DE102007047152A1 - Injector with an annulus separate anchor space - Google Patents

Abstract

The invention relates to an injector for injecting fuel into the combustion chamber of an internal combustion engine, in particular a common rail injector, with an injection valve element (10) which can be adjusted in the axial direction as a function of the pressure in a control chamber (14) between a closed position and an open position is, wherein the control chamber (14) by means of an adjustable valve sleeve (20) having, control valve (21) with an annular space (30) is connected, which is hydraulically connected to an injector return port (7), wherein the valve sleeve (20) for Cooperation with an electromagnet assembly (25) with an anchor plate (24) is operatively connected. According to the invention, adjacent to the annular space (30) there is arranged an armature space (28) which is separate from the annular space (30) and is separated from the armature plate (24) by the armature plate (24).

Description

State of the art

The The invention relates to an injector for injecting fuel in a combustion chamber of an internal combustion engine, in particular a Common rail injector, according to the preamble of Claim 1.

From the EP 1 612 403 A1 is a common rail injector with a pressure balanced in the axial direction control valve known. By means of the control valve, which has a sleeve-shaped control valve element (valve sleeve), the fuel pressure can be influenced within a control chamber bounded on the end side by an injection valve element. By varying the fuel pressure within the control chamber, the injection valve element is adjusted between an open position and a closed position, wherein the injection valve element releases the fuel flow into the combustion chamber of an internal combustion engine in its open position. The sleeve-shaped control valve element is connected to an anchor plate, which cooperates with an electromagnetic actuator for adjusting the sleeve-shaped control valve element. When the control valve is open, the fuel flows out of the control chamber through an armature space receiving the armature plate in the direction of an injector return port. In this case, the outflowing fuel impinges on the radial, lower, the control valve seat facing surfaces of the armature plate, whereby flow forces acting on the armature plate, which lead to an unwanted influence on the injection. These flow forces have a particularly strong effect in the known injector, since the control valve is designed as a valve pressure-balanced in the axial direction and only small magnetic forces are realized with the electromagnetic actuator, which in turn makes the armature plate comparatively easy by the flow forces occurring when the control valve is open can be adjusted.

Disclosure of the invention

Technical task

Of the The invention is therefore based on the object, an improved injector to propose, in which the of the with open control valve flowing in the direction of the injector return port Fuel caused, acting on the anchor plate and with it the switching behavior of the injector negatively influencing flow forces at least reduced.

Technical solution

These Task is with an injector with the features of the claim 1 solved. Advantageous developments of the invention are specified in the dependent claims. Fall within the scope of the invention also all combinations of at least two of in the description, the claims and / or the figures revealed Features.

Of the Invention is based on the idea that acting on the anchor plate Flow forces coming from that when open Control valve (servo valve) in the direction of the injector return port flowing fuel caused by known in jektoren be thereby minimized or preferably completely to avoid that for the anchor plate an independent Anchor space is provided which is separate from one of the anchor plate Ring element is separated from an annular space, the valve sleeve directly, or at a radial distance, d. H. indirectly, especially in her encloses lower, the control valve seat facing portion. Preferably, the ring member seals the, preferably axially adjacent to the annulus arranged armature space of the annulus at least so far from that at least a partial flow of the open control valve in the annular space flowing fuel, preferably a Main partial flow, especially the total fuel (tax amount) past the armature space in the direction of the injector return port is directed. This prevents that from the control valve seat lifted valve sleeve into the over the ring element fuel flowing from the armature space, at least a partial flow of this fuel, in the axial direction directly to the extending in the radial direction, the Control valve seat facing surfaces of the anchor plate over must flow to the injector return port, which acting on the anchor plate flow forces and resulting, unwanted valve sleeve vibrations at least largely avoided. The result resulting, optimized switching behavior of a concept according to The invention embodied injector is characterized in particular through minimized injection tolerances.

As mentioned above, the annular space preferably encloses the valve sleeve directly radially outside, in particular in a lower area facing the control valve seat. However, it is an embodiment feasible, in which the annular space, for example via an external guide element is separated from the valve sleeve. In this case, the annular space surrounds the valve sleeve with radial clearance, ie only indirectly. But even in such an embodiment flows with the control valve open fuel, possibly one, in particular annular, the valve sleeve immediately enclose end gap in the annulus, which is separated by means of the ring member of the armature space. From the annular space, the fuel flows (guided) from the ring element, in particular via at least one channel leading in the axial direction, to the injector return. In an injector designed according to the concept of the invention, the annular element thereby has the task of a baffle (guide element), with which fuel flowing into the annular space when the control valve is open is conducted radially outwards and optionally in the axial direction.

It is within the scope of the invention, the valve sleeve of the control valve to lead on its inner circumference and / or on its outer circumference. Furthermore, it is within the scope of the invention, within the valve sleeve to provide a guide pin, the one-piece with a valve body having the control valve seat of the control valve is trained. However, an embodiment is preferred in which provided within the valve sleeve, a pressure pin is as the valve body having the control valve seat Separate component is formed and extending in the axial direction at a spaced from the control valve seat member, preferably spring-assisted, supported or in one piece is formed with this component. This embodiment allows good accessibility of the control valve seat at its manufacture and a design of the valve sleeve guide and the control valve seat at different, separately from each other machinable components. The pressure pin comes in particular the Task to, the inner cross section of the valve sleeve in the axial Seal direction (upwards) and in the axial direction (after above) absorb compressive forces. It is in particular in a positionally fixed arrangement of the pressure pin, conceivable that this the valve sleeve in the axial direction on its inner circumference leads. Additionally or alternatively, a the Valve sleeve leading on its outer circumference Component to be provided, in which it, as later will be explained, for example, the ring element can act.

at the electromagnet arrangement is at least one electromagnet (Coil), which is preferably arranged in a holding body. The electromagnet arrangement together with the anchor plate, which is operatively connected to the valve sleeve, d. H. at this fixed or integrally formed with this, an electromagnetic actuator for adjusting the valve sleeve between its closed position, in which it rests against the control valve seat and an open position in which the control chamber is hydraulic connected to the injector return port, adjustable is.

From particular advantage is an embodiment of the injector, in which the ring element is not formed as a flat disc element is but in which the ring element at least two under one Angle, preferably at an angle of about 90 ° to each other having running, annular wall sections. Prefers at least one wall section extends in the axial direction and is coaxial with the valve sleeve, whereas at least one other wall section in a radial plane related lies on the valve sleeve.

Possibly can also be provided several wall sections, wherein two mutually adjacent wall sections together Include angle.

From Particular advantage is in terms of a space minimization of Injector an embodiment in which the ring element is arranged so that it extends axially from one area the control valve seat of the control valve and the armature plate in axial Direction, ie in the direction of injector return, until at least in a region radially outside the anchor plate, particularly preferably even in the axial direction over the Anchor plate also extends. It is advantageous if the Ring element both on its inner circumference and on its outer circumference the armature space at least substantially hydraulically from the axial of this spaced annular space separates.

Around the fuel past the armature space in the axial direction to the To be able to guide injector return connection, is an embodiment of advantage, wherein at least an axially leading channel is provided, seen in the axial direction between the annulus and the Injektorrücklaufanschluss is arranged. Preferred is an embodiment, in which this channel with radial distance to one, preferably Centrally arranged within the solenoid assembly, spring chamber is arranged. This spring space preferably takes the control closing spring, at least in sections, on, with the valve sleeve, especially when not energized electromagnet, back on their control valve seat is pressed. Especially preferred is an embodiment in which this control spring at the same time arranged inside the valve sleeve Pressure pin in the axial direction in the direction of the injector return port, For example, against a lid of the injector, spring-loaded, whereby the pressure pin a positionally stable position within the injector receives and if necessary to guide the valve sleeve can be used on its inner circumference.

With regard to the formation of the channel radially spaced from the spring chamber, there are various possibilities. Thus, it is conceivable, for example, in a holding body for the at least one electromagnet of the electromagnet assembly min at least provide a channel leading in the axial direction. Additionally or alternatively, the at least one channel, at least partially in a housing part of the injector, for example, as a hole, recess and / or cutout be formed. In addition, it is conceivable to form the channel, in particular sections, as an annular channel, which is preferably arranged radially between the holding body of the electromagnet arrangement and a housing part of the injector.

in the With regard to the realization of the seal of the anchor space or the definition of the ring element there are different implementation options. According to a first preferred embodiment the ring element is supported, preferably with an axial, annular end face on the electromagnet arrangement, preferably on a holding body of the electromagnet arrangement from.

additionally or alternatively, according to a second preferred Be provided embodiment that the ring element in axial direction against a component of the injector preferably against the electromagnet arrangement, or the holding body of the electromagnet arrangement, Federkraftbeaufschlagt, with a necessary for this, in particular formed as a helical spring, spring at one end to a (lower) Side of the ring element and at the other end to another injector component, preferably at the control valve seat having valve body supported.

alternative or preferably in addition to a Federkraftbeaufschlagung the ring member in the axial direction is an embodiment advantageous in which between the ring element, preferably an upper Section of the ring member, and a radially adjacent, preferably outer Component, in particular a housing part of the injector, a snap connection (latching connection) is realized. It is it is advantageous if the ring element, preferably exclusively the ring element or a wall portion of the ring element (and not the cooperating with this component) in the radial direction resilient is trained. Preferably, the ring element engages with at least a radially outer locking lug in a recess the Injektorbauteils, preferably the housing component one. To facilitate snapping the ring element in the Injektorbauteil it may be advantageous if the Injektorbauteil with one of his front side outgoing run-on slope is provided. It is within the scope of further education, several in the circumferential direction to provide spaced extensions, each with a Recess or a (single) designed as a circumferential annular groove Recess cooperate. It is also possible to use the extension form as an annular process.

As mentioned above, it is within the scope of the invention, the Valve sleeve on its outer circumference and / or on her Inner circumference lead. For guiding the valve sleeve on its outer periphery is an embodiment advantageous in which this external guide, at least partially, preferably completely, of the ring element, preferably of a, in particular cylindrical, sleeve-shaped section the ring element is taken over.

additionally or alternatively to the formation of the ring element as an outer guide element is an embodiment of advantage, wherein an outer guide element for guiding the valve sleeve as of a Control valve seat having valve body separate component is trained. If necessary, between the outside guide forming component and the ring member an annular seal for sealing the armature space are provided opposite the annulus. It is also an embodiment feasible, in the the outer guide for the valve sleeve integral with the valve body having Control valve seat is formed. Also in this case can if necessary between the component forming the outer guide, So in this case the valve body with control valve seat and the ring member is provided with a ring seal.

Around minimize magnetic stray effects and thereby the Increase the power of the electromagnetic actuator, is an embodiment of advantage in which the ring element, at least in sections, preferably completely a non-magnetic material is formed.

The Providing a valve sleeve allows training of the control valve as pressure-balanced in the closed state Valve. This can preferably be realized by a Sealing edge (seat edge) arranged on the inner circumference of the valve sleeve is, or adjacent to this, so that a pressure step on the valve sleeve, which cause an opening force on the valve sleeve would, is avoided.

Of particular advantage is an embodiment of the injector in which the injector return port (low-pressure port), in particular centrally, is arranged on a side facing away from the combustion chamber end face (cover) of the injector. Such an arrangement of the injector return port is inexpensive to produce and above all allows a simple mounting of the injector connections on the internal combustion engine. Furthermore, asymmetrical deformations are avoided by the injector internal pressure due to a substantially coaxial injector design with a return port arranged centrally on one end side. Preferably, the Injektorrücklaufanschluss is via a helical channel, the hydraulically with an except half of the spring chamber arranged channel is supplied with open control valve with fuel.

Brief description of the drawings

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments as well as from the drawings. These show in:

1 FIG. 2: a sectional partial view of an injector designed as a common-rail injector, in which an annular space is separated from an armature space by means of a ring element which is L-shaped in cross-section, FIG.

2 an embodiment of an injector in which the ring element serves as a guide element for guiding the valve sleeve on its outer circumference,

3 an embodiment of an injector in which a snap closure is realized between the ring element and an injector component,

4 an embodiment of the injector in which an outer guide for the valve sleeve is formed integrally with a valve body having the control valve seat,

5 an embodiment of the injector, in which an outer guide for the valve sleeve is formed as a separate component from the valve body having the control valve seat, and

6 An embodiment of the injector in which an annular seal is arranged between an outer guide for the valve sleeve and the annular element.

embodiments the invention

In The figures are the same components and components with the same Function marked with the same reference numerals.

In 1 is a section of an injector designed as a common rail injector 1 for injecting fuel into a combustion chamber of an internal combustion engine of a motor vehicle. A high pressure pump 2 Promotes fuel from a reservoir 3 in a high-pressure fuel storage 4 (Rail). In this fuel, especially diesel or gasoline, under high pressure, of about 2000 bar in this embodiment, stored. To the high-pressure fuel storage 4 is the injector 1 besides other, not shown, injectors via a supply line 5 connected. The supply line 5 flows into a pressure room 6 (High pressure area) of the injector 1 and flows from there during an injection process directly into the combustion chamber of the internal combustion engine. The injector 1 is via an injector return port 7 to a return line 8th connected to the reservoir 3 leads. Through the return line 8th may be a later to be explained control amount of fuel from the injector 1 to the reservoir 3 drain and be fed from there from the high pressure circuit again.

Within a housing part 9 is a one-piece injection valve element in this embodiment 10 , which can also be made in several parts, adjustable in the axial direction. In this case, the injection valve element 10 within a housing, not shown, with the housing part 9 guided strained nozzle body on its outer circumference. This nozzle body, not shown, is preferably by means of a union nut, also not shown with the housing part 9 braced.

The injection valve element 10 has at its (not shown) (lower) tip a closing surface, with which the injection valve element 10 in a tight contact with a formed within the nozzle body injection valve element seat (not shown) can be brought.

When the injection valve element 10 abuts against its injection valve element seat, that is, is in a closed position, the fuel outlet is blocked from a nozzle hole arrangement also not shown within the nozzle body. If, on the other hand, it is lifted from its injection valve element seat, fuel can escape from the pressure chamber 6 to flow past the injection valve element seat to the nozzle hole arrangement and there, substantially under the high pressure (rail pressure) standing, are injected into the combustion chamber.

From an upper section in the drawing plane 11 the injection valve element 10 and a lower, sleeve-shaped section in the plane of the drawing 12 a valve body 13 becomes a control chamber 14 bounded over a radially in the sleeve-shaped portion 12 of the valve body 13 running inlet throttle 15 with high-pressure fuel from the pressure chamber 6 is supplied. The sleeve-shaped section 12 with enclosed control chamber 14 is radially outwardly surrounded by fuel under high pressure, so that an annular guide gap 16 radially between the sleeve-shaped portion 12 and the injection valve element 10 is comparatively fuel-tight.

The control chamber 14 is about one, in the valve body 13 arranged drainage channel 17 with outlet throttle 18 hydrau lic with a valve chamber 19 connected radially outwardly of an axially adjustable valve sleeve 20 a pressure balanced in the axial direction in the closed state control valve 21 (Servo valve) is limited. The axial pressure balance of the control valve 21 is achieved in that the inner guide diameter D _{1 of} the valve sleeve 20 at least approximately the diameter D _{2 of} an annular sealing line (seat line) corresponds, by means of the valve sleeve 20 in the closed state at a control valve seat 22 rests against the valve body 13 is trained.

From the valve chamber 19 can then fuel in a low pressure area 23 of the injector 1 and from there to the injector return port 7 flow when the valve sleeve 20 in the embodiment shown in one piece with an anchor plate 24 is formed, from her to the valve body 20 trained control valve seat 22 is lifted, ie the control valve 21 is open. For adjusting the valve sleeve 20 in the plane of the drawing upwards is an electromagnet arrangement 25 provided, which is an electromagnet 26 (Coil), which in a holding body 27 is held. The electromagnet 26 acts with the anchor plate 24 Together, in an anchor room 28 is arranged, the armature space 28 via a ring element 29 from one in the axial direction adjacent to the armature space 28 arranged annulus 30 that the valve sleeve 20 in a plane lower in the drawing plane radially outwardly, is separated. Due to the one-piece design of anchor plate 24 and valve sleeve 20 or alternatively by a fixed connection between the anchor plate 24 and the valve sleeve 20 , lifts the valve sleeve 20 when energizing the solenoid assembly 25 from her to the valve body 13 arranged, formed in this embodiment as a flat seat, control valve seat 22 from. The flow cross sections of the inlet throttle 15 and the outlet throttle 18 are matched to one another in such a way that when the control valve is open 21 a net outflow of fuel (fuel tax amount) from the control chamber 14 over the valve chamber 19 in the low pressure area 23 , more precisely in the annulus 30 , the injector 1 and from there to the injector return port 7 and through the return line 8th in the reservoir 3 flows. This reduces the pressure in the control chamber 14 rapidly, causing the injection valve element 10 lifts off from its injection valve element seat, so that in the sequence fuel from the pressure chamber 6 can flow through the nozzle hole arrangement in the combustion chamber.

To end the injection process is the energization of the solenoid assembly 25 interrupted, causing the valve sleeve 20 by means of a at the anchor plate 24 supporting control closing spring 31 Mostly within one, centrally within the solenoid assembly 25 arranged, spring chamber 32 is received, in the drawing plane down on its control valve seat 22 is adjusted. The through the inlet throttle 15 in the control chamber 14 inflowing fuel ensures a rapid rise in pressure in the control chamber 14 and thus for a force acting on the injection valve element closing force. The resulting closing movement of the injection valve element 10 is supported by a closing spring, not shown, which is located at one end on a circumferential collar of the injection valve element 10 and at the other end to a lower, not shown end face of the valve body 13 supported.

To prevent the open control valve 21 from the valve chamber 19 escaping fuel (fuel tax amount), or the majority of this fuel, in the axial direction directly to the anchor plate 24 past or through recesses through it to the injector return port 7 flows is the already mentioned ring element 29 provided that the annulus 30 that the valve sleeve 20 in the area of the control valve seat 22 radially outwardly surrounds one of the anchor plate 24 receiving area (anchor space 24 ) is at least largely decoupled hydraulically. In other words, by providing the ring element 29 an anchor room 28 limited both in the axial direction downwards, as well as in the radial direction outwards, in which the anchor plate 24 is included. As an additional limitation of the anchor space 28 radially inside the valve sleeve 20 and in the axial direction upward, the solenoid assembly 25 , The anchor room 28 goes in the axial direction in the plane of the drawing upwards into the center within the electromagnet assembly 25 arranged spring chamber 32 above.

In the embodiment shown, the ring element 29 seen in cross-section substantially L-shaped and has two mutually perpendicular wall sections 33 . 34 on, over an intermediate wall section 35 , each at a 45 ° angle to the wall sections 33 . 34 is arranged, are integrally connected to each other. The ring element 29 , which is formed to prevent magnetic stray influences from a non-magnetically conductive material, is by means of a spring 36 , which at one end to the valve body 13 and at the other end to a lower in the drawing plane end face of the wall portion 33 of the ring element 29 supported, in axia ler direction in the plane of the drawing up against the holding body 27 the electromagnet assembly 25 pressed and lies there sealingly at a contact point 37 at. Another seal of the anchor room 28 is from the ring element 29 at its radially inner end, ie formed on its inner circumference. There is between the annulus 29 and the valve sleeve 20 in one area axially in the plane below the anchor plate 24 a sealing gap 38 formed, which is sized so large that on the one hand, the adjustment of the valve sleeve 20 is not obstructed in the axial direction during operation, but is so small that it has a possible Absteuerstoß with opening control valve 21 still sufficiently tight.

With open control valve 21 the fuel (tax amount) first flows into the annulus 30 and there in the radial direction to the outside through a radial channel 39 (Ring channel), in the drawing plane in the axial direction upward from the wall portion 33 of the ring element 29 and in the axial direction down from a holding element 40 is limited, which with an internal thread of the housing part 9 is bolted and the valve body 13 with the housing part 9 braced. The radial channel thus formed 39 goes over into several, pointing in the axial direction channels 41 of which only one is shown in the section plane. This channel 41 is outside of the holding body in the embodiment shown 27 formed as a cutout and leads seen in the axial direction to the top of the plane of the drawing in the plane of the electromagnet assembly 25 , There is in a trained as a lid housing part 42 a pocket 43 introduced via which the fuel in the radial direction inwards to a sloping channel 44 can flow, the inside of the housing cover 42 is arranged and directly to the centric injector return port 7 leads. It is conceivable, a plurality of circumferentially spaced inclined channels 44 provided. As in particular from 1 shows, which is a lid forming housing part 42 with a union nut 45 (Clamping nut) against the housing part 9 , or against one between the housing part 42 and the housing part 9 arranged ring seal 46 braced.

In the valve sleeve 20 protrudes a pressure pin 47 into it, the valve chamber 19 in the plane of the drawing seals axially above. The pressure pin 47 extends in the axial direction in the spring chamber 32 into and leaning against a plate 48 from. Alternatively, the pressure pin 47 integral with the plate 48 are formed, which in turn against the serving as a lid housing part 42 by means of the control closing spring 31 is spring-loaded. Alternatively, an immediate support of the pressure pin 47 on the housing component 42 or even a one-piece training with this conceivable.

In the following, the embodiments according to the 2 to 6 explained. These correspond in their basic structure substantially to the in 1 shown injector basic structure. In order to avoid repetitions, therefore, the following will essentially be based only on differences from the exemplary embodiment 1 received. Concerning the similarities is on the previous figure description as well as on 1 directed.

At the in 2 shown injector 1 has the ring element 29 an additional sleeve-shaped wall section 49 on top of the valve sleeve 20 on its inner circumference leads. The ring element 29 extending in the axial direction on the solenoid assembly 25 supports and is spring-loaded against this, so in addition to the delineation of the anchor space 28 from the annulus 29 the function as external guide for the valve sleeve 20 , With such a construction, it must be ensured that, via appropriate component accuracies and tolerances, one for the control valve seat 22 sufficient perpendicularity of the outer guide to the control valve seat 22 is ensured. Because the ring element 29 in the embodiment shown, an external guide function for the valve sleeve 20 has, the tightness of a radially between the valve sleeve 20 and the sleeve-shaped wall portion 49 formed gap 50 greater than the tightness of the sealing gap 38 according to 1 ,

3 shows an injector 1 with a further variant of the ring element 29 , Between the ring element 29 or in the drawing plane upper axial end of the ring element 29 and the housing part 42 , or a sleeve section 51 of the housing part 42 , a snap connection is realized. This is in the sleeve section 51 an annular groove on its inner circumference 52 formed in the plurality of radially facing in the circumferential direction of one of the spaced annular extensions 53 on the wall section 35 are arranged, are included. By providing the snap connection formed in this way, alternatively with an annular groove 52 in the ring element 29 and one example as an annular process 53 in the sleeve section 51 can be formed, it is achieved that the ring element 29 , which in the axial direction upward by means of the spring 36 Federkraftbeaufschlagt is not directly to the solenoid assembly 25 is applied. As a result, the electromagnet arrangement 25 also have a lower component strength.

The channel 41 that as in the previously described. Embodiment with radial distance to the spring chamber 32 is arranged, does not open into a pocket, but is at a distance from the solenoid assembly 25 arranged and opens into a sloping channel 44 directly to the injector return port 7 leads. In the area of the transition between the canal 41 to the inclined channel 44 is between the housing part 42 and the housing part 9 a ring seal 46 added.

4 shows an embodiment of the injector 1 in which an outside guide 54 for the valve sleeve se 20 from the control valve seat 22 having valve body 13 , or a sleeve-shaped portion of the valve body 13 , is formed. In this embodiment, the annulus encloses 30 Although the valve sleeve 20 in an axially lower region radially outward, but not directly. The annulus 30 from the anchor room 28 by means of the ring element 29 is separated from the valve sleeve 20 separated by means of the outer guide 54 or the valve body 13 , The annulus 30 However, it is about a plurality of circumferentially spaced connection channels 55 acting as radial passages in the valve body 13 are formed, hydraulically with an annular space 56 connected to the valve sleeve 20 immediately radially encloses in a lower area in the drawing plane. In the embodiment shown, the ring element 29 from the spring 36 against the solenoid assembly 25 spring force. With his on the wall section 33 trained inner circumference is the ring element 29 comparatively tight radially outside on the outer guide 54 at.

In 5 is an embodiment of the injector 1 shown in which the outer guide 54 for the valve sleeve 20 as from the valve body 13 separate component 59 is executed. The exterior guide 54 is formed in this case in cross-section L-shaped. This embodiment also has, like the embodiment according to FIG 4 , the advantage of having a friction (contact) between the ring element 29 and the valve sleeve 20 avoided in any case. Manufacturing technology, the embodiment shown in relation to the embodiment according to 4 advantageous because the outer guide 54 for the valve sleeve 20 and the control valve seat 22 formed on different components, ie can be manufactured and edited. How out 5 can be seen, the fuel flows with the control valve open 21 in the annular space 56 and flows from there via the radially leading connection channels 55 in the annulus 30 and from there across the canal 41 and the inclined channel 44 to the injector return port 7 , The ring element 29 lies close to its inner circumference on the outer circumference of the outer guide 54 forming component 59 in an axially upper area. The trained as a coil spring spring 36 with which the ring element 29 against the solenoid assembly 25 Federkraftbeaufschlagt is based in the drawing level at the bottom of the outer guide 54 forming component.

The embodiment according to 6 essentially corresponds to the embodiment according to 5 with the difference that between the ring element 29 and the outside guide 54 for the valve sleeve 20 forming component 59 a ring seal 57 is arranged in a circumferential groove 58 that are radially on the outside of the component 59 is arranged, is included. Other sealing geometries than the O-ring shown are of course alternatively feasible. Furthermore, it is possible the ring seal 57 , additionally or alternatively, in a circumferential groove 58 in the ring element 29 to arrange or possibly even axially between the ring element 29 and the component 59 , Beside the wall sections 33 . 35 and 34 has the ring element 29 in the embodiment shown in comparison to the embodiment according to 2 shortened sleeve-shaped wall section 49 on, with which the ring element 29 on the outer circumference of the outer guide 54 forming component 59 is applied.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• - EP 1612403 A1 [0002]

Claims (13)

Injector for injecting fuel into the combustion chamber of an internal combustion engine, in particular a common rail injector, having an injection valve element ( 10 ), which depends on the pressure in a control chamber ( 14 ) is adjustable between a closed position and an open position in the axial direction, wherein the control chamber ( 14 ) by means of one, an adjustable valve sleeve ( 20 ), control valve ( 21 ) with an annulus ( 30 ), which is hydraulically connected to an injector return port ( 7 ), wherein the valve sleeve ( 20 ) for cooperation with an electromagnet arrangement ( 25 ) with an anchor plate ( 24 ), characterized in that adjacent to the annulus ( 30 ) via one of the anchor plate ( 24 ) separate ring element ( 29 ), from the annulus ( 30 ), the anchor plate ( 24 ) receiving armature space ( 28 ) is arranged. Injector according to claim 1, characterized in that the ring element ( 29 ) at least two at an angle, preferably at an angle of 90 °, mutually extending, annular wall sections. ( 33 . 34 . 49 ) having. Injector according to one of claims 1 or 2, characterized in that the ring element ( 29 ) from an area axially between a control valve seat ( 22 ) and the anchor plate ( 24 ) in the axial direction to at least in a region radially outside of the anchor plate ( 24 ). Injector according to one of the preceding claims, characterized in that within an electromagnet arrangement ( 25 ) a spring chamber ( 32 ) for a control closing spring ( 31 ) of the control valve ( 21 ) is arranged, and that the ring element ( 29 ) is arranged such that it the fuel in the direction of at least one in the radial direction to the spring chamber ( 32 ), axially in the direction of the injector return port ( 7 leading channel ( 41 ). Injector according to claim 4, characterized in that the channel ( 41 ) at least in sections in a housing part ( 42 ) of the injector ( 1 ) and / or in a holding body ( 27 ) for the at least one electromagnet ( 26 ) of the electromagnet arrangement ( 25 ) and / or radially between the holding body ( 27 ) and the housing part ( 42 ) and / or between two housing parts ( 9 . 42 ) is formed. Injector according to one of the preceding claims, characterized in that the ring element ( 29 ) in the axial direction on the electromagnet arrangement ( 25 ) is supported. Injector according to one of the preceding claims, characterized in that the ring element ( 29 ) in the axial direction against a component of the injector ( 1 ), preferably against the electromagnet arrangement ( 25 ) is spring-loaded. Injector according to one of the preceding claims, characterized in that the ring element ( 29 ) by means of a snap connection to a radially adjacent component, preferably a housing part ( 42 ). Injector according to one of the preceding claims, characterized in that the ring element ( 29 ) with its inner circumference, in particular with a sleeve-shaped wall section ( 49 ), the valve sleeve ( 20 ) leads on its outer periphery. Injector according to one of the preceding claims, characterized in that an external guide ( 54 ) of the valve sleeve ( 20 ) than from a control valve seat ( 22 ) having valve body ( 13 ) separate component ( 59 ) is formed, and that preferably between the component ( 59 ) and the ring element ( 29 ) a ring seal ( 46 ) is arranged. Injector according to one of the preceding claims, characterized in that the ring element ( 29 ) is formed of a non-magnetic material. Injector according to one of the preceding claims, characterized in that the control valve ( 21 ) is formed in the closed state as a pressure-balanced valve in the axial direction. Injector according to one of the preceding claims, characterized in that the injector return port ( 7 ), in particular centrically, on an end face of the injector ( 1 ) is arranged.