel-than- fuel being formed into a tube 'and welded at the longitudinal seam,

b) from the pipe manufactured according to a) correspondingly long pieces are cut off with the Pipe walls for sealing the longitudinal duct against each other be rolled,

«Nn naißlNAL 009828/0745

Robert Bosch GmbH E. 935 ^ ßu / Wa

Stuttgart

c) brazing the valve body.

In such a manufacturing process, the pipe, after it has been manufactured in a drilling and drawing nozzle with a subsequent welding process, can be cut to the required length in each case. This is not possible in the manufacturing process used for the known valves, since the longitudinal fuel channel, depending on the length of the. i

Valve body sized no must.

With a tubular valve body produced in this way the longitudinal fuel channels are not compressed by the drawing in of beads in the pipe section. One· advantageous embodiment of the invention therefore provides that before brazing in the hohrstück beads, inobeTor.df-rr Corrugations are drawn as shoulders or ancch-Η ·> the? eilc- Ο'Ιγοκ-body fastened in or on the earpiece, lcderteller ^ connector, etc;) serve.

Around all fuel channels with as narrow as possible. Flow widex ^ stood at the irr; LüsenLalter or Lürenkörr ··: join (contained liquid channels, e-Ino besondei ^ e Ausf: estaltung the invention; provided such that the inflow channel and the outflow channel in itself be-kpnntcr for vveise electrolytically incorporated into the Eohrstück '.. "inr-special is designed as a Kingnut.

Two injection valves manufactured in accordance with the invention are shown in FIG the Soichnunr; and are described in more detail below, ! ν? demonstrate·.

0 0 9 8 2 8/0745

Hobort Bor, cJi GmbH E. 935 ^ Su / Wa

Stuttgart

r'ig. ^Λ the first embodiment in longitudinal section, Fig. 2 a cross section through the steel strips

which the tubular valve body is pulled, Hg. 3 a (cross-section through a valve body, i'ig. U the second embodiment in longitudinal section.

In the first exemplary embodiment according to FIG. 1, a very shaped valve body 1, in which there are longitudinal channels 2 for the fuel supply, is closed at one end by a nozzle body 3. On the other linden of V (ntilkörpers 1 an annular design Anrchlußtei 1 4 is pushed, the hinspri tzpumpe backward extending pressure line * y is connected to a not shown of the. CBER a carved into the outer jacket of the valve body hingnut 6, the pressure line 5 with all Längrkanälm ?. Connected.

In the B (I ¹ CiCl ₁ c <r 1 üsenkörpers · 3 i ^ t an I <ingnut 8 in the Innenir.nntel of the Vr nti! Körpers "arranged, the longitudinal channels 2 with a pressure chamber 10 rir-r via at least a bore 9 Linspri tzvntil s connects, the Lvuckraum 10 is are; tr by Vn nozzle body 3, on the other hand by an ent- '.Of-CTi dor K: -'"- ft a return spring ^ΛΛ in the nozzle body 3 rixi BlvrrrcL: ^r bbar mounted c valve needle ^ 2. Lie Luckrtel Iff <'.' ·· * ^Λ is supported by a ΙΎ-dertell er 13 on f. Ir. ^R -r · in ei 'π ".'--- ntilkörpor f; ingezor ^r nen; vingsicke "^ i nb, the in 'i'.ir. Inn'.r.;': - .. r. of the vent: body - · 1γ '. ^ chultei ¹ ^^' nusgf, - biidf- ^4. is · . * <: Lüronkörpor 3 j η df: η Vonti lkörpoi- "eingf ·: chr-dusted 'ru avoid ^ ₁ that PYraftstoff from DOI Itingnut & in the lnnt.n: -.. ?: order of Vf .ntilkörpers, there is an annular sealing element 16 between the V'nti! body and a two.:. ^{+ f} .n shoe. ^{+, f-:}

009828/0745

BATH OMGWAL

Robcrt Bor.ch GmbH E. 9351 SuAa

Stuttgart

arranged. The interior of the valve body 1 is, nn his, the nozzle body facing away from the end with a - not ".shown relief line connected.

The shaft-shaped valve body 1 is produced according to the following process:

Two steel strips 20 and 21 (see FIG. 2), at least approximately the same width and copper-plated on one side, are placed on top of one another with the copper-plated edges and formed into a tube by a tube. In the steel strip 21 there are longitudinal grooves on the copper-plated side ? 2, from which, after forming into an egg-shaped ear, longitudinal channels have become. The longitudinal seam section is then welded by a fascine, the wedge-shaped gap created by the tubular shape being suitable for such a weld Pipe ^{1 shown} in cross section] according to ..

After the wedge-shaped weld seam 23 has been completed, the Saw the pipe to the required lengths. Then the ring beads 14 and 15 are rolled in and then the thread cut for the nozzle body 3 and the annular grooves 6 and "8 incorporated. The annular grooves 6 and 8 can be electrolytically be incorporated. Before or after the incorporation of these annular grooves 6 and 8, the ends of the valve body are used 1 serving pipe section rolled together, so that the longitudinal channels 2 formed by the longitudinal grooves 22 on these Ends are closed. Before this finished valve body is hard-soldered, the connecting part 4 is pushed on, after the contacting surfaces have been copper-plated.

-6-

0 0 9 8 28/0745 BAO OWGfNAL

Kobert Bosch GmbH R. 9351 Su / Wa

Stuttgart

While boi the embodiment of the nozzle body shown in Fig. 1 is screwed into the valve body, the nozzle body v.'ird 3 in the illustrated in Fig. 4 Aur.fühl'ungsbcispiel after insertion into the V'ntilkörper ^Λ birch to abut the shoulder formed by the bead 15 by rolling the valve body end. held over the Dür.enkör-per 3. This could also be done by rolling the valve body f-ioc into a corresponding annular groove provided in the nozzle body. The manufacturing process for the valve body ^Λ is the same as in the first example.

009828/0745 ^{BAD 0WGlNAL}

Claims (1)

181B 2BO IJobert Bor.ch GmbH H. 935 ^ Su / V Stuttgart Claims 1. Fuel injection valve with a stem-shaped tip Valve body hup two coaxially arranged and at least one fuel length channel Ends' closing pipes, which is sealed to the / abr. <And which has an inlet channel and an outlet channel, with a movable valve member and the nozzle body receiving the injection openings, which closes one end of the shaft-shaped valve body, whereby to the outflow: channel a channel leading in the nozzle body to the pressure chamber of the injection valve and with a connection part containing the supply air channel for the fuel pressure! cit, unr the injection pump, thereby r ^ '"^ nnmarks, dc3 der rch - ■? *: - shaped for valve body (') dv; rch at least for oil rend r Vf rfalirenr steps herpestell ⁴ Irt: η ^ zwr: at least approximately pic i wide steel] brine: fr (PC, 2 '' \ , whose contacting lead Vi-rkuvfr: · 'γΙκ :, vobi'-i in one of these sides ir.irvh rtens an I. änrrnu '(2Π) is ciiitreaworket as Ki'aftstofflänpskanal, v: e: - the shape of a tube and welded at the longitudinal seam, -8th- BAO OHIGiNAL 009828/0 74 5 1 ob crt Bosch GmbH R. 935 " ¹ Su / V / a Stuttgart b) from the pipe manufactured after a) are accordingly long pieces severed with those on both ends the pipe walls are rolled against one another to seal the longitudinal channel (22), κ c) brazing of s Vontile body (1). ?. Fuel injection valve according to Claim ", characterized in that, before brazing, beads (" ^Λ , "" ^Γ /, inrbrr, onde ^T · '. ',' [. ') or stops C ^/ "J ^I , ^/ ' 5 ^I ) the in thorn Cii ^ T- ^<; on the; chrr-tiicl: fortified ToIf: (Dür.enkbody Z>, i · '(-ei: ■■>;<- 11 <■: · ";', /.nrchl ufiteil A ur.v :.) serve. 1>. } ': ■: -. {' Tstof- ^'1: nnpri tzvf. nti-1 according to claim "or 2, data -uuz'ch rck-f ^f r.nr. leans, DALI before brazing by vorl'. f-riger. Vf rV.'1-ζ, ϊ ern the corresponding contact surfaces • ~ -: n rinff ^; ': τ .. r expanded connecting part ( ^y O over which V <ntilkör: · - (' } is pushed. ^. rr'.l "tr ⁺ , offr ^ rifprl tzventil according to one of the preceding claims, characterized in that: the i-jido of the valve Y. ^y : -T. (vr, C, after which the Lüsenkörpor (3) is inserted, , =., 009828 / 07A5 BAD OWGINAL Robert Bosch GmbH ^J E. 935> 1 Su / Va £ j £ uttp; art is rolled into an annular groove in its outer surface. ". Fuel injection valve according to one of claims 1, 2 or 4, characterized in that the inflow channel (6) and the drainage channel (8) in a known manner incorporated electrolytically into the pipe section (1) and is designed in particular as an annular groove. BATH ORIGINAL 009828/0745