WO2018091212A1

WO2018091212A1 - Injection valve for internal combustion engines

Info

Publication number: WO2018091212A1
Application number: PCT/EP2017/076270
Authority: WO
Inventors: Tilo STARKERT; Franz Thoemmes; Laurent Jeannel
Original assignee: Robert Bosch Gmbh
Priority date: 2016-11-17
Filing date: 2017-10-16
Publication date: 2018-05-24
Also published as: DE102016222606A1

Abstract

For an injection valve (1) for internal combustion engines, having a valve longitudinal axis (2), having a valve seat body (16) which has a fixed valve seat (29), having a valve closing body (7) which interacts with the valve seat (29) and can be moved axially along the valve longitudinal axis (2), and having a perforated disc (23) which is arranged downstream of the valve seat body (16) and has at least one spray hole pair comprising two spray holes (24) with in each case one spray hole axis (S), wherein the spray hole axes (S) of the two spray holes (24) of a spray hole pair run in a convergent manner towards one another in order to achieve a jet collision, it is proposed that an incident flow cavity (26) is provided between an outlet opening (27) of the valve seat body (16) and the perforated disc (23), wherein the incident flow cavity (26) has a cavity diameter (D26) perpendicularly with respect to the valve longitudinal axis (2), which cavity diameter (D26) is greater than an outlet diameter (D27) of the outlet opening (27) perpendicularly with respect to the valve longitudinal axis (2).

Description

description

title

Injection valve for internal combustion engines

State of the art

The invention relates to an injection valve for internal combustion engines with the features of the preamble of independent claim 1. It is known that in injectors for internal combustion engines for the

Spray treatment in the low-pressure range, the colliding of two jets is applied after the spray hole emerges. For example, DE 10 2006 041 476 A1 shows an injection valve with a plurality of spray-hole pairs, each consisting of two spray-holes, which converge to one another to achieve a jet collision.

Furthermore, injection valves are known in which a perforated disc with spray holes is provided downstream of the valve seat. It is between an outlet opening in the valve seat body and the perforated disc a Anströmhohlraum with larger

Diameter formed as the diameter of the outlet opening, wherein the

Spray holes with the outlet opening in the valve seat body in the immediate

Flow connection and thereby from an upper limit of the

Anströmhohlraums are covered. In other words, there is a complete radial offset from the outlet opening defining the inlet of the Anströmhohlraums in the valve seat body and the spray holes. Thus, in such injection valves, an S-shaped flow pattern of the fuel, the one

sprouting measure, be trained. Such a thing

Injection valve is known for example from DE 10 2004 049 278 A1.

Disclosure of the invention According to the invention, an injection valve for internal combustion engines, with a

Valve longitudinal axis, with a fixed valve seat having valve seat body, with a valve seat cooperating with the valve seat, which is axially movable along the valve longitudinal axis, and proposed with a downstream of the valve seat body perforated disc with at least one injection hole pair of two spike holes, each with a spray hole axis. The spray hole axes of the two spray holes of a

Spray hole pairs converge to achieve a jet collision.

According to the invention, an inflow cavity is provided between an outlet opening of the valve seat body and the perforated disk, wherein the inflow cavity has a cavity diameter perpendicular to the valve longitudinal axis, which is larger than an outlet diameter of the outlet opening perpendicular to the valve longitudinal axis.

Advantages of the invention

It is known that injectors for internal combustion engines for the

Spray preparation in the low-pressure range colliding two beams after

Spray hole outlet is applied. The colliding of the two beams after hole leakage typically occurs between two primary laminar beams. The laminar primary rays are on the one hand by a large ratio of spray hole length to

Spray hole diameter and on the other generated by a direct flow of the injection holes. After the collision the rays break up. The beam breakup after the collision then takes place perpendicular to a beam plane defined by the colliding beams. In this way, so-called flat sprays are produced.

In the injection valve according to the invention is between the outlet opening of the

Valve body and the perforated disc provided a Anströmhohlraum, wherein the

Anströmhohlraum has a cavity diameter which is greater than one

Outlet diameter of the outlet opening. Instead of the direct flow of the

Spray holes before the jet collision is achieved by a valve seat with a Anströmhohlraum that the flow is deflected in front of the spray holes. The deflection of the flow has the consequence that the rays already have turbulent fractions before the collision. As the degree of turbulence increases, the advantage changes

Spray form. Whereas, in the collision of laminar primary beams, a beam breakup takes place perpendicular to a beam plane defined by the two collided beams, the beam can be generated by the injection valve according to the invention Primary rays with strongly turbulent parts also break up in the jet plane. Such flat sprays, which break up in the jet plane, have a higher robustness compared to manufacturing tolerances as a function of the spray hole position. By adjusting the degree of turbulence by the geometry of the valve seat, the perforated disc, the Anströmhohlraums and the injection holes, it is also possible to produce a round spray with this Zerstäubungsmethode. Thus, an advantageously homogeneous spray can be produced in various forms by the injection valve according to the invention. By varying the geometry, the degree of turbulence of the primary rays can be advantageously varied and, at the same time, the shape of the spray can advantageously be varied.

Further advantageous embodiments and modifications of the invention are made possible by the features specified in the subclaims. In a particularly advantageous embodiment, the quotient of the cavity diameter of the Anströmhohlraums and the exit diameter of the outlet opening between 1, 5 and 5. In such a ratio of

Cavity diameter of the Anströmhohlraums and exit diameter of

Outlet opening can by the thus generated S-shaped guide of the

medium to be injected from the outlet opening in the An ström hollow cavities to the spray holes for generating a desired shape of the spray particularly advantageous primary rays are generated with turbulent proportions.

It also proves to be an advantage if the quotient of a distance of the two injection holes forming a spray hole pair and the exit diameter between 0.5 and 5. By such a ratio between the distance of the two

Spray hole pair forming injection holes and the outlet diameter, the flow in the Anströmungshohlraum can be advantageously deflected and thus turbulent portions are generated in the exiting the spray holes primary beams, so that after collision of the turbulent primary radiation advantageously homogeneous spray can be generated and a desired spray shape can be generated ,

Particularly advantageous is the quotient of a hole length of the injection holes and a hole diameter of the injection holes between 0.5 and 5, which can be generated for generating the spray shape particularly advantageous primary rays. A further improvement in the homogeneity and the shape of the spray results when the quotient of the hole length of the injection holes and a cavity height of the

Anströmhohlraums is between 0.25 and 5. This area proves to be particularly advantageous in terms of flow dynamics in order to produce the desired spray shape.

Particularly advantageous is a hole inclination, which is the angle between the

Valve longitudinal axis and a spray hole axis, between 10 degrees and 60 degrees. In this way, an advantageous good and homogeneous spray can be produced at a desired height, at a desired distance from the perforated disc and in the desired shape.

BRIEF DESCRIPTION OF THE DRAWINGS Exemplary embodiments of the invention are illustrated in the drawing and will be explained in more detail in the following description. Show it

1 schematically shows a profile of the medium to be injected for spray generation in an injection valve according to the prior art,

2 shows a cross section through the primary beams shown in Fig. 1,

3 shows a cross section through the spray shown in Fig. 1,

4 schematically shows a profile of the medium to be injected for generating spray in an injection valve according to the invention,

5 shows a cross section through the primary beams shown in Fig. 4,

6 shows a cross section through the spray shown in Fig. 4,

Fig. 7 is a partially illustrated embodiment of the invention

Injector,

8 shows a second partially illustrated embodiment of the injection valve according to the invention,

9 shows an enlarged detail of the embodiment of the injection valve according to the invention shown in FIG. 7

Fig. 10 shows a third partially illustrated embodiment of the injection valve according to the invention. Embodiments of the invention

The injection valve 1 according to the invention is intended for injection or metering of a medium 40 to be injected, for example for internal combustion engines.

For example, the injection valve 1 may be provided as a fuel injection valve for injecting fuel, for example in a suction pipe of the internal combustion engine. However, the injection valve according to the invention can also, for example, for injection of water as medium to be injected, for example in a suction pipe of

Internal combustion engine be provided. The injection valve according to the invention can also be used, for example, in the exhaust aftertreatment in diesel vehicles, for example for metering a urea water solution (AdBlue) as the medium to be injected into the exhaust gas line.

Fig. 1 shows schematically a course of a medium to be injected

Sprayerzeugung in an injection valve according to the prior art, in which for the spray treatment in the low-pressure region, the colliding of two primary jets 41 after exiting spray holes 24 is applied. FIG. 1 shows a coordinate system which shows an x-direction x, a z-direction z and a y-direction y. The x-direction x and the z-direction z lie in the plane of the drawing and are perpendicular to one another. The y-direction y is perpendicular to the x-direction x and the z-direction z and points into the plane of the drawing. In Fig. 1 is to illustrate the course of the

to be injected medium for spraying a valve seat body 16 of a

Injection valve and attached to the valve seat body 16 perforated disk 23 is shown. An interior space 28 formed in the valve seat body 16 is filled with the medium 40 to be injected, for example with fuel, and is delimited by the perforated disc 23 to the side to which the medium 40 to be injected is sprayed. In the perforated disc 23, a spray hole pair of two spray holes 24, each with a spray hole axis S is formed. The injection hole axes S converge to each other to achieve a jet collision. Thus, two primary jets 41 are generated from the medium to be injected 40 by the two spray holes forming the injection hole pair 24 such that they meet in a collision point 42 and collide and then a spray 43 is generated. An intersection of the spray hole axes S defines the collision point 42. Due to the geometry shown in FIG

Valve seat body 16 and the perforated disc 23 and by a direct flow of the injection holes 24 laminar primary beams 41 are generated, which are shown in Fig. 2 as a cross section in the xy plane. After the collision in the collision point 42 break the Primary beams 41 on. The beam breakup after the collision takes place in the collision of two laminar primary beams 41 then perpendicular to a defined by the colliding rays beam plane. In this way, so-called flat sprays are produced. Fig. 3 shows such a flat spray 43 in a cross section through the xy plane. In the context of the present application, the plane referred to as plane is the plane in which the two spray-hole axes S of the two injection-holes 24 forming a spray-hole pair lie. The ray plane corresponds in the figures to the xz plane.

Fig. 4 shows schematically a course of the medium to be injected

Spray generation in an injection valve according to the invention. In Fig. 4 is a

Coordinate system shown, which shows an x-direction x, a z-direction z and a y-direction y. The x-direction x and the z-direction z lie in the plane of the drawing and are perpendicular to one another. The y-direction y is perpendicular to the x-direction x and the z-direction z and points into the plane of the drawing. FIG. 4 shows schematically a valve seat body 16 with a perforated disc 23 and a schematic profile of the medium to be injected for spray generation in the case of an inventive device

Injector. In the perforated disk 23 arranged downstream of the valve seat body 16, a spray hole pair of two spray holes 24, each having a spray hole axis S, are formed. The spray hole axes S of the two spray holes 24 of the spray hole pair converge to achieve a beam collision, so that two of the two spray holes 24 outgoing primary beams 41 meet at a collision point 42 and collide at the collision point 42 to produce a spray 43. As shown schematically in Fig. 4, an inflow cavity 26 is provided in the injection valve according to the invention between an outlet opening 27 of the valve seat body 16 and the perforated disc 23, wherein the Anströmhohlraum 26 a

Has cavity diameter D26, which is greater than the outlet diameter D27 of the outlet opening 27 (Figure 4). Instead of the direct flow of the injection holes 24 through the medium to be injected 40 before the jet collision, as in the prior art

1), is achieved by a valve seat body 16 with such a Anströmhohlraum 26, that the flow is deflected in front of the spray holes 24. The deflection of the flow of the medium 40 to be injected from the outlet opening 27 via the Anströmhohlraum 26 to the spray holes 24 has the consequence that the primary rays 41 already before the collision turbulent shares, as shown schematically in Fig. 5 by a cross section through the primary rays 41 is. With the increase of Degree of turbulence advantageously changes the spray shape. While in the case of the primary beams 41 with a low turbulence fraction, a jet breakup takes place perpendicularly to a beam plane defined by the two collided beams, ie in the yz plane (FIGS. 1, 3), the jet breaks with the highly turbulent generated by the injection valve according to the invention Primary rays 41 in the beam plane, ie in the xz plane on. Such flat sprays 43, which break up in the jet plane, ie in the xz plane, have a higher robustness compared with production tolerances as a function of the spray-hole position. By adjusting the degree of turbulence by the geometry of the valve seat body 16, the perforated disc 23, the Anströmhohlraums 26 and the injection holes 24, it is also possible also a round spray 43 with this

To produce atomization method. Thus, by the inventive

Injector 1, the turbulent portions of the primary beams 41 generated by deflection of the flow and the subsequent collision of the primary jets 41 an advantageous homogeneous spray 43 are produced in various forms. The various forms of spray 43 that can be generated by the injection valve 1 according to the invention are shown schematically in FIG. With increasing degree of turbulence, the shape of the spray 43 can advantageously be of a flat shape extending in the yz-plane (Fig. 6, left), to a round shape (Fig. 6, center) to a flat in the xz- Plane extending form (Figure 6, right) are generated. The shape can be determined by the geometries of the valve seat body 16, the perforated disc 23 and the

Anströmhohlraums 26 are determined.

Thus, for the shapes of the spray 43 shown in FIG. 6 and for the variation between the illustrated shapes of the spray 43, it proves to be advantageous if the quotient of the cavity diameter D26 of the onflow cavity 26 and the outlet diameter D27 of the outlet opening between 1, 5 and 5 is. Further advantageously, the quotient of a distance B24 of the two injection holes forming a spray hole pair 24 and the outlet diameter D27 is between 0.5 and 5. Moreover, it is advantageous if the quotient of a hole length L24 of

Spray holes 24 and a hole diameter D24 of the injection holes 24 is between 0.5 and 5 and / or the quotient of the hole length L24 of the injection holes 24 and a cavity height H26 of the Anströmhohlraums 26 is between 0.25 and 5. Furthermore, a hole inclination LN, which is between 10 degrees and 60 degrees, proves to be advantageous, wherein the hole inclination denotes the angle between the valve longitudinal axis 2 and a spray hole axis S. FIG. 7 shows an exemplary embodiment of the injection valve 1 according to the invention. It is, for example, a valve in the form of an injection valve for

spark-ignited spark-ignition internal combustion engines, an injection valve for injecting water, an injection valve for injecting a urea water solution in an exhaust line or any other injection valve, which is intended to inject a medium to be injected dosed. The injection valve 1 is shown partially and schematically in FIG. The injection valve 1 has, for example, an only schematically indicated, forming a part of the valve seat housing, for example tubular valve seat carrier 35, in concentric with a

Valve longitudinal axis 2 a longitudinal opening 3 is formed. In the longitudinal opening 3, for example, a tubular valve needle 5 is arranged. The valve needle 5 is, for example, at its downstream end 6 with a spherical, for example

Valve closing body 7 firmly connected. The valve closing body 7, along the

Valve longitudinal axis 2 is axially movable, cooperates with a valve seat 29. The valve seat 29 is formed, for example, on a valve seat body 16. At one

Extent of the valve closing body 7 are, for example, five flats 8 for

Preflow of the injected medium s provided.

The actuation of the injection valve can in a known manner, for example

electromagnetically. For axial movement of the valve needle 5 and thus to open against the spring force of a return spring, not shown, or for

Closing the injection valve is a schematically indicated magnetic circuit with a magnetic coil 10, an anchor 1 1 and a core 12. The armature 1 1 is

For example, with the valve closing body 7 facing away from the end of the valve needle 5, for example, connected by a weld and aligned with the core 12.

In a downstream end of the valve seat carrier 35, a valve seat body 16 is tightly mounted, for example, by welding. On its lower end face 17 facing away from the valve closing body 7, for example, a perforated disk 23 with injection holes 24 formed in the perforated disk 23 can be provided. The perforated disc 23 is arranged downstream of the valve seat body 16. The valve seat body 16 may be executed, for example, stepped at its lower end side. Thus, in the middle region around the valve longitudinal axis 2, for example, a recess 20 may be provided, in which a flat, for example single-layer perforated disk 23 may be introduced.

Upstream of the injection holes 24 of the perforated disc 23, a Anströmhohlraum 26 is provided in the valve seat body 16, via which the individual injection holes 24 flows become. The Anströmhohlraum 26 has a cavity diameter D26 perpendicular to the valve longitudinal axis 2, which is greater than an exit diameter D27 of

Outlet opening 27 perpendicular to the valve longitudinal axis 2, from which the medium to be injected flows into the Anströmhohlraum 26 and ultimately into the injection holes 24. The valve seat body 16 is for example rotationally symmetrical to

Valve longitudinal axis 2 formed.

The connection of valve seat body 16 and perforated disc 23 takes place, for example, by a circumferential and dense weld 25 which is placed outside the Anströmhohlraums 26.

The insertion depth of the valve seat body 16 with the perforated disc 23 in the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 at non-energized solenoid 10 by the system of the valve closing body 7 at a downstream conically tapered valve seat surface 29 of the valve seat body 16 is set. The other end position of the valve needle 5 is set at energized solenoid 10, for example, by the plant of the armature 1 1 to the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke. The injection holes 24 of the perforated disc 23 are in direct flow communication with the Anströmhohlraum 26 and are thereby covered by the upper boundary of the Anströmhohlraums 26. In other words, there is a complete offset in a direction perpendicular to the valve longitudinal axis 2 of the outlet opening 27 and the spray holes 24 defining the inlet of the Anströmhohlraums 26. Due to the example radial offset of the injection holes 24 with respect to the outlet opening 27 results in an S-shaped flow pattern of the medium, here, for example, the medium to be injected. Due to the so-called S-impact in front of and within the perforated disc 23 with several strong flow deflections, the flow is imparted an atomization-promoting turbulence. Of the

Velocity gradient across the flow is thereby particularly pronounced. It is an expression of the change in the velocity across the stream, with the velocity in the middle of the flow much greater than that in the vicinity of the walls. The increased shear stresses in the fluid resulting from the speed differences favor the turbulence of the primary jets 41 of the medium 40 to be injected after the spray holes 24. The degree of this turbulence can advantageously be determined by the geometries of the onflow cavity 26, the outlet opening 27 and the perforated disc 23 and their ratios to one another are varied, and thus, as shown by the schematic illustrations in FIGS. 3 to 6, the shape of the spray can advantageously be varied. In a second exemplary embodiment of the injection valve according to the invention (FIG. 8), in contrast to the first exemplary embodiment illustrated in FIG. 7, the perforated disc 23 is designed, for example, to be taped. The valve seat body 16 may, as also shown in Fig. 8, in contrast to the first embodiment shown in Fig. 7 flat on its lower end face, and be formed without gradation.

FIG. 9 shows an enlarged detail of the first shown in FIG

Embodiment of the injection valve 1 according to the invention, in which the

inventive geometry of the valve seat body 16 and the perforated disc 23 is shown.

In this first embodiment, the quotient of the

Cavity diameter D26 of the Anströmhohlraums 26 and the outlet diameter D27 of the outlet opening 27 between 1, 5 and 5. The Anströmhohlraum 26 is

For example, the spatter holes 24 bounded by a boundary surface 30 of the valve seat body 16 opposite. In this embodiment, the

Limiting surface 30 of the valve seat body 16 is formed flat and perpendicular to the valve longitudinal axis 2 in a plane. On the boundary surface 30th

opposite side of the Anströmhohlraum 26 is limited by the perforated disc 23. In respect to the valve longitudinal axis 2 radial direction of the Anströmhohlraum 26 is in this embodiment by a cylindrical concentric with

Valve longitudinal axis 2 formed on the valve seat body 16 outer wall 31 limited.

The perforated disc 23 is formed in this embodiment as a flat disc of uniform thickness with one of the boundary surface 30 of the valve seat body 16 facing flat top 36 of the perforated disc 23 facing away from the top 36 of the perforated disc 23 underside 37 of the perforated disc 23. The top 36 extends in this embodiment parallel to the bottom 37 and at the same time parallel to the boundary surface 30 of the valve seat body 16. In the perforated disc 23 injection holes 24 are formed, which extend from the top 36 of the perforated disc 23 to the bottom 37 of the perforated disc 23. The injection holes 24 For example, they may be fabricated by UKP lasers, stamping, drilling, micromilling, eroding, or other suitable manufacturing techniques. In the embodiment, a spray hole pair with two spray holes 24, each with a spray hole axis S is shown. The injection hole axes S of the spray hole pair forming injection holes 24 extend to achieve a beam collision convergent to each other. Thus, the primary jets 41, which are not shown in FIGS. 7 to 10 and are located downstream of the injection holes 24, collide from the medium to be injected at a collision point 42 and form a spray 43 after the collision at the collision point 42. The injection holes 24 have a

Hole inclination LN on. The hole inclination LN denotes the angle between the

Valve longitudinal axis 2 and a spray hole axis S. In this embodiment, the hole inclination between 10 ° and 60 °. In this exemplary embodiment, the two injection holes 24 forming a spray hole pair have the same hole inclination LN. The

Orifice plate 23 is formed, for example, symmetrically with respect to at least one plane passing through the valve longitudinal axis 2. In this embodiment, the injection holes 24 are formed as cylindrical channels, the injection hole axes S forming the axes of the cylinder. Thus, the injection holes 24 in a cross section perpendicular to the injection hole axis S have a circular shape. But you can also have other suitable forms of cross-sections such as oval or polygonal shapes.

Furthermore, the quotient of a distance B24 of the two injection holes forming a spray hole pair 24 and the outlet diameter D27 of the outlet opening 27 between 0.5 and 5. The injection holes 24 each have a hole length L24 and a hole diameter D24. The hole length corresponds in this embodiment, the distance between the top 36 of the perforated disc 24 and the bottom 37 of the perforated disc 24 and is measured in the direction of the valve longitudinal axis 2. Of the

Hole diameter D24 is measured perpendicular to the injection hole axis S. The quotient of the hole length L24 of the injection holes 24 and the hole diameter de 24 of the injection holes 24 in this example is between 0, 5 and 5. The Anströmhohlraum 26 has a cavity height H26. In this embodiment, the quotient of the hole length L24 of the injection holes 24 and the cavity height H26 of

Anströmhohlraums 26 between 0.5 and 5. The Anströmhohlraum 26 is for example cylindrical, wherein the valve longitudinal axis 2 of the

Injector 1, the longitudinal axis of the cylindrical Anströmhohlraums 26 forms. In Fig. 10 is a third embodiment of the invention

Embodiment shown. In contrast to the second exemplary embodiment of the injection valve shown in FIG. 9, in the third exemplary embodiment the boundary surface 30 is not formed in one plane. In the third

Embodiment, the boundary surface 30 is formed such that a circular cross-section of the Anströmhohlraums 26 in a plane perpendicular to the longitudinal axis of the valve 2, starting from the outlet opening 17 to the perforated disc 23 towards continuously increased in a range. The boundary surface 30 is thus in this embodiment on a cone. The Anströmhohlraum 26 is formed here, for example, funnel-shaped. The cavity diameter H 26 denotes the largest diameter of the Anströmhohlraums 26 perpendicular to the longitudinal axis of the valve 2 and thus the diameter of the largest circular cross section of the Anströmhohlraums 26 perpendicular to the valve longitudinal axis 2. In a direction perpendicular to the longitudinal axis of the valve 2 considered the Anströmhohlraum 26 starting from the Outlet opening 17 to the spray holes 24 towards closer. As a result, the turbulence can advantageously be selectively increased in this embodiment. As shown in FIG. 10, the boundary surface 30 includes an angle BN in the cross section with a plane perpendicular to the valve longitudinal axis 2. The angle BN can advantageously be between 0 ° and 45 °. Of course, further embodiments and hybrid forms of the illustrated embodiments are possible.

Claims

claims

1 . Injection valve (1) for internal combustion engines, with a valve longitudinal axis (2), with a fixed valve seat (29) having valve seat body (16) with a valve seat (29) cooperating valve closing body (7) along the valve longitudinal axis (2) axially movable is, and with a downstream of the valve seat body (16) arranged perforated disc (23) with at least one injection hole pair of two spike holes (24) each having a spray hole axis (S), the injection hole axes (S) of the two injection holes (24) of a spray hole pair to achieve a beam collision converge towards each other,

characterized in that between an outlet opening (27) of the

Valve seat body (16) and the perforated disc (23) a Anströmhohlraum (26) is provided, wherein the Anströmhohlraum (26) has a cavity diameter (D26) perpendicular to the valve longitudinal axis (2) which is greater than an exit diameter (D27) of the outlet opening ( 27) perpendicular to the valve longitudinal axis (2).

2. Injection valve according to claim 1, characterized in that the quotient of the cavity diameter (D26) of the Anströmhohlraums (26) and the outlet diameter (D27) of the outlet opening between 1, 5 and 5 amounts.

3. Injection valve according to one of the preceding claims, characterized in that the quotient of a distance (B24) of the two injection hole pair forming injection holes (24) and the outlet diameter (D27) is between 0.5 and 5. 4. Injection valve according to one of the preceding claims, characterized in that the quotient of a hole length (L24) of the injection holes (24) and a

Hole diameter (D24) of the spray holes (24) is between 0.5 and 5.

5. Injection valve according to one of the preceding claims, characterized in that the quotient of the hole length (L24) of the injection holes (24) and a cavity height

(H26) of the Anströmhohlraums (26) is between 0.25 and 5.

6. Injection valve according to one of the preceding claims, characterized in that a hole inclination (LN), which denotes the angle between the valve longitudinal axis (2) and a spray hole axis (S) is between 10 degrees and 60 degrees.

7. Injection valve according to one of the preceding claims, characterized in that the valve seat body (16) is formed rotationally symmetrical to the valve longitudinal axis (2). 8. Injection valve according to one of the preceding claims, characterized in that the perforated disc (23) symmetrically with respect to at least one of the

Valve longitudinal axis (2) extending plane is.

9. Injection valve according to one of the preceding claims, characterized in that the Anströmhohlraum (26) is cylindrical, wherein the valve longitudinal axis

(2) forms the longitudinal axis of the cylindrical Anströmhohlraums (26).

10. Injection valve according to one of the preceding claims, characterized in that the injection holes (24) are cylindrical.