DE2051944A1 - Improved electromagnetic injection nozzle with servo device - Google Patents

Description

Improved servo electromagnetic injector

The present invention relates to an improved electromagnetically controlled servo injector.

They are already electromagnetically controlled fuel injectors known for internal combustion engines that have one with the movable armature of the controlling electromagnet have associated plunger or piston, which cooperates with a calibrated injection opening to to control their opening. The injectors of this type work to the full satisfaction of their response time and atomization is concerned, but with them the pro

109810/1261

ORKaINAL INoPtCTED

_ ₂ _ 20519A4

Time unit limited to the maximum amount of fuel that can be injected. It has already been suggested to avoid this difficulty to avoid providing an injection nozzle provided with a servo device, which is an injection nozzle needle has, which by means of a biasing spring and by means of the pressure of a pressure fluid fed into a counterpressure chamber is held in the closed position on the injection port, with the back pressure chamber around the rear of this injector needle is arranged around. To produce an injection, an electromagnetic one is used Open valve that this back pressure chamber in connection with an outlet or return line of the Brings liquid to a reservoir. By arranging a throttle opening between the inlet of the pressure fluid and the back pressure chamber one obtains such a pressure drop that the pressure in the back pressure chamber during the opening the solenoid valve lowers enough, and the pressure of the liquid raises the injector needle and the injection begins. When the solenoid valve closes, the counter-pressure chamber is again activated via the throttle opening Pressure fluid is filled and the injection nozzle needle is pushed into its closed position by this pressure.

'' ι ■ '■' ■ ", ^: . ^r T '

Although injectors of this type are satisfactory for many applications, it should be noted that they also have some drawbacks. For example, * is the

109819/1261

The passage cross-section of the solenoid valve is rather limited for structural reasons, but must be larger than that the throttle opening to relieve the pressure chamber. It follows that with injectors of this type, the pressure drop in the back pressure chamber when the solenoid valve is opened and also the pressure increase go relatively slowly when closing and that the pressure at an injection duration of about 2 ms, which the in the case of diesel engines, the maximum permissible injection duration only drops to a value that is still relatively high is. This results in an injection curve that does not correspond to the desired one and that practically cannot be used Has influence. In addition, the relatively slow rise and in particular the atomization conditions affects the relatively slow closing of the injector needle in a negative way.

In addition, it should be noted that a leak or. Loss flow during the entire duration of the opening of the solenoid valve takes place through the throttle opening, whereby this amount of liquid as pure loss through the Pump is promoted and causes the fuel to heat up.

The object of the present invention is to create an electromagnetic injection nozzle with servo device,

10981 9/1? R 1

which avoids the disadvantages of the known injection nozzles of this type described above.

This task is based on a fuel injection nozzle with servo device for internal combustion engines, which has an electromagnetically controlled control or metering valve arranged in the injection nozzle housing and an injection insert or a mouthpiece with a nozzle needle arranged at one end of the injection nozzle, the nozzle needle being under the action of the injection pressure lifting it from its seat opens when the counterpressure normally applied to a surface of the nozzle needle suddenly drops due to the opening of the control valve an outlet or return line to the fuel tank and a line connected to a counter-pressure chamber interacts, the open-pressure chamber being in connection with a corresponding counter-pressure surface of the injection nozzle needle, and that these lines are arranged with respect to the control valve in such a way that, in one position of the control valve, a connection is established between the feed line for pressurized fuel and the line connected to the counterpressure chamber

109819/1261

is, while in the other position of the control valve a connection between the with the back pressure chamber connected line and the outlet or return line is made.

Advantageous further developments of the injection nozzle according to the invention are described in the subclaims.

In the following the invention is illustrated schematically Drawings of exemplary embodiments explained in more detail.

It shows:

1 shows a longitudinal section through an injection nozzle according to the invention according to a first embodiment;

2 shows a longitudinal section through an injection nozzle according to a second embodiment;

Fig. J? a longitudinal section through an injection nozzle according to a third embodiment;

4 shows a longitudinal section through an injection nozzle according to a fourth embodiment;

5 shows a longitudinal section through an injection nozzle according to a fifth embodiment;

6 shows a longitudinal section through an injection nozzle according to a sixth embodiment.

1 0 9 fi 1 9/1? Π 1

As can be seen from these figures, the injection nozzle has a hollow housing 1 on which an actual Injection nozzle or a mouthpiece 2 with an injection nozzle needle 3 by means of a fastening screw 4 and a Supply line 5 for the pressure fluid, and by means of the screw 16 an insert part 8 and the fixed part or Core of an electromagnet 9 are attached. The injection nozzle 3 is pushed by the plunger 6 and the ball 7 acting biasing spring 11, and the pressure of the liquid in a counter pressure chamber Id, which is on the surface of the injection nozzle needle 3 acts, which faces this counter-pressure chamber, pressed onto its seat. The plunger 6 includes a Shoulder 6a on which the pretensioning spring 11 rests and a cylindrical extension 6b on a guide insert 12 slides. Characterized in that a check valve in the form of a ball 22 is provided in the guide pin 12, wherein the ball 22 is pressed onto its seat by means of a spring 21 which is supported on a threaded insert 20 that has been drilled through is obtained, a damping of the lifting of the injection nozzle needle 3> is obtained in contrast to this, the lowering is not slowed down. This damping is in certain cases useful to get a gradual start of injection.

A punch 13, which is hollow in this exemplary embodiment, which is fixed to the movable anchor '13a of the electromagnet 9

1 0 a ίΠ Π / 1? 6 1

2Q519U

is connected, slides with a fit that is as tight as possible in the insert8. The insert part 8 has a pressure fluid supply line 8d which opens into an annular chamber 8c, as well as a discharge or Return line 8b, which is connected to an annular chamber 8a and the connection 10 of the liquid return line in Connection is as well as a connection line 8e, to the back pressure chamber Id.

The line 8d receives the pressure fluid via '

a formed in a screw insert 17 throttle opening 17a, and the line Ic, which via the line la with the Line connection for hydraulic fluid 5 is in communication, wherein the line la is extended by lines Ib and 2a up to the seat of the injection nozzle needle.

The punch 13 has transverse openings ljjd, which establish a connection between the annular chamber 8c and the inner outlet conduit 13e of the punch 13. A Control slide 14 is pressed against the solid core of electromagnet 9 by the pressure of the liquid. and is fitted into the punch 13 with very little play. The stop formed by a bevel or edge 14a and a cavity 14b on the control slide 14 rests on a flat surface 13c of the stamp when this is in its raised position and thus closes a through opening 13b in the stamp 13.

109819/1? G1

The electromagnet 9 is on the one hand with ground and on the other hand connected to a contact plug 15 and its position or position is determined by a screw bolt 27. The insert part 8, however, is not against Rotation secured, and the liquid flows through an annular channel 8f when the line Ic and the throttle opening 17a are not exactly opposite each other.

The function of this injection nozzle is described below. As long as the electromagnet 9 is not energized, the punch 13 rests on its seat and thus prevents the Admission of pressure fluid to the annular chamber 8a and the outlet line 8b. The hydraulic fluid fills the Lines la, Ib, Ic, 2a and 8d, the annular chamber 8c and the counterpressure chamber Id by pushing them through the inside 13e of the stamp 13, the opening IJb and the line 8e flows. In this way, the injection nozzle needle 3. is kept closed by means of the pressure, and so is the plunger 13 is also kept closed because the diameter the seat of this stamp on the input of the line 8e is smaller than the Durohmesser of the control slide 14, which is pressed against the stationary core of the electromagnet 9 by this pressure.

When the electromagnet 9 is energized, the armature 13a is attracted upwards and lifts the plunger 13 from its seat, but at the end of the movement the flat surface 13c

109819/1261

-Q-

of the ram 13 against the stop of the control slide 14 is created. This has the effect that the connection between the pressure fluid and the counter-pressure chamber Id is interrupted while this counter pressure chamber Id is connected to the outlet pipe 8b. The counter pressure disappears so and the injection nozzle needle 3 is raised to allow an injection. The opening of the Injection opening does not suddenly open in the pail shown take place, since the upward movement of the plunger 6 by means of the rear (

check valve is braked. The electromagnet 9 is excited by an electrical signal, the duration of which is a function of an electronic device known per se is determined by the operating conditions or the operating state of the engine.

At the end of the signal, the excitation of the electromagnet 9 ends and the plunger Ij5 returns to its seat in order to close the connection between the counter-pressure chamber Id and the outlet line 8b again. The return ™ of the plunger takes place through the pressure of the liquid in the annular chamber IJe, since the diameter of the sealing edge on the control slide 14 is smaller than that of the control slide itself.

109819/1261

It should be noted that between the outer end positions of the ram I3, the pressure fluid supply line 8d, the connecting line 8e with the back pressure chamber Id and the outlet line 8b simultaneously with one another are in connection and a certain leakage flow develops during this time. This leakage flow must be kept to a minimum in order to avoid having a very large and expensive power pump must be provided and to avoid difficulties when starting. This difficulty can be avoided, by the path of the punch 13 between its end positions is limited to a few hundredths of a millimeter, the Pressure drops between the sealing surfaces of the ram 13 and its seat in the insert part 8 and between the surface 13c and the edge of the control slide 14 are sufficiently large to substantially increase the leakage flow or the leakage loss reduce without hindering the rapidity of pressure build-up and pressure reduction in the back pressure chamber Id.

It should be noted, however, that this solution loses some of the advantages of the injection nozzle according to the invention. The functioning or the mode of operation of the injection nozzle according to FIG. 1 is practically independent of the movement of the plunger 13, which can be between a few hundredths and a few tenths of a millimeter . From this it follows

109819/1761

that the manufacturing tolerances can be relatively large. To keep this advantage of the injector, a screw insert is in the supply line 8d of the hydraulic fluid 17 is provided which has a throttle opening 17a. In this way, the leakage flow depends essentially only on the pressure drop in the throttle opening 17a and can in a certain extent the pressure build-up in the back pressure chamber Id after the end of the excitation of the electromagnet and thus delay the closing of the injector needle. j

However, this is not necessarily a disadvantage, since in this way one can observe the regularities of the injection when Can affect closing. In Figs. 2 and 3 is a Injection nozzle shown, which avoids the losses resulting from the simultaneous opening of the lines. In these In both cases, the metering or control valve comprises a distributor slide, which in the case of FIG. 2 directly by means of the electromagnet 9 and, in the case according to FIG. 3, is controlled indirectly by means of the electromagnet 9.

According to FIG. 2, the insert part 8 comprises three annular chambers 8c, 8m, 8a, each with the hydraulic fluid supply lines 8d and 8k or with the connecting line 8h and the back pressure chamber Id and with the outlet line 8b are connected. The punch or distributor slide I3, which is fixed to the movable Armature 135a of the electromagnet 9 is connected,

109819/1

includes a portion of smaller diameter 13g, the Length is dimensioned so that they either in the rest position, the chambers 8c and 8m or when the Electromagnet 9 is energized, which releases chambers 8m and 8a, or opens so that in the first position the distributor slide 13 is supported by a bolt 27 Pre-tensioning spring 28 is pushed down, the open pressure chamber Id in connection with the pressure fluid szufuhrleitung 8k is while in the second position the back pressure chamber Id is in communication with the outlet line 8b.

By carefully choosing the size of the stepped or smaller diameter part 13g and the size and spacing of the annular chambers 8c, 8m and 8a, the flow of pressure fluid is interrupted, before the drain line is opened and vice versa, so that no leakage losses can occur.

Since the control slide executes relatively large axial displacements, there is a through opening in its interior 13b provided in order to equalize the pressures between the two sides of this control slide.

The insert 8 is centered in its bedding or secured against rotation by means of a pin 25.

109819/1261

In order to avoid direct control of the control slide, the shifts of a few millimeters of the Armature Ij5a of the electromagnet 9 would make it necessary whereby the response time of the injection nozzle would be increased, one has a freely movable one in the embodiment according to FIG. 3 Distributor slide 29 is provided, the offset or reduced diameter of which Section as in the case described above with the annular chambers 8c, 8m and 8a and thence jewells with the hydraulic fluid supply lines 8k, 8d via the line 12a with the counter-pressure chamber Id and with the outlet line 8b cooperates.

The movable armature 13a of the electromagnet 9 is connected to a resilient membrane 34 which is installed in the insert part 8 in a sealing manner. The two so educated Chambers 30 and 31 are each filled with liquid Lines 8p and 8h connected to chambers 32 and 33. This arrangement causes the movement of the diaphragm 34 displaced liquid the movement of the distributor slide 29 controls. Assuming that in the rest position, the slide 29 is in the position shown in the drawing Position is, the excitation of the electromagnet 9 causes a displacement of the movable armature 13a of the electromagnet and the membrane 34 connected to it

109R19 / 1? B1

upwardly with a corresponding Plüssigkeitsmenge from the chamber 30 i ⁿ the chamber 32 is displaced, while the same Plüssigkeitsmenge is sucked from the chamber 31 from the chamber 33rd Because of this, the spool 29 moves to the right, closing the annular chamber 8c and opening the annular chamber 8a. When the excitation of the electromagnet 9 is stopped, the reverse movement takes place. According to the position of the

Slide 29, therefore, one has either a connection between ^ _s the pressure fluid supply lines 8d, 8k and the back pressure chamber Id through the line 12a, or between the back pressure chamber d and the line terminal 10 via the outlet 8b and the annular space Ie.

By suitable choice of the diameters of the membrane 34 and the distributor slide 29 is obtained a displacement of this slide 29 of several millimeters, while the associated movement of the membrane is only a few tenths of a millimeter. Therefore, it is possible as a result of a ^ smaller air gap an increased magnetic attraction and thus to achieve a very short response time of the injection nozzle. -

The axial bore 29a in the slide 29 and likewise the line connection 10a provided with its throttle opening 10b are provided to prevent thermal expansion and un-

10981 97 1 26 1

, 2 O 519 A 4

-Ip-

evenness of the diaphragm J4 and the slide 29 to compensate for the displaced volume.

In the embodiment according to FIG. 4, it also controls the movable armature IJa connected stamp IJ with his conical end the passage between the annular chamber 8a and the line Be, the line 8e over the Bores 8g and 8h connected to the back pressure chamber Id is. When the stamp IJ rests on its seat like this, {

he lifts a ball 18 by means of a pin IJd from their seat, so that a connection between the hydraulic fluid supply line 8k via the bores 8g and 8h and the back pressure chamber Id. The hollow stamp IJ and the ball 18 are by means of the reset or * w. Preload springs 28 or 19 pressed onto their associated seats, and the stamp IJ is lifted from its seat while the electromagnet 9 is energized, compressing the biasing spring 28 while the ball rests on its seat and loaded by the bias spring 19 and with the pressure the liquid is acted upon, the counter-pressure chamber Id via the bores 8h and 8g, the line 8e and the Chamber 8a is connected to the outlet line 8b.

The hole IJb in the punch IJ is used in this embodiment to equalize the pressure in the ram and the chamber 8a during the movement of the ram IJ.

109819/1761

Pig. 5 shows an embodiment in which one in a space 8m provided ball 18 in the non-excited position of the electromagnet 9 a passage opening 26a closes, which is formed in the screwed-in element 26 and in the energized position of the electromagnet 9 the Passage 8e closes. For this purpose, the stamp 13 comprises a Extension in the form of a pen IJd, which is on a Side of the ball 18 is supported, while a thrust element 24, which is also an extension in the form of a pin 24a has is pressed by means of the spring 19 against the other side of the ball l8. The space 8m in which the ball is l8 is located via the bores 8g and 8h with the back pressure chamber Id connected, while the annular chambers 8a and 8c with the pressure fluid supply line 8d and 8d, respectively. via the line 8n and the annular collecting channel Ie connected to the line connection 10 for the return of liquid into the reservoir or the storage container are. The bore 8b is intended to the pressures in the chamber 8a and the cavity in which the movable armature 13a of the electromagnet 9 is located to balance.

It should be noted that the pressure exerted by the spring 19 must be greater than that due to the pressure of the fluid force exerted on the ball 18 when the ball 18 comes to close the passage 8e and

19/1761

that the pressure exerted by means of the spring 28 must be higher than the pressure of the spring 19 in order to prevent the ball 18 due to the opening 26a when the electromagnet 9 is not energized.

Fig. 6 shows yet another embodiment of an injection nozzle, said injection nozzle 5 and 5a up two line connections for the supply of pressurized fluid a

has, the connection 5 to the injection nozzle needle leading lines la and Ib feeds, while the connection 5a pressure fluid for the back pressure chamber Id via a Hole 9a in the solid core of the electromagnet 9, an opening 35a in the resilient membrane 35 and the line 8h supplies, when the electromagnet 9 is not energized. The stamp IJ closes with a conical sealing element Ij5b the line 8e, which leads via the bore 8n and the annular channel Ie to the outlet line connection 10, while the ball 18 is lifted from its seat. When the electromagnet 9 is energized, the movable armature IJa is attracted and pushes the ball 18 against its seat at the end of the line 9a and thus closes the supply of pressure fluid, while at the same time the connection between the open pressure chamber Id and the outlet line 10 is opened.

1 0 9 8 1 9/1? R 1

It should be noted that in the exemplary embodiments according to FIGS. 4 and 5 and 6 a certain leakage flow can form, as the supply lines of the pressure fluid and the discharge line during a short Moments are open at the same time, as already based on the embodiment according to Pig. I was mentioned. This loss or this leakage flow can in the same way either by reducing the movement of the movable Armature IJa or by arranging a throttle opening can be avoided in the hydraulic fluid supply line.

A constant injection of fuel through a jammed or seized injection nozzle needle can be caused to avoid, you can use a known limiter of the flow rate in the pressure medium supply line between the nozzle needle and the branch leading to the control valve and the back pressure chamber arrange. The flow rate limiter automatically closes the line when the flow rate has reached a certain level exceeds a predetermined value.

All information and features disclosed in the documents, in particular the disclosed spatial design, are, insofar as they are individually or in combination new compared to the state of the art, as essential to the invention claimed.

1 0 9 H 1 9/1 7 R 1

Claims (11)

Expectations (l. ) Fuel injection nozzle with servo device for internal combustion engines, which has an electromagnetically controlled control or metering valve arranged in the injection nozzle housing and an injection insert with a nozzle needle arranged at one end of the injection nozzle, the nozzle needle being lifted from its seat under the action of the nozzle Injection pressure opens when the counter pressure normally applied to a counter pressure surface of the nozzle needle suddenly drops due to the opening of the control valve, characterized in that the control valve (13 * ΐδ, 29) can assume two positions and with a supply line (8d, 8k, 9a) for pressurized fuel, as well as with an outlet or return line (8b, 8n, 8e) to the fuel container and one with a ύ Back pressure chamber (Id) connected line (8e, 8g, 8h, 12a) cooperates, the counter-pressure chamber (Id) in connection with the counter-pressure surface of the injection nozzle needle (3, 6) is, and that these lines are arranged with respect to the control valve such that in the a position of the control valve establishes a connection between the supply line for pressurized fuel and the line connected to the back pressure chamber (Id) 10 9 8 19/1761 established, while in the other position a connection between the with the counter pressure chamber (Id) connected line and the outlet or return line is made. 2. Injection nozzle according to claim 1, characterized in that the control valve comprises a distributor slide (13) which is connected with one of its ends to the movable armature (13a) of an electromagnet (9) and is displaced in a bore and one, a reduced Diameter having section @ -3g), wherein the the distributor slide (13) receiving bore has three annular chambers (8a, 8m, 8c) which are arranged in the axial direction at equal distances from one another, these distances are dimensioned so that the , a reduced diameter section (13g) of the distributor slide (13) in its outermost positions of the distributor slide (13) covers two of the annular chambers (8a, 8m, 8c) at the same time, and that the middle annular chamber (8m) in connection with of the back pressure chamber (Id), while the outer annular chambers (8c or 8m) are in connection with the supply line (5) of the pressurized B fuel or with the outlet or return line (10). 109819/1761 3. Injection nozzles according to claim 1, characterized in that the control valve has a Comprises distributor slide (29) which is displaceable in a bore and a, a reduced diameter comprising part of a certain length, the distributor slide (29) receiving Bore has three annular chambers (8c, 8m, 8a) arranged axially at equal distances from one another, and these chambers are spaced from one another such that the one having a reduced diameter Part of the distributor slide (29) in its outermost positions two of the annular Chambers (8c, 8m, 8a) covers simultaneously, the middle annular chamber (8m) with the counter-pressure chamber (Id) in communication, while the outer annular chambers (8c, 8a) in communication with the Feed line (5) of pressurized fuel or with the outlet or return line (8b, 10) stand, and that an electromagnet (9) is provided, the movable armature (Ij5a) with a resilient Membrane (jH) is connected, the latter two separate chambers filled with liquid (j50 or j51) limited, each of which has a line (8p or 8h) with one of the two ends of the distributor slide (29), in which the distributor slide (29) receiving 19/1761 _ ₂₂ - 20519U Bore formed chambers (32, 33) is connected in such a way that the liquid the distributor slide (29) depending on the position of the movable armature (13a) moves. 4. Injection nozzle according to claim 3 *, characterized in that the distributor slide (29) is penetrated over its entire length by an opening (29a) ™ of small diameter, the one Represents the throttle opening and that one of the chambers (30, 31) delimited by the resilient membrane (34, 35) via a connecting line having a throttle opening (10b) (10a), is connected to the outlet or return line. 5 Injection nozzle according to Claim 1, characterized in that the control valve (13 * ^ 13d, l8) one with the movable armature (13a) one Electromagnet (9) connected stamp (13), which comprises a pin-shaped extension (13d), which extends through an opening (8e) which represents the seat of the stamp (13), the pin-shaped extension (13d) can be in contact with a ball (18) arranged in a chamber, and that this Chamber with the supply line (5, la, Ic, 8d, 8k) of 109Π1 9/1761 pressurized fuel is in communication, while the passage (8e) receiving the pin-shaped extension (13d) of the plunger (13) is in communication (8g, 8h) with the counterpressure chamber (Id) and a chamber (13) surrounding the plunger (13) 8a) is in connection with the outlet or return line (8b, 10) in such a way that in the rest position, when the electromagnet (9) is not energized, a biasing spring (28) provided for this purpose places the plunger (13) on its seat presses ( whereby the ball (l8) is lifted from its seat by means of the pin-shaped extension (13d) and thus brings the feed line (5, la, Ic, 8d, 8k) of pressurized fuel into communication with the counter-pressure chamber (Id), while in the attracted position of the movable armature (13a) of the electromagnet (9), the plunger (13) is lifted from its seat and the ball (18) is pressed onto its seat by means of a biasing spring (19) and the pressure of the fuel, whereby then a connection between the back pressure chamber (Id) and the outlet or return line (8a, 8b, 10) is made. 6. Injection nozzle according to claim 1, characterized in that the control valve (13, 13d, 18) includes a ball (18) in which it 109819 / l? FM receiving chamber (8m) can move between two seats, the chamber (8m) receiving the ball (l8) being in connection (8g, 8h) with the counterpressure chamber (Id), and the opening (26a) of one seat of the ball (18) with the outlet or return line (8c, 8n, Ie, 10) is in connection, while the opening (8e) of the other seat of the ball (18) with the supply line (5 * Ic, 8d) for under pressure standing fuel is connected, and that a displacement of the ball (18) by means of a first pin (13d) which is connected to the movable armature (13a) of the electromagnet (9) is controlled, the movable armature (13a) with a Biasing spring (28) is provided in such a way that in the rest position the ball (18) is pressed onto its seat by means of the pin (13d) and the connection with the outlet or return line (8c, In, Ie, 10) closes, while in the attracted position of the movable armature (13a) ψ the ball (18) by means of another biasing spring (19) is pressed onto its other seat and closes the connection with the supply line (5, la, Ic, 8d) of pressurized fuel. 7. Injection nozzle according to claim 1, characterized in that the control valve has a with the movable armature (13a) of an electromagnet 19/1761 (9) has connected stamp (13, 13b), which is shown in its rest position, when the electromagnet (9) is not energized, the outlet or return line (8e, 8n, 10) closes, and that the solid core of this electromagnet (9) is penetrated by a bore (9a) which is connected to a supply line (5a) for pressurized fuel and axially on this punch (15) opens, with a ball (18) or an analogous component in a corresponding chamber of the punch t (IJ, 13t ·) is provided in the tightened position the movable armature (13a) of the electromagnet (9) the bore (9a) in the fixed core of the electromagnet (9) closes and that a connecting line (35a, 8h) between the chamber in which the movable armature (13a) of the electromagnet (9) is located and the counter-pressure chamber (Id) is provided. 8. Injection nozzle according to claim 1, characterized in that the control valve has a Has punch (I3) which pierces over its entire length and with the movable armature (13a) of the electromagnet (9) is connected and sealingly in one Insert part (8) slides in which a first line (8d) for the supply of pressurized fuel, a second line (8b) to the outlet or for the return of the 1 0 9 R 1 9/1? fi 1 Fuel and a third line (8e) leading to the pressure chamber are accommodated, the first (8d) these lines open essentially in the middle of the length of the punch (13) and this punch (13) in this area has lateral openings (13d) which establish a connection between the first line (8d) and the interior of the stamp (13), and that the the second (8b) of these lines opens into a space (8a) which is located above the conical seat of the tip of the punch (13) around
and / is arranged around the punch (13), while the third line (be) comprises the opening of the seat of the tip of the punch (13), and that the punch (13) inside, in the part pointing towards its tip has a sealing seat (13c) which cooperates with a control slide (14) which is arranged displaceably in the punch (13), but allows a connection between the lateral openings (13d) and fc of the tip of the punch (13), wherein the plunger (13) rests on its conical seat in the rest position and the control slide (14) is lifted from its seat (13c), while the plunger (13) is in its raised position as long as the electromagnet (9) is excited is located and is lifted from its seat and the control slide (14) rests on its seat in the interior of the punch (13). 19/1761 9. Injection nozzle according to one of Claims 5, 6, 7 or 8, characterized in that the supply line (Ic, 8d; 5a, 9 &) for under pressure standing fuel to the back pressure chamber (Id) with a calibrated one located in front of the control valve Opening (17a) is provided. 10. Injection nozzle according to one of claims 1 to 9, characterized in that the injection nozzle needle (3) extended by means of a plunger (6) is, which in the area of its end remote from the injection nozzle needle (3), a shoulder (6a) has on which a biasing spring (11) is supported and that, moreover, in the region of this end of the plunger (6) a cylindrical recess is provided in which with a relatively tight Fitting a guide element (12) slides that has a through opening has to establish a connection between the cylindrical recess and the counter-pressure chamber (Id) to produce, this through-opening interacting with a ball (22) forming a check valve in such a way that that the through opening allows the passage of liquid if the volume of the room between the plunger (6) and the guide element (12) as a result of the injection nozzle needle (3) closing 10981 «/ 1? £ 1 BATH ORIGINAL increases that this through-opening, however, with a movement of the nozzle needle (3) in the opposite direction is closed by means of the ball (22), this assembly (6, 12, 20-22) being a single-acting hydraulic Represents attenuation. 11. Injection nozzle according to one of claims 1 to 10, characterized in that a per se known flow limiter in the supply line (la, Ib, 2a) of the pressurized fuel. between the injection nozzle needle (3) and the junction (Ic) is provided for the control valve. 10981 9/1? F> 1 Blank page